Document:

EX-10.18.6.1

 Exhibit 10.18.6.1 

NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Campbell Family Trust
(the “Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 

AGREEMENT 

1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 13,137 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ Ian Campbell Ann Campbell
	Name:	 	Campbell Family Trust
	Title:	 	Co-Trustees

 SCHEDULE A 

SCHEDULE OF NOTES 
  

											
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	 	  	PRINCIPAL
AMOUNT
OUTSTANDING	 
	 Campbell Family Trust
	  	Secured Convertible Promissory Note	  	 	10/2/11	  	  	$	7,093.87	  

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Bruce E. Gerhardt (the
“Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 52,699 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ Bruce Gerhardt
	Name:	 	Bruce E. Gerhardt

 SCHEDULE A 

SCHEDULE OF NOTES 
  

							
	 NOTEHOLDER
	  	 TITLE
	  	DATE
ISSUED	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING
	 Bruce E. Gerhardt
	  	Secured Convertible Promissory Note	  	10/7/11	  	$ 28,457.47

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Hale Biopharma
Ventures LLC (the “Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 105,013 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its own
account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing agreement,
arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ David F. Hale
	Name:	 	Hale Biopharma Ventures LLC
	Title:	 	 

 SCHEDULE A 

SCHEDULE OF NOTES 
  

							
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING
	 Hale Biopharma Ventures LLC 
	  	Secured Convertible Promissory Note	  	10/26/11	  	$ 56,706.91

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this “Agreement”) is
made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and MILLENNIUM TRUST
CO., LLC CUSTODIAN FBO IVOR ROYSTON IRA (the “Noteholder”). 

RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 204,059 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ Ivor Royston
	Name:	 	MILLENNIUM TRUST CO., LLC CUSTODIAN FBO IVOR ROYSTON IRA

 SCHEDULE A 

SCHEDULE OF NOTES 
  

							
	 NOTEHOLDER
	  	 TITLE
	  	DATE
ISSUED	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING
	 Millennium Trust Co., LLC Custodian FBO

IVOR ROYSTON IRA
	  	Secured Convertible Promissory Note	  	3/21/12	  	$ 110,191.75

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Edward Neff (the
“Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 52,699 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ Edward Neff
	Name:	 	Edward Neff

 SCHEDULE A 

SCHEDULE OF NOTES 
  

							
	 NOTEHOLDER
	  	 TITLE
	  	DATE
ISSUED	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING
	 Edward Neff 
	  	Secured Convertible Promissory Note	  	10/7/11	  	$ 28,457.47

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Systems, Machine
Automation Components (the “Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 1,116,498 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ Edward Neff
	Name:	 	Systems, Machine Automation Components
	Title:	 	President

 SCHEDULE A 

SCHEDULE OF NOTES 
  

							
	 NOTEHOLDER
	  	 TITLE
	  	DATE
ISSUED	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	10/7/11	  	$ 85,372.60
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	12/14/11	  	$56,169.92
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	1/3/12	  	$55,950.74
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	2/14/12	  	$55,490.46
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	3/5/12	  	$55,271.28
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	6/21/12	  	$54,087.71
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	7/2/12	  	$53,967.16
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	7/13/12	  	$53,846.61
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	7/30/12	  	$53,660.31
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	9/11/12	  	$26,594.49
	 Systems, Machine Automation Components 
	  	Secured Convertible Promissory Note	  	11/13/12	  	$52,498.65

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and J.T.A. van de Ven (the
“Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 10,540 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ J.T.A. van de Ven
	Name:	 	J.T.A. van de Ven

 SCHEDULE A 

SCHEDULE OF NOTES 
  

											
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	 	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING	 
	 J.T.A. van de Ven
	  	Secured Convertible Promissory Note	  	 	10/7/11	  	  	$	 5,691.49	  

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Wilson Boyles &
Co. (the “Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 26,897 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ M. Faye Wilson
	Name:	 	Wilson Boyles & Co.
	Title:	 	 

 SCHEDULE A 

SCHEDULE OF NOTES 
  

											
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	 	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING	 
	 Wilson Boyles & Co.
	  	Secured Convertible Promissory Note	  	 	10/3/11	  	  	$	 14,524.55	  

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and M. Faye Wilson (the
“Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 125,983 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ M. Faye Wilson
	Name:	 	M. Faye Wilson

 SCHEDULE A 

SCHEDULE OF NOTES 
  

											
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	 	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING	 
	 M. Faye Wilson
	  	Secured Convertible Promissory Note	  	 	10/3/11	  	  	$	14,183.92	  
	 M. Faye Wilson IRA
	  	Secured Convertible Promissory Note	  	 	7/13/12	  	  	$	53,846.61	  

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Joseph O. Wong and
Vivian Lim (the “Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase Agreement, dated
as of February 1, 2011, as amended (the “Bridge Financing Agreement”), pursuant to which the Company issued and sold to the Noteholder the secured convertible promissory notes set forth on SCHEDULE
A hereto (each a “Note” and collectively, the “Notes”); 

WHEREAS, in connection with the execution of the Bridge Financing Agreement, the Company and the
Noteholder entered into that certain Subordinated Security Agreement (the “Subordinated Security Agreement”), pursuant to which the Company granted the Noteholder a security interest in certain assets of the Company as
described in the Subordinated Security Agreement; and 
 WHEREAS, the Company and the Noteholder now desire to convert
the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and after
such conversion, the Notes and the Subordinated Security Agreement shall be cancelled. 
 NOW,
THEREFORE, in contemplation of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency
of which the hereby acknowledged, and intending to be legally bound hereby, the parties agree as follows: 
 AGREEMENT

 1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 527,397 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 

 2. Subordinated Security Agreement. Effective immediately, the Subordinated Security Agreement shall be
terminated, and no party shall have any further obligations or commitments with respect thereto, and the security interests granted in and all liens created by the Subordinated Security Agreement shall be discharged and released in full. 

3. Noteholder Representations. The Noteholder hereby represents and warrants to the Company as follows: 

(a) The Noteholder is the sole beneficial owner of the Notes held by it as indicated on SCHEDULE A hereto and the
Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any such Note or any interest therein, other than in connection
with the cancellation of the Notes as contemplated herein. 
 (b) The Noteholder is acquiring the Conversion Shares solely for its
own account for investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing
agreement, arrangement or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 

  
 2 

 4. Market Stand-Off Agreement. The Noteholder hereby agrees that the Noteholder shall not sell, transfer,
make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the Company held by the Noteholder (other than those
included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered under the Securities Act (or such longer period as
the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day period following the effective date of a
registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar
rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and have entered into similar agreements. The obligations described in this Section 4 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the
future. 
 5. Miscellaneous. 
 5.1
Governing Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within
California, without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this
Agreement, shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

5.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 5.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 5.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

  
 3 

 5.5 Severability. In the event one or more of the provisions of this Agreement should, for
any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or
unenforceable provision had never been contained herein. 
 5.6 Entire Agreement. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth
herein. 
 [SIGNATURE PAGE IMMEDIATELY
FOLLOWS] 

  
 4 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ Joseph O. Wong
	Name:	 	Joseph O. Wong

  

			
		
	By:	 	/s/ Vivian Lim
	Name:	 	Vivian Lim

 SCHEDULE A 

SCHEDULE OF NOTES 
  

											
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	 	  	PRINCIPAL
AMOUNT AND
INTEREST
OUTSTANDING	 
	 Joseph O. Wong and Vivian Lim
	  	Secured Convertible Promissory Note	  	 	10/3/11	  	  	$	 284,794.13EX-10.19.2.1

 Exhibit 10.19.2.1 

NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Bruce E. Gerhardt (the
“Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase
Agreement, dated as of January 13, 2012, as amended, pursuant to which the Company issued and sold to the Noteholder the promissory notes set forth on SCHEDULE A hereto (each a “Note” and
collectively, the “Notes”); and 
 WHEREAS, the Company and the Noteholder now desire to
convert the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and
after such conversion, the Notes shall be cancelled. 
 NOW, THEREFORE, in contemplation
of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency of which the hereby acknowledged, and intending to be legally
bound hereby, the parties agree as follows: 
 AGREEMENT 

1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 62,385 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 
 2. Noteholder Representations. The Noteholder hereby
represents and warrants to the Company as follows: 
 (a) The Noteholder is the sole beneficial owner of the Notes held by it as
indicated on SCHEDULE A hereto and the Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any
such Note or any interest therein, other than in connection with the cancellation of the Notes as contemplated herein. 

 (b) The Noteholder is acquiring the Conversion Shares solely for its own account for
investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing agreement, arrangement
or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 
 3. Market Stand-Off Agreement. The Noteholder hereby agrees
that the Noteholder shall not sell, transfer, make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the
Company held by the Noteholder (other than those included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered
under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day
period following the effective date of a registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE
Member Rule 472 or any successor or similar rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and 

  
 2 

 
have entered into similar agreements. The obligations described in this Section 3 shall not apply to a registration relating solely to employee benefit plans on Form S-1 or Form S-8 or
similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the future. 

4. Miscellaneous. 
 4.1 Governing
Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within California,
without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this Agreement,
shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

4.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 4.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 4.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

4.5 Severability. In the event one or more of the provisions of this Agreement should, for any reason, be held to be invalid, illegal
or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or unenforceable provision had never been
contained herein. 
 4.6 Entire Agreement. This Agreement constitutes the full and entire understanding and agreement between
the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth herein. 

  
 3 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ Bruce E. Gerhardt
	Name:	 	Bruce E. Gerhardt

 SCHEDULE A 

SCHEDULE OF NOTES 
  

											
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	 	  	PRINCIPAL AND
INTEREST
AMOUNT
OUTSTANDING	 
	 Bruce E. Gerhardt
	  	Promissory Note	  	 	2/21/12	  	  	$	22,706.80	  
	 Bruce E. Gerhardt
	  	Promissory Note	  	 	7/6/12	  	  	$	10,980.80	  

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and Hale Biopharma Ventures
LLC (the “Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase
Agreement, dated as of January 13, 2012, as amended, pursuant to which the Company issued and sold to the Noteholder the promissory notes set forth on SCHEDULE A hereto (each a “Note” and
collectively, the “Notes”); and 
 WHEREAS, the Company and the Noteholder now desire to
convert the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and
after such conversion, the Notes shall be cancelled. 
 NOW, THEREFORE, in contemplation
of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency of which the hereby acknowledged, and intending to be legally
bound hereby, the parties agree as follows: 
 AGREEMENT 

1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 205,379 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 
 2. Noteholder Representations. The Noteholder hereby
represents and warrants to the Company as follows: 
 (a) The Noteholder is the sole beneficial owner of the Notes held by it as
indicated on SCHEDULE A hereto and the Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any
such Note or any interest therein, other than in connection with the cancellation of the Notes as contemplated herein. 

 (b) The Noteholder is acquiring the Conversion Shares solely for its own account for
investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing agreement, arrangement
or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 
 3. Market Stand-Off Agreement. The Noteholder hereby agrees
that the Noteholder shall not sell, transfer, make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the
Company held by the Noteholder (other than those included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered
under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day
period following the effective date of a registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE
Member Rule 472 or any successor or similar rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and 

  
 2 

 
have entered into similar agreements. The obligations described in this Section 3 shall not apply to a registration relating solely to employee benefit plans on Form S-1 or Form S-8 or
similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the future. 

4. Miscellaneous. 
 4.1 Governing
Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within California,
without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this Agreement,
shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

4.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 4.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 4.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

4.5 Severability. In the event one or more of the provisions of this Agreement should, for any reason, be held to be invalid, illegal
or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or unenforceable provision had never been
contained herein. 
 4.6 Entire Agreement. This Agreement constitutes the full and entire understanding and agreement between
the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth herein. 

  
 3 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ David F. Hale
	Name:	 	Hale Biopharma Ventures LLC
	Title:	 	 

 SCHEDULE A 

SCHEDULE OF NOTES 
  

											
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	 	  	PRINCIPAL AND
INTEREST
AMOUNT
OUTSTANDING	 
	 Hale Biopharma Ventures LLC
	  	Promissory Note	  	 	3/16/12	  	  	$	56,438.38	  
	 Hale Biopharma Ventures LLC
	  	Promissory Note	  	 	8/7/12	  	  	$	54,465.77	  

 NOTE CONVERSION AGREEMENT 

THIS NOTE CONVERSION AGREEMENT (this
“Agreement”) is made and entered into as of June 28, 2013, by and between BIOCEPT, INC., a California corporation (the “Company”), and M. Faye Wilson (the
“Noteholder”). 
 RECITALS 

WHEREAS, the Company and the Noteholder previously entered into that certain Note and Warrant Purchase
Agreement, dated as of January 13, 2012, as amended, pursuant to which the Company issued and sold to the Noteholder the promissory notes set forth on SCHEDULE A hereto (each a “Note” and
collectively, the “Notes”); and 
 WHEREAS, the Company and the Noteholder now desire to
convert the entire unpaid principal and accrued interest outstanding under the Notes into shares of Series A Preferred Stock of the Company (“Series A Preferred”) on the terms and conditions set forth in this Agreement, and
after such conversion, the Notes shall be cancelled. 
 NOW, THEREFORE, in contemplation
of the foregoing and in consideration of the mutual agreements, covenants, representations and warranties contained herein, and for other valid consideration, the receipt and sufficiency of which the hereby acknowledged, and intending to be legally
bound hereby, the parties agree as follows: 
 AGREEMENT 

1. Conversion of Notes. Effective immediately, the entire unpaid principal and accrued interest outstanding under the Notes (the
“Outstanding Balance”) shall be automatically converted into an aggregate of 41,979 shares of Series A Preferred (the “Conversion Shares”). The parties hereto agree that upon such conversion of the
Outstanding Balance, all amounts owed under the Notes shall be deemed paid in full, the Notes shall be terminated and cancelled in full, and no party shall have any further obligations or commitments with respect thereto except as expressly provided
for under this Agreement. Promptly following the date hereof (i) the Noteholder agrees to return to the Company for cancellation the original Notes held by the Noteholder and (ii) the Company shall issue to the Noteholder the Conversion
Shares. Other than the Noteholder’s right to receive the Conversion Shares, the Noteholder hereby waives any and all demands, claims, suits, actions, causes of action, proceedings, assessments and rights in respect of the Notes, including,
without limitation, any rights arising from any default or event of default under the Notes. 
 2. Noteholder Representations. The Noteholder hereby
represents and warrants to the Company as follows: 
 (a) The Noteholder is the sole beneficial owner of the Notes held by it as
indicated on SCHEDULE A hereto and the Noteholder has not sold, assigned, transferred, endorsed, deposited under any agreement, hypothecated, pledged for any bank or brokerage loan or otherwise, or disposed of in any manner any
such Note or any interest therein, other than in connection with the cancellation of the Notes as contemplated herein. 

 (b) The Noteholder is acquiring the Conversion Shares solely for its own account for
investment purposes only and not with a view to any sale or distribution thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). The Noteholder has no pre-existing agreement, arrangement
or understanding, formal or informal, with any person to sell, distribute or transfer all or any part of such Conversion Shares. 

(c) The Noteholder understands that (i) the Conversion Shares have not been registered under the Securities Act or any state
securities law by reason of their issuance in a transaction which is exempt from the registration requirements of the Securities Act and state securities laws, and that such securities must be held indefinitely unless they are subsequently
registered under the Securities Act and such laws or a subsequent disposition thereof is exempt from registration under the applicable provisions of the Securities Act and such laws and (ii) the certificates evidencing such securities will
contain a legend to the foregoing effect. 
 (d) The Noteholder has sufficient knowledge and expertise in business and financial
matters so as to enable it to analyze and evaluate the merits and risks of acquiring the Conversion Shares pursuant to the terms of this Agreement. 

(e) The Noteholder is an accredited investor within the meaning of Regulation D under the Securities Act. 

(f) The Noteholder has had an opportunity to discuss the Company’s business, management and financial affairs with directors,
officers and management of the Company and has had the opportunity to review the Company’s operations and facilities. The Noteholder has also had the opportunity to ask questions of and receive answers from, the Company and its management
regarding the terms and conditions of this investment. 
 (g) The Noteholder has the requisite power and authority to enter into this
Agreement and to agree to the conversion of the Notes held by it under this Agreement. 
 3. Market Stand-Off Agreement. The Noteholder hereby agrees
that the Noteholder shall not sell, transfer, make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock (or other securities) of the
Company held by the Noteholder (other than those included in the registration) during (i) the 180-day period following the effective date of the Company’s first firm commitment underwritten public offering of its Common Stock registered
under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE Member Rule 472 or any successor or similar rule or regulation), and (ii) the 90-day
period following the effective date of a registration statement of the Company filed under the Securities Act (or such longer period as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711 or NYSE
Member Rule 472 or any successor or similar rule or regulation); provided, that, with respect to (i) and (ii) above, all officers and directors of the Company are bound by and 

  
 2 

 
have entered into similar agreements. The obligations described in this Section 3 shall not apply to a registration relating solely to employee benefit plans on Form S-1 or Form S-8 or
similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the future. 

4. Miscellaneous. 
 4.1 Governing
Law. This Agreement shall be governed by and construed under the laws of the State of California in all respects as such laws are applied to agreements among California residents entered into and to be performed entirely within California,
without reference to conflicts of laws or principles thereof. The parties agree that any action brought by either party under or in relation to this Agreement, including without limitation to interpret or enforce any provision of this Agreement,
shall be brought in, and each party agrees to and does hereby submit to the jurisdiction and venue of, any state or federal court located in the County of San Diego, California. 

4.2 Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all
of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 
 4.3
Further Assurances. Each party hereto agrees to execute and deliver, or cause to be executed and delivered, such further instruments or documents or take such other actions as may be reasonably necessary to consummate the transactions
contemplated by this Agreement. 
 4.4 Successors and Assigns. Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon the parties hereto and their respective successors, assigns, heirs, executors and administrators and shall inure to the benefit of and be enforceable by each person who shall be a holder of
the Conversion Shares from time to time; provided, however, that prior to the receipt by the Company of adequate written notice of the transfer of any Conversion Shares specifying the full name and address of the transferee, the
Company may deem and treat the person listed as the holder of such Conversion Shares in its records as the absolute owner and holder of such Conversion Shares for all purposes. 

4.5 Severability. In the event one or more of the provisions of this Agreement should, for any reason, be held to be invalid, illegal
or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Agreement, and this Agreement shall be construed as if such invalid, illegal or unenforceable provision had never been
contained herein. 
 4.6 Entire Agreement. This Agreement constitutes the full and entire understanding and agreement between
the parties with regard to the subjects hereof and no party shall be liable or bound to any other in any manner by any representations, warranties, covenants and agreements except as specifically set forth herein. 

  
 3 

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	COMPANY:
	
	BIOCEPT, INC. 
		
	By:	 	/s/ W G Kachioff
	Name:	 	William Kachioff
	Title:	 	CFO

 IN WITNESS WHEREOF, the
parties have executed this NOTE CONVERSION AGREEMENT as of the date first written above. 
  

			
	NOTEHOLDER:
		
	By:	 	/s/ M. Faye Wilson
	Name:	 	M. Faye Wilson

 SCHEDULE A 

SCHEDULE OF NOTES 
  

											
	 NOTEHOLDER
	  	 TITLE
	  	DATE ISSUED	 	  	PRINCIPAL AND
INTEREST
AMOUNT
OUTSTANDING	 
	 M. Faye Wilson
	  	Promissory Note	  	 	3/1/12	  	  	$	22,668.44

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00223-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00223-of-00352.parquet"}]]