EX-10.10





 Exhibit 10.10 

LOAN AND SECURITY AGREEMENT 

THIS LOAN AND SECURITY AGREEMENT (this “Agreement”) dated as of November 8, 2019 (the “Effective
Date”) by and among (a) SILICON VALLEY BANK, a California corporation with a loan production office located at 275 Grove Street, Suite 2-200, Newton, Massachusetts 02466
(“Bank”), and (b) PANDION THERAPEUTICS, INC., a Delaware corporation (“Borrower”), provides the terms on which Bank shall lend to Borrower and Borrower shall repay Bank. The parties agree as follows:

 1. ACCOUNTING AND OTHER TERMS 

Accounting terms not defined in this Agreement shall be construed following GAAP. Calculations and determinations must be made following GAAP.
Capitalized terms not otherwise defined in this Agreement shall have the meanings set forth in Section 13. All other terms contained in this Agreement, unless otherwise indicated, shall have the meaning provided by the Code to the extent such
terms are defined therein. 
 2. LOAN AND TERMS OF PAYMENT 

2.1 Promise to Pay. Borrower hereby unconditionally promises to pay Bank the outstanding principal amount of all Credit
Extensions and accrued and unpaid interest thereon as and when due in accordance with this Agreement. 
 2.1.1 Term Loan Advances.

 (a) Availability. Subject to the terms and conditions of this Agreement, upon Borrower’s request, on or about the
Effective Date, Bank shall make one (1) term loan advance (the “Term A Loan Advance”) available to Borrower in an original principal amount of Two Million Dollars ($2,000,000.00). Subject to the terms and conditions of this
Agreement, upon Borrower’s request, during Draw Period B, Bank shall make one (1) term loan advance (the “Term B Loan Advance”) available to Borrower in an original principal amount of Four Million Dollars ($4,000,000.00).
Subject to the terms and conditions of this Agreement, upon Borrower’s request, during Draw Period C, Bank shall make one (1) term loan advance (the “Term C Loan Advance”) available to Borrower in an original principal
amount of Four Million Dollars ($4,000,000.00). The Term A Loan Advance, the Term B Loan Advance, and the Term C Loan Advance are each hereinafter referred to singly as a “Term Loan Advance” and collectively as the “Term
Loan Advances”. After repayment, no Term Loan Advance (or any portion thereof) may be reborrowed. 
 (b) Interest Period.
Commencing on the first (1st) Payment Date of the month following the month in which the Funding Date of the applicable Term Loan Advance occurs, and continuing on each Payment Date thereafter,
Borrower shall make monthly payments of interest on the principal amount of each Term Loan Advance at the rate set forth in Section 2.2(a). 

(c) Repayment. Commencing on June 1, 2021, and continuing on each Payment Date thereafter, Borrower shall repay the Term Loan
Advances in (i) thirty (30) consecutive equal monthly installments of principal, plus (ii) monthly payments of accrued interest at the rate set forth in Section 2.2(a). All outstanding principal and accrued and unpaid interest with
respect to the Term Loan Advances, and all other outstanding Obligations with respect to the Term Loan Advances, are due and payable in full on the Term Loan Maturity Date. 

(d) Mandatory Prepayment Upon an Acceleration. If the Term Loan Advances are accelerated following the occurrence of an Event of
Default, Borrower shall immediately pay to Bank an amount equal to the sum of: (i) all outstanding principal plus accrued and unpaid interest, plus (ii) the Prepayment Fee, (iii) the Final Payment, and (iv) all other sums, if
any, that shall have become due and payable, including interest at the Default Rate with respect to any past due amounts. 












 (e) Permitted Prepayment of Term Loan Advances. Borrower shall have the option to
prepay all, but not less than all, the Term Loan Advances advanced by Bank under this Agreement, provided Borrower (i) provides written notice to Bank of its election to prepay the Term Loan Advances at least ten (10) days prior to such
prepayment (or such shorter period as Bank may agree in its sole discretion), and (ii) pays, on the date of such prepayment (A) all outstanding principal plus accrued and unpaid interest, (B) the Prepayment Fee, (C) the Final
Payment, and (D) all other sums, if any, that shall have become due and payable, including interest at the Default Rate with respect to any past due amounts. 

2.2 Payment of Interest on the Credit Extensions. 

(a) Interest Rate. Subject to Section 2.2(b), the principal amount outstanding under each Term Loan Advance shall accrue interest
at a floating per annum rate equal to the greater of (i) the Prime Rate minus one percent (1.0%) and (ii) four and one-quarter of one percent (4.25%), which interest, in each case, shall be payable
monthly in accordance with Section 2.2(d) below. 
 (b) Default Rate. Immediately upon the occurrence and during the continuance
of an Event of Default, Obligations shall bear interest at a rate per annum which is five percent (5.0%) above the rate that is otherwise applicable thereto (the “Default Rate”) unless Bank otherwise elects from time to time in its
sole discretion to impose a smaller increase. Fees and expenses which are required to be paid by Borrower pursuant to the Loan Documents (including, without limitation, Bank Expenses) but are not paid when due shall bear interest until paid at a
rate equal to the highest rate applicable to the Obligations. Payment or acceptance of the increased interest rate provided in this Section 2.2(b) is not a permitted alternative to timely payment and shall not constitute a waiver of any Event
of Default or otherwise prejudice or limit any rights or remedies of Bank. 
 (c) Adjustment to Interest Rate. Changes to the
interest rate of any Credit Extension based on changes to the Prime Rate shall be effective on the effective date of any change to the Prime Rate and to the extent of any such change. 

(d) Payment; Interest Computation. Interest is payable monthly on the Payment Date and shall be computed on the basis of a 360-day year for the actual number of days elapsed. In computing interest, (i) all payments received after 2:00 p.m. Eastern time on any day shall be deemed received at the opening of business on the next
Business Day, and (ii) the date of the making of any Credit Extension shall be included and the date of payment shall be excluded; provided, however, that if any Credit Extension is repaid on the same day on which it is made, such day shall be
included in computing interest on such Credit Extension. 
 2.3 Fees. Borrower shall pay to Bank: 

(a) Prepayment Fee. The Prepayment Fee, if and when due hereunder; 

(b) Final Payment. The Final Payment, when due hereunder; and 

(c) Bank Expenses. All Bank Expenses (including reasonable and documented attorneys’ fees and out-of-pocket expenses for documentation and negotiation of this Agreement) incurred through and after the Effective Date, when due (or, if no stated due date, upon demand by Bank). 

Unless otherwise provided in this Agreement or in a separate writing by Bank, Borrower shall not be entitled to any credit, rebate, or
repayment of any fees earned by Bank pursuant to this Agreement notwithstanding any termination of this Agreement or the suspension or termination of Bank’s obligation to make loans and advances hereunder. Bank may deduct amounts owing by
Borrower under the clauses of this Section 2.3 pursuant to the terms of Section 2.4(c). Bank shall provide Borrower written notice of deductions made from the Designated Deposit Account pursuant to the terms of the clauses of this
Section 2.3. 
 2.4 Payments; Application of Payments; Debit of Accounts. 

(a) All payments to be made by Borrower under any Loan Document shall be made in immediately available funds in Dollars, without setoff or
counterclaim, before 2:00 p.m. Eastern time on the date when due. Payments of principal and/or interest received after 2:00 p.m. Eastern time are considered received at the opening of business on the next Business Day. When a payment is due on a day
that is not a Business Day, the payment shall be due the next Business Day, and additional fees or interest, as applicable, shall continue to accrue until paid. 

  
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 (b) Bank has the exclusive right to determine the order and manner in which all payments
with respect to the Obligations may be applied. Borrower shall have no right to specify the order or the accounts to which Bank shall allocate or apply any payments required to be made by Borrower to Bank or otherwise received by Bank under this
Agreement when any such allocation or application is not specified elsewhere in this Agreement. 
 (c) Bank may debit the Designated Deposit
Account and, to the extent sufficient funds are not present in the Designated Deposit Account at the time of such debit, or if an Event of Default has occurred and is continuing, any other account of Borrower maintained with Bank, for principal and
interest payments or any other amounts Borrower owes Bank when due. These debits shall not constitute a set-off. 

2.5 Withholding. 
 (a)
Payments received by Bank from Borrower under this Agreement will be made free and clear of and without deduction for any and all present or future taxes, levies, imposts, duties, deductions, withholdings, assessments, fees or other charges imposed
by any Governmental Authority (including any interest, additions to tax or penalties applicable thereto). Specifically, however, if at any time any Governmental Authority, applicable law, regulation or international agreement requires Borrower to
make any withholding or deduction from any such payment or other sum payable hereunder to Bank, Borrower hereby covenants and agrees that the amount due from Borrower with respect to such payment or other sum payable hereunder will be increased to
the extent necessary to ensure that, after the making of such required withholding or deduction, Bank receives a net sum equal to the sum which it would have received had no withholding or deduction been required, and Borrower shall pay the full
amount withheld or deducted to the relevant Governmental Authority. Borrower will, upon request, furnish Bank with proof reasonably satisfactory to Bank indicating that Borrower has made such withholding payment; provided, however, that Borrower
need not make any withholding payment if the amount or validity of such withholding payment is contested in good faith by appropriate and timely proceedings and as to which payment in full is bonded or reserved against by Borrower. The agreements
and obligations of Borrower contained in this Section 2.5 shall survive the termination of this Agreement. 
 (b) If any assignee of
Bank’s rights under Section 12.2 of this Agreement is not a “United States Person” as defined in Section 7701(a)(30) of the Internal Revenue Code of 1986, as amended from time to time (such assignee, a “Non-U.S. Lender”), such Non-U.S. Lender shall, upon becoming party to this Agreement, to the extent that such Non-U.S. Lender
is entitled to an exemption from U.S. withholding tax on interest, deliver to Borrower a complete and properly executed IRS Form W-8BEN, W-8ECI or W-8IMY, as appropriate, or any successor form prescribed by the IRS, certifying that such Non-U.S. Lender is entitled to such exemption from U.S. withholding tax on interest.
Notwithstanding Section 2.5(a) above, Borrower shall not be required to pay any additional amount to any Non-U.S. Lender under Section 2.5(a) if such Non-U.S.
Lender fails or is unable to deliver the forms, certificates or other evidence described in the preceding sentence, unless such Non-U.S. Lender’s failure or inability to deliver such forms is the result
of any change in any applicable law, treaty or governmental rule, or any change in the interpretation thereof after such Non-U.S. Lender became a party to this Agreement. 

3. CONDITIONS OF LOANS 

3.1 Conditions Precedent to Initial Credit Extension. Bank’s obligation to make the initial Credit Extension is subject to
the condition precedent that Bank shall have received, in form and substance satisfactory to Bank, such documents, and completion of such other matters, as Bank may reasonably deem necessary or appropriate, including, without limitation: 

(a) duly executed signatures to the Loan Documents; 

(b) duly executed original signatures to the Warrant; 

  
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 (c) duly executed signatures to the Control Agreement, if any; 

(d) the Operating Documents and long-form good standing certificates of Borrower certified by the Secretary of State of Delaware and each
other jurisdiction in which Borrower is qualified to conduct business, each as of a date no earlier than thirty (30) days prior to the Effective Date; 

(e) duly executed signatures to the completed Borrowing Resolutions for Borrower; 

(f) duly executed signatures to the completed Borrowing Resolutions for Guarantor; 

(g) certified copies, dated as of a recent date, of financing statement searches, as Bank may request, accompanied by written evidence
(including any UCC termination statements) that the Liens indicated in any such financing statements either constitute Permitted Liens or have been or, in connection with the initial Credit Extension, will be terminated or released; 

(h) the Perfection Certificate of Borrower, together with the duly executed signature thereto; 

(i) the duly executed signatures to the Guaranty; 

(j) duly executed signatures to the Stock Pledge Agreement; 

(k) stock power forms (5 originals) executed by Guarantor with respect to its capital stock of ProgramCo and delivery of original stock
certificates evidencing ownership interest in ProgramCo; 
 (l) stock power forms (5 originals) executed by Borrower with respect to its
capital stock of Securities Corp. and delivery of stock certificates evidencing ownership interest in Securities Corp.; 
 (m) a
landlord’s consent in favor of Bank for Borrower’s leased location at 610 Main Street, North Cambridge, Massachusetts 02139, by the respective landlord thereof, together with the duly executed signatures thereto; and 

(n) payment of the fees and Bank Expenses then due as specified in Section 2.3 hereof. 

3.2 Conditions Precedent to all Credit Extensions. Bank’s obligations to make each Credit Extension, including the initial
Credit Extension, is subject to the following conditions precedent: 
 (a) except as otherwise provided in Section 3.4, timely receipt
of an executed Payment/Advance Form; 
 (b) the representations and warranties in this Agreement shall be true, accurate, and complete in
all material respects on the date of the Payment/Advance Form and on the Funding Date of each Credit Extension; provided, however, that such materiality qualifier shall not be applicable to any representations and warranties that already are
qualified or modified by materiality in the text thereof; and provided, further that those representations and warranties expressly referring to a specific date shall be true, accurate and complete in all material respects as of such date, and no
Event of Default shall have occurred and be continuing or result from the Credit Extension. Each Credit Extension is Borrower’s representation and warranty on that date that the representations and warranties in this Agreement remain true,
accurate, and complete in all material respects; provided, however, that such materiality qualifier shall not be applicable to any representations and warranties that already are qualified or modified by materiality in the text thereof; and
provided, further that those representations and warranties expressly referring to a specific date shall be true, accurate and complete in all material respects as of such date; and 

(c) Bank determines to its reasonable satisfaction that there has not been any material impairment in the general affairs, management,
results of operation, financial condition or the prospect of repayment of the Obligations, or any material adverse deviation by Borrower from the most recent business plan of Borrower presented to and accepted by Bank. 

  
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 3.3 Covenant to Deliver. Borrower agrees to deliver to Bank each item required
to be delivered to Bank under this Agreement as a condition precedent to any Credit Extension. Borrower expressly agrees that a Credit Extension made prior to the receipt by Bank of any such item shall not constitute a waiver by Bank of
Borrower’s obligation to deliver such item, and the making of any Credit Extension in the absence of a required item shall be in Bank’s sole discretion. 

3.4 Procedures for Borrowing. Subject to the prior satisfaction of all other applicable conditions to the making of a Credit
Extension set forth in this Agreement, to obtain a Credit Extension, Borrower shall notify Bank (which notice shall be irrevocable) by electronic mail, facsimile, or telephone by 2:00 p.m. Eastern time at least two (2) Business Days prior to
the proposed Funding Date of the Credit Extension. Together with any such electronic or facsimile notification, Borrower shall deliver to Bank by electronic mail or facsimile a completed Payment/Advance Form executed by an Authorized Signer. Bank
may rely on any telephone notice given by a person whom Bank reasonably believes is an Authorized Signer. Bank shall credit the Credit Extensions to the Designated Deposit Account. Bank may make Credit Extensions under this Agreement based on
instructions from an Authorized Signer or without instructions if the Credit Extensions are necessary to meet Obligations which have become due. 

4. CREATION OF SECURITY INTEREST 

4.1 Grant of Security Interest. Borrower hereby grants Bank, to secure the payment and performance in full of all of the
Obligations, a continuing security interest in, and pledges to Bank, the Collateral, wherever located, whether now owned or hereafter acquired or arising, and all proceeds and products thereof. 

Borrower acknowledges that it previously has entered, and/or may in the future enter, into Bank Services Agreements with Bank. Regardless of
the terms of any Bank Services Agreement, Borrower agrees that any amounts Borrower owes Bank thereunder shall be deemed to be Obligations hereunder and that it is the intent of Borrower and Bank to have all such Obligations secured by the first
priority perfected security interest in the Collateral granted herein (subject only to Permitted Liens that are permitted pursuant to the terms of this Agreement to have superior priority to Bank’s Lien in this Agreement). 

If this Agreement is terminated, Bank’s Lien in the Collateral shall continue until the Obligations (other than inchoate indemnity
obligations, other obligations which by their terms survive the termination of this Agreement, and any Obligations under Bank Services Agreements that are cash collateralized in accordance with Section 4.1 of this Agreement) are repaid in full
in cash. Upon payment in full in cash of the Obligations (other than inchoate indemnity obligations, other obligations which by their terms survive the termination of this Agreement, and any Obligations under Bank Services Agreements that are cash
collateralized in accordance with Section 4.1 of this Agreement) and at such time as Bank’s obligation to make Credit Extensions has terminated, Bank shall, at the sole cost and expense of Borrower, release its Liens in the Collateral and
all rights therein shall revert to Borrower. In the event (x) all Obligations (other than inchoate indemnity obligations, other obligations which by their terms survive the termination of this Agreement, and any Obligations under Bank Services
Agreements that are cash collateralized in accordance with Section 4.1 of this Agreement), except for Bank Services, are satisfied in full, and (y) this Agreement is terminated, Bank shall terminate the security interest granted herein
upon Borrower providing cash collateral acceptable to Bank in its good faith business judgment for Bank Services, if any. In the event such Bank Services consist of outstanding Letters of Credit, Borrower shall provide to Bank cash collateral
in an amount equal to (x) if such Letters of Credit are denominated in Dollars, then at least one hundred five percent (105.0%); and (y) if such Letters of Credit are denominated in a Foreign Currency, then at least one hundred ten percent
(110.0%), of the Dollar Equivalent of the face amount of all such Letters of Credit plus, in each case, all interest, fees, and costs due or to become due in connection therewith (as estimated by Bank in its good faith business judgment), to secure
all of the Obligations relating to such Letters of Credit. 
 4.2 Priority of Security Interest. Borrower represents,
warrants, and covenants that the security interest granted herein is and shall at all times continue to be a first priority perfected security interest in the Collateral (subject only to Permitted Liens that are permitted pursuant to the terms of
this Agreement to have superior priority to Bank’s Lien under this Agreement), other than motor vehicles, vessels, boats, ships and other assets which security interest is only perfected by certificates of title or commercial tort claims
subject to the 

  
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exception set forth in the subsequent sentence. If Borrower shall acquire a commercial tort claim with a value in excess of One Hundred Thousand Dollars ($100,000.00), Borrower shall promptly
notify Bank in a writing signed by Borrower of the general details thereof and grant to Bank in such writing a security interest therein and in the proceeds thereof, all upon the terms of this Agreement, with such writing to be in form and substance
reasonably satisfactory to Bank. 
 4.3 Authorization to File Financing Statements. Borrower hereby authorizes Bank to file
financing statements, without notice to Borrower, with all appropriate jurisdictions to perfect or protect Bank’s interest or rights hereunder, including a notice that any disposition of the Collateral, by Borrower or any other Person, shall be
deemed to violate the rights of Bank under the Code. Such financing statements may indicate the Collateral substantially the same as the Collateral described on Exhibit A, or words of similar effect, or as being of an equal or lesser scope,
or with greater detail, all in Bank’s discretion. 
 5. REPRESENTATIONS AND WARRANTIES 

Borrower represents and warrants as follows: 

5.1 Due Organization, Authorization; Power and Authority. Borrower is duly existing and in good standing as a Registered
Organization in its jurisdiction of formation and is qualified and licensed to do business and is in good standing in any jurisdiction in which the conduct of its business or its ownership of property requires that it be qualified except where the
failure to do so could not reasonably be expected to have a material adverse effect on Borrower’s business. In connection with this Agreement, Borrower has delivered to Bank a completed certificate signed by Borrower, entitled “Perfection
Certificate” (the “Perfection Certificate”) (it being understood and agreed that Borrower may from time to time update certain information in the Perfection Certificate after the Effective Date to the extent such updates are
permitted by one or more specific provisions of this Agreement, and all references in this Agreement to “Perfection Certificate” shall hereinafter be deemed to be a reference to the new Perfection Certificate). Borrower represents and
warrants to Bank that (a) Borrower’s exact legal name is that indicated on the Perfection Certificate and on the signature page hereof; (b) Borrower is an organization of the type and is organized in the jurisdiction set forth in the
Perfection Certificate; (c) the Perfection Certificate accurately sets forth Borrower’s organizational identification number or accurately states that Borrower has none; (d) the Perfection Certificate accurately sets forth
Borrower’s place of business, or, if more than one, its chief executive office as well as Borrower’s mailing address (if different than its chief executive office); (e) Borrower (and each of its predecessors) has not, in the past five
(5) years, changed its jurisdiction of formation, organizational structure or type, or any organizational number assigned by its jurisdiction; and (f) all other information set forth on the Perfection Certificate pertaining to Borrower and
each of its Subsidiaries is accurate and complete in all material respects (it being understood and agreed that Borrower may from time to time update certain information in the Perfection Certificate after the Effective Date (by delivering a new
Perfection Certificate or by disclosing such updates in a Compliance Certificate) to the extent such updates result from actions, transactions, circumstances or events not prohibited by the terms of this Agreement). If any Borrower is not now a
Registered Organization but later becomes one, Borrower shall promptly notify Bank of such occurrence and provide Bank with Borrower’s organizational identification number. 

The execution, delivery and performance by Borrower of the Loan Documents to which it is a party have been duly authorized, and do not
(i) conflict with any of Borrower’s organizational documents, (ii) contravene, conflict with, constitute a default under or violate any material Requirement of Law, (iii) contravene, conflict or violate any applicable order,
writ, judgment, injunction, decree, determination or award of any Governmental Authority by which Borrower or any of its Subsidiaries or any of their property or assets may be bound or affected, (iv) require any action by, filing (other than a
financing statement), registration, or qualification with, or Governmental Approval from, any Governmental Authority (except such Governmental Approvals which have already been obtained and are in full force and effect (or are being obtained
pursuant to Section 6.1(b)) or (v) conflict with, contravene, constitute a default or breach under, or result in or permit the termination or acceleration of, any material agreement by which Borrower is bound. Borrower is not in default
under any agreement to which it is a party or by which it is bound in which the default could reasonably be expected to have a material adverse effect on Borrower’s business. 

  
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 5.2 Collateral. Borrower has good title to, rights in, and the power to
transfer each item of the Collateral upon which it purports to grant a Lien hereunder, free and clear of any and all Liens except Permitted Liens. Borrower has no Collateral Accounts at or with any bank or financial institution other than Bank or
Bank’s Affiliates except for the Collateral Accounts described in the Perfection Certificate delivered to Bank in connection herewith and which Borrower has taken such actions as are necessary to give Bank a perfected security interest therein,
pursuant to the terms of Section 6.6(b). The Accounts are bona fide, existing obligations of the Account Debtors. 
 The Collateral
(excluding any laptops, phones, and similar property held by employees in the ordinary course of business) is not in the possession of any third party bailee (such as a warehouse) except as otherwise provided in the Perfection Certificate or as
permitted pursuant to Section 7.2. None of the components of the Collateral shall be maintained at locations other than as provided in the Perfection Certificate or as otherwise disclosed to Bank in writing pursuant to Section 7.2. 

All Inventory (excluding Experimental Compounds) is in all material respects of good and marketable quality, free from material defects. 

Borrower is the sole owner of the Intellectual Property which it owns or purports to own except for (a) licenses permitted hereunder, (b) over-the-counter software that is commercially available to the public, and (c) material Intellectual Property licensed to Borrower and noted on the Perfection
Certificate or disclosed to Bank in writing pursuant to Section 6.7(b). Each Patent which it owns or purports to own and which is material to Borrower’s business is valid and enforceable, and no part of the Intellectual Property which
Borrower owns or purports to own and which is material to Borrower’s business has, been judged invalid or unenforceable, in whole or in part. To Borrower’s knowledge, no claim has been made that any part of the Intellectual Property
violates the rights of any third party except to the extent such claim would not reasonably be expected to have a material adverse effect on Borrower’s business. 

Except as noted on the Perfection Certificate or as disclosed to Bank in writing pursuant to Section 6.7(b), Borrower is not a party to,
nor is it bound by, any Restricted License. 
 5.3 Litigation. Other than those of which Borrower has notified Bank in writing
pursuant to Section 6.2(h), there are no actions or proceedings pending or, to the knowledge of any Responsible Officer, threatened in writing by or against Borrower or any of its Subsidiaries involving more than, individually or in the
aggregate, One Hundred Fifty Thousand Dollars ($150,000.00). 
 5.4 Financial Statements; Financial Condition. All
consolidated financial statements for Borrower and any of its Subsidiaries delivered to Bank fairly present in all material respects Borrower’s consolidated financial condition and Borrower’s consolidated results of operations (subject to year-end adjustments and the absence of footnotes). There has not been any material deterioration in Borrower’s consolidated financial condition since the date of the most recent financial statements submitted
to Bank. 
 5.5 Solvency. The fair salable value of Borrower’s consolidated assets (including goodwill minus disposition
costs) exceeds the fair value of Borrower’s liabilities; Borrower is not left with unreasonably small capital after the transactions in this Agreement; and Borrower is able to pay its debts (including trade debts) as they mature. 

5.6 Regulatory Compliance. Borrower is not an “investment company” or a company “controlled” by an
“investment company” under the Investment Company Act of 1940, as amended. Borrower is not engaged as one of its important activities in extending credit for margin stock (under Regulations X, T and U of the Federal Reserve Board of
Governors). Borrower (a) has complied in all material respects with all Requirements of Law, and (b) has not violated any Requirements of Law the violation of which could reasonably be expected to have a material adverse effect on its
business. None of Borrower’s or any of its Subsidiaries’ properties or assets has been used by Borrower or any Subsidiary or, to the best of Borrower’s knowledge, by previous Persons, in disposing, producing, storing, treating, or
transporting any hazardous substance other than legally. Borrower and each of its Subsidiaries have obtained all consents, approvals and authorizations of, made all declarations or filings with, and given all notices to, all Governmental Authorities
that are necessary to continue their respective businesses as currently conducted, except to the extent the failure to obtain, make or file the same would not reasonably be expected to have a material adverse effect on Borrower’s business or
operations. 

  
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 5.7 Subsidiaries; Investments. Borrower does not own any stock, partnership,
or other ownership interest or other equity securities except for Permitted Investments. 
 5.8 Tax Returns and Payments; Pension
Contributions. Borrower has timely filed all required tax returns and reports required to be filed by Borrower, and Borrower has timely paid all foreign, federal, state and local taxes, assessments, deposits and contributions owed by Borrower
except (a) to the extent such taxes are being contested in good faith by appropriate proceedings promptly instituted and diligently conducted, so long as such reserve or other appropriate provision, if any, as shall be required in conformity
with GAAP shall have been made therefor, or (b) if such taxes, assessments, deposits and contributions do not, individually or in the aggregate, exceed Twenty-Five Thousand Dollars ($25,000.00). 

To the extent Borrower defers payment of any contested taxes, Borrower shall (i) notify Bank in writing of the commencement of, and any
material development in, the proceedings, and (ii) post bonds or take any other steps required to prevent the Governmental Authority levying such contested taxes from obtaining a Lien upon any of the Collateral that is other than a Permitted
Lien. Borrower is unaware of any claims or adjustments proposed for any of Borrower’s prior tax years which could result in additional taxes becoming due and payable by Borrower in excess of Twenty-Five Thousand Dollars ($25,000.00). Borrower
has paid all amounts necessary to fund all present pension, profit sharing and deferred compensation plans in accordance with their terms, and Borrower has not withdrawn from participation in, and has not permitted partial or complete termination
of, or permitted the occurrence of any other event with respect to, any such plan which could reasonably be expected to result in any liability of Borrower, including any liability to the Pension Benefit Guaranty Corporation or its successors or any
other governmental agency. 
 5.9 Use of Proceeds. Borrower shall use the proceeds of the Credit Extensions as working capital
and to fund its general business requirements and not for personal, family, household or agricultural purposes. 
 5.10 Full
Disclosure. No written representation, warranty or other statement of Borrower in any certificate or written statement given to Bank, as of the date such representation, warranty, or other statement was made, taken together with all such written
certificates and written statements given to Bank, contains any untrue statement of a material fact or omits to state a material fact necessary to make the statements contained in the certificates or statements not misleading in light of the
circumstances under which they were made (it being recognized by Bank that the projections and forecasts provided by Borrower in good faith and based upon reasonable assumptions are not viewed as facts and that actual results during the period or
periods covered by such projections and forecasts may differ from the projected or forecasted results). 
 5.11 Definition of
“Knowledge.” For purposes of the Loan Documents, whenever a representation or warranty is made to Borrower’s knowledge or awareness, to the “best of” Borrower’s knowledge, or with a similar qualification,
knowledge or awareness means the actual knowledge, after reasonable investigation, of any Responsible Officer. 
 6. AFFIRMATIVE
COVENANTS 
 Borrower shall do all of the following: 

6.1 Government Compliance. 

(a) Maintain its and all its Subsidiaries’ legal existence and good standing in their respective jurisdictions of formation and maintain
qualification in each jurisdiction in which the failure to so qualify would reasonably be expected to have a material adverse effect on Borrower’s business or operations. Borrower shall comply, and have each Subsidiary comply, in all material
respects, with all laws, ordinances and regulations to which it is subject. 

  
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 (b) Obtain all of the Governmental Approvals necessary for the performance by Borrower of
its obligations under the Loan Documents to which it is a party and the grant of a security interest to Bank in all of its property. Borrower shall promptly provide copies of any such obtained Governmental Approvals to Bank. 

6.2 Financial Statements, Reports, Certificates. Provide Bank with the following: 

(a) Monthly Financial Statements. As soon as available, but no later than thirty (30) days after the last day of each month, a
company prepared consolidated balance sheet and income statement covering Borrower’s consolidated operations for such month certified by a Responsible Officer and in a form of presentation reasonably acceptable to Bank (the “Monthly
Financial Statements”); 
 (b) Monthly Compliance Certificate. Within thirty (30) days after the last day of each month
and together with the Monthly Financial Statements, a duly completed Compliance Certificate signed by a Responsible Officer, certifying that as of the end of such month, Borrower was in full compliance with all of the terms and conditions of this
Agreement; 
 (c) Board-Approved Projections. At least annually, but within the later to occur of (i) thirty (30) days after the
last day of each fiscal year of Borrower and (ii) thirty (30) days after approval by the Board, and contemporaneously with any updates or changes thereto, annual Board-approved operating budgets and financial projections, in a form of
presentation reasonably acceptable to Bank; 
 (d) Annual Audited Financial Statements. As soon as available, but no later than one
hundred eighty (180) days after the last day of Borrower’s fiscal year (commencing with Borrower’s fiscal year ended December 31, 2018), audited consolidated financial statements prepared under GAAP, consistently applied,
together with an unqualified opinion (other than qualification as to going concern typical for venture backed companies similar to Borrower) on the financial statements from any “Big Four” accounting firm or any other independent certified
public accounting firm reasonably acceptable to Bank; 
 (e) Other Statements. Within five (5) days of delivery, copies of all
material statements, reports and notices made available to Borrower’s security holders or to any holders of Subordinated Debt (solely in their roles as security holders or Subordinated Debt holders and not in any other role); 

(f) SEC Filings. In the event that Borrower becomes subject to the reporting requirements under the Exchange Act within five
(5) days of filing, copies of all periodic and other reports, proxy statements and other materials filed by Borrower and/or any Guarantor with the SEC, any Governmental Authority succeeding to any or all of the functions of the SEC or with any
national securities exchange, or distributed to its shareholders, as the case may be. Documents required to be delivered pursuant to the terms hereof (to the extent any such documents are included in materials otherwise filed with the SEC) may be
delivered electronically and if so delivered, shall be deemed to have been delivered on the date on which Borrower posts such documents, or provides a link thereto, on Borrower’s website on the internet at Borrower’s website address;
provided, however, Borrower shall promptly notify Bank in writing (which may be by electronic mail) of the posting of any such documents; 

(g) Beneficial Ownership Information. Prompt written notice of any changes to the beneficial ownership information set out in
Section 14 of the Perfection Certificate. Borrower understands and acknowledges that Bank relies on such true, accurate and up-to-date beneficial ownership
information to meet Bank’s regulatory obligations to obtain, verify and record information about the beneficial owners of its legal entity customers; 

(h) Legal Action Notice. A prompt report of any legal actions pending or threatened in writing against Borrower or any of its
Subsidiaries that could reasonably be expected to result in damages or costs to Borrower or any of its Subsidiaries of, individually or in the aggregate, One Hundred Fifty Thousand Dollars ($150,000.00) or more; and 

(i) Other Financial Information. Other financial information reasonably requested by Bank. 

  
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 6.3 Inventory; Returns. Keep all Inventory in good and marketable condition,
free from material defects (excluding Experimental Compounds). Returns and allowances between Borrower and its Account Debtors shall follow Borrower’s customary practices as they exist at the Effective Date. Borrower must promptly notify Bank
of all returns, recoveries, disputes and claims that involve more than One Hundred Thousand Dollars ($100,000.00). 
 6.4 Taxes;
Pensions. Timely file, and require each of its Subsidiaries to timely file, all required tax returns and reports and timely pay, and require each of its Subsidiaries to timely pay, all foreign, federal, state and local taxes, assessments,
deposits and contributions owed by Borrower and each of its Subsidiaries, except for (i) any taxes in an amount less than Twenty-Five Thousand Dollars ($25,000.00) or (ii) deferred payment of any taxes contested pursuant to the terms of
Section 5.8 hereof, and shall deliver to Bank, on demand, appropriate certificates attesting to such payments, and pay all amounts necessary to fund all present pension, profit sharing and deferred compensation plans in accordance with their
terms. 
 6.5 Insurance.  

(a) Keep its business and the Collateral insured for risks and in amounts standard for companies in Borrower’s industry and location and
as Bank may reasonably request. Insurance policies shall be in a form, with financially sound and reputable insurance companies that are not Affiliates of Borrower, and in amounts that are reasonably satisfactory to Bank. All property policies shall
have a lender’s loss payable endorsement showing Bank as lender loss payee. All liability policies shall show, or have endorsements showing, Bank as an additional insured. Bank shall be named as lender loss payee and/or additional insured with
respect to any such insurance providing coverage in respect of any Collateral. 
 (b) Ensure that proceeds payable under any property policy
are, at Bank’s option, payable to Bank on account of the Obligations. Notwithstanding the foregoing, (i) so long as no Event of Default has occurred and is continuing, Borrower shall have the option of applying the proceeds of any casualty
policy up to Two Hundred Thousand Dollars ($200,000.00) in the aggregate for all losses under all casualty policies in any one (1) year, toward the replacement or repair of destroyed or damaged property; provided that any such replaced or
repaired property (A) shall be of equal or like value as the replaced or repaired Collateral and (B) shall be deemed Collateral in which Bank has been granted a first priority security interest, and (ii) after the occurrence and
during the continuance of an Event of Default, all proceeds payable under such casualty policy shall, at the option of Bank, be payable to Bank on account of the Obligations. 

(c) At Bank’s request, Borrower shall deliver certified copies of insurance policies and evidence of all premium payments. Each provider
of any such insurance required under this Section 6.5 shall agree, by endorsement upon the policy or policies issued by it or by independent instruments furnished to Bank, that it will give Bank thirty (30) days prior written notice before
any such policy or policies shall be canceled (ten (10) days for nonpayment of premium). If Borrower fails to obtain insurance as required under this Section 6.5 or to pay any amount or furnish any required proof of payment to third
persons and Bank, Bank may make all or part of such payment or obtain such insurance policies required in this Section 6.5, and take any action under the policies Bank deems prudent. 

6.6 Operating Accounts. 

(a) Maintain all of its and all of its Subsidiaries’ (excluding Securities Corp.) operating accounts and excess cash with Bank and
Bank’s Affiliates. In addition to the foregoing, Borrower shall at all times have on deposit in accounts maintained in the name of Borrower with Bank, cash in an amount equal to the lesser of (i) one hundred percent (100.0%) of the Dollar
value of Borrower’s consolidated cash, including any Subsidiaries’, Guarantor’s and ProgramCo’s cash, in the aggregate, at all financial institutions, and (ii) one hundred ten percent (110.0%) of the then-outstanding
Obligations of Borrower to Bank. Bank may restrict withdrawals or transfers by or on behalf of Borrower that would violate this Section 6.6(a), regardless of whether an Event of Default exists at such time. Borrower shall also conduct all of
its primary banking with Bank and Bank’s Affiliates, including, without limitation, letters of credit and business credit cards. Any Guarantor shall maintain all of its operating accounts and its excess cash with Bank and Bank’s
Affiliates. 

  
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 (b) Provide Bank five (5) days prior written notice before establishing any Collateral
Account at or with any bank or financial institution other than Bank or Bank’s Affiliates. For each Collateral Account that Borrower at any time maintains, Borrower shall cause the applicable bank or financial institution (other than Bank) at
or with which any Collateral Account is maintained to execute and deliver a Control Agreement or other appropriate instrument with respect to such Collateral Account to perfect Bank’s Lien in such Collateral Account in accordance with the terms
hereunder which Control Agreement may not be terminated without the prior written consent of Bank. The provisions of the previous sentence shall not apply to deposit accounts exclusively used for payroll, payroll taxes and other employee wage and
benefit payments to or for the benefit of Borrower’s employees and identified to Bank by Borrower as such. 
 6.7 Protection of
Intellectual Property Rights. 
 (a) (i) Use commercially reasonable efforts to protect, defend and maintain the validity and
enforceability of its Intellectual Property material to Borrower’s business; (ii) promptly advise Bank in writing of material infringements or any other event that could reasonably be expected to materially and adversely affect the value
of its Intellectual Property material to Borrower’s business; and (iii) not allow any Intellectual Property material to Borrower’s business to be abandoned, forfeited or dedicated to the public without Bank’s written consent.

 (b) Provide written notice to Bank within ten (10) days (or such shorter period as Bank may agree in its sole discretion) of
entering or becoming bound by any Restricted License (other than over-the-counter software that is commercially available to the public). Borrower shall take such
commercially reasonable steps as Bank reasonably requests to obtain the consent of, or waiver by, any person whose consent or waiver is necessary for (i) any Restricted License to be deemed Collateral and for Bank to have a security interest in
it that might otherwise be restricted or prohibited by law or by the terms of any such Restricted License, whether now existing or entered into in the future, and (ii) Bank to have the ability in the event of a liquidation of any Collateral to
dispose of such Collateral in accordance with Bank’s rights and remedies under this Agreement and the other Loan Documents. 

6.8 Litigation Cooperation. From the date hereof and continuing through the termination of this Agreement, make available to
Bank, without expense to Bank, Borrower and its officers, employees and agents and Borrower’s books and records, to the extent that Bank may deem them reasonably necessary to prosecute or defend any third-party suit or proceeding instituted by
or against Bank with respect to any Collateral or relating to Borrower. 
 6.9 Access to Collateral; Books and Records. Allow
Bank, or its agents, at reasonable times, on five (5) Business Days’ notice (provided no notice is required if an Event of Default has occurred and is continuing), to inspect the Collateral and audit and copy Borrower’s Books. Such
inspections or audits shall be conducted no more often than once every twelve (12) months unless an Event of Default has occurred and is continuing in which case such inspections and audits shall occur as often as Bank shall determine is
necessary. The foregoing inspections and audits shall be at Borrower’s expense, and the charge therefor shall be One Thousand Dollars ($1,000.00) per person per day (or such higher amount as shall represent Bank’s then-current standard
charge for the same), plus reasonable and documented out-of-pocket expenses. In the event Borrower and Bank schedule an audit more than eight (8) days in advance,
and Borrower cancels or seeks to reschedule the audit with less than eight (8) days written notice to Bank, then (without limiting any of Bank’s rights or remedies), Borrower shall pay Bank a fee of Two Thousand Dollars ($2,000.00) plus
any out-of-pocket expenses incurred by Bank to compensate Bank for the anticipated costs and expenses of the cancellation or rescheduling. 

6.10 Further Assurances. Execute any further instruments and take further action as Bank reasonably requests to perfect or
continue Bank’s Lien in the Collateral or to effect the purposes of this Agreement. Deliver to Bank, within five (5) days after the same are sent or received, copies of all correspondence, reports, documents and other filings with
any Governmental Authority regarding compliance with or maintenance of Governmental Approvals or Requirements of Law or that could reasonably be expected to have a material effect on any of the Governmental Approvals or otherwise on the operations
of Borrower or any of its Subsidiaries. 

  
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 6.11 Post-Closing Conditions. Within thirty (30) days of the Effective
Date, Borrower shall deliver to Bank evidence satisfactory to Bank that the insurance policies and endorsements required by Section 6.5 hereof are in full force and effect, together with appropriate evidence showing lender loss payable and/or
additional insured clauses or endorsements in favor of Bank. 
 7. NEGATIVE COVENANTS 

Borrower shall not do any of the following without Bank’s prior written consent: 

7.1 Dispositions. Convey, sell, lease, transfer, assign, or otherwise dispose of (including, without limitation, pursuant to a
Division) (collectively, “Transfer”), or permit any of its Subsidiaries to Transfer, all or any part of its business or property, except for Transfers (a) of Inventory in the ordinary course of business; (b) of worn-out or obsolete Equipment that is, in the reasonable judgment of Borrower, no longer economically practicable to maintain or useful in the ordinary course of business of Borrower; (c) consisting of
Permitted Liens and Permitted Investments; (d) consisting of the sale or issuance of any stock of Borrower permitted under Section 7.2 of this Agreement; (e) consisting of Borrower’s use or transfer of money or Cash Equivalents
in a manner that is not prohibited by the terms of this Agreement or the other Loan Documents; (f) of non-exclusive licenses for the use of the property of Borrower or its Subsidiaries in the ordinary
course of business and exclusive licenses for the use of the property of Borrower or its Subsidiaries in the ordinary course of business that could not result in a legal transfer of title of the licensed property; (g) to Borrower from any of
its Subsidiaries; and (h) of other property not to exceed One Hundred Thousand Dollars ($100,000.00) in the aggregate in any twelve (12) month period. 

7.2 Changes in Business, Management, Control, or Business Locations. (a) Engage in or permit any of its Subsidiaries to engage
in any business other than the businesses currently engaged in by Borrower and such Subsidiary, as applicable, or reasonably related thereto; (b) liquidate or dissolve; (c) fail to provide notice to Bank of any Key Person departing from or
ceasing to be employed by Borrower within ten (10) days after such Key Person’s departure from Borrower; or (d) permit or suffer any Change in Control. 

Borrower shall not, without at least ten (10) days prior written notice to Bank: (1) add any new offices or business locations,
including warehouses (unless such new offices or business locations contain less than One Hundred Fifty Thousand Dollars ($150,000.00) in Borrower’s assets or property) or deliver any portion of the Collateral valued, individually or in the
aggregate, in excess of One Hundred Fifty Thousand Dollars ($150,000.00) to a bailee at a location other than to a bailee and at a location already disclosed in the Perfection Certificate, (2) change its jurisdiction of organization,
(3) change its organizational structure or type, (4) change its legal name, or (5) change any organizational number (if any) assigned by its jurisdiction of organization. If Borrower intends to add any new offices or business
locations, including warehouses, containing in excess of One Hundred Fifty Thousand Dollars ($150,000.00) of Borrower’s assets or property, then Borrower will cause the landlord of any such new offices or business locations, including
warehouses, to execute and deliver a landlord consent in form and substance reasonably satisfactory to Bank. If Borrower intends to deliver any portion of the Collateral valued, individually or in the aggregate, in excess of One Hundred Fifty
Thousand Dollars ($150,000.00) to a bailee, and Bank and such bailee are not already parties to a bailee agreement governing both the Collateral and the location to which Borrower intends to deliver the Collateral, then Borrower will cause such
bailee to execute and deliver a bailee agreement in form and substance reasonably satisfactory to Bank. 
 7.3 Mergers or
Acquisitions. Merge or consolidate, or permit any of its Subsidiaries to merge or consolidate, with any other Person, or acquire, or permit any of its Subsidiaries to acquire, all or substantially all of the capital stock or property of another
Person (including, without limitation, by the formation of any Subsidiary or pursuant to a Division). A Subsidiary may merge or consolidate into another Subsidiary or into Borrower. 

7.4 Indebtedness. Create, incur, assume, or be liable for any Indebtedness, or permit any Subsidiary to do so, other than
Permitted Indebtedness. 
 7.5 Encumbrance. Create, incur, allow, or suffer any Lien on any of its property, or assign or
convey any right to receive income, including the sale of any Accounts, or permit any of its Subsidiaries to do so, except for Permitted Liens, permit any Collateral not to be subject to the first priority security interest granted herein, or enter


  
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into any agreement, document, instrument or other arrangement (except with or in favor of Bank) with any Person which directly or indirectly prohibits or has the effect of prohibiting Borrower or
any Subsidiary from assigning, mortgaging, pledging, granting a security interest in or upon, or encumbering any of Borrower’s or any Subsidiary’s Intellectual Property, except as is otherwise permitted in Section 7.1 hereof and the
definition of Permitted Liens herein. 
 7.6 Maintenance of Collateral Accounts. Maintain any Collateral Account except
pursuant to the terms of Section 6.6(b) hereof. 
 7.7 Distributions; Investments. (a) Pay any dividends or make any
distribution or payment or redeem, retire or purchase any capital stock provided that Borrower may (i) convert any of its convertible securities into other securities pursuant to the terms of such convertible securities or otherwise in exchange
thereof, (ii) pay dividends solely in common stock, (iii) pay a dividend or distribution to Pandion HoldCo to repurchase the stock of former employees, directors, officers, or consultants pursuant to stock option or stock repurchase
agreements so long as an Event of Default does not exist at the time of any such repurchase and would not exist after giving effect to any such repurchase, provided that the aggregate amount of all such repurchases does not exceed One Hundred
Thousand Dollars ($100,000.00) in any twelve (12) month period, (iv) permit Pandion HoldCo to make purchases of capital stock arising out of capital stock in connection with the exercise of stock options or stock appreciation by way of a
cashless exercise, or (v) pay a dividend or distribution to Pandion HoldCo to make cash payments in an amount not to exceed Ten Thousand Dollars ($10,000.00) in the aggregate in any twelve (12) month period in lieu of the issuance of
fractional shares upon the conversion of convertible securities, stock splits, stock combinations, or business combinations; or (b) directly or indirectly make any Investment (including, without limitation, by the formation of any Subsidiary)
other than Permitted Investments, or permit any of its Subsidiaries to do so. 
 7.8 Transactions with Affiliates. Directly or
indirectly enter into or permit to exist any material transaction with any Affiliate of Borrower, except for (a) transactions that are in the ordinary course of Borrower’s business, upon fair and reasonable terms that are no less favorable
to Borrower than would be obtained in an arm’s length transaction with a non-affiliated Person, (b) Subordinated Debt or equity financings with investors in Borrower for capital raising purposes,
(c) reasonable and customary compensation-related transactions in the ordinary course of business or otherwise as approved by the Board or by Bank, and (d) distributions of the type described in and permitted under Section 7.7. 

7.9 Subordinated Debt. (a) Make or permit any payment on any Subordinated Debt, except under the terms of the subordination,
intercreditor, or other similar agreement to which such Subordinated Debt is subject, or (b) amend any provision in any document relating to the Subordinated Debt which would increase the amount thereof, provide for earlier or greater
principal, interest, or other payments thereon, or adversely affect the subordination thereof to Obligations owed to Bank. 
 7.10
Compliance. Become an “investment company” or a company controlled by an “investment company”, under the Investment Company Act of 1940, as amended, or undertake as one of its important activities extending credit to
purchase or carry margin stock (as defined in Regulation U of the Board of Governors of the Federal Reserve System), or use the proceeds of any Credit Extension for that purpose; fail to (a) meet the minimum funding requirements of ERISA,
(b) prevent a Reportable Event or Prohibited Transaction, as defined in ERISA, from occurring, or (c) comply with the Federal Fair Labor Standards Act, the failure of any of the conditions described in clauses (a) through (c) which
could reasonably be expected to have a material adverse effect on Borrower’s business; or violate any other law or regulation, if the violation could reasonably be expected to have a material adverse effect on Borrower’s business, or
permit any of its Subsidiaries to do so; withdraw or permit any Subsidiary to withdraw from participation in, permit partial or complete termination of, or permit the occurrence of any other event with respect to, any present pension, profit sharing
and deferred compensation plan which could reasonably be expected to result in any liability of Borrower, including any liability to the Pension Benefit Guaranty Corporation or its successors or any other governmental agency. 

  
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 8. EVENTS OF DEFAULT 

Any one of the following shall constitute an event of default (an “Event of Default”) under this Agreement: 

8.1 Payment Default. Borrower fails to (a) make any payment of principal or interest on any Credit Extension when due, or
(b) pay any other Obligations within three (3) Business Days after such Obligations are due and payable (which three (3) Business Day cure period shall not apply to payments due on the Term Loan Maturity Date). During the cure period,
the failure to make or pay any payment specified under clause (b) hereunder is not an Event of Default (but no Credit Extension will be made during the cure period); 

8.2 Covenant Default. 

(a) Borrower fails or neglects to perform any obligation in Sections 6.2, 6.4, 6.5, 6.6, 6.7(b), or 6.11 or violates any covenant in
Section 7; or 
 (b) Borrower fails or neglects to perform, keep, or observe any other term, provision, condition, covenant or
agreement contained in this Agreement or any Loan Documents, and as to any default (other than those specified in this Section 8) under such other term, provision, condition, covenant or agreement that can be cured, has failed to cure the
default within ten (10) days after the occurrence thereof; provided, however, that if the default cannot by its nature be cured within the ten (10) day period or cannot after diligent attempts by Borrower be cured within such ten
(10) day period, and such default is likely to be cured within a reasonable time, then Borrower shall have an additional period (which shall not in any case exceed thirty (30) days) to attempt to cure such default, and within such
reasonable time period the failure to cure the default shall not be deemed an Event of Default (but no Credit Extensions shall be made during such cure period). Cure periods provided under this section shall not apply, among other things, to
financial covenants or any other covenants set forth in clause (a) above; 
 8.3 Material Adverse Change. A Material
Adverse Change occurs; 
 8.4 Attachment; Levy; Restraint on Business. 

(a) (i) The service of process seeking to attach, by trustee or similar process, any funds of Borrower or of any entity under the control of
Borrower (including a Subsidiary), or (ii) a notice of lien or levy is filed against any of Borrower’s assets by any Governmental Authority, and the same under subclauses (i) and (ii) hereof are not, within ten (10) days after
the occurrence thereof, discharged or stayed (whether through the posting of a bond or otherwise); provided, however, no Credit Extensions shall be made during any ten (10) day cure period; or 

(b) (i) any material portion of Borrower’s assets is attached, seized, levied on, or comes into possession of a trustee or receiver, or
(ii) any court order enjoins, restrains, or prevents Borrower from conducting all or any material part of its business; 
 8.5
Insolvency. (a) Borrower is unable to pay its debts (including trade debts) as they become due or otherwise becomes insolvent; (b) Borrower begins an Insolvency Proceeding; or (c) an Insolvency Proceeding is begun against
Borrower and is not dismissed or stayed within forty-five (45) days (but no Credit Extensions shall be made while any of the conditions described in clause (a) exist and/or until any Insolvency Proceeding is dismissed); 

8.6 Other Agreements. There is, under any agreement to which Borrower or any Guarantor is a party with a third party or parties,
(a) any default resulting in a right by such third party or parties, whether or not exercised, to accelerate the maturity of any Indebtedness in an amount individually or in the aggregate in excess of One Hundred Fifty Thousand Dollars
($150,000.00); or (b) any breach or default by Borrower or Guarantor, the result of which could reasonably be expected to have a material adverse effect on Borrower’s or any Guarantor’s business; 

8.7 Judgments; Penalties. One or more fines, penalties or final judgments, orders or decrees for the payment of money in an
amount, individually or in the aggregate, of at least One Hundred Fifty Thousand Dollars ($150,000.00) (not covered by independent third-party insurance as to which liability has been accepted by such


  
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insurance carrier) shall be rendered against Borrower by any Governmental Authority, and the same are not, within ten (10) days after the entry, assessment or issuance thereof, discharged,
satisfied, or paid, or after execution thereof, stayed or bonded pending appeal, or such judgments are not discharged prior to the expiration of any such stay (provided that no Credit Extensions will be made prior to the satisfaction, payment,
discharge, stay, or bonding of such fine, penalty, judgment, order or decree); 
 8.8 Misrepresentations. Borrower or any
Person acting for Borrower makes any representation, warranty, or other statement now or later in this Agreement, any Loan Document or in any writing delivered to Bank or to induce Bank to enter this Agreement or any Loan Document, and such
representation, warranty, or other statement is incorrect in any material respect when made; 
 8.9 Subordinated Debt. Any
document, instrument, or agreement evidencing any Subordinated Debt shall for any reason be revoked or invalidated or otherwise cease to be in full force and effect, any Person shall be in breach thereof or contest in any manner the validity or
enforceability thereof or deny that it has any further liability or obligation thereunder, or the Obligations shall for any reason be subordinated or shall not have the priority contemplated by this Agreement; 

8.10 Guaranty. (a) Any guaranty of any Obligations terminates or ceases for any reason to be in full force and effect;
(b) any Guarantor does not perform any obligation or covenant under any guaranty of the Obligations; (c) any circumstance described in Sections 8.3, 8.4, 8.5, 8.6, 8.7, or 8.8 of this Agreement occurs with respect to any Guarantor, or
(d) the death, liquidation, winding up, or termination of existence of any Guarantor; or 
 8.11 Governmental Approvals.
Any Governmental Approval shall have been (a) revoked, rescinded, suspended, modified in an adverse manner or not renewed in the ordinary course for a full term or (b) subject to any decision by a Governmental Authority that designates a
hearing with respect to any applications for renewal of any of such Governmental Approval or that could result in the Governmental Authority taking any of the actions described in clause (a) above, and such decision or such revocation,
rescission, suspension, modification or non-renewal (i) causes, or could reasonably be expected to cause, a Material Adverse Change, or (ii) adversely affects the legal qualifications of Borrower or
any of its Subsidiaries to hold such Governmental Approval in any applicable jurisdiction and such revocation, rescission, suspension, modification or non-renewal could reasonably be expected to adversely
affect the status of or legal qualifications of Borrower or any of its Subsidiaries to hold any Governmental Approval in any other jurisdiction. 

9. BANK’S RIGHTS AND REMEDIES 

9.1 Rights and Remedies. Upon the occurrence and during the continuance of an Event of Default, Bank may, without notice or
demand, do any or all of the following: 
 (a) declare all Obligations immediately due and payable (but if an Event of Default described in
Section 8.5 occurs all Obligations are immediately due and payable without any action by Bank); 
 (b) stop advancing money or
extending credit for Borrower’s benefit under this Agreement or under any other agreement between Borrower and Bank; 
 (c) demand that
Borrower (i) deposit cash with Bank in an amount equal to at least (x) one hundred five percent (105.0%) of the Dollar Equivalent of the aggregate face amount of all Letters of Credit denominated in Dollars remaining undrawn, and
(y) one hundred ten percent (110.0%) of the Dollar Equivalent of the aggregate face amount of all Letters of Credit denominated in a Foreign Currency remaining undrawn (plus, in each case, all interest, fees, and costs due or to become due in
connection therewith (as estimated by Bank in its good faith business judgment)), to secure all of the Obligations relating to such Letters of Credit, as collateral security for the repayment of any future drawings under such Letters of Credit, and
Borrower shall forthwith deposit and pay such amounts, and (ii) pay in advance all letter of credit fees scheduled to be paid or payable over the remaining term of any Letters of Credit; 

(d) terminate any FX Contracts; 

  
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 (e) verify the amount of, demand payment of and performance under, and collect any Accounts
and General Intangibles, settle or adjust disputes and claims directly with Account Debtors for amounts on terms and in any order that Bank considers advisable, and notify any Person owing Borrower money of Bank’s security interest in such
funds; 
 (f) make any payments and do any acts it considers necessary or reasonable to protect the Collateral and/or its security interest
in the Collateral. Borrower shall assemble the Collateral if Bank requests and make it available as Bank designates. Bank may enter premises where the Collateral is located, take and maintain possession of any part of the Collateral, and pay,
purchase, contest, or compromise any Lien which appears to be prior or superior to its security interest and pay all expenses incurred. Borrower grants Bank a license to enter and occupy any of its premises, without charge, to exercise any of
Bank’s rights or remedies; 
 (g) apply to the Obligations (i) any balances and deposits of Borrower it holds, or (ii) any
amount held by Bank owing to or for the credit or the account of Borrower; 
 (h) ship, reclaim, recover, store, finish, maintain, repair,
prepare for sale, advertise for sale, and sell the Collateral. Bank is hereby granted a non-exclusive, royalty-free license or other right to use, without charge, Borrower’s labels, Patents, Copyrights,
mask works, rights of use of any name, trade secrets, trade names, Trademarks, and advertising matter, or any similar property as it pertains to the Collateral, in completing production of, advertising for sale, and selling any Collateral and, in
connection with Bank’s exercise of its rights under this Section, Borrower’s rights under all licenses and all franchise agreements inure to Bank’s benefit; 

(i) place a “hold” on any account maintained with Bank and/or deliver a notice of exclusive control, any entitlement order, or other
directions or instructions pursuant to any Control Agreement or similar agreements providing control of any Collateral; 
 (j) demand and
receive possession of Borrower’s Books; and 
 (k) exercise all rights and remedies available to Bank under the Loan Documents or at
law or equity, including all remedies provided under the Code (including disposal of the Collateral pursuant to the terms thereof). 

9.2 Power of Attorney. Borrower hereby irrevocably appoints Bank as its lawful attorney-in-fact, exercisable upon the occurrence and during the continuance of an Event of Default, to: (a) endorse Borrower’s name on any checks or other forms of payment or security;
(b) sign Borrower’s name on any invoice or bill of lading for any Account or drafts against Account Debtors; (c) settle and adjust disputes and claims about the Accounts directly with Account Debtors, for amounts and on terms Bank
determines reasonable; (d) make, settle, and adjust all claims under Borrower’s insurance policies; (e) pay, contest or settle any Lien, charge, encumbrance, security interest, and adverse claim in or to the Collateral, or any
judgment based thereon, or otherwise take any action to terminate or discharge the same; and (f) transfer the Collateral into the name of Bank or a third party as the Code permits. Borrower hereby appoints Bank as its lawful attorney-in-fact to sign Borrower’s name on any documents necessary to perfect or continue the perfection of Bank’s security interest in the Collateral regardless of
whether an Event of Default has occurred until all Obligations (other than inchoate indemnity obligations, other obligations which by their terms survive the termination of this Agreement, and any Obligations under Bank Services Agreements that are
cash collateralized in accordance with Section 4.1 of this Agreement) have been satisfied in full and Bank is under no further obligation to make Credit Extensions hereunder. Bank’s foregoing appointment as Borrower’s attorney in
fact, and all of Bank’s rights and powers, coupled with an interest, are irrevocable until all Obligations (other than inchoate indemnity obligations, other obligations which by their terms survive the termination of this Agreement, and any
Obligations under Bank Services Agreements that are cash collateralized in accordance with Section 4.1 of this Agreement) have been fully repaid and performed and Bank’s obligation to provide Credit Extensions terminates. 

9.3 Protective Payments. If Borrower fails to obtain the insurance called for by Section 6.5 or fails to pay any premium
thereon or fails to pay any other amount which Borrower is obligated to pay under this Agreement or any other Loan Document or which may be required to preserve the Collateral, Bank may obtain such 

  
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insurance or make such payment, and all amounts so paid by Bank are Bank Expenses and immediately due and payable, bearing interest at the then highest rate applicable to the Obligations, and
secured by the Collateral. Bank will make reasonable efforts to provide Borrower with notice of Bank obtaining such insurance at the time it is obtained or within a reasonable time thereafter. No payments by Bank are deemed an agreement to make
similar payments in the future or Bank’s waiver of any Event of Default. 
 9.4 Application of Payments and Proceeds Upon
Default. If an Event of Default has occurred and is continuing, Bank shall have the right to apply in any order any funds in its possession, whether from Borrower account balances, payments, proceeds realized as the result of any collection of
Accounts or other disposition of the Collateral, or otherwise, to the Obligations. Bank shall pay any surplus to Borrower by credit to the Designated Deposit Account or to other Persons legally entitled thereto; Borrower shall remain liable to Bank
for any deficiency. If Bank, directly or indirectly, enters into a deferred payment or other credit transaction with any purchaser at any sale of Collateral, Bank shall have the option, exercisable at any time, of either reducing the Obligations by
the principal amount of the purchase price or deferring the reduction of the Obligations until the actual receipt by Bank of cash therefor. 

9.5 Bank’s Liability for Collateral. So long as Bank complies with reasonable banking practices regarding the safekeeping
of the Collateral in the possession or under the control of Bank, Bank shall not be liable or responsible for: (a) the safekeeping of the Collateral; (b) any loss or damage to the Collateral; (c) any diminution in the value of the
Collateral; or (d) any act or default of any carrier, warehouseman, bailee, or other Person. Borrower bears all risk of loss, damage or destruction of the Collateral. 

9.6 No Waiver; Remedies Cumulative. Bank’s failure, at any time or times, to require strict performance by Borrower of any
provision of this Agreement or any other Loan Document shall not waive, affect, or diminish any right of Bank thereafter to demand strict performance and compliance herewith or therewith. No waiver hereunder shall be effective unless signed by the
party granting the waiver and then is only effective for the specific instance and purpose for which it is given. Bank’s rights and remedies under this Agreement and the other Loan Documents are cumulative. Bank has all rights and remedies
provided under the Code, by law, or in equity. Bank’s exercise of one right or remedy is not an election and shall not preclude Bank from exercising any other remedy under this Agreement or other remedy available at law or in equity, and
Bank’s waiver of any Event of Default is not a continuing waiver. Bank’s delay in exercising any remedy is not a waiver, election, or acquiescence. 

9.7 Demand Waiver. Borrower waives demand, notice of default or dishonor, notice of payment and nonpayment, notice of any
default, nonpayment at maturity, release, compromise, settlement, extension, or renewal of accounts, documents, instruments, chattel paper, and guarantees held by Bank on which Borrower is liable. 

10. NOTICES 
 All
notices, consents, requests, approvals, demands, or other communication by any party to this Agreement or any other Loan Document must be in writing and shall be deemed to have been validly served, given, or delivered: (a) upon the earlier of
actual receipt and three (3) Business Days after deposit in the U.S. mail, first class, registered or certified mail return receipt requested, with proper postage prepaid; (b) upon transmission, when sent by electronic mail or facsimile
transmission; (c) one (1) Business Day after deposit with a reputable overnight courier with all charges prepaid; or (d) when delivered, if hand-delivered by messenger, all of which shall be addressed to the party to be notified and sent
to the address, facsimile number, or email address indicated below. Bank or Borrower may change its mailing or electronic mail address or facsimile number by giving the other party written notice thereof in accordance with the terms of this
Section 10. 

  
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		 	If to Borrower:	  	Pandion Therapeutics, Inc.	  	
		 		  	610 Main Street	  	
		 		  	North Cambridge, Massachusetts 02139	  	
		 		  	Attn: Vikas Goyal	  	
		 		  	Email: vikas.goyal@pandiontx.com	  	
				
		 	with a copy to:	  	Wilmer Cutler Pickering Hale and Dorr LLP	  	
		 		  	1225 Seventeenth Street, Suite 2600	  	
		 		  	Denver, Colorado 80202	  	
		 		  	Attn: Chalyse Robinson, Esquire	  	
		 		  	Email: Chalyse.robinson@wilmerhale.com	  	
				
		 	If to Bank:	  	Silicon Valley Bank	  	
		 		  	275 Grove Street, Suite 2-200	  	
		 		  	Newton, Massachusetts 02466	  	
		 		  	Attn: Lauren Cole	  	
		 		  	Email: lcole@svb.com	  	
				
		 	with a copy to:	  	Morrison & Foerster LLP	  	
		 		  	200 Clarendon Street	  	
		 		  	Boston, Massachusetts 02116	  	
		 		  	Attn: David A. Ephraim, Esquire	  	
		 		  	Email: DEphraim@mofo.com	  	

 11. CHOICE OF LAW, VENUE AND JURY TRIAL WAIVER 

Except as otherwise expressly provided in any of the Loan Documents, Massachusetts law governs the Loan Documents without regard to principles
of conflicts of law. Borrower and Bank each submit to the exclusive jurisdiction of the State and Federal courts in Boston, Massachusetts; provided, however, that nothing in this Agreement shall be deemed to operate to preclude Bank from bringing
suit or taking other legal action in any other jurisdiction to realize on the Collateral or any other security for the Obligations, or to enforce a judgment or other court order in favor of Bank. Borrower expressly submits and consents in advance to
such jurisdiction in any action or suit commenced in any such court, and Borrower hereby waives any objection that it may have based upon lack of personal jurisdiction, improper venue, or forum non conveniens and hereby consents to the granting of
such legal or equitable relief as is deemed appropriate by such court. Borrower hereby waives personal service of the summons, complaints, and other process issued in such action or suit and agrees that service of such summons, complaints, and other
process may be made by registered or certified mail addressed to Borrower at the address set forth in, or subsequently provided by Borrower in accordance with, Section 10 of this Agreement and that service so made shall be deemed completed upon
the earlier to occur of Borrower’s actual receipt thereof or three (3) days after deposit in the U.S. mails, proper postage prepaid. 

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, BORROWER AND BANK EACH WAIVE THEIR RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION
ARISING OUT OF OR BASED UPON THIS AGREEMENT, THE LOAN DOCUMENTS OR ANY CONTEMPLATED TRANSACTION, INCLUDING CONTRACT, TORT, BREACH OF DUTY AND ALL OTHER CLAIMS. THIS WAIVER IS A MATERIAL INDUCEMENT FOR BOTH PARTIES TO ENTER INTO THIS AGREEMENT. EACH
PARTY HAS REVIEWED THIS WAIVER WITH ITS COUNSEL. 
 This Section 11 shall survive the termination of this Agreement. 

  
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 12. GENERAL PROVISIONS 

12.1 Termination Prior to Term Loan Maturity Date; Survival. All covenants, representations and warranties made in this
Agreement shall continue in full force until this Agreement has terminated pursuant to its terms and all Obligations (other than inchoate indemnity obligations, other obligations which by their terms survive the termination of this Agreement, and
any Obligations under Bank Services Agreements that are cash collateralized in accordance with Section 4.1 of this Agreement) have been satisfied. So long as Borrower has satisfied the Obligations (other than inchoate indemnity obligations and,
any other obligations which, by their terms, are to survive the termination of this Agreement, and any Obligations under Bank Services Agreements that are cash collateralized in accordance with Section 4.1 of this Agreement), this Agreement may
be terminated prior to the Term Loan Maturity Date by Borrower, effective three (3) Business Days after written notice of termination is given to Bank. Those obligations that are expressly specified in this Agreement as surviving this
Agreement’s termination shall continue to survive notwithstanding this Agreement’s termination. 
 12.2 Successors and
Assigns. This Agreement binds and is for the benefit of the successors and permitted assigns of each party. Borrower may not assign this Agreement or any rights or obligations under it without Bank’s prior written consent (which may be
granted or withheld in Bank’s discretion). Bank has the right, without the consent of or notice to Borrower, to sell, transfer, assign, negotiate, or grant participation in all or any part of, or any interest in, Bank’s obligations,
rights, and benefits under this Agreement and the other Loan Documents (other than the Warrant, as to which assignment, transfer and other such actions are governed by the terms thereof). Notwithstanding the foregoing, prior to the occurrence of an
Event of Default that is continuing, Bank shall not assign any interest in the Loan Documents to any person who is a direct competitor of Borrower. 

12.3 Indemnification. Borrower agrees to indemnify, defend and hold Bank and its directors, officers, employees, agents,
attorneys, or any other Person affiliated with or representing Bank (each, an “Indemnified Person”) harmless against: (i) all obligations, demands, claims, and liabilities (collectively, “Claims”) claimed or
asserted by any other party in connection with the transactions contemplated by the Loan Documents; and (ii) all losses or documented out-of-pocket expenses
(including Bank Expenses) in any way suffered, incurred, or paid by such Indemnified Person as a result of, following from, consequential to, or arising from transactions between Bank and Borrower (including reasonable attorneys’ fees and
documented out-of-pocket expenses), except for Claims and/or losses directly caused by such Indemnified Person’s gross negligence or willful misconduct. 

This Section 12.3 shall survive until all statutes of limitation with respect to the Claims, losses, and expenses for which indemnity is
given shall have run. 
 12.4 Time of Essence. Time is of the essence for the performance of all Obligations in this
Agreement. 
 12.5 Severability of Provisions. Each provision of this Agreement is severable from every other provision in
determining the enforceability of any provision. 
 12.6 Correction of Loan Documents. Bank may correct patent errors and fill
in any blanks in the Loan Documents consistent with the agreement of the parties. 
 12.7 Amendments in Writing; Waiver;
Integration. No purported amendment or modification of any Loan Document, or waiver, discharge or termination of any obligation under any Loan Document, shall be enforceable or admissible unless, and only to the extent, expressly set forth in a
writing signed by the party against which enforcement or admission is sought. Without limiting the generality of the foregoing, no oral promise or statement, nor any action, inaction, delay, failure to require performance or course of conduct shall
operate as, or evidence, an amendment, supplement or waiver or have any other effect on any Loan Document. Any waiver granted shall be limited to the specific circumstance expressly described in it, and shall not apply to any subsequent or other
circumstance, whether similar or dissimilar, or give rise to, or evidence, any obligation or commitment to grant any further waiver. The Loan Documents represent the entire agreement about this subject matter and supersede prior negotiations or
agreements. All prior agreements, understandings, representations, warranties, and negotiations between the parties about the subject matter of the Loan Documents merge into the Loan Documents. 

12.8 Counterparts. This Agreement may be executed in any number of counterparts and by different parties on separate
counterparts, each of which, when executed and delivered, is an original, and all taken together, constitute one Agreement. 

  
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 12.9 Confidentiality. In handling any confidential information, Bank shall
exercise the same degree of care that it exercises for its own proprietary information, but disclosure of information may be made: (a) to Bank’s Subsidiaries or Affiliates (such Subsidiaries and Affiliates, together with Bank,
collectively, “Bank Entities”); (b) to prospective transferees or purchasers of any interest in the Credit Extensions (provided that any prospective transferee or purchaser shall have entered into an agreement containing provisions
substantially the same as those in this Section); (c) as required by law, regulation, subpoena, or other order; (d) to Bank’s regulators or as otherwise required in connection with Bank’s examination or audit; (e) as Bank
considers appropriate in exercising remedies under the Loan Documents; and (f) to third-party service providers of Bank so long as such service providers have executed a confidentiality agreement with Bank with terms no less restrictive than
those contained herein. Confidential information does not include information that is either: (i) in the public domain or in Bank’s possession when disclosed to Bank, or becomes part of the public domain (other than as a result of its
disclosure by Bank in violation of this Agreement) after disclosure to Bank; or (ii) disclosed to Bank by a third party, if Bank does not know that the third party is prohibited from disclosing the information. 

Bank Entities may use anonymous forms of confidential information for aggregate datasets, for analyses or reporting, and for any other uses
not expressly prohibited in writing by Borrower. The provisions of the immediately preceding sentence shall survive termination of this Agreement. 

12.10 Right of Set Off. Borrower hereby grants to Bank, a lien, security interest and right of set off as security for all
Obligations to Bank, whether now existing or hereafter arising upon and against all deposits, credits, collateral and property, now or hereafter in the possession, custody, safekeeping or control of Bank or any entity under the control of Bank
(including a Bank subsidiary) or in transit to any of them. At any time after the occurrence and during the continuance of an Event of Default, without demand or notice, Bank may set off the same or any part thereof and apply the same to any
liability or obligation of Borrower even though unmatured and regardless of the adequacy of any other collateral securing the Obligations. ANY AND ALL RIGHTS TO REQUIRE BANK TO EXERCISE ITS RIGHTS OR REMEDIES WITH RESPECT TO ANY OTHER COLLATERAL
WHICH SECURES THE OBLIGATIONS, PRIOR TO EXERCISING ITS RIGHT OF SETOFF WITH RESPECT TO SUCH DEPOSITS, CREDITS OR OTHER PROPERTY OF BORROWER ARE HEREBY KNOWINGLY, VOLUNTARILY AND IRREVOCABLY WAIVED. 

12.11 Electronic Execution of Documents. The words “execution,” “signed,” “signature” and words of
like import in any Loan Document shall be deemed to include electronic signatures or the keeping of records in electronic form, each of which shall be of the same legal effect, validity and enforceability as a manually executed signature or the use
of a paper-based recordkeeping systems, as the case may be, to the extent and as provided for in any applicable law, including, without limitation, any state law based on the Uniform Electronic Transactions Act. 

12.12 Captions. The headings used in this Agreement are for convenience only and shall not affect the interpretation of this
Agreement. 
 12.13 Construction of Agreement. The parties mutually acknowledge that they and their attorneys have
participated in the preparation and negotiation of this Agreement. In cases of uncertainty this Agreement shall be construed without regard to which of the parties caused the uncertainty to exist. 

12.14 Relationship. The relationship of the parties to this Agreement is determined solely by the provisions of this Agreement.
The parties do not intend to create any agency, partnership, joint venture, trust, fiduciary or other relationship with duties or incidents different from those of parties to an arm’s-length contract.

 12.15 Third Parties. Nothing in this Agreement, whether express or implied, is intended to: (a) confer any benefits,
rights or remedies under or by reason of this Agreement on any persons other than the express parties to it and their respective permitted successors and assigns; (b) relieve or discharge the obligation or liability of any person not an express
party to this Agreement; or (c) give any person not an express party to this Agreement any right of subrogation or action against any party to this Agreement. 

  
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 13. DEFINITIONS 

13.1 Definitions. As used in the Loan Documents, the word “shall” is mandatory, the word “may” is
permissive, the word “or” is not exclusive, the words “includes” and “including” are not limiting, the singular includes the plural, and numbers denoting amounts that are set off in brackets are negative. As used in
this Agreement, the following capitalized terms have the following meanings: 
 “Account” is any “account” as
defined in the Code with such additions to such term as may hereafter be made, and includes, without limitation, all accounts receivable and other sums owing to Borrower. 

“Account Debtor” is any “account debtor” as defined in the Code with such additions to such term as may hereafter
be made. 
 “Affiliate” is, with respect to any Person, each other Person that owns or controls directly or indirectly the
Person, any Person that controls or is controlled by or is under common control with the Person, and each of that Person’s senior executive officers, directors, partners and, for any Person that is a limited liability company, that
Person’s managers and members. 
 “Agreement” is defined in the preamble hereof. 

“Authorized Signer” is any individual listed in Borrower’s Borrowing Resolutions who is authorized to execute the Loan
Documents, including any Credit Extension request, on behalf of Borrower. 
 “Bank” is defined in the preamble hereof. 

“Bank Entities” is defined in Section 12.9. 

“Bank Expenses” are all audit fees and expenses, costs, and expenses (including reasonable and documented attorneys’
fees and expenses) for preparing, amending, negotiating, administering, defending and enforcing the Loan Documents (including, without limitation, those incurred in connection with appeals or Insolvency Proceedings) or otherwise incurred with
respect to Borrower or any Guarantor. 
 “Bank Services” are any products, credit services, and/or financial
accommodations previously, now, or hereafter provided to Borrower or any of its Subsidiaries by Bank or any Bank Affiliate, including, without limitation, any letters of credit, cash management services (including, without limitation, merchant
services, direct deposit of payroll, business credit cards, and check cashing services), interest rate swap arrangements, and foreign exchange services as any such products or services may be identified in Bank’s various agreements related
thereto (each, a “Bank Services Agreement”). 
 “Bank Services Agreement” is defined in the definition of
Bank Services. 
 “Board” means Borrower’s board of directors. 

“Borrower” is defined in the preamble hereof. 

“Borrower’s Books” are all Borrower’s books and records including ledgers, federal and state tax returns, records
regarding Borrower’s assets or liabilities, the Collateral, business operations or financial condition, and all computer programs or storage or any equipment containing such information. 

“Borrowing Resolutions” are, with respect to any Person, those resolutions adopted by such Person’s board of directors
(and, if required under the terms of such Person’s Operating Documents, stockholders) and delivered by such Person to Bank approving the Loan Documents to which such Person is a party and the transactions contemplated thereby, together with a
certificate executed by its secretary on behalf of such Person certifying (a) such Person has the authority to execute, deliver, and perform its obligations under each of the Loan Documents to which it is a party, (b) that set forth as a
part of or attached as an exhibit to such certificate is a true, correct, and complete copy of the resolutions then in full force and effect authorizing and ratifying the execution, delivery, and performance by such Person of the Loan Documents to
which it is a party, (c) the name(s) of the 

  
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Person(s) authorized to execute the Loan Documents, including any Credit Extension request, on behalf of such Person, together with a sample of the true signature(s) of such Person(s), and
(d) that Bank may conclusively rely on such certificate unless and until such Person shall have delivered to Bank a further certificate canceling or amending such prior certificate. 

“Business Day” is any day that is not a Saturday, Sunday or a day on which Bank is closed. 

“Cash Equivalents” means (a) marketable direct obligations issued or unconditionally guaranteed by the United States or
any agency or any State thereof having maturities of not more than one (1) year from the date of acquisition; (b) commercial paper maturing no more than one (1) year after its creation and having the highest rating from either
Standard & Poor’s Ratings Group or Moody’s Investors Service, Inc.; (c) Bank’s certificates of deposit issued maturing no more than one (1) year after issue; and (d) money market funds at least ninety-five percent
(95.0%) of the assets of which constitute Cash Equivalents of the kinds described in clauses (a) through (c) of this definition. 

“Change in Control” means at any time, any “person” or “group” (as such terms are used in Sections 13(d)
and 14(d) of the Exchange Act) shall become, or obtain rights (whether by means of warrants, options or otherwise) to become, the “beneficial owner” (as defined in Rules 13(d)-3 and 13(d)-5 under the Exchange Act), directly or indirectly, of forty-nine percent (49.0%) or more of the ordinary voting power for the election of directors of Borrower (determined on a fully diluted basis) other than
by the sale of Borrower’s equity securities in a public offering or to venture capital or private equity investors so long as Borrower identifies to Bank the venture capital or private equity investors at least seven (7) Business Days
prior to the closing of the transaction and provides to Bank a description of the material terms of the transaction. 

“Claims” is defined in Section 12.3. 

“Code” is the Uniform Commercial Code, as the same may, from time to time, be enacted and in effect in the Commonwealth of
Massachusetts; provided, that, to the extent that the Code is used to define any term herein or in any Loan Document and such term is defined differently in different Articles or Divisions of the Code, the definition of such term contained in
Article or Division 9 shall govern; provided further, that in the event that, by reason of mandatory provisions of law, any or all of the attachment, perfection, or priority of, or remedies with respect to, Bank’s Lien on any Collateral is
governed by the Uniform Commercial Code in effect in a jurisdiction other than the Commonwealth of Massachusetts, the term “Code” shall mean the Uniform Commercial Code as enacted and in effect in such other jurisdiction solely for
purposes of the provisions thereof relating to such attachment, perfection, priority, or remedies and for purposes of definitions relating to such provisions. 

“Collateral” is any and all properties, rights and assets of Borrower described on Exhibit A. 

“Collateral Account” is any Deposit Account, Securities Account, or Commodity Account. 

“Commodity Account” is any “commodity account” as defined in the Code with such additions to such term as may
hereafter be made. 
 “Compliance Certificate” is that certain certificate in the form attached hereto as
Exhibit B. 
 “Contingent Obligation” is, for any Person, any direct or indirect liability,
contingent or not, of that Person for (a) any indebtedness, lease, dividend, letter of credit or other obligation of another such as an obligation, in each case, directly or indirectly guaranteed, endorsed,
co-made, discounted or sold with recourse by that Person, or for which that Person is directly or indirectly liable; (b) any obligations for undrawn letters of credit for the account of that Person; and
(c) all obligations from any interest rate, currency or commodity swap agreement, interest rate cap or collar agreement, or other agreement or arrangement designated to protect a Person against fluctuation in interest rates, currency exchange
rates or commodity prices; but “Contingent Obligation” does not include endorsements in the ordinary course of business. The amount of a Contingent Obligation is the stated or determined amount of the primary obligation for which the
Contingent Obligation is made or, if not determinable, the maximum reasonably anticipated liability for it determined by the Person in good faith; but the amount may not exceed the maximum of the obligations under any guarantee or other support
arrangement. 

  
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 “Control Agreement” is any control agreement entered into among the
depository institution at which Borrower maintains a Deposit Account or the securities intermediary or commodity intermediary at which Borrower maintains a Securities Account or a Commodity Account, Borrower, and Bank pursuant to which Bank obtains
control (within the meaning of the Code) over such Deposit Account, Securities Account, or Commodity Account. 

“Copyrights” are any and all copyright rights, copyright applications, copyright registrations and like protections in each
work of authorship and derivative work thereof, whether published or unpublished and whether or not the same also constitutes a trade secret. 

“Credit Extension” is any Term Loan Advance or any other extension of credit by Bank for Borrower’s benefit. 

“Default Rate” is defined in Section 2.2(b). 

“Deposit Account” is any “deposit account” as defined in the Code with such additions to such term as may hereafter
be made. 
 “Designated Deposit Account” is the account number ending 221 (last three digits) maintained by Borrower with
Bank (provided, however, if no such account number is included, then the Designated Deposit Account shall be any deposit account of Borrower maintained with Bank as chosen by Bank). 

“Division” means, in reference to any Person which is an entity, the division of such Person into two (2) or more
separate Persons, with the dividing Person either continuing or terminating its existence as part of such division, including, without limitation, as contemplated under Section 18-217 of the Delaware
Limited Liability Company Act for limited liability companies formed under Delaware law, or any analogous action taken pursuant to any other applicable law with respect to any corporation, limited liability company, partnership or other entity. 

“Dollars,” “dollars” or use of the sign “$” means only lawful money of the
United States and not any other currency, regardless of whether that currency uses the “$” sign to denote its currency or may be readily converted into lawful money of the United States. 

“Dollar Equivalent” is, at any time, (a) with respect to any amount denominated in Dollars, such amount, and
(b) with respect to any amount denominated in a Foreign Currency, the equivalent amount therefor in Dollars as determined by Bank at such time on the basis of the then-prevailing rate of exchange in San Francisco, California, for sales of the
Foreign Currency for transfer to the country issuing such Foreign Currency. 
 “Draw Period B” is the period of time
commencing upon the Effective Date and continuing through the earlier to occur of June 30, 2020. 
 “Draw Period C” is
the period of time commencing upon the occurrence of the Milestone Event and continuing through June 30, 2020. 
 “Effective
Date” is defined in the preamble hereof. 
 “Equipment” is all “equipment” as defined in the Code with
such additions to such term as may hereafter be made, and includes without limitation all machinery, fixtures, goods, vehicles (including motor vehicles and trailers), and any interest in any of the foregoing. 

“ERISA” is the Employee Retirement Income Security Act of 1974, and its regulations. 

“Event of Default” is defined in Section 8. 

  
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 “Exchange Act” is the Securities Exchange Act of 1934, as amended. 

“Experimental Compounds” means biopharmaceutical compounds and therapeutic materials that remain subject to clinical trials
and have not yet received regulatory approval. 
 “FDA” shall mean the United States Food and Drug Administration, and any
successor thereto. 
 “Final Payment” is a payment (in addition to and not in substitution for the regular monthly payments
of principal plus accrued interest) equal to the original principal amount of the Term Loan Advances extended by the Bank to Borrower hereunder multiplied by four and one-quarter of one percent (4.25%) due on
the earliest to occur of (a) the Term Loan Maturity Date, (b) the payment in full of the Term Loan Advances, (c) as required by Section 2.1.1(d) or Section 2.1.1(e), or (d) the termination of this Agreement. 

“Foreign Currency” means lawful money of a country other than the United States. 

“Funding Date” is any date on which a Credit Extension is made to or for the account of Borrower which shall be a Business
Day. 
 “FX Contract” is any foreign exchange contract by and between Borrower and Bank under which Borrower commits to
purchase from or sell to Bank a specific amount of Foreign Currency on a specified date. 
 “GAAP” is generally accepted
accounting principles set forth in the opinions and pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board or in such
other statements by such other Person as may be approved by a significant segment of the accounting profession, which are applicable to the circumstances as of the date of determination. 

“General Intangibles” is all “general intangibles” as defined in the Code in effect on the date hereof with such
additions to such term as may hereafter be made, and includes without limitation, all Intellectual Property, claims, income and other tax refunds, security and other deposits, payment intangibles, contract rights, options to purchase or sell real or
personal property, rights in all litigation presently or hereafter pending (whether in contract, tort or otherwise), insurance policies (including without limitation key man, property damage, and business interruption insurance), payments of
insurance and rights to payment of any kind. 
 “Governmental Approval” is any consent, authorization, approval, order,
license, franchise, permit, certificate, accreditation, registration, filing or notice, of, issued by, from or to, or other act by or in respect of, any Governmental Authority. 

“Governmental Authority” is any nation or government, any state or other political subdivision thereof, any agency,
authority, instrumentality, regulatory body, court, central bank or other entity exercising executive, legislative, judicial, taxing, regulatory or administrative functions of or pertaining to government, any securities exchange and any
self-regulatory organization. 
 “Guarantor” is (a) Pandion HoldCo and (b) any other Person providing a Guaranty
in favor of Bank. 
 “Guaranty” is (a) that certain Unconditional Guaranty by Pandion HoldCo in favor of Bank dated as
of the Effective Date and (b) any other guarantee of all or any part of the Obligations, in each case, as the same may from time to time be amended, restated, modified or otherwise supplemented. 

“Indebtedness” is (a) indebtedness for borrowed money or the deferred price of property or services, such as
reimbursement and other obligations for surety bonds and letters of credit, (b) obligations evidenced by notes, bonds, debentures or similar instruments, (c) capital lease obligations, and (d) Contingent Obligations. 

“Indemnified Person” is defined in Section 12.3. 

  
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 “Insolvency Proceeding” is any proceeding by or against any Person under
the United States Bankruptcy Code, or any other bankruptcy or insolvency law, including assignments for the benefit of creditors, compositions, extensions generally with its creditors, or proceedings seeking reorganization, arrangement, or other
relief. 
 “Intellectual Property” means, with respect to any Person, all of such Person’s right, title, and interest
in and to the following: 
 (a) its Copyrights, Trademarks and Patents; 

(b) any and all trade secrets and trade secret rights, including, without limitation, any rights to unpatented inventions, know-how, and operating manuals; 
 (c) any and all source code; 

(d) any and all design rights which may be available to such Person; 

(e) any and all claims for damages by way of past, present and future infringement of any of the foregoing, with the right, but not the
obligation, to sue for and collect such damages for said use or infringement of the Intellectual Property rights identified above; and 

(f) all amendments, renewals and extensions of any of the Copyrights, Trademarks or Patents. 

“Inventory” is all “inventory” as defined in the Code in effect on the date hereof with such additions to such term
as may hereafter be made, and includes without limitation all merchandise, raw materials, parts, supplies, packing and shipping materials, work in process and finished products, including without limitation such inventory as is temporarily out of
Borrower’s custody or possession or in transit and including any returned goods and any documents of title representing any of the above. 

“Investment” is any beneficial ownership interest in any Person (including stock, partnership interest or other securities),
and any loan, advance or capital contribution to any Person. 
 “Key Person” is Borrower’s Chief Executive Officer,
who is Rahul Kakkar as of the Effective Date. 
 “Letter of Credit” is a standby or commercial letter of credit issued by
Bank upon request of Borrower based upon an application, guarantee, indemnity, or similar agreement. 
 “Lien” is a claim,
mortgage, deed of trust, levy, charge, pledge, security interest or other encumbrance of any kind, whether voluntarily incurred or arising by operation of law or otherwise against any property. 

“Loan Documents” are, collectively, this Agreement and any schedules, exhibits, certificates, notices, and any other
documents related to this Agreement, the Warrant, the Perfection Certificate, the Stock Pledge Agreement, the Guaranty, any Control Agreement, any Bank Services Agreement, any subordination agreement, any note, or notes or guaranties executed by
Borrower or any Guarantor, and any other present or future agreement by Borrower and/or any Guarantor with or for the benefit of Bank in connection with this Agreement or Bank Services, all as amended, restated, or otherwise modified. 

“Material Adverse Change” is (a) a material impairment in the perfection or priority of Bank’s Lien in the
Collateral or in the value of such Collateral; (b) a material adverse change in the business, operations, or condition (financial or otherwise) of Borrower; or (c) a material impairment of the prospect of repayment of any portion of the
Obligations. 
 “Milestone Event” means confirmation by Bank in writing that, after the Effective Date, but on or prior to
June 30, 2020, (a) Borrower has delivered evidence satisfactory to Bank in its sole and absolute discretion that the FDA has accepted Borrower’s investigational new drug application for PT-101 or
(b) Borrower has received unrestricted and unencumbered gross cash proceeds in an aggregate amount of at least Eighteen Million Dollars ($18,000,000.00) with respect to the issuance and sale by Borrower of its final Series A equity securities
to investors reasonably acceptable to Bank. 

  
 -25- 













 “Monthly Financial Statements” is defined in Section 6.2(a). 

“Non-U.S. Lender” is defined in Section 2.5. 

“Obligations” are Borrower’s obligations to pay when due any debts, principal, interest, fees, Bank Expenses, the
Prepayment Fee, the Final Payment and other amounts Borrower owes Bank now or later, whether under this Agreement, the other Loan Documents (which does not include the Warrant), or otherwise, including, without limitation, all obligations relating
to Bank Services and any interest accruing after Insolvency Proceedings begin and debts, liabilities, or obligations of Borrower assigned to Bank, and to perform Borrower’s duties under the Loan Documents (which does not include the Warrant).

 “Operating Documents” are, for any Person, such Person’s formation documents, as certified by the Secretary of
State (or equivalent agency) of such Person’s jurisdiction of organization on a date that is no earlier than thirty (30) days prior to the Effective Date, and, (a) if such Person is a corporation, its bylaws in current form,
(b) if such Person is a limited liability company, its limited liability company agreement (or similar agreement), and (c) if such Person is a partnership, its partnership agreement (or similar agreement), each of the foregoing with all
current amendments or modifications thereto. 
 “Pandion HoldCo” is Pandion Therapeutics HoldCo LLC, a Delaware limited
liability company. 
 “Patents” means all patents, patent applications and like protections including without limitation
improvements, divisions, continuations, renewals, reissues, extensions and continuations-in-part of the same. 

“Payment/Advance Form” is that certain form attached hereto as Exhibit C. 

“Payment Date” is the first (1st) calendar day of each month. 

“Perfection Certificate” is defined in Section 5.1. 

“Permitted Indebtedness” is: 

(a) Borrower’s Indebtedness to Bank under this Agreement and the other Loan Documents; 

(b) Indebtedness existing on the Effective Date and shown on the Perfection Certificate; 

(c) Subordinated Debt; 
 (d)
unsecured Indebtedness to trade creditors incurred in the ordinary course of business; 
 (e) Indebtedness incurred as a result of endorsing
negotiable instruments received in the ordinary course of business; 
 (f) Indebtedness secured by Liens permitted under clauses
(a) and (c) of the definition of Permitted Liens hereunder; 
 (g) other unsecured Indebtedness not otherwise permitted by
Section 7.4 not exceeding Fifty Thousand Dollars ($50,000.00) in the aggregate outstanding at any time; and 
 (h) extensions,
refinancings, modifications, amendments and restatements of any items of Permitted Indebtedness (a) through (g) above, provided that the principal amount thereof is not increased or the terms thereof are not modified to impose more burdensome
terms upon Borrower or its Subsidiary, as the case may be. 

  
 -26- 













 “Permitted Investments” are: 

(a) Investments (including, without limitation, Subsidiaries) existing on the Effective Date and shown on the Perfection Certificate; 

(b) Investments consisting of Cash Equivalents; 

(c) Investments consisting of the endorsement of negotiable instruments for deposit or collection or similar transactions in the ordinary
course of Borrower; 
 (d) Investments accepted in connection with Transfers permitted by Section 7.1; 

(e) Investments consisting of (i) travel advances and employee relocation loans and other employee loans and advances in the ordinary
course of business, and (ii) loans to employees, officers or directors relating to the purchase of equity securities of Borrower or its Subsidiaries pursuant to employee stock purchase plans or agreements approved by the Board; 

(f) Investments (including debt obligations) received in connection with the bankruptcy or reorganization of customers or suppliers and in
settlement of delinquent obligations of, and other disputes with, customers or suppliers arising in the ordinary course of business; 
 (g)
Investments consisting of notes receivable of, or prepaid royalties and other credit extensions, to customers and suppliers who are not Affiliates, in the ordinary course of business; provided that this paragraph (i) shall not apply to
Investments of Borrower in any Subsidiary; 
 (h) cash Investments by Borrower in Securities Corp.; provided that no Event of Default has
occurred and is continuing or would result from such Investment; 
 (i) Investments by Borrower in ProgramCo for ordinary, necessary and
current operating expenses, provided that subject to Section 6.6(a) hereof, the maximum aggregate amount of all cash balances maintained with ProgramCo does not exceed Five Million Dollars ($5,000,000.00) and provided further, that an Event of
Default does not exist at the time of any such Investment and would not exist after giving effect to any such Investment; and 
 (j) other
Investments not otherwise permitted by Section 7.7 not exceeding Fifty Thousand Dollars ($50,000.00) in the aggregate outstanding at any time. 

“Permitted Liens” are: 

(a) Liens existing on the Effective Date and shown on the Perfection Certificate or arising under this Agreement and the other Loan Documents;

 (b) Liens for taxes, fees, assessments or other government charges or levies, either (i) not due and payable or (ii) being
contested in good faith and for which Borrower maintains adequate reserves on its Books, provided that no notice of any such Lien has been filed or recorded under the Internal Revenue Code of 1986, as amended, and the Treasury Regulations
adopted thereunder; 
 (c) purchase money Liens or capital leases (i) on Equipment acquired or held by Borrower incurred for financing
the acquisition of the Equipment securing no more than One Hundred Thousand Dollars ($100,000.00) in the aggregate amount outstanding, or (ii) existing on Equipment when acquired, if the Lien is confined to the property and improvements
and the proceeds of the Equipment; 

  
 -27- 













 (d) leases or subleases of real property granted in the ordinary course of Borrower’s
business (or, if referring to another Person, in the ordinary course of such Person’s business), and leases, subleases, non-exclusive licenses or sublicenses of personal property (other than Intellectual
Property) granted in the ordinary course of Borrower’s business (or, if referring to another Person, in the ordinary course of such Person’s business), if the leases, subleases, licenses and sublicenses do not prohibit granting Bank a
security interest therein; 
 (e) Liens of carriers, warehousemen, suppliers, or other Persons that are possessory in nature arising in the
ordinary course of business so long as such Liens attach only to Inventory, securing liabilities in the aggregate amount not to exceed Fifty Thousand Dollars ($50,000.00) and which are not delinquent or remain payable without penalty or which are
being contested in good faith and by appropriate proceedings which proceedings have the effect of preventing the forfeiture or sale of the property subject thereto; 

(f) non-exclusive licenses of Intellectual Property granted to third parties in the ordinary course of
business, and licenses of Intellectual Property that could not result in a legal transfer of title of the licensed property that may be exclusive in respects other than territory and that may be exclusive as to territory only as to discreet
geographical areas outside of the United States; 
 (g) Liens to secure payment of workers’ compensation, employment insurance, old-age pensions, social security and other like obligations incurred in the ordinary course of business (other than Liens imposed by ERISA); 

(h) Liens arising from attachments or judgments, orders, or decrees in circumstances not constituting an Event of Default under Sections 8.4
and 8.7; 
 (i) Liens in favor of other financial institutions arising in connection with Borrower’s deposit and/or securities accounts
held at such institutions, provided that (i) Bank has a first priority perfected security interest in the amounts held in such deposit and/or securities accounts (ii) such accounts are permitted to be maintained pursuant to
Section 6.8 of this Agreement; 
 (j) the filing of financing statements solely as a precautionary measure in connection with operating
leases; 
 (k) easements, zoning restrictions,
rights-of-way, minor defects or irregularities of title and other similar encumbrances on real property imposed by law or arising in the ordinary course of business that
do not secure any monetary obligations and do not interfere with the ordinary course of business Borrower’s business in any material respect; and 

(l) Liens incurred in the extension, renewal or refinancing of the indebtedness secured by Liens described in (a) through (k), but
any extension, renewal or replacement Lien must be limited to the property encumbered by the existing Lien and the principal amount of the indebtedness may not increase. 

“Person” is any individual, sole proprietorship, partnership, limited liability company, joint venture, company, trust,
unincorporated organization, association, corporation, institution, public benefit corporation, firm, joint stock company, estate, entity or government agency. 

“Prepayment Fee” shall be an additional fee, payable to Bank, with respect to the Term Loan Advances, in an amount equal to:

 (a) for a prepayment of the Term Loan Advances made on or prior to November 8, 2020, three percent (3.0%) of the then outstanding
principal amount of such Term Loan Advances immediately prior to the date of such prepayment; 
 (b) for a prepayment of the Term Loan
Advances made after November 8, 2020, but on or prior to November 8, 2021, two percent (2.0%) of the then outstanding principal amount of such Term Loan Advances immediately prior to the date of such prepayment; and 

  
 -28- 













 (c) for a prepayment of the Term Loan Advances made after November 8, 2021, but prior
to the Term Loan Maturity Date, one percent (1.0%) of the then outstanding principal amount of such Term Loan Advances immediately prior to the date of such prepayment. 

“Prime Rate” is the rate of interest per annum from time to time published in the money rates section of The Wall Street
Journal or any successor publication thereto as the “prime rate” then in effect; provided that, in the event such rate of interest is less than zero, such rate shall be deemed to be zero for purposes of this Agreement and provided further
that if such rate of interest, as set forth from time to time in the money rates section of The Wall Street Journal, becomes unavailable for any reason as determined by Bank, the “Prime Rate” shall mean the rate of interest per annum
announced by Bank as its prime rate in effect at its principal office in the State of California (such Bank announced Prime Rate not being intended to be the lowest rate of interest charged by Bank in connection with extensions of credit to
debtors); provided that, in the event such rate of interest is less than zero, such rate shall be deemed to be zero for purposes of this Agreement. 

“ProgramCo” means Pandion ProgramCo 1, Inc., a Delaware corporation. 

“Registered Organization” is any “registered organization” as defined in the Code with such additions to such term
as may hereafter be made. 
 “Requirement of Law” is as to any Person, the organizational or governing documents of such
Person, and any law (statutory or common), treaty, rule or regulation or determination of an arbitrator or a court or other Governmental Authority, in each case applicable to or binding upon such Person or any of its property or to which such Person
or any of its property is subject. 
 “Responsible Officer” is any of the Chief Executive Officer, President, Chief
Financial Officer and Controller of Borrower. 
 “Restricted License” is any material license or other agreement with
respect to which Borrower is the licensee (a) that prohibits or otherwise restricts Borrower from granting a security interest in Borrower’s interest in such license or agreement or any other property, or (b) for which a default under
or termination of could interfere with the Bank’s right to sell any Collateral. 
 “SEC” shall mean the Securities and
Exchange Commission, any successor thereto, and any analogous Governmental Authority. 
 “Securities Account” is any
“securities account” as defined in the Code with such additions to such term as may hereafter be made. 
 Securities
Corp.” is Pandion Securities Corp., a corporation organized under the laws of the Commonwealth of Massachusetts and a Subsidiary of Borrower. 

“Stock Pledge Agreement” means collectively, (a) that certain Stock Pledge Agreement by and between Borrower and Bank,
dated as of the Effective Date, and (b) that certain Stock Pledge Agreement by and between Pandion HoldCo and Bank dated as of the Effective Date, in each case, as may be amended, modified, supplemented or restated from time to time. 

“Subordinated Debt” is indebtedness incurred by Borrower subordinated to all of Borrower’s now or hereafter indebtedness
to Bank (pursuant to a subordination, intercreditor, or other similar agreement in form and substance satisfactory to Bank entered into between Bank and the other creditor), on terms acceptable to Bank. 

“Subsidiary” is, as to any Person, a corporation, partnership, limited liability company or other entity of which shares of
stock or other ownership interests having ordinary voting power (other than stock or such other ownership interests having such power only by reason of the happening of a contingency) to elect a majority of the board of directors or other managers
of such corporation, partnership or other entity are at the time owned, or the management of which is otherwise controlled, directly or indirectly through one or more intermediaries, or both, by such Person. Unless the context otherwise requires,
each reference to a Subsidiary herein shall be a reference to a Subsidiary of Borrower or Guarantor (excluding ProgramCo). 

  
 -29- 













 “Term A Loan Advance” is defined in Section 2.1.1(a). 

“Term B Loan Advance” is defined in Section 2.1.1(a). 

“Term C Loan Advance” is defined in Section 2.1.1(a). 

“Term Loan Advance” and “Term Loan Advances” are each defined in Section 2.1.1(a). 

“Term Loan Maturity Date” is November 1, 2023. 

“Trademarks” means any trademark and servicemark rights, whether registered or not, applications to register and
registrations of the same and like protections, and the entire goodwill of the business of Borrower connected with and symbolized by such trademarks. 

“Transfer” is defined in Section 7.1. 

“Warrant” is that certain warrant to purchase stock by and between Pandion HoldCo and Bank dated as of the Effective Date, as
may be amended, modified, supplemented and/or restated from time to time. 
 [Signature page follows.] 

  
 -30- 













 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed as a
sealed instrument under the laws of the Commonwealth of Massachusetts as of the Effective Date. 
  

			
	BORROWER:
	
	PANDION THERAPEUTICS, INC.
		
	By	 	/s/ Rahul Kakkar
	Name:	 	Rahul Kakkar
	Title:	 	Chief Executive Officer
	
	BANK:
	
	SILICON VALLEY BANK
		
	By	 	/s/ Lauren Cole
	Name:	 	Lauren Cole
	Title:	 	Director


  
 Signature Page to Loan
and Security Agreement 













 EXHIBIT A – COLLATERAL DESCRIPTION 

The Collateral consists of all of Borrower’s right, title and interest in and to the following personal property: 

All goods, Accounts (including health-care receivables), Equipment, Inventory, contract rights or rights to payment of money, leases, license
agreements, franchise agreements, General Intangibles (except as provided below), commercial tort claims, documents, instruments (including any promissory notes), chattel paper (whether tangible or electronic), cash, deposit accounts, certificates
of deposit, fixtures, letters of credit rights (whether or not the letter of credit is evidenced by a writing), securities, and all other investment property, supporting obligations, and financial assets, whether now owned or hereafter acquired,
wherever located; and 
 all Borrower’s Books relating to the foregoing, and any and all claims, rights and interests in any of the
above and all substitutions for, additions, attachments, accessories, accessions and improvements to and replacements, products, proceeds and insurance proceeds of any or all of the foregoing. 

Notwithstanding the foregoing, the Collateral does not include (a) any Intellectual Property; provided, however, the Collateral shall
include all Accounts and all proceeds of Intellectual Property and (b) any property to the extent that such grant of security interest is prohibited by any Requirement of Law of a Governmental Authority or constitutes a breach or default under
or results in the termination of or requires any consent not obtained under, any contract, license, agreement, instrument or other document evidencing or giving rise to such property, except to the extent that such Requirement of Law or the term in
such contract, license, agreement, instrument or other document providing for such prohibition, breach, default or termination or requiring such consent is ineffective under Section 9-406, 9-407, 9-408 or 9-409 of the Code (or any successor provision or provisions) of any relevant jurisdiction or any other applicable law
(including the Bankruptcy Code) or principles of equity; provided, however, that such security interest shall attach immediately at such time as such Requirement of Law is not effective or applicable, or such prohibition, breach, default or
termination is no longer applicable or is waived, and to the extent severable, shall attach immediately to any portion of the Collateral that does not result in such consequences. 

Pursuant to the terms of a certain negative pledge arrangement with Bank, Borrower has agreed not to encumber any of its Intellectual Property
without Bank’s prior written consent. 












 EXHIBIT B 

COMPLIANCE CERTIFICATE 
  

					
	TO:	 	SILICON VALLEY BANK	  	Date:
                                         
           
	FROM:	 	PANDION THERAPEUTICS, INC.	  	

 The undersigned authorized officer of PANDION THERAPEUTICS, INC. (“Borrower”) certifies that under
the terms and conditions of the Loan and Security Agreement between Borrower and Bank (the “Agreement”): 
 (1) Borrower is in
complete compliance for the period ending _______________ with all required covenants except as noted below; (2) there are no Events of Default; (3) all representations and warranties in the Agreement are true and correct in all material
respects on this date except as noted below; provided, however, that such materiality qualifier shall not be applicable to any representations and warranties that already are qualified or modified by materiality in the text thereof; and provided,
further that those representations and warranties expressly referring to a specific date shall be true, accurate and complete in all material respects as of such date; (4) Borrower, and each of its Subsidiaries, has timely filed all required
tax returns and reports, and Borrower has timely paid all foreign, federal, state and local taxes, assessments, deposits and contributions owed by Borrower except as otherwise permitted pursuant to the terms of Section 5.8 of the Agreement; and
(5) no Liens have been levied or claims made against Borrower or any of its Subsidiaries relating to unpaid employee payroll or benefits of which Borrower has not previously provided written notification to Bank. 

Attached are the required documents supporting the certification. The undersigned certifies that these are prepared in accordance with GAAP
consistently applied from one period to the next except as explained in an accompanying letter or footnotes. The undersigned acknowledges that no borrowings may be requested at any time or date of determination that Borrower is not in compliance
with any of the terms of the Agreement, and that compliance is determined not just at the date this certificate is delivered. Capitalized terms used but not otherwise defined herein shall have the meanings given them in the Agreement. 

Please indicate compliance status by circling Yes/No under “Complies” column. 

 

					
	 Reporting Covenants
	  	 Required
	  	 Complies

			
	Monthly financial statements	  	Monthly within 30 days	  	Yes   No
			
	Compliance Certificate	  	Monthly within 30 days	  	Yes   No
			
	Annual financial statement (CPA Audited)	  	FYE within 180 days (commencing with Borrower’s 2018 FYE)	  	Yes   No
			
	Board projections	  	Within the later to occur of (a) FYE within 30 days and (b) 30 days after Board approval, and contemporaneously with any updates or changes thereto	  	Yes   No
			
	10-Q, 10-K and 8-K	  	Within 5 days after filing with SEC	  	Yes   No

 Aggregate amount of all cash balances maintained with ProgramCo     $_____________ 












 Other Matters 
  

					
	Have there been any amendments of or other changes to the capitalization table of Borrower and to the Operating Documents of Borrower or any of its Subsidiaries? If yes, provide copies of any such amendments or changes with this
Compliance Certificate.	  	Yes	  	No

 The following are the exceptions with respect to the certification above: (If no exceptions exist, state
“No exceptions to note.”) 

————————————————————————————————————————————————————————————————————————————————————————————————————————————
 
  

									
	PANDION THERAPEUTICS, INC.	 		 	BANK USE ONLY
					
	By:	 	 	 		 	Received by:	 	 
	Name:	 	 	 		 		 	AUTHORIZED SIGNER
	Title:	 	 	 		 	Date:	 	 
					
		 		 		 	Verified:	 	 
		 		 		 		 	AUTHORIZED SIGNER
					
		 		 		 	Date:	 	 
				
		 		 		 	Compliance Status:    Yes     No













 EXHIBIT C – LOAN PAYMENT/ADVANCE REQUEST FORM 

DEADLINE FOR SAME DAY PROCESSING IS 2:00
PM EASTERN TIME 
  

					
	Fax To:     	  		  	Date: _____________________            

  

					
	LOAN PAYMENT:	  	PANDION THERAPEUTICS, INC.	  	 
	 		 
	From Account #________________________________	  	To Account #_______________________________________	  	 
	 (Deposit Account #)
	  	(Loan Account #)	  	 
	Principal $ ____________________________________	  	and/or Interest $_____________________________________	  	 
	Authorized Signature: ________________________________	  	                  Phone Number: _____________________________	  	 
	Print Name/Title: ___________________________________	  		  	 
	 	  	 	  	 

  

					
	LOAN ADVANCE:	  	 	  	 
	Complete Outgoing Wire Request section below if all or a portion of the funds from this loan advance are for an outgoing wire.	  	 
	From Account #________________________________	  	To Account #__________________________________________________	  	 
	 (Loan Account #)
	  	(Deposit Account #)	  	 
	 Amount of Credit
Extension $___________________________
 All Borrower’s representations and warranties in the Loan and Security Agreement are true, correct and complete
in all material respects on the date of the request for a Credit Extension; provided, however, that such materiality qualifier shall not be applicable to any representations and warranties that already are qualified or modified by materiality in the
text thereof; and provided, further that those representations and warranties expressly referring to a specific date shall be true, accurate and complete in all material respects as of such date:

	 		 
	Authorized Signature: ________________________________	  	                  Phone Number: ________________________________	  	 
	Print Name/Title: ___________________________________	  		  	 
	 	  	 	  	 

  

					
	 OUTGOING
WIRE REQUEST:
 Complete only if all or a portion of funds from the loan advance above is to be wired.

Deadline for same day processing is 2:00 pm, Eastern Time
	  	 
	 		 
	Beneficiary Name: ____________________________________	  	                  Amount of Wire: $____________________________________	  	 
	Beneficiary Bank: ____________________________________	  	                  Account Number: ____________________________________	  	 
	City and State: _______________________________________	  		  	 
	Beneficiary Bank Transit (ABA) #: ______________________	  	        Beneficiary Bank Code (Swift, Sort, Chip, etc.): _________________	  	 
	 	  	 (For International Wire Only)
	  	 
	Intermediary Bank: ___________________________________	  	        Transit (ABA) #: _________________________________________	  	 
	For Further Credit to: _______________________________________________________________________________________________________________	  	 
	Special Instruction: _________________________________________________________________________________________________________________	  	 
	  

By signing below, I (we) acknowledge and agree that my (our) funds transfer request shall be processed in accordance with and subject to the terms and
conditions set forth in the agreements(s) covering funds transfer service(s), which agreements(s) were previously received and executed by me (us).

	 	  		  	 
	Authorized Signature: ___________________________	  	2nd Signature (if required): _______________________________	  	 
	Print Name/Title: ______________________________	  	Print Name/Title: ______________________________________	  	 
	 Telephone #: _________________________________

 
	  	 Telephone #: _________________________________________