Document:

EX-4.3

 Exhibit 4.3 
 SYNAGEVA BIOPHARMA CORP. 
 (f/k/a AviGenics, inc.) 

2005 STOCK PLAN 
 1. Purposes of the Plan. The purposes of this 2005 Stock Plan are to attract and retain the best available personnel for positions of substantial responsibility, to provide additional
incentive to Employees and Consultants and to promote the success of the Company’s business. Options granted under the Plan may be Incentive Stock Options or Nonstatutory Stock Options, as determined by the Administrator at the time of grant of
an option and subject to the applicable provisions of Section 422 of the Code and the regulations and interpretations promulgated thereunder. Stock purchase rights may also be granted under the Plan. 

2. Definitions. As used herein, the following definitions shall apply: 

(a) “Administrator” means the Board or its Committee appointed pursuant to Section 4 of the Plan.

 (b) “Affiliate” means an entity other than a Subsidiary (as defined below) which, together with the
Company, is under common control of a third person or entity. 
 (c) “Applicable Laws” means the legal
requirements relating to the administration of stock option and restricted stock purchase plans, including under applicable U.S. state corporate laws, U.S. federal and applicable state securities laws, other U.S. federal and state laws, the Code,
any Stock Exchange rules or regulations and the applicable laws, rules and regulations of any other country or jurisdiction where Options or Stock Purchase Rights are granted under the Plan, as such laws, rules, regulations and requirements shall be
in place from time to time. 
 (d) “Board” means the Board of Directors of the Company. 

(e) “Cause” for termination of a Participant’s Continuous Service Status will exist if the
Participant is terminated by the Company for any of the following reasons: (i) Participant’s willful failure substantially to perform his or her duties and responsibilities to the Company or deliberate violation of a Company policy;
(ii) Participant’s commission of any act of fraud, embezzlement, dishonesty or any other willful misconduct that has caused or is reasonably expected to result in material injury to the Company; (iii) unauthorized use or disclosure by
Participant of any proprietary information or trade secrets of the Company or any other party to whom the Participant owes an obligation of nondisclosure as a result of his or her relationship with the Company; or (iv) Participant’s
willful breach of any of his or her obligations under any written agreement or covenant with the Company. The determination as to whether a Participant is being terminated for Cause shall be made in good faith by the Company and shall be final and
binding on the Participant. The foregoing definition does not in any way limit the Company’s ability to terminate a Participant’s employment or consulting relationship at any time as provided in Section 5(d) below, and the term
“Company” will be interpreted to include any Subsidiary, Parent or Affiliate, as appropriate. 
 (f)
“Change of Control” means (1) a sale of all or substantially all of the Company’s assets, or (2) any merger, consolidation or other business combination transaction of the Company with or into
another corporation, entity or person, other than a transaction in which the holders of at least a majority of the shares of voting capital stock of the Company outstanding immediately prior to such transaction continue to hold (either by such
shares remaining outstanding or by their being converted into shares of voting capital stock of the surviving entity) a majority of the total voting power represented by the shares of voting capital stock of the Company (or the surviving entity)
outstanding immediately after such transaction, or (3) the direct or indirect acquisition (including by way of a tender or exchange offer) by any person, or persons acting as a group, of beneficial

 
ownership or a right to acquire beneficial ownership of shares representing a majority of the voting power of the then outstanding shares of capital stock of the Company. Notwithstanding the
foregoing, a Change of Control shall not be deemed to occur (A) on account of the acquisition of shares of voting capital stock by any institutional investor or any affiliate thereof or any other person, or persons acting as a group, that
acquires the Company’s shares of voting capital stock in a transaction or series of related transactions that are primarily a private financing transaction for the Company or (B) solely because the level of ownership held by any
institutional investor or any affiliate thereof or any other person, or persons acting as a group (the “Subject Person”), exceeds the designated percentage threshold of the outstanding shares of voting capital stock as a result of a
repurchase or other acquisition of shares of voting capital stock by the Company reducing the number of shares outstanding, provided that if a Change of Control would occur (but for the operating of this sentence) as a result of the acquisition of
shares of voting capital stock by the Company, and after such share acquisition, the Subject Person becomes the owner of any additional shares of voting capital stock that, assuming the repurchase or other acquisition had not occurred, increases the
percentage of the then outstanding shares of voting capital stock owned by such Subject Person over the designated percentage threshold, then a Change of Control shall be deemed to occur. 

(g) “Code” means the Internal Revenue Code of 1986, as amended. 

(h) “Committee” means one or more committees or subcommittees of the Board appointed by the Board to administer
the Plan in accordance with Section 4 below. 
 (i) “Common Stock” means the Common Stock of the
Company. 
 (j) “Company” means Synageva BioPharma Corp., a Delaware corporation. 

(k) “Consultant” means any person, including an advisor, who is engaged by the Company or any Parent, Subsidiary
or Affiliate to render services and is compensated for such services, and any director of the Company whether compensated for such services or not. 
 (l) “Continuous Service Status” means the absence of any interruption or termination of service as an Employee or Consultant. Continuous Service Status as an Employee or Consultant
shall not be considered interrupted in the case of: (i) sick leave; (ii) military leave; (iii) any other leave of absence approved by the Administrator, provided that such leave is for a period of not more than ninety (90) days,
unless reemployment upon the expiration of such leave is guaranteed by contract or statute, or unless provided otherwise pursuant to Company policy adopted from time to time; or (iv) in the case of transfers between locations of the Company or
between the Company, its Parents, Subsidiaries, Affiliates or their respective successors. A change in status from an Employee to a Consultant or from a Consultant to an Employee will not constitute an interruption of Continuous Service Status.

 (m) “Corporate Transaction” means a sale of all or substantially all of the Company’s assets, or
a merger, consolidation or other capital reorganization or business combination transaction of the Company with or into another corporation, entity or person, or the direct or indirect acquisition (including by way of a tender or exchange offer) by
any person, or persons acting as a group, of beneficial ownership or a right to acquire beneficial ownership of shares representing a majority of the voting power of the then outstanding shares of capital stock of the Company. 

(n) “Director” means a member of the Board. 

(o) “Employee” means any person employed by the Company or any Parent, Subsidiary or Affiliate, with the status
of employment determined based upon such factors as are deemed appropriate by the Administrator in its discretion, subject to any requirements of the Code or the Applicable Laws. The payment by the Company of a director’s fee to a Director
shall not be sufficient to constitute “employment” of such Director by the Company. 

 (p) “Exchange Act” means the Securities Exchange Act of 1934, as
amended. 
 (q) “Fair Market Value” means, as of any date, the fair market value of the Common Stock, as
determined by the Administrator in good faith on such basis as it deems appropriate and applied consistently with respect to Participants. Whenever possible, the determination of Fair Market Value shall be based upon the closing price for the Shares
as reported in the Wall Street Journal for the applicable date. 
 (r) “Incentive Stock Option”
means an Option intended to qualify as an incentive stock option within the meaning of Section 422 of the Code, as designated in the applicable Option Agreement. 
 (t) “Listed Security” means any security of the Company that is listed or approved for listing on a national securities exchange or designated or approved for
designation as a national market system security on an interdealer quotation system by the National Association of Securities Dealers, Inc. 
 (u) “Named Executive” means any individual who, on the last day of the Company’s fiscal year, is the chief executive officer of the Company (or is acting in such capacity) or
among the four most highly compensated officers of the Company (other than the chief executive officer). Such officer status shall be determined pursuant to the executive compensation disclosure rules under the Exchange Act. 

(v) “Nonstatutory Stock Option” means an Option not intended to qualify as an Incentive Stock Option, as
designated in the applicable Option Agreement. 
 (w) “Option” means a stock option granted pursuant to
the Plan. 
 (x) “Option Agreement” means a written document, the form(s) of which shall be approved
from time to time by the Administrator, reflecting the terms of an Option granted under the Plan and includes any documents attached to or incorporated into such Option Agreement, including, but not limited to, a notice of stock option grant and a
form of exercise notice. 
 (y) “Option Exchange Program” means a program approved by the Administrator
whereby outstanding Options are exchanged for Options with a lower exercise price or are amended to decrease the exercise price as a result of a decline in the Fair Market Value of the Common Stock. 

(z) “Optioned Stock” means the Common Stock subject to an Option. 

(aa) “Optionee” means an Employee or Consultant who receives an Option. 

(bb) “Parent” means a “parent corporation,” whether now or hereafter existing, as defined in
Section 424(e) of the Code, or any successor provision. 
 (cc) “Participant” means any holder of
one or more Options or Stock Purchase Rights, or the Shares issuable or issued upon exercise of such awards, under the Plan. 

(dd) “Plan” means this 2005 Stock Plan. 
 (ee) “Reporting Person” means an officer, Director, or greater than ten percent stockholder of the Company within the meaning of Rule 16a-2 under the Exchange Act, who is required
to file reports pursuant to Rule 16a-3 under the Exchange Act. 
 (ff) “Restricted Stock” means Shares
of Common Stock acquired pursuant to a grant of a Stock Purchase Right under Section 10 below. 
 (gg)
“Restricted Stock Purchase Agreement” means a written document, the form(s) of which shall be approved from time to time by the Administrator, reflecting the terms of a Stock Purchase Right granted under the Plan and includes
any documents attached to such agreement. 

 (hh) “Rule 16b-3” means Rule 16b-3 promulgated under the Exchange
Act, as amended from time to time, or any successor provision. 
 (ii) “Share” means a share of the
Common Stock, as adjusted in accordance with Section 13 of the Plan. 
 (jj) “Stock Exchange” means
any stock exchange or consolidated stock price reporting system on which prices for the Common Stock are quoted at any given time. 
 (kk) “Stock Purchase Right” means the right to purchase Common Stock pursuant to Section 10 below. 
 (ll) “Subsidiary” means a “subsidiary corporation,” whether now or hereafter existing, as defined in Section 424(f) of the Code, or any successor provision.

 (mm) “Ten Percent Holder” means a person who owns stock representing more than ten percent
(10%) of the voting power of all classes of stock of the Company or any Parent or Subsidiary. 
 3. Stock Subject to
the Plan. Subject to the provisions of Section 13 of the Plan, the maximum aggregate number of Shares that may be sold under the Plan is 4,928,715 Shares of Common Stock. The Shares may be authorized, but unissued, or reacquired Common
Stock. If an award should expire or become unexercisable for any reason without having been exercised in full, or is surrendered pursuant to an Option Exchange Program, the unpurchased Shares that were subject thereto shall, unless the Plan shall
have been terminated, become available for future grant under the Plan. In addition, any Shares of Common Stock which are retained by the Company upon exercise of an award in order to satisfy the exercise or purchase price for such award or any
withholding taxes due with respect to such exercise or purchase shall be treated as not issued and shall continue to be available under the Plan. Shares issued under the Plan and later repurchased by the Company pursuant to any repurchase right
which the Company may have shall be available for future grant under the Plan. 
 4. Administration of the
Plan. 
 (a) General. The Plan shall be administered by the Board or a Committee, or a combination
thereof, as determined by the Board. The Plan may be administered by different administrative bodies with respect to different classes of Participants and, if permitted by the Applicable Laws, the Board may authorize one or more officers to make
awards under the Plan. 
 (b) Committee Composition. If a Committee has been appointed pursuant to this
Section 4, such Committee shall continue to serve in its designated capacity until otherwise directed by the Board. From time to time the Board may increase the size of any Committee and appoint additional members thereof, remove members (with
or without cause) and appoint new members in substitution therefor, fill vacancies (however caused) and remove all members of a Committee and thereafter directly administer the Plan, all to the extent permitted by the Applicable Laws and, in the
case of a Committee administering the Plan in accordance with the requirements of Rule 16b-3 or Section 162(m) of the Code, to the extent permitted or required by such provisions. The Committee shall in all events conform to any requirements of
the Applicable Laws. 
 (c) Powers of the Administrator. Subject to the provisions of the Plan and in the case of
a Committee, the specific duties delegated by the Board to such Committee, the Administrator shall have the authority, in its discretion: 
 (i) to determine the Fair Market Value of the Common Stock, in accordance with Section 2(q) of the Plan, provided that such determination shall be applied consistently with respect to Participants
under the Plan; 

 (ii) to select the Employees and Consultants to whom Plan awards may from time to time be
granted; 
 (iii) to determine whether and to what extent Plan awards are granted; 

(iv) to determine the number of Shares of Common Stock to be covered by each award granted; 

(v) to approve the form(s) of agreement(s) used under the Plan; 

(vi) to determine the terms and conditions, not inconsistent with the terms of the Plan, of any award granted hereunder, which terms and
conditions include but are not limited to the exercise or purchase price, the time or times when awards may be exercised (which may be based on performance criteria), any vesting acceleration or waiver of forfeiture restrictions, any pro rata
adjustment to vesting as a result of a Participant’s transitioning from full- to part-time service (or vice versa), and any restriction or limitation regarding any Option, Optioned Stock, Stock Purchase Right or Restricted Stock, based in each
case on such factors as the Administrator, in its sole discretion, shall determine; 
 (vii) to determine whether and under
what circumstances an Option may be settled in cash under Section 8(b) instead of Common Stock; 
 (viii) to implement an
Option Exchange Program on such terms and conditions as the Administrator in its discretion deems appropriate, provided that no amendment or adjustment to an Option that would materially and adversely affect the rights of any Optionee shall be made
without the prior written consent of the Optionee; 
 (ix) to adjust the vesting of an Option held by an Employee or Consultant
as a result of a change in the terms or conditions under which such person is providing services to the Company; 
 (x) to
construe and interpret the terms of the Plan and awards granted under the Plan, which constructions, interpretations and decisions shall be final and binding on all Participants; and 

(xi) in order to fulfill the purposes of the Plan and without amending the Plan, to modify grants of Options or Stock Purchase Rights to
Participants who are foreign nationals or employed outside of the United States in order to recognize differences in local law, tax policies or customs. 
 5. Eligibility. 
 (a) Recipients of Grants.
Nonstatutory Stock Options and Stock Purchase Rights may be granted to Employees and Consultants. Incentive Stock Options may be granted only to Employees, provided that Employees of Affiliates shall not be eligible to receive Incentive Stock
Options. 
 (b) Type of Option. Each Option shall be designated in the Option Agreement as either an Incentive
Stock Option or a Nonstatutory Stock Option. 
 (c) ISO $100,000 Limitation. Notwithstanding any designation under
Section 5(b), to the extent that the aggregate Fair Market Value of Shares with respect to which Options designated as Incentive Stock Options are exercisable for the first time by any Optionee during any calendar year (under all plans of the
Company or any Parent or Subsidiary) exceeds $100,000, such excess Options shall be treated as Nonstatutory Stock Options. For purposes of this Section 5(c), Incentive Stock Options shall be taken into account in the order in which they were
granted, and the Fair Market Value of the Shares subject to an Incentive Stock Option shall be determined as of the date of the grant of such Option. 

 (d) No Employment Rights. The Plan shall not confer upon any Participant any
right with respect to continuation of an employment or consulting relationship with the Company, nor shall it interfere in any way with such Participant’s right or the Company’s right to terminate the employment or consulting relationship
at any time for any reason. 
 6. Term of Plan. The Plan shall become effective upon its adoption by the Board of
Directors. It shall continue in effect for a term of ten (10) years unless sooner terminated under Section 15 of the Plan. 
 7. Term of Option. The term of each Option shall be the term stated in the Option Agreement; provided that the term shall be no more than ten years from the date of grant thereof or
such shorter term as may be provided in the Option Agreement and provided further that, in the case of an Incentive Stock Option granted to a person who at the time of such grant is a Ten Percent Holder, the term of the Option shall be five years
from the date of grant thereof or such shorter term as may be provided in the Option Agreement. 
 8. Option Exercise
Price and Consideration. 
 (a) Exercise Price. The per Share exercise price for the Shares to be
issued pursuant to exercise of an Option shall be such price as is determined by the Administrator and set forth in the Option Agreement, but shall be subject to the following: 

(i) In the case of an Incentive Stock Option 
 (A) granted to an Employee who at the time of grant is a Ten Percent Holder, the per Share exercise price shall be no less than 110% of the Fair Market Value per Share on the date of grant; or 

(B) granted to any other Employee, the per Share exercise price shall be no less than 100% of the Fair Market Value per Share on the
date of grant. 
 (ii) In the case of a Nonstatutory Stock Option 

(A) granted on any date on which the Common Stock is not a Listed Security to a person who is at the time of grant is a Ten Percent
Holder, the per Share exercise price shall be no less than 110% of the Fair Market Value per Share on the date of grant if required by the Applicable Laws and, if not so required, shall be such price as is determined by the Administrator;

 (B) granted on any date on which the Common Stock is not a Listed Security to any other eligible person, the per Share
exercise price shall be no less than 85% of the Fair Market Value per Share on the date of grant if required by the Applicable Laws and, if not so required, shall be such price as is determined by the Administrator; or 

(C) granted on any date on which the Common Stock is a Listed Security to any eligible person, the per share Exercise Price shall be
such price as determined by the Administrator provided that if such eligible person is, at the time of the grant of such Option, a Named Executive of the Company, the per share Exercise Price shall be no less than 100% of the Fair Market Value on
the date of grant if such Option is intended to qualify as performance-based compensation under Section 162(m) of the Code. 
 (iii) Notwithstanding the foregoing, Options may be granted with a per Share exercise price other than as required above pursuant to a merger or other corporate transaction. 

(b) Permissible Consideration. The consideration to be paid for the Shares to be issued upon exercise of an Option,
including the method of payment, shall be determined by the Administrator (and, in the case of an Incentive Stock Option, shall be determined at the time of grant) and may consist entirely of (1) cash; (2) check; (3) subject to any
requirements of the Applicable Laws (including without limitation Section 153 of the Delaware 

 
General Corporation Law), delivery of Optionee’s promissory note having such recourse, interest, security and redemption provisions as the Administrator determines to be appropriate after
taking into account the potential accounting consequences of permitting an Optionee to deliver a promissory note; (4) cancellation of indebtedness; (5) other Shares that have a Fair Market Value on the date of surrender equal to the
aggregate exercise price of the Shares as to which the Option is exercised, provided that in the case of Shares acquired, directly or indirectly, from the Company, such Shares must have been owned by the Optionee for more than six months on the date
of surrender (or such other period as may be required to avoid the Company’s incurring an adverse accounting charge); (6) if, as of the date of exercise of an Option the Company then is permitting employees to engage in a “same-day
sale” cashless brokered exercise program involving one or more brokers, through such a program that complies with the Applicable Laws (including without limitation the requirements of Regulation T and other applicable regulations promulgated by
the Federal Reserve Board) and that ensures prompt delivery to the Company of the amount required to pay the exercise price and any applicable withholding taxes; or (7) any combination of the foregoing methods of payment. In making its
determination as to the type of consideration to accept, the Administrator shall consider if acceptance of such consideration may be reasonably expected to benefit the Company and the Administrator may, in its sole discretion, refuse to accept a
particular form of consideration at the time of any Option exercise. 
 9. Exercise of Option. 

(a) General. 
 (i) Exercisability. Any Option granted hereunder shall be exercisable at such times and under such conditions as determined by the Administrator, consistent with the term of the Plan and
reflected in the Option Agreement, including vesting requirements and/or performance criteria with respect to the Company and/or the Optionee; provided however that, if required under the Applicable Laws, the Option (or Shares issued upon exercise
of the Option) shall comply with the requirements of Section 260.140.41(f) and (k) of the Rules of the California Corporations Commissioner. 
 (ii) Leave of Absence. The Administrator shall have the discretion to determine whether and to what extent the vesting of Options shall be tolled during any unpaid leave of absence;
provided, however, that in the absence of such determination, vesting of Options shall be tolled during any such unpaid leave (unless otherwise required by the Applicable Laws). In the event of military leave, vesting shall toll during any unpaid
portion of such leave, provided that, upon a Participant’s returning from military leave (under conditions that would entitle him or her to protection upon such return under the Uniform Services Employment and Reemployment Rights Act), he or
she shall be given vesting credit with respect to Options to the same extent as would have applied had the Participant continued to provide services to the Company throughout the leave on the same terms as he or she was providing services
immediately prior to such leave. 
 (iii) Minimum Exercise Requirements. An Option may not be exercised for a
fraction of a Share. The Administrator may require that an Option be exercised as to a minimum number of Shares, provided that such requirement shall not prevent an Optionee from exercising the full number of Shares as to which the Option is then
exercisable. 
 (iv) Procedures for and Results of Exercise. An Option shall be deemed exercised when written
notice of such exercise has been given to the Company in accordance with the terms of the Option by the person entitled to exercise the Option and the Company has received full payment for the Shares with respect to which the Option is exercised.
Full payment may, as authorized by the Administrator, consist of any consideration and method of payment allowable under Section 8(b) of the Plan, provided that the Administrator may, in its sole discretion, refuse to accept any form of
consideration at the time of any Option exercise. 
 Exercise of an Option in any manner shall result in a decrease in the
number of Shares that thereafter may be available, both for purposes of the Plan and for sale under the Option, by the number of Shares as to which the Option is exercised. 

 (v) Rights as Stockholder. Until the issuance of the Shares (as evidenced by
the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), no right to vote or receive dividends or any other rights as a stockholder shall exist with respect to the Optioned Stock, notwithstanding the
exercise of the Option. No adjustment will be made for a dividend or other right for which the record date is prior to the date the stock certificate is issued, except as provided in Section 13 of the Plan. 

(b) Termination of Employment or Consulting Relationship. Except as otherwise set forth in this Section 9(b), the
Administrator shall establish and set forth in the applicable Option Agreement the terms and conditions upon which an Option shall remain exercisable, if at all, following termination of an Optionee’s Continuous Service Status, which provisions
may be waived or modified by the Administrator at any time. Unless the Administrator otherwise provides in the Option Agreement, to the extent that the Optionee is not vested in Optioned Stock at the date of termination of his or her Continuous
Service Status, or if the Optionee (or other person entitled to exercise the Option) does not exercise the Option to the extent so entitled within the time specified in the Option Agreement or below (as applicable), the Option shall terminate and
the Optioned Stock underlying the unexercised portion of the Option shall revert to the Plan. In no event may any Option be exercised after the expiration of the Option term as set forth in the Option Agreement (and subject to Section 7).

 The following provisions (1) shall apply to the extent an Option Agreement does not specify the terms and conditions
upon which an Option shall terminate upon termination of an Optionee’s Continuous Service Status, and (2) establish the minimum post-termination exercise periods that may be set forth in an Option Agreement: 

(i) Termination other than Upon Disability or Death. In the event of termination of Optionee’s Continuous Service
Status other than under the circumstances set forth in subsections (ii) through (iv) below, such Optionee may exercise an Option for 30 days following such termination to the extent the Optionee was vested in the Optioned Stock as of the
date of such termination. No termination shall be deemed to occur and this Section 9(b)(i) shall not apply if (i) the Optionee is a Consultant who becomes an Employee, or (ii) the Optionee is an Employee who becomes a Consultant.

 (ii) Disability of Optionee. In the event of termination of an Optionee’s Continuous Service Status as a
result of his or her disability (including a disability within the meaning of Section 22(e)(3) of the Code), such Optionee may exercise an Option at any time within six months following such termination to the extent the Optionee was vested in
the Optioned Stock as of the date of such termination. 
 (iii) Death of Optionee. In the event of the death of
an Optionee during the period of Continuous Service Status since the date of grant of the Option, or within thirty days following termination of Optionee’s Continuous Service Status, the Option may be exercised by Optionee’s estate or by a
person who acquired the right to exercise the Option by bequest or inheritance at any time within twelve months following the date of death, but only to the extent the Optionee was vested in the Optioned Stock as of the date of death or, if earlier,
the date the Optionee’s Continuous Service Status terminated. 
 (iv) Termination for Cause. In the
event of termination of an Optionee’s Continuous Service Status for Cause, any Option (including any exercisable portion thereof) held by such Optionee shall immediately terminate in its entirety upon first notification to the Optionee of
termination of the Optionee’s Continuous Service Status. If an Optionee’s employment or consulting relationship with the Company is suspended pending an investigation of whether the Optionee shall be terminated for Cause, all the
Optionee’s rights under any Option likewise shall be suspended during the investigation period and the Optionee shall have no right to exercise any Option. This Section 9(b)(iv) shall apply with equal effect to vested Shares acquired upon
exercise of an Option granted on any date on which the Common Stock is not a Listed Security to a person other than an officer, Director or Consultant, in that the Company shall have the right to repurchase such Shares from the Participant upon the
following terms: (A) the repurchase is made within 90 days of termination of the Participant’s Continuous Service Status for Cause at the Fair Market Value of the Shares as of the date of

 
termination, (B) consideration for the repurchase consists of cash or cancellation of purchase money indebtedness, and (C) the repurchase right terminates upon the effective date of the
Company’s initial public offering of its Common Stock. With respect to vested Shares issued upon exercise of an Option granted to any officer, Director or Consultant, the Company’s right to repurchase such Shares upon termination of the
Participant’s Continuous Service Status for Cause shall be made at the Participant’s original cost for the Shares and shall be effected pursuant to such terms and conditions, and at such time, as the Administrator shall determine. Nothing
in this Section 9(b)(iv) shall in any way limit the Company’s right to purchase unvested Shares issued upon exercise of an Option as set forth in the applicable Option Agreement. 

(c) Buyout Provisions. The Administrator may at any time offer to buy out for a payment in cash or Shares an Option
previously granted under the Plan based on such terms and conditions as the Administrator shall establish and communicate to the Optionee at the time that such offer is made. 
 10. Stock Purchase Rights. 
 (a) Rights to
Purchase. When the Administrator determines that it will offer Stock Purchase Rights under the Plan, it shall advise the offeree in writing of the terms, conditions and restrictions related to the offer, including the number of Shares that
such person shall be entitled to purchase, the price to be paid, and the time within which such person must accept such offer. In the case of a Stock Purchase Right granted prior to the date, if any, on which the Common Stock becomes a Listed
Security and if required by the Applicable Laws at that time, the purchase price of Shares subject to such Stock Purchase Rights shall not be less than 85% of the Fair Market Value of the Shares as of the date of the offer, or, in the case of a Ten
Percent Holder, the price shall not be less than 100% of the Fair Market Value of the Shares as of the date of the offer. If the Applicable Laws do not impose the requirements set forth in the preceding sentence and with respect to any Stock
Purchase Rights granted after the date, if any, on which the Common Stock becomes a Listed Security, the purchase price of Shares subject to Stock Purchase Rights shall be as determined by the Administrator. The offer to purchase Shares subject to
Stock Purchase Rights shall be accepted by execution of a Restricted Stock Purchase Agreement in the form determined by the Administrator. 
 (b) Repurchase Option. 
 (i) General. Unless
the Administrator determines otherwise, the Restricted Stock Purchase Agreement shall grant the Company a repurchase option exercisable upon the voluntary or involuntary termination of the purchaser’s employment with the Company for any reason
(including death or disability). Subject to any requirements of the Applicable Laws (including without limitation Section 260.140.42(h) of the Rules of the California Corporations Commissioner), the terms of the Company’s repurchase option
(including without limitation the price at which, and the consideration for which, it may be exercised, and the events upon which it shall lapse) shall be as determined by the Administrator in its sole discretion and reflected in the Restricted
Stock Purchase Agreement. 
 (ii) Leave of Absence. The Administrator shall have the discretion to determine
whether and to what extent the lapsing of Company repurchase rights shall be tolled during any unpaid leave of absence; provided, however, that in the absence of such determination, such lapsing shall be tolled during any such unpaid leave (unless
otherwise required by the Applicable Laws). In the event of military leave, the lapsing of Company repurchase rights shall toll during any unpaid portion of such leave, provided that, upon a Participant’s returning from military leave (under
conditions that would entitle him or her to protection upon such return under the Uniform Services Employment and Reemployment Rights Act), he or she shall be given “vesting” credit with respect to Shares purchased pursuant to the
Restricted Stock Purchase Agreement to the same extent as would have applied had the Participant continued to provide services to the Company throughout the leave on the same terms as he or she was providing services immediately prior to such leave.

 (iii) Termination for Cause. In the event of termination of a Participant’s Continuous Service
Status for Cause, the Company shall have the right to repurchase from the Participant vested Shares issued upon 

 
exercise of a Stock Purchase Right granted to any person other than an officer, Director or Consultant prior to the date, if any, upon which the Common Stock becomes a Listed Security upon the
following terms: (A) the repurchase must be made within 90 days of termination of the Participant’s Continuous Service Status for Cause at the Fair Market Value of the Shares as of the date of termination, (B) consideration for the
repurchase consists of cash or cancellation of purchase money indebtedness, and (C) the repurchase right terminates upon the effective date of the Company’s initial public offering of its Common Stock. With respect to vested Shares issued
upon exercise of a Stock Purchase Right granted to any officer, Director or Consultant, the Company’s right to repurchase such Shares upon termination of such Participant’s Continuous Service Status for Cause shall be made at the
Participant’s original cost for the Shares and shall be effected pursuant to such terms and conditions, and at such time, as the Administrator shall determine. Nothing in this Section 10(b)(ii) shall in any way limit the Company’s
right to purchase unvested Shares as set forth in the applicable Restricted Stock Purchase Agreement. 
 (c) Other
Provisions. The Restricted Stock Purchase Agreement shall contain such other terms, provisions and conditions not inconsistent with the Plan as may be determined by the Administrator in its sole discretion. In addition, the provisions of
Restricted Stock Purchase Agreements need not be the same with respect to each purchaser. 
 (d) Rights as a
Stockholder. Once the Stock Purchase Right is exercised, the purchaser shall have the rights equivalent to those of a stockholder, and shall be a stockholder when his or her purchase is entered upon the records of the duly authorized
transfer agent of the Company. No adjustment will be made for a dividend or other right for which the record date is prior to the date the Stock Purchase Right is exercised, except as provided in Section 13 of the Plan. 

11. Taxes. 
 (a) As a condition of the grant, vesting or exercise of an Option or Stock Purchase Right granted under the Plan, the Participant (or in the case of the Participant’s death, the person exercising the
Option or Stock Purchase Right) shall make such arrangements as the Administrator may require for the satisfaction of any applicable federal, state, local or foreign withholding tax obligations that may arise in connection with such grant, vesting
or exercise of the Option or Stock Purchase Right or the issuance of Shares. The Company shall not be required to issue any Shares under the Plan until such obligations are satisfied. If the Administrator allows the withholding or surrender of
Shares to satisfy a Participant’s tax withholding obligations under this Section 11 (whether pursuant to Section 9(c) or (d), or otherwise), the Administrator shall not allow Shares to be withheld in an amount that exceeds the minimum
statutory withholding rates for federal and state tax purposes, including payroll taxes. 
 (b) In the case of an Employee and
in the absence of any other arrangement, the Employee shall be deemed to have directed the Company to withhold or collect from his or her compensation an amount sufficient to satisfy such tax obligations from the next payroll payment otherwise
payable after the date of an exercise of the Option or Stock Purchase Right. 
 (c) This Section 11(c) shall apply only
after the date, if any, upon which the Common Stock becomes a Listed Security. In the case of Participant other than an Employee (or in the case of an Employee where the next payroll payment is not sufficient to satisfy such tax obligations, with
respect to any remaining tax obligations), in the absence of any other arrangement and to the extent permitted under the Applicable Laws, the Participant shall be deemed to have elected to have the Company withhold from the Shares to be issued upon
exercise of the Option or Stock Purchase Right that number of Shares having a Fair Market Value determined as of the applicable Tax Date (as defined below) equal to the amount required to be withheld. For purposes of this Section 11, the Fair
Market Value of the Shares to be withheld shall be determined on the date that the amount of tax to be withheld is to be determined under the Applicable Laws (the “Tax Date”). 

 (d) If permitted by the Administrator, in its discretion, a Participant may satisfy his or
her tax withholding obligations upon exercise of an Option or Stock Purchase Right by surrendering to the Company Shares that have a Fair Market Value determined as of the applicable Tax Date equal to the amount required to be withheld. In the case
of shares previously acquired from the Company that are surrendered under this Section 11(d), such Shares must have been owned by the Participant for more than six (6) months on the date of surrender (or such other period of time as is
required for the Company to avoid adverse accounting charges). 
 (e) Any election or deemed election by a Participant to have
Shares withheld to satisfy tax withholding obligations under Section 11(c) or (d) above shall be irrevocable as to the particular Shares as to which the election is made and shall be subject to the consent or disapproval of the
Administrator. Any election by a Participant under Section 11(d) above must be made on or prior to the applicable Tax Date. 
 (f) In the event an election to have Shares withheld is made by a Participant and the Tax Date is deferred under Section 83 of the Code because no election is filed under Section 83(b) of the
Code, the Participant shall receive the full number of Shares with respect to which the Option or Stock Purchase Right is exercised but such Participant shall be unconditionally obligated to tender back to the Company the proper number of Shares on
the Tax Date. 
 12. Non-Transferability of Options and Stock Purchase Rights. 

(a) General. Except as set forth in this Section 12, Options and Stock Purchase Rights may not be sold, pledged,
assigned, hypothecated, transferred or disposed of in any manner other than by will or by the laws of descent or distribution. The designation of a beneficiary by an Optionee will not constitute a transfer. An Option or Stock Purchase Right may be
exercised, during the lifetime of the holder of an Option or Stock Purchase Right, only by such holder or a transferee permitted by this Section 12. 
 (b) Limited Transferability Rights. Notwithstanding anything else in this Section 12, the Administrator may in its discretion grant Nonstatutory Stock Options that may be transferred by
instrument to an inter vivos or testamentary trust in which the Options are to be passed to beneficiaries upon the death of the trustor (settlor) or by gift or pursuant to domestic relations orders to “Immediate Family Members” (as defined
below) of the Optionee. “Immediate Family” means any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law,
brother-in-law, or sister-in-law (including adoptive relationships), a trust in which these persons have more than fifty percent of the beneficial interest, a foundation in which these persons (or the Optionee) control the management of assets, and
any other entity in which these persons (or the Optionee) own more than fifty percent of the voting interests. 
 13.
Adjustments Upon Changes in Capitalization, Merger or Certain Other Transactions. 
 (a) Changes in
Capitalization. Subject to any action required under Applicable Laws by the stockholders of the Company, the number of Shares of Common Stock covered by each outstanding award, and the number of Shares of Common Stock that have been
authorized for issuance under the Plan but as to which no awards have yet been granted or that have been returned to the Plan upon cancellation or expiration of an award, as well as the price per Share of Common Stock covered by each such
outstanding award, shall be proportionately adjusted for any increase or decrease in the number of issued Shares of Common Stock resulting from a stock split, reverse stock split, stock dividend, combination, recapitalization or reclassification of
the Common Stock, or any other increase or decrease in the number of issued Shares of Common Stock effected without receipt of consideration by the Company; provided, however, that conversion of any convertible securities of the Company shall not be
deemed to have been “effected without receipt of consideration.” Such adjustment shall be made by the Administrator, whose determination in that respect shall be final, binding and conclusive. Except as expressly provided herein, no
issuance by the Company of shares of stock of any class, or securities convertible into shares of stock of any class, shall affect, and no adjustment by reason thereof shall be made with respect to, the number or price of Shares of Common Stock
subject to an award. 

 (b) Dissolution or Liquidation. In the event of the dissolution or liquidation
of the Company, each Option and Stock Purchase Right will terminate immediately prior to the consummation of such action, unless otherwise determined by the Administrator. 
 (c) Corporate Transaction. In the event of a Corporate Transaction (including without limitation a Change of Control), unless otherwise determined by the Board of Directors or provided in
the Option Agreement, each outstanding Option or Stock Purchase Right shall be assumed or an equivalent option or right shall be substituted by such successor corporation or a parent or subsidiary of such successor corporation (the
“Successor Corporation”), unless the Successor Corporation does not agree to assume the award or to substitute an equivalent option or right, in which case such Option or Stock Purchase Right shall terminate upon the consummation of
the transaction. 
 For purposes of this Section 13(c), an Option or a Stock Purchase Right shall be considered assumed,
without limitation, if, at the time of issuance of the stock or other consideration upon a Corporate Transaction or a Change of Control, as the case may be, each holder of an Option or Stock Purchase Right would be entitled to receive upon exercise
of the award the same number and kind of shares of stock or the same amount of property, cash or securities as such holder would have been entitled to receive upon the occurrence of the transaction if the holder had been, immediately prior to such
transaction, the holder of the number of Shares of Common Stock covered by the award at such time (after giving effect to any adjustments in the number of Shares covered by the Option or Stock Purchase Right as provided for in this Section 13);
provided that if such consideration received in the transaction is not solely common stock of the Successor Corporation, the Administrator may, with the consent of the Successor Corporation, provide for the consideration to be received upon exercise
of the award to be solely common stock of the Successor Corporation equal to the Fair Market Value of the per Share consideration received by holders of Common Stock in the transaction. 

(d) Certain Distributions. In the event of any distribution to the Company’s stockholders of securities of any other
entity or other assets (other than dividends payable in cash or stock of the Company) without receipt of consideration by the Company, the Administrator may, in its discretion, appropriately adjust the price per Share of Common Stock covered by each
outstanding Option or Stock Purchase Right to reflect the effect of such distribution. 
 14. Time of Granting Options and
Stock Purchase Rights. The date of grant of an Option or Stock Purchase Right shall, for all purposes, be the date on which the Administrator makes the determination granting such Option or Stock Purchase Right, or such other date as is
determined by the Administrator, provided that in the case of any Incentive Stock Option, the grant date shall be the later of the date on which the Administrator makes the determination granting such Incentive Stock Option or the date of
commencement of the Optionee’s employment relationship with the Company. Notice of the determination shall be given to each Employee or Consultant to whom an Option or Stock Purchase Right is so granted within a reasonable time after the date
of such grant. 
 15. Amendment and Termination of the Plan. 

(a) Authority to Amend or Terminate. The Board may at any time amend, alter, suspend or discontinue the Plan, but no
amendment, alteration, suspension or discontinuation (other than an adjustment pursuant to Section 13 above) shall be made that would materially and adversely affect the rights of any Optionee or holder of Stock Purchase Rights under any
outstanding grant, without his or her consent. In addition, to the extent necessary and desirable to comply with the Applicable Laws, the Company shall obtain stockholder approval of any Plan amendment in such a manner and to such a degree as
required. 
 (b) Effect of Amendment or Termination. Except as to amendments which the Administrator has the
authority under the Plan to make unilaterally, no amendment or termination of the Plan shall materially and adversely affect Options or Stock Purchase Rights already granted, unless mutually agreed otherwise between the Optionee or holder of the
Stock Purchase Rights and the Administrator, which agreement must be in writing and signed by the Optionee or holder and the Company. 

 16. Conditions Upon Issuance of Shares. Notwithstanding any other provision of
the Plan or any agreement entered into by the Company pursuant to the Plan, the Company shall not be obligated, and shall have no liability for failure, to issue or deliver any Shares under the Plan unless such issuance or delivery would comply with
the Applicable Laws, with such compliance determined by the Company in consultation with its legal counsel. As a condition to the exercise of an Option or Stock Purchase Right, the Company may require the person exercising the award to represent and
warrant at the time of any such exercise that the Shares are being purchased only for investment and without any present intention to sell or distribute such Shares if, in the opinion of counsel for the Company, such a representation is required by
law. Shares issued upon exercise of awards granted prior to the date on which the Common Stock becomes a Listed Security shall be subject to a right of first refusal in favor of the Company pursuant to which the Participant will be required to offer
Shares to the Company before selling or transferring them to any third party on such terms and subject to such conditions as is reflected in the applicable Option Agreement or Restricted Stock Purchase Agreement. 

17. Reservation of Shares. The Company, during the term of this Plan, will at all times reserve and keep available such
number of Shares as shall be sufficient to satisfy the requirements of the Plan. 
 18. Agreements. Options and
Stock Purchase Rights shall be evidenced by Option Agreements and Restricted Stock Purchase Agreements, respectively, in such form(s) as the Administrator shall from time to time approve. 

19. Stockholder Approval. If required by the Applicable Laws, continuance of the Plan shall be subject to approval by the
stockholders of the Company within twelve (12) months before or after the date the Plan is adopted. Such stockholder approval shall be obtained in the manner and to the degree required under the Applicable Laws. 

20. Information and Documents to Optionees and Purchasers. Prior to the date, if any, upon which the Common Stock becomes a
Listed Security and if required by the Applicable Laws, the Company shall provide financial statements at least annually to each Optionee and to each individual who acquired Shares pursuant to the Plan, during the period such Optionee or purchaser
has one or more Options or Stock Purchase Rights outstanding, and in the case of an individual who acquired Shares pursuant to the Plan, during the period such individual owns such Shares. The Company shall not be required to provide such
information if the issuance of Options or Stock Purchase Rights under the Plan is limited to key employees whose duties in connection with the Company assure their access to equivalent information.EX-4.1

 Exhibit 4.1 
 SUPPLEMENTAL INDENTURE NO. 3 
 SUPPLEMENTAL INDENTURE (this
“Supplemental Indenture”), dated as of June 24, 2013, between Southern Union Company, a Delaware corporation (the “Company”), and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust
Company, N.A.), a national banking association, as trustee (herein called the “Trustee”). 
 WITNESSETH

 WHEREAS, the Company has heretofore executed and delivered to the Trustee an Indenture, dated as of January 31, 1994
(the “Base Indenture”), and an Officers’ Certificate, dated as of January 31, 1994 (the “Officers’ Certificate” and together with the Base Indenture, as heretofore amended or supplemented, the
“Indenture”), providing for the issuance of the Company’s 7.60% Senior Notes due 2024 (the “Notes”); 

WHEREAS, Section 902 of the Indenture provides that, subject to certain conditions, with the consent of the Holders of not less than
a majority in principal amount of all Outstanding Securities of any series, by Act of said Holders delivered to the Company and the Trustee, the Company, when authorized by or pursuant to a Board Resolution, and the Trustee may enter into
supplemental indentures for the purpose of changing in any manner or eliminating any of the provisions of the Indenture which affect such series of Securities or of modifying in any manner the rights of Holders of Securities under the Indenture;

 WHEREAS, Holders of a majority in aggregate principal amount of Notes outstanding have consented to the amendments to the
Indenture set forth below in this Supplemental Indenture; 
 WHEREAS, the Company is undertaking to execute and deliver this
Supplemental Indenture to amend or eliminate certain terms and covenants in this Indenture in connection with the Offering Memorandum and Consent Solicitation Statement of the Company dated as of May 16, 2013, and any amendments, modifications
or supplements thereto (the “Exchange Offer and Consent Solicitation”); 
 WHEREAS, the Company has delivered to the
Trustee an Officers’ Certificate as well as an Opinion of Counsel to the effect that the execution and delivery of this Supplemental Indenture by the Company is authorized or permitted under the Indenture; 

WHEREAS, the Company has been authorized by Board Resolutions to enter into this Supplemental Indenture; 

WHEREAS, all conditions necessary to authorize the execution and delivery of this Supplemental Indenture by the Company and to make this
Supplemental Indenture valid and binding on the Company have been complied with or have been done or performed; and 

 WHEREAS, pursuant to Section 902 of the Indenture, the Trustee is authorized to execute
and deliver this Supplemental Indenture. 
 NOW THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the Company and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 

ARTICLE ONE 

Section 1.01. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the
Indenture. 
 ARTICLE TWO 
 Section 2.01. EFFECTIVENESS OF SUPPLEMENTAL INDENTURE. This Supplemental Indenture shall become effective as of the date hereof provided that the amendments to the Indenture set forth in
Section 2.02, 2.03, 2.04 and 2.05 below shall not become operative unless and until Energy Transfer Partners, L.P., the indirect parent of the Company, consummates the Exchange Offer (as defined in the Exchange Offer and Consent Solicitation)
with respect to the Notes pursuant to the terms and in the manner described in the Exchange Offer and Solicitation. 

Section 2.02. ELIMINATION OF CERTAIN PROVISIONS IN ARTICLE FIVE. 

 

	 	a)	Section 501 (Events of Default), clause (7) (cross-acceleration) of the Indenture is hereby amended by deleting it in its entirety and inserting in lieu
thereof the phrase “[Intentionally Omitted]”. 

  

	 	b)	Section 514 (Waiver of Stay or Extension Laws) of the Indenture is hereby amended by deleting it in its entirety and inserting in lieu thereof the phrase
“[Intentionally Omitted]”. 

 Section 2.03. ELIMINATION OF CERTAIN PROVISIONS IN ARTICLE TEN.

  

	 	a)	Section 1006 (Payment of Taxes and Other Claims) of the Indenture is hereby amended by deleting it in its entirety and inserting in lieu thereof the phrase
“[Intentionally Omitted]”. 

  

	 	b)	Section 1007 (Maintenance of Properties) of the Indenture is hereby amended by deleting it in its entirety and inserting in lieu thereof the phrase
“[Intentionally Omitted]”. 

  

	 	c)	Section 1008 (Corporate Existence) of the Indenture is hereby amended by deleting it in its entirety and inserting in lieu thereof the phrase “[Intentionally
Omitted]”. 

  
 2 

	 	d)	Section 1009 (Limitation on Liens) of the Indenture is hereby amended by deleting it in its entirety and inserting in lieu thereof the phrase “[Intentionally
Omitted]”. 

  

	 	e)	Section 1010 (Limitation on Sale and Leaseback Transactions) of the Indenture is hereby amended by deleting it in its entirety and inserting in lieu thereof the
phrase “[Intentionally Omitted]”. 

 Section 2.04. ELIMINATION OF CERTAIN PROVISIONS IN ARTICLE
FOURTEEN. 
  

	 	a)	Clauses (2), (3), (4), (5), (6) and (7) of Section 1404 (Conditions to Defeasance or Covenant Defeasance) of the Indenture are each hereby amended by
deleting each such clause in its entirety and inserting in lieu thereof the phrase “[Intentionally Omitted]”. 

  

	 	b)	The Notes are hereby deemed to be amended to delete all provisions inconsistent with the amendments to the Indenture effected by this Third Supplemental Indenture.

  

	 	c)	All definitions set forth in Section 101 of the Indenture that relate to defined terms used solely in sections deleted by this Third Supplemental Indenture are
hereby deleted in their entirety. 

 Section 2.05. ELIMINATION OF CERTAIN PROVISION IN THE OFFICERS’
CERTIFICATE. 
  

	 	a)	Section 8(A) (Limitations on Restricted Payments) of the Officers’ Certificate is hereby amended by deleting it in its entirety and inserting in lieu thereof
the phrase “[Intentionally Omitted]”. 

  

	 	b)	Section 8(B) (Restriction on Transfer of Assets) of the Officers’ Certificate is hereby amended by deleting it in its entirety and inserting in lieu thereof
the phrase “[Intentionally Omitted]”. 

  

	 	c)	Section 8(C) (Limitation on Transactions with Affiliates) of the Officers’ Certificate is hereby amended by deleting it in its entirety and inserting in lieu
thereof the phrase “[Intentionally Omitted]”. 

 ARTICLE THREE 

Section 3.01. RATIFICATION OF INDENTURE; SUPPLEMENTAL INDENTURE. Except as expressly amended hereby, the Indenture, as amended or
supplemented by this Supplemental Indenture, is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. Upon the execution and delivery of this Supplemental Indenture by the
Company and the Trustee, this Supplemental Indenture shall form a part of the Indenture for all purposes, and the Company, the Trustee and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. Any and all
references to the Indenture, whether within the Indenture or in any notice, certificate or other instrument or document, shall be deemed to include a reference to this Supplemental Indenture (whether or not made), unless the context shall otherwise
require. 

  
 3 

 Section 3.02. GOVERNING LAW. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 
 Section 3.03. THE TRUSTEE. The Trustee shall not be
responsible in any manner for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals or statements contained herein, all of which are made by the Company and the Trustee assumes no
responsibility for their correctness. 
 Section 3.04. SUCCESSORS. All covenants and agreements of the Trustee in this
Supplemental Indenture shall bind its successors and assigns. All covenants and agreements of the Company in this Supplemental Indenture shall bind its successors and assigns. 
 Section 3.05. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. The
exchange of copies of this Supplemental Indenture and of signature pages by facsimile or electronic format (i.e., “pdf” or “tif”) transmission shall constitute effective execution and delivery of this Supplemental
Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or electronic format (i.e., “pdf” or “tif”)
shall be deemed to be their original signatures for all purposes. 
 Section 3.06. EFFECT OF HEADINGS. The Section headings
herein are for convenience only and shall not affect the construction hereof. 
 Section 3.07. SEVERABILITY. If any
provision in this Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality or enforceability of the remaining provisions of this Supplemental Indenture or the Indenture shall not in any way be affected or impaired
thereby. This Supplemental Indenture is subject to the provisions of the Trust Indenture Act that are required to be part of the Indenture and shall, to the extent applicable, be governed by such provisions. If any provision of this Supplemental
Indenture limits, qualifies or conflicts with another provision hereof which is required to be included herein by any provisions of the Trust Indenture Act, such required provision shall control. 

[Remainder of Page Left Intentionally Blank] 

  
 4 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed and attested, as of the date first above written. 
  

			
	SOUTHERN UNION COMPANY
		
	BY:	 	/s/ Thomas P. Mason
	Name:	 	Thomas P. Mason
	Title:	 	Senior Vice President and General Counsel

  

			
	 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,
 as trustee

		
	BY:	 	/s/ Teresa Petta
	Name:	 	Teresa Petta
	Title:	 	Vice President

 [Signature Page to the Supplemental Indenture] 

  
 5

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