Document:

Exhibit 4.5

 

DESCRIPTION OF THE REGISTRANT’S
SECURITIES

REGISTERED PURSUANT TO SECTION 12 OF
THE SECURITIES

EXCHANGE ACT OF 1934

 

Humanigen, Inc. (“we,” “our,” “us,”
or the “Company”) has the following securities described below registered under Section 12 of the Securities Exchange
Act of 1934, as amended (the “Exchange Act”). The following summary of the terms of our capital stock is based upon
our Amended and Restated Certificate of Incorporation (“Charter”) and our Second Amended and Restated Bylaws (“Bylaws”),
in each case as amended and in effect on the date hereof. This summary does not purport to be complete and is subject to, and is
qualified in its entirety by express reference to, the applicable provisions of our Charter and our Bylaws, which are filed as
exhibits to our Annual Report on Form 10-K, of which this Exhibit 4.5 is a part, and are incorporated by reference herein. We encourage
you to read our Charter, our Bylaws, and the applicable provisions of the Delaware General Corporation Law (the “DGCL”)
for more information.

 

DESCRIPTION OF SECURITIES

 

Authorized
Capital Stock

 

Our authorized capital stock consists of
250,000,000 shares, of which 225,000,000 shares shall be common stock, par value $0.001 per share, and 25,000,000 shares shall
be preferred stock, par value of $0.001 per share. On September 11, 2020, we completed a 1-for-5 reverse split of our outstanding
shares of common stock. The reverse stock split had no effect on the number of authorized shares of common or preferred stock,
or on the stated par value per share of our common stock.

 

As of March 5, 2021 there were 53,482,364
shares of common stock outstanding, held by 40 stockholders of record, although we believe that there may be a significantly larger
number of beneficial owners of our common stock. We derived the number of stockholders by reviewing the listing of outstanding
common stock recorded by our transfer agent as of March 5, 2021.

 

Common Stock

 

Each holder of
our common stock is entitled to one vote for each share of common stock held on all matters submitted to a vote of the stockholders.
Holders of our common stock are entitled to receive ratably the dividends, if any, as may be declared from time to time by the
board of directors out of funds legally available therefor. If there is a liquidation, dissolution or winding up of our company,
holders of our common stock would be entitled to share in our assets remaining after the payment of liabilities. Holders of our
common stock have no preemptive or conversion rights or other subscription rights, and there are no redemption or sinking fund
provisions applicable to the common stock. The outstanding shares of common stock are fully paid and non-assessable. Holders of
shares of our common stock are not liable for further calls or to assessments by us. The rights, powers, preferences and privileges
of holders of common stock are subordinate to, and may be adversely affected by, the rights of the holders of shares of any series
of preferred stock which our board of directors may designate and issue in the future.

 

As of March 5, 2021,
no shares of preferred stock were outstanding. Shares of preferred stock may be issued from time to time in one or more series,
each of which will have such distinctive designation or title as shall be determined by our Board prior to the issuance of any
shares thereof. Preferred stock will have such voting powers, full or limited, or no voting powers, and such preferences, privileges
and relative, participating, optional or other special rights and such qualifications, limitations or restrictions thereof, including
dividend rights, conversion rights, voting rights, redemption rights, liquidation preference, sinking fund terms and the number
of shares constituting any series or the designation of any series, as shall be stated in such resolution or resolutions providing
for the issue of such class or series of preferred stock as may be adopted from time to time by the Board prior to the issuance
of any shares thereof.

 

    	 	 	 

    	 

    

 

The
issuance of preferred stock could adversely affect the rights of the holders of common stock and, therefore, reduce the market
price of the common stock. It is not possible to state the actual effect of the issuance of any shares of preferred stock on the
rights of holders of the common stock until the Board determines the specific rights of the holders of the preferred stock; however,
these effects may include:

 

	 	·	Restricting dividends on the common stock;

 

	 	·	Diluting the voting power of the common stock;

 

	 	·	Impairing the liquidation rights of the common stock; or

 

	 	·	Delaying, deterring or preventing a change in control of the Company.

 

 

Certain of our
existing holders of common stock have the right to require us to register their shares of common stock under the Securities
Act of 1933, as amended, in specified circumstances.

 

The transfer agent
and registrar for our common stock is Computershare Trust Company, N.A. The transfer agent’s address is 250 Royall Street,
Canton, Massachusetts 02021 and its telephone number is (800) 662-7232.

 

Dividend Policy

 

We have never
declared or paid any cash dividends on our capital stock, and we do not currently intend to pay any cash dividends on our common
stock for the foreseeable future. We expect to retain future earnings, if any, to fund the development and growth of our business.
Any future determination to pay dividends on our common stock will be at the discretion of our board of directors and will depend
upon, among other factors, our financial condition, operating results, current and anticipated cash needs, plans for expansion
and other factors that our board of directors may deem relevant.

 

Anti-Takeover
Provisions of Our Charter Documents and Delaware Law

 

Some provisions
of our Charter, our Bylaws and the DGCL could make it more difficult to acquire our company by means of a tender offer, a proxy
contest, or otherwise.

 

Our Bylaws establish
advance notice procedures with respect to stockholder proposals and the nomination of candidates for election as directors, other
than nominations made by or at the direction of our board of directors or a committee of our board of directors. These procedures
provide that notice of stockholder proposals must be timely given in writing to our corporate secretary prior to the meeting at
which the action is to be taken. Generally, for a proposal to be timely submitted for consideration at an annual meeting, notice
must be delivered to our secretary not less than 90 days nor more than 120 days prior to the first anniversary date of the annual
meeting for the preceding year. Our Bylaws specify the requirements as to form and content of all stockholders’ notices.
These provisions might preclude our stockholders from bringing matters before our annual meeting of stockholders or from making
nominations for directors at our annual meeting of stockholders if the proper procedures are not followed.

 

Our Charter and
Bylaws both provide that vacancies on our board of directors, including newly created directorships, may be filled only by a majority
vote of directors then in office, and directors so chosen shall hold office for a term expiring at the next annual meeting of stockholders
or until such director’s successor shall have been duly elected and qualified. Accordingly, the board of directors could
prevent any stockholder from filling the new directorships with such stockholder’s own nominee.

 

Our Charter provides
that, unless we consent in writing to the selection of an alternative forum, the Delaware
Court of Chancery shall be the sole and exclusive forum for (i) any derivative action or proceeding brought on our behalf,
(ii) any action asserting a claim of breach of a fiduciary duty owed by any of our current or former directors, officers or other
employees to us or our stockholders, (iii) any action asserting a claim arising pursuant to any provision of the DGCL, our Charter
or our Bylaws, or (iv) any action asserting a claim against us governed by the internal affairs doctrine; in all cases subject
to the court having personal jurisdiction over the indispensable parties named as defendants. This choice of forum provision may
limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors,
officers or other employees, which may discourage such lawsuits against us and our directors, officers and other employees.

 

    	 	 	 

    	 

    

 

Delaware Anti-Takeover
Law

 

We are subject
to Section 203 of the DGCL which contains anti-takeover provisions. In general, Section 203 prohibits a publicly held Delaware
corporation from engaging in a business combination with an interested stockholder for a period of three years following the date
that the person became an interested stockholder, unless the business combination or the transaction in which the person became
an interested stockholder is approved in a prescribed manner. Generally, a business combination includes a merger, asset or stock
sale or another transaction resulting in a financial benefit to the interested stockholder. An interested stockholder is a person
who, together with affiliates and associates, owns 15% or more of the corporation’s voting stock. The existence of this provision
may have an anti-takeover effect with respect to transactions that are not approved in advance by our board of directors, including
discouraging attempts that might result in a premium over the market price for the shares of common stock held by stockholders.

 

No Cumulative
Voting

 

Under the DGCL,
cumulative voting for the election of directors is not permitted unless a corporation’s certificate of incorporation authorizes
cumulative voting. Our Charter does not provide for cumulative voting in the election of directors. Cumulative voting allows a
minority stockholder to vote a portion or all of its shares for one or more candidates for seats on our board of directors. Without
cumulative voting, a minority stockholder will not be able to gain as many seats on our board of directors based on the number
of shares of our stock the stockholder holds as compared to the number of seats the stockholder would be able to gain if cumulative
voting were permitted. The absence of cumulative voting makes it more difficult for a minority stockholder to gain a seat on our
board of directors to influence our board’s decision regarding a takeover.

 

Stockholder
Action by Written Consent

 

The DGCL generally
provides that the affirmative vote of a majority of the shares entitled to vote on such matter is required to amend a corporation’s
certificate of incorporation or bylaws, unless a corporation’s certificate of incorporation or bylaws requires a greater
percentage. Our Charter permits our board of directors to amend or repeal most provisions of our Bylaws by majority vote. Generally,
our Charter may be amended by holders of a majority of the voting power of the then outstanding shares of our capital stock entitled
to vote. The stockholder vote or consent with respect to an amendment of our Charter or Bylaws would be in addition to any separate
class vote that might in the future be required under the terms of any series of preferred stock that might be outstanding at the
time such a proposed amendment were submitted to stockholders. The DGCL and the provisions of our Bylaws generally permit stockholders
owning the requisite percentage of shares of common stock necessary to approve an amendment to our Charter and Bylaws to act by
written consent in lieu of a meeting of our stockholders.

 

Limitation
of Liability and Indemnification of Officers and Directors

 

Our Bylaws provide
indemnification, including advancement of expenses, to the fullest extent permitted under applicable law to any person made or
threatened to be made a party to any threatened, pending, or completed action, suit, or proceeding, whether civil, criminal, administrative,
or investigative by reason of the fact that such person is or was a director or officer of the company, or is or was serving at
our request as a director or officer of another corporation, partnership, joint venture, trust, or other enterprise, including
service with respect to an employee benefit plan. In addition, our Charter provides that our directors will not be personally liable
to us or our stockholders for monetary damages for breaches of their fiduciary duty as directors, unless they violated their duty
of loyalty to us or our shareholders, acted in bad faith, knowingly or intentionally violated the law, authorized illegal dividends
or redemptions or derived an improper personal benefit from their action as directors. This provision does not limit or eliminate
our rights or the rights of any stockholder to seek nonmonetary relief such as an injunction or rescission in the event of a breach
of a director’s duty of care. In addition, this provision does not limit the directors’ responsibilities under the
DGCL or any other laws, such as the federal securities laws. We have obtained insurance that insures our directors and officers
against certain losses and which insures us against our obligations to indemnify the directors and officers. We also have entered
into indemnification agreements with our directors and executive officers.EXHIBIT 10.5

INDEMNITY AGREEMENT

 

THIS INDEMNITY
AGREEMENT (this “Agreement”) dated as of _____________, 2020, is made by and between Humanigen, Inc.,
a Delaware corporation (the “Company”), and [Name of Individual] (“Indemnitee”).

 

RECITALS:

 

A.      The
Company desires to attract and retain the services of highly qualified individuals as directors, officers, employees and agents.

 

B.      The
Company’s bylaws (the “Bylaws”) require that the Company indemnify its directors, and empowers the Company to
indemnify its officers, employees and agents, as authorized by the Delaware General Corporation Law, as amended (the “Code”),
under which the Company is organized and such Bylaws expressly provide that the indemnification provided therein is not exclusive
and contemplates that the Company may enter into separate agreements with its directors, officers and other persons to set forth
specific indemnification provisions.

 

C.      Indemnitee
does not regard the protection currently provided by applicable law, the Company’s governing documents and available insurance
as adequate under the present circumstances, and the Company has determined that Indemnitee and other directors, officers, employees
and agents of the Company may not be willing to serve or continue to serve in such capacities without additional protection.

 

D.      The
Company desires and has requested Indemnitee to serve or continue to serve as a director, officer, employee or agent of the Company,
as the case may be, and has proffered this Agreement to Indemnitee as an additional inducement to serve in such capacity.

 

E.      Indemnitee
is willing to serve, or to continue to serve, as a director, officer, employee or agent of the Company, as the case may be, if
Indemnitee is furnished the indemnity provided for herein by the Company.

 

AGREEMENT:

 

NOW THEREFORE,
in consideration of the mutual covenants and agreements set forth herein, the parties hereto, intending to be legally bound, hereby
agree as follows:

 

1.      Definitions.

 

(a)      Agent.
For purposes of this Agreement, the term “agent” of the Company means any person who: (i) is or was a director,
officer, employee or other fiduciary of the Company or a subsidiary of the Company; or (ii) is or was serving at the request
or for the convenience of, or representing the interests of, the Company or a subsidiary of the Company, as a director, officer,
employee or other fiduciary of a foreign or domestic corporation, partnership, joint venture, trust or other enterprise.

 

    	 	 	 

    	 

    

 

(b)      Expenses.
For purposes of this Agreement, the term “expenses” shall be broadly construed and shall include, without limitation,
all direct and indirect costs of any type or nature whatsoever (including, without limitation, all attorneys’, witness, or
other professional fees and related disbursements, and other out-of-pocket costs of whatever nature), actually and reasonably incurred
by Indemnitee in connection with the investigation, defense or appeal of a proceeding or establishing or enforcing a right to indemnification
under this Agreement, the Code or otherwise, and amounts paid in settlement by or on behalf of Indemnitee, but shall not include
any judgments, fines or penalties actually levied against Indemnitee for such individual’s violations of law. The term “expenses”
shall also include reasonable compensation for time spent by Indemnitee for which he is not compensated by the Company or any subsidiary
or third party (i) for any period during which Indemnitee is not an agent, in the employment of, or providing services for
compensation to, the Company or any subsidiary; and (ii) if the rate of compensation and estimated time involved is approved
by the directors of the Company who are not parties to any action with respect to which expenses are incurred, for Indemnitee while
an agent of, employed by, or providing services for compensation to, the Company or any subsidiary.

 

(c)      Proceedings.
For purposes of this Agreement, the term “proceeding” shall be broadly construed and shall include, without limitation,
any threatened, pending, or completed action, suit, arbitration, alternate dispute resolution mechanism, investigation, inquiry,
administrative hearing or any other actual, threatened or completed proceeding, whether brought in the right of the Company or
otherwise and whether of a civil, criminal, administrative or investigative nature, and whether formal or informal in any case,
in which Indemnitee was, is or will be involved as a party or otherwise by reason of: (i) the fact that Indemnitee is or was
a director or officer of the Company; (ii) the fact that any action taken by Indemnitee or of any action on Indemnitee’s
part while acting as director, officer, employee or agent of the Company; or (iii) the fact that Indemnitee is or was serving
at the request of the Company as a director, officer, employee or agent of another corporation, partnership, joint venture, trust,
employee benefit plan or other enterprise, and in any such case described above, whether or not serving in any such capacity at
the time any liability or expense is incurred for which indemnification, reimbursement, or advancement of expenses may be provided
under this Agreement.

 

(d)      Subsidiary.
For purposes of this Agreement, the term “subsidiary” means any corporation or limited liability company of which more
than 50% of the outstanding voting securities or equity interests are owned, directly or indirectly, by the Company and one or
more of its subsidiaries, and any other corporation, limited liability company, partnership, joint venture, trust, employee benefit
plan or other enterprise of which Indemnitee is or was serving at the request of the Company as a director, officer, employee,
agent or fiduciary.

 

(e)      Independent
Counsel. For purposes of this Agreement, the term “independent counsel” means a law firm, or a partner (or, if
applicable, member) of such a law firm, that is experienced in matters of corporation law and neither presently is, nor in the
past five (5) years has been, retained to represent: (i) the Company or Indemnitee in any matter material to either such
party, or (ii) any other party to the proceeding giving rise to a claim for indemnification hereunder. Notwithstanding the
foregoing, the term “independent counsel” shall not include any person who, under the applicable standards of professional
conduct then prevailing, would have a conflict of interest in representing either the Company or Indemnitee in an action to determine
Indemnitee’s rights under this Agreement.

 

    	 	 	 

    	 

    

 

2.      Agreement
to Serve. Indemnitee will serve, or continue to serve, as a director, officer, employee or agent of the Company or any subsidiary,
as the case may be, faithfully and to the best of his or her ability, at the will of such corporation (or under separate agreement,
if such agreement exists), in the capacity Indemnitee currently serves as an agent of such corporation, so long as Indemnitee is
duly appointed or elected and qualified in accordance with the applicable provisions of the Bylaws or other applicable charter
documents of such corporation, or until such time as Indemnitee tenders his or her resignation in writing; provided, however, that
nothing contained in this Agreement is intended as an employment agreement between Indemnitee and the Company or any of its subsidiaries
or to create any right to continued employment of Indemnitee with the Company or any of its subsidiaries in any capacity.

 

The Company acknowledges
that it has entered into this Agreement and assumes the obligations imposed on it hereby, in addition to and separate from its
obligations to Indemnitee under the Bylaws, to induce Indemnitee to serve, or continue to serve, as a director, officer, employee
or agent of the Company, and the Company acknowledges that Indemnitee is relying upon this Agreement in serving as a director,
officer, employee or agent of the Company.

 

3.      Indemnification.

 

(a)      Indemnification
in Third Party Proceedings. Subject to Section 10 below, the Company shall indemnify Indemnitee to the fullest extent
permitted by the Code, as the same may be amended from time to time (but, only to the extent that such amendment permits Indemnitee
to broader indemnification rights than the Code permitted prior to adoption of such amendment), if Indemnitee is a party to or
threatened to be made a party to or otherwise involved in any proceeding, for any and all expenses, actually and reasonably incurred
by Indemnitee in connection with the investigation, defense, settlement or appeal of such proceeding.

 

(b)      Indemnification
in Derivative Actions and Direct Actions by the Company. Subject to Section 10 below, the Company shall indemnify Indemnitee
to the fullest extent permitted by the Code, as the same may be amended from time to time (but, only to the extent that such amendment
permits Indemnitee to broader indemnification rights than the Code permitted prior to adoption of such amendment), if Indemnitee
is a party to or threatened to be made a party to or otherwise involved in any proceeding by or in the right of the Company to
procure a judgment in its favor, against any and all expenses actually and reasonably incurred by Indemnitee in connection with
the investigation, defense, settlement, or appeal of such proceedings.

 

4.      Indemnification
of Expenses of Successful Party. Notwithstanding any other provision of this Agreement, to the extent that Indemnitee has been
successful on the merits or otherwise in defense of any proceeding or in defense of any claim, issue or matter therein, including
the dismissal of any action without prejudice, the Company shall indemnify Indemnitee against all expenses actually and reasonably
incurred in connection with the investigation, defense or appeal of such proceeding.

 

5.      Partial
Indemnification. If Indemnitee is entitled under any provision of this Agreement to indemnification by the Company for some
or a portion of any expenses actually and reasonably incurred by Indemnitee in the investigation, defense, settlement or appeal
of a proceeding, but is precluded by applicable law or the specific terms of this Agreement to indemnification for the total amount
thereof, the Company shall nevertheless indemnify Indemnitee for the portion thereof to which Indemnitee is entitled.

 

    	 	 	 

    	 

    

 

6.      Advancement
of Expenses. To the extent not prohibited by law, the Company shall advance the expenses incurred by Indemnitee in connection
with any proceeding, and such advancement shall be made within twenty (20) days after the receipt by the Company of a statement
or statements requesting such advances (which shall include invoices received by Indemnitee in connection with such expenses but,
in the case of invoices in connection with legal services, any references to legal work performed or to expenditures made that
would cause Indemnitee to waive any privilege accorded by applicable law shall not be included with the invoice) and upon request
of the Company, an undertaking to repay the advancement of expenses if and to the extent that it is ultimately determined by a
court of competent jurisdiction in a final judgment, not subject to appeal, that Indemnitee is not entitled to be indemnified by
the Company. Advances shall be unsecured, interest free and without regard to Indemnitee’s ability to repay the expenses.
Advances shall include any and all expenses actually and reasonably incurred by Indemnitee pursuing an action to enforce Indemnitee’s
right to indemnification under this Agreement, or otherwise and this right of advancement, including expenses incurred preparing
and forwarding statements to the Company to support the advances claimed. Indemnitee acknowledges that the execution and delivery
of this Agreement shall constitute an undertaking providing that Indemnitee shall, to the fullest extent required by law, repay
the advance if and to the extent that it is ultimately determined by a court of competent jurisdiction in a final judgment, not
subject to appeal, that Indemnitee is not entitled to be indemnified by the Company. The right to advances under this Section shall
continue until final disposition of any proceeding, including any appeal therein. This Section 6 shall not apply to any claim
made by Indemnitee for which indemnity is excluded pursuant to Section 10(b).

 

7.      Notice
and Other Indemnification Procedures.

 

(a)      Notification
of Proceeding. Indemnitee will notify the Company in writing promptly upon being served with any summons, citation, subpoena,
complaint, indictment, information or other document relating to any proceeding or matter which may be subject to indemnification
or advancement of expenses covered hereunder. The failure of Indemnitee to so notify the Company shall not relieve the Company
of any obligation which it may have to Indemnitee under this Agreement or otherwise.

 

(b)      Request
for Indemnification and Indemnification Payments. Indemnitee shall notify the Company promptly in writing upon receiving notice
of nay demand, judgment or other requirement for payment that Indemnitee reasonably believes to the subject to indemnification
under the terms of this Agreement, and shall request payment thereof by the Company. Indemnification payments requested by Indemnitee
under Section 3 hereof shall be made by the Company no later than sixty (60) days after receipt of the written request
of Indemnitee. Claims for advancement of expenses shall be made under the provisions of Section 6 herein.

 

    	 	 	 

    	 

    

 

(c)      Application
for Enforcement. In the event the Company fails to make timely payments as set forth in Sections 6 or 7(b) above, Indemnitee
shall have the right to apply to any court of competent jurisdiction for the purpose of enforcing Indemnitee’s right to indemnification
or advancement of expenses pursuant to this Agreement. In such an enforcement hearing or proceeding, the burden of proof shall
be on the Company to prove by that indemnification or advancement of expenses to Indemnitee is not required under this Agreement
or permitted by applicable law. Any determination by the Company (including its Board of Directors, stockholders or independent
counsel) that Indemnitee is not entitled to indemnification hereunder, shall not be a defense by the Company to the action nor
create any presumption that Indemnitee is not entitled to indemnification or advancement of expenses hereunder.

 

(d)     Indemnification
of Certain Expenses. The Company shall indemnify Indemnitee against all expenses incurred in connection with any hearing or
proceeding under this Section 7 unless the Company prevails in such hearing or proceeding on the merits in all material respects.

 

8.      Assumption
of Defense. In the event the Company shall be requested by Indemnitee to pay the expenses of any proceeding, the Company, if
appropriate, shall be entitled to assume the defense of such proceeding, or to participate to the extent permissible in such proceeding,
with counsel reasonably acceptable to Indemnitee. Upon assumption of the defense by the Company and the retention of such counsel
by the Company, the Company shall not be liable to Indemnitee under this Agreement for any fees of counsel subsequently incurred
by Indemnitee with respect to the same proceeding, provided that Indemnitee shall have the right to employ separate counsel in
such proceeding at Indemnitee’s sole cost and expense. Notwithstanding the foregoing, if Indemnitee’s counsel delivers
a written notice to the Company stating that such counsel has reasonably concluded that there may be a conflict of interest between
the Company and Indemnitee in the conduct of any such defense or the Company shall not, in fact, have employed counsel or otherwise
actively pursued the defense of such proceeding within a reasonable time, then in any such event the fees and expenses of Indemnitee’s
counsel to defend such proceeding shall be subject to the indemnification and advancement of expenses provisions of this Agreement.

 

9.      Insurance.
To the extent that the Company maintains an insurance policy or policies providing liability insurance for directors, officers,
employees, or agents of the Company or of any subsidiary (“D&O Insurance”), Indemnitee shall be covered by such
policy or policies in accordance with its or their terms to the maximum extent of the coverage available for any such director,
officer, employee or agent under such policy or policies. If, at the time of the receipt of a notice of a claim pursuant to the
terms hereof, the Company has D&O Insurance in effect, the Company shall give prompt notice of the commencement of such proceeding
to the insurers in accordance with the procedures set forth in the respective policies. The Company shall thereafter take all necessary
or desirable action to cause such insurers to pay, on behalf of Indemnitee, all amounts payable as a result of such proceeding
in accordance with the terms of such policies.

 

    	 	 	 

    	 

    

 

10.    Exceptions.

 

(a)      Certain
Matters. Any provision herein to the contrary notwithstanding, the Company shall not be obligated pursuant to the terms of
this Agreement to indemnify Indemnitee on account of any proceeding with respect to (i) remuneration paid to Indemnitee if
it is determined by final judgment or other final adjudication that such remuneration was in violation of law (and, in this respect,
both the Company and Indemnitee have been advised that the Securities and Exchange Commission believes that indemnification for
liabilities arising under the federal securities laws is against public policy and is, therefore, unenforceable and that claims
for indemnification should be submitted to appropriate courts for adjudication, as indicated in Section 10(d) below); (ii) a
final judgment rendered against Indemnitee for an accounting, disgorgement or repayment of profits made from the purchase or sale
by Indemnitee of securities of the Company against Indemnitee or in connection with a settlement by or on behalf of Indemnitee
to the extent it is acknowledged by Indemnitee and the Company that such amount paid in settlement resulted from Indemnitee’s
conduct from which Indemnitee received monetary personal profit pursuant to the provisions of Section 16(b) of the Securities
Exchange Act of 1934, as amended, or other provisions of any federal, state or local statute or rules and regulations thereunder;
(iii) a final judgment or other final adjudication that Indemnitee’s conduct was in bad faith, knowingly fraudulent
or deliberately dishonest or constituted willful misconduct (but only to the extent of such specific determination); or (iv) on
account of conduct that is established by a final judgment as constituting a breach of Indemnitee’s duty of loyalty to the
Company or resulting in any personal profit or advantage to which Indemnitee is not legally entitled. For purposes of the foregoing
sentence, a final judgment or other adjudication may be reached in either the underlying proceeding or action in connection with
which indemnification is sought or a separate proceeding or action to establish rights and liabilities under this Agreement.

 

(b)      Claims
Initiated by Indemnitee. Any provision herein to the contrary notwithstanding, the Company shall not be obligated to indemnify
or advance expenses to Indemnitee with respect to proceedings or claims initiated or brought by Indemnitee against the Company
or its directors, officers, employees or other agents and not by way of defense, except (i) with respect to proceedings brought
to establish or enforce a right to indemnification under this Agreement or under any other agreement, provision in the Bylaws or
Certificate of Incorporation or applicable law, or (ii) with respect to any other proceeding initiated by Indemnitee that
is either approved by the Board of Directors or Indemnitee’s participation is required by applicable law. However, indemnification
or advancement of expenses may be provided by the Company in specific cases if the Board of Directors determines it to be appropriate.

 

(c)      Unauthorized
Settlements. Any provision herein to the contrary notwithstanding, the Company shall not be obligated pursuant to the terms
of this Agreement to indemnify Indemnitee under this Agreement for any amounts paid in settlement of a proceeding effected without
the Company’s written consent. Neither the Company nor Indemnitee shall unreasonably withhold consent to any proposed settlement;
provided, however, that the Company may in any event decline to consent to (or to otherwise admit or agree to any liability for
indemnification hereunder in respect of) any proposed settlement if the Company is also a party in such proceeding and determines
in good faith that such settlement is not in the best interests of the Company and its stockholders.

 

(d)      Securities
Act Liabilities. Any provision herein to the contrary notwithstanding, the Company shall not be obligated pursuant to the terms
of this Agreement to indemnify Indemnitee or otherwise act in violation of any undertaking appearing in and required by the rules
and regulations promulgated under the Securities Act of 1933, as amended (the “Act”), or in any registration statement
filed with the SEC under the Act. Indemnitee acknowledges that paragraph (h) of Item 512 of Regulation S-K currently
generally requires the Company to undertake in connection with any registration statement filed under the Act to submit the issue
of the enforceability of Indemnitee’s rights under this Agreement in connection with any liability under the Act on public
policy grounds to a court of appropriate jurisdiction and to be governed by any final adjudication of such issue. Indemnitee specifically
agrees that any such undertaking shall supersede the provisions of this Agreement and to be bound by any such undertaking.

 

    	 	 	 

    	 

    

 

11.    Contribution
Claims.

 

(a)      If
the indemnification provided in Section 3 is unavailable in whole or in part and may not be paid to Indemnitee for any reason
other than those set forth in Section 10, then in respect to any proceeding in which the Company is jointly liable with Indemnitee
(or would be if joined in such proceeding), to the fullest extent permitted by applicable law, the Company, in lieu of indemnifying
Indemnitee, shall pay, in the first instance, for any and all expenses, actually and reasonably incurred by Indemnitee in connection
with the investigation, defense, settlement or appeal of such proceeding without requiring Indemnitee to contribute to such payment,
and the Company hereby waives and relinquishes any right of contribution it may have at any time against Indemnitee.

 

(b)      With
respect to a proceeding brought against directors, officers, employees or agents of the Company (other than Indemnitee), to the
fullest extent permitted by applicable law, the Company shall indemnify Indemnitee from any claims for contribution that may be
brought by any such directors, officers, employees or agents of the Company (other than Indemnitee) who may be jointly liable with
Indemnitee, to the same extent Indemnitee would have been entitled to such indemnification under this Agreement if such proceeding
had been brought against Indemnitee.

 

12.    Nonexclusivity;
Priority of Payment and Survival of Rights.

 

(a)      The
provisions for indemnification and advancement of expenses set forth in this Agreement shall not be deemed exclusive of any other
rights which Indemnitee may at any time be entitled under any provision of applicable law, the Company’s Certificate of Incorporation,
Bylaws or other agreements, both as to action in Indemnitee’s official capacity and Indemnitee’s action as an agent
of the Company, in any court in which a proceeding is brought, and Indemnitee’s rights hereunder shall continue after Indemnitee
has ceased acting as an agent of the Company and shall inure to the benefit of the heirs, executors, administrators and assigns
of Indemnitee. The obligations and duties of the Company to Indemnitee under this Agreement shall be binding on the Company and
its successors and assigns until terminated in accordance with its terms. The Company shall require any successor (whether direct
or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business or assets of the Company,
expressly to assume and agree to perform this Agreement in the same manner and to the same extent that the Company would be required
to perform if no such succession had taken place.

 

(b)      
No amendment, alteration or repeal of this Agreement or of any provision hereof shall limit or restrict any right of Indemnitee
under this Agreement in respect of any action taken or omitted by such Indemnitee in his or her corporate status prior to such
amendment, alteration or repeal. To the extent that a change in the Code, whether by statute or judicial decision, permits greater
indemnification or advancement of expenses than would be afforded currently under the Company’s Certificate of Incorporation,
Bylaws and this Agreement, it is the intent of the parties hereto that Indemnitee shall enjoy by this Agreement the greater benefits
so afforded by such change. No right or remedy herein conferred is intended to be exclusive of any other right or remedy, and every
other right and remedy shall be cumulative and in addition to every other right and remedy given hereunder or now or hereafter
existing at law or in equity or otherwise. The assertion or employment of any right or remedy hereunder, or otherwise, by Indemnitee
shall not prevent the concurrent assertion or employment of any other right or remedy by Indemnitee.

 

    	 	 	 

    	 

    

 

13.    Term.
This Agreement shall continue until and terminate upon the later of: (a) five (5) years after the date that Indemnitee
shall have ceased to serve as a director or and/or officer, employee or agent of the Company; or (b) one (1) year after
the final termination of any proceeding, including any appeal then pending, in respect to which Indemnitee was granted rights of
indemnification or advancement of expenses hereunder.

 

No legal action
shall be brought and no cause of action shall be asserted by or in the right of the Company against an Indemnitee or an Indemnitee’s
estate, spouse, heirs, executors or personal or legal representatives after the expiration of five (5) years from the date
of accrual of such cause of action, and any claim or cause of action of the Company shall be extinguished and deemed released unless
asserted by the timely filing of a legal action within such five-year period; provided, however, that if any shorter period of
limitations is otherwise applicable to such cause of action, such shorter period shall govern.

 

14.      Subrogation.
In the event of any payment under this Agreement, the Company shall be subrogated to the extent of such payment to all of the rights
of recovery of Indemnitee, who, at the request and expense of the Company, shall execute all papers required and shall do everything
that may be reasonably necessary to secure such rights, including the execution of such documents necessary to enable the Company
effectively to bring suit to enforce such rights.

 

15.      Interpretation
of Agreement. It is understood that the parties hereto intend this Agreement to be interpreted and enforced so as to provide
indemnification to Indemnitee to the fullest extent now or hereafter permitted by law.

 

16.      Severability.
If any provision of this Agreement shall be held to be invalid, illegal or unenforceable for any reason whatsoever, (a) the
validity, legality and enforceability of the remaining provisions of the Agreement (including without limitation, all portions
of any paragraphs of this Agreement containing any such provision held to be invalid, illegal or unenforceable, that are not themselves
invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby; and (b) to the fullest extent possible,
the provisions of this Agreement (including, without limitation, all portions of any paragraph of this Agreement containing any
such provision held to be invalid, illegal or unenforceable, that are not themselves invalid, illegal or unenforceable) shall be
construed so as to give effect to the intent manifested by the provision held invalid, illegal or unenforceable and to give effect
to Section 15 hereof.

 

17.      Amendment
and Waiver. No supplement, modification, amendment, or cancellation of this Agreement shall be binding unless executed in writing
by the parties hereto. No waiver of any of the provisions of this Agreement shall be deemed or shall constitute a waiver of any
other provision hereof (whether or not similar) nor shall such waiver constitute a continuing waiver.

 

    	 	 	 

    	 

    

 

18.      Notice.
Except as otherwise provided herein, any notice or demand which, by the provisions hereof, is required or which may be given to
or served upon the parties hereto shall be in writing and, if by telegram, telecopy or telex, shall be deemed to have been validly
served, given or delivered when sent, if by overnight delivery, courier or personal delivery, shall be deemed to have been validly
served, given or delivered upon actual delivery and, if mailed, shall be deemed to have been validly served, given or delivered
three (3) business days after deposit in the United States mail, as registered or certified mail, with proper postage prepaid
and addressed to the party or parties to be notified at the addresses set forth on the signature page of this Agreement (or such
other address(es) as a party may designate for itself by like notice). If to the Company, notices and demands shall be delivered
to the attention of the Secretary of the Company.

 

19.      Governing
Law. This Agreement shall be governed exclusively by and construed according to the laws of the State of Delaware, as applied
to contracts entered into and to be performed entirely within Delaware.

 

20.      Counterparts.
This Agreement may be executed in one or more counterparts, each of which shall for all purposes be deemed to be an original but
all of which together shall constitute but one and the same Agreement. Only one such counterpart need be produced to evidence the
existence of this Agreement.

 

21.      Headings.
The headings of the sections of this Agreement are inserted for convenience only and shall not be deemed to constitute part of
this Agreement or to affect the construction hereof.

 

22.      Entire
Agreement. This Agreement constitutes the entire agreement between the parties with respect to the subject matter hereof and
supersedes all prior agreements, understandings and negotiations, written and oral, between the parties with respect to the subject
matter of this Agreement; provided, however, that this Agreement is a supplement to and in furtherance of the Company’s Certificate
of Incorporation, Bylaws, the Code and any other applicable law, and shall not be deemed a substitute therefor, and does not diminish
or abrogate any rights of Indemnitee thereunder.

 

    	 	 	 

    	 

    

 

IN WITNESS
WHEREOF, the parties hereto have entered into this Agreement effective as of the date first above written.

  

	 	COMPANY
	 	 
	 	HUMANIGEN, INC.

 

	 	By	 
	 	Name:	 
	 	Title:	 

 

	 	INDEMNITEE
	 	 
	 	 
	 	 

 

 

 

SIGNATURE PAGE TO

INDEMNITY AGREEMENT

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