SC 13D/A 1 sc13da707422xoma_10092020.htm AMENDMENT NO. 7 TO THE SCHEDULE 13D

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No. 7)1

XOMA Corporation

(Name of Issuer)

Common Stock, $0.0075 par value

(Title of Class of Securities)

98419J 206

(CUSIP Number)

JAMES KRATKY

BVF Partners L.P.

44 Montgomery St., 40th Floor

San Francisco, California 94104

(415) 525-8890

ADAM W. FINERMAN, ESQ.

OLSHAN FROME WOLOSKY LLP

1325 Avenue of the Americas

New York, New York 10019

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

October 7, 2020

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ☒.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See § 240.13d-7 for other parties to whom copies are to be sent.

1 The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BIOTECHNOLOGY VALUE FUND, L.P. |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | WC |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | DELAWARE |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 2,040,124 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 2,040,124 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 2,040,124 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 18.5% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | PN |

(1) Excludes 2,313,000 Shares underlying certain Series X Convertible Preferred Stock as described below in Item 5.

2

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BVF I GP LLC |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | AF |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | DELAWARE |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 2,040,124 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 2,040,124 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 2,040,124 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 18.5% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | OO |

(1) Excludes 2,313,000 Shares underlying certain Series X Convertible Preferred Stock as described below in Item 5.

3

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BIOTECHNOLOGY VALUE FUND II, L.P. |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | WC |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | DELAWARE |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 1,750,704 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 1,750,704 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 1,750,704 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 15.9% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | PN |

(1) Excludes 1,506,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

4

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BVF II GP LLC |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | AF |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | DELAWARE |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 1,750,704 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 1,750,704 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 1,750,704 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 15.9% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | OO |

(1) Excludes 1,506,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

5

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BIOTECHNOLOGY VALUE TRADING FUND OS, L.P. |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | WC |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | CAYMAN ISLANDS |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 159,537 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 159,537 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 159,537 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 1.5% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | PN |

(1) Excludes 412,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

6

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BVF PARTNERS OS LTD. |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | AF |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | CAYMAN ISLANDS |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 159,537 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 159,537 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 159,537 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 1.5% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | CO |

(1) Excludes 412,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

7

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BVF GP HOLDINGS LLC |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | AF |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | DELAWARE |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 3,790,828 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 3,790,828 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 3,790,828 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 34.4% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | OO |

(1) Excludes 3,819,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

8

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BVF PARTNERS L.P. |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | AF |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | DELAWARE |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 4,182,243 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 4,182,243 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 4,182,243 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 38.0% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | PN, IA |

(1) Excludes 5,003,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

9

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | BVF INC. |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | AF |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | DELAWARE |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 4,182,243 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 4,182,243 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 4,182,243 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 38.0% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | CO |

(1) Excludes 5,003,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

10

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | MARK N. LAMPERT |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
|  |  |  | AF |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | USA |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | - 0 - |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | 4,182,243 (1) |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | 4,182,243 (1) |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 4,182,243 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | 38.0% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | IN |

(1) Excludes 5,003,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

11

CUSIP No. 98419J 206

| 1 |  | NAME OF REPORTING PERSON |
|  |  |  | MATTHEW D. PERRY |
| 2 |  | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a) ☒
|  |  |  | (b) ☐
| 3 |  | SEC USE ONLY |  |
| 4 |  | SOURCE OF FUNDS |
| 5 |  | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) | ☐
| 6 |  | CITIZENSHIP OR PLACE OF ORGANIZATION |
|  |  |  | USA |
NUMBER OF |  | 7 |  | SOLE VOTING POWER |
SHARES |  |  |  |  |
BENEFICIALLY |  |  |  |  | 43,316 (1) |
OWNED BY |  | 8 |  | SHARED VOTING POWER |
EACH |  |  |  |  |
REPORTING |  |  |  |  | - 0 - |
PERSON WITH |  | 9 |  | SOLE DISPOSITIVE POWER |
|  |  |  |  | 43,316 (1) |
|  | 10 |  | SHARED DISPOSITIVE POWER |
|  |  |  |  | - 0 - |
| 11 |  | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
|  |  |  | 43,316 (1) |
| 12 |  | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES | ☐
| 13 |  | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) |
|  |  |  | Less than 1% (1) |
| 14 |  | TYPE OF REPORTING PERSON |
|  |  |  | IN |

(1) Includes 31,517 Shares issuable on the exercise of certain options that are exercisable within sixty days hereof.

12

CUSIP No. 98419J 206

The following constitutes Amendment No. 7 to the Schedule 13D filed by the undersigned (the “Amendment No. 7”). This Amendment No. 7 amends the Schedule 13D as specifically set forth herein.

| Item 6. | Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

Item 6 is hereby amended to add the following:

On October 7, 2020, Partners entered into a Securities Purchase Plan Agreement (the “Purchase Plan Agreement”) with Jefferies LLC (“Jefferies”) for the purpose of establishing a trading plan to effect purchases of Shares of the Issuer in compliance with all applicable laws, including, without limitation, Section 10(b) of the Exchange Act, and the rules and regulations promulgated thereunder, including, but not limited to, Rule 10b5-1.

The Purchase Plan Agreement allows for the purchase of Shares by Jefferies on behalf of Partners. Shares purchased pursuant to the Purchase Plan Agreement may only be purchased in accordance with trading parameters adopted by Partners, and there can be no assurance as to how many Shares, if any, will be purchased pursuant to the Purchase Plan Agreement or at what price any such Shares will be purchased. A copy of the Purchase Plan Agreement is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

| Item 7. | Materials to be Filed as Exhibits.

Item 7 is hereby amended to add the following exhibit:

| 99.1 | Purchase Plan Agreement by and among BVF Partners L.P. and Jefferies LLC, dated October 7, 2020.

13

CUSIP No. 98419J 206

SIGNATURES

After reasonable inquiry and to the best of his or its knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: October 9, 2020

BIOTECHNOLOGY VALUE FUND, L.P. |  | BIOTECHNOLOGY VALUE TRADING FUND OS LP
By: | BVF I GP LLC., its general partner |  | By: | BVF Partners L.P., its investment manager
|  |  | By: | BVF Inc., its general partner
By: | /s/ Mark N. Lampert |  |  |
| Mark N. Lampert |  | By: | /s/ Mark N. Lampert
| Chief Executive Officer |  |  | Mark N. Lampert
|  |  |  | President
BVF I GP LLC |  |  |
|  |  | BVF GP HOLDINGS LLC
By: | /s/ Mark N. Lampert |  |
| Mark N. Lampert |  | By: | /s/ Mark N. Lampert
| Chief Executive Officer |  |  | Mark N. Lampert
|  |  |  | Chief Executive Officer
BIOTECHNOLOGY VALUE FUND II, L.P. |  |
|  |  | BVF PARTNERS L.P.
By: | BVF II GP LLC, its general partner |  |
|  |  | By: | BVF Inc., its general partner
By: | /s/ Mark N. Lampert |  |  |
| Mark N. Lampert |  | By: | /s/ Mark N. Lampert
| Chief Executive Officer |  |  | Mark N. Lampert
|  |  |  | President
BVF II GP LLC |  |  |
|  |  | BVF INC.
By: | /s/ Mark N. Lampert |  |
| Mark N. Lampert |  | By: | /s/ Mark N. Lampert
| Chief Executive Officer |  |  | Mark N. Lampert
|  |  |  | President
BVF PARTNERS OS LTD. |  |  |
|  |  | /s/ Mark N. Lampert
By: | BVF Partners L.P., its sole member |  | MARK N. LAMPERT
By: | BVF Inc., its general partner |  |
By: | /s/ Mark N. Lampert |  | /s/ Matthew D. Perry
| Mark N. Lampert |  | MATTHEW D. PERRY
| President |  |  |

14