UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED

PURSUANT TO RULE 13d-2(b)

(Amendment No. 7)¹

Calithera Biosciences, Inc.

(Name of Issuer)

Common Stock, $0.0001 par value per share

(Title of Class of Securities)

13089P507

(CUSIP Number)

December 31, 2022

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐

Rule 13d-1(b)

☒

Rule 13d-1(c)

☐

Rule 13d-1(d)

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. 13089P507


	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	CITIZENSHIP OR PLACE OF ORGANIZATION

			Delaware
NUMBER OF			5	SOLE VOTING POWER
SHARES
BENEFICIALLY					0
OWNED BY			6	SHARED VOTING POWER
EACH
REPORTING					276,601 (1)
PERSON WITH			7	SOLE DISPOSITIVE POWER

					0
			8	SHARED DISPOSITIVE POWER

					276,601 (1)
	9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

			276,601 (1)
	10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES				☐


	11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

			5.7% (1)
	12	TYPE OF REPORTING PERSON

			PN

(1) Includes 23,625 Shares (as defined below) underlying certain Short Term Warrants (as defined below). The Short Term Warrants are subject to the Warrants Blocker (as defined below).

CUSIP No. 13089P507


	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	CITIZENSHIP OR PLACE OF ORGANIZATION

			Delaware
NUMBER OF			5	SOLE VOTING POWER
SHARES
BENEFICIALLY					0
OWNED BY			6	SHARED VOTING POWER
EACH
REPORTING					276,601 (1)
PERSON WITH			7	SOLE DISPOSITIVE POWER

					0
			8	SHARED DISPOSITIVE POWER

					276,601 (1)
	9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

			276,601 (1)
	10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES				☐


	11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

			5.7% (1)
	12	TYPE OF REPORTING PERSON

			OO

(1) Includes 23,625 Shares underlying certain Short Term Warrants. The Short Term Warrants are subject to the Warrants Blocker.

CUSIP No. 13089P507


	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	CITIZENSHIP OR PLACE OF ORGANIZATION

			Delaware
NUMBER OF			5	SOLE VOTING POWER
SHARES
BENEFICIALLY					0
OWNED BY			6	SHARED VOTING POWER
EACH
REPORTING					181,483
PERSON WITH			7	SOLE DISPOSITIVE POWER

					0
			8	SHARED DISPOSITIVE POWER

					181,483
	9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

			181,483
	10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES				☐


	11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

			3.7%
	12	TYPE OF REPORTING PERSON

			PN

CUSIP No. 13089P507


	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	CITIZENSHIP OR PLACE OF ORGANIZATION

			Delaware
NUMBER OF			5	SOLE VOTING POWER
SHARES
BENEFICIALLY					0
OWNED BY			6	SHARED VOTING POWER
EACH
REPORTING					181,483
PERSON WITH			7	SOLE DISPOSITIVE POWER

					0
			8	SHARED DISPOSITIVE POWER

					181,483
	9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

			181,483
	10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES				☐


	11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

			3.7%
	12	TYPE OF REPORTING PERSON

			OO

CUSIP No. 13089P507

NAME OF REPORTING PERSON

Biotechnology Value Trading Fund OS LP

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ☒

(b) ☐

SEC USE ONLY

CITIZENSHIP OR PLACE OF ORGANIZATION

Cayman Islands

NUMBER OF

SOLE VOTING POWER

BENEFICIALLY

OWNED BY

SHARED VOTING POWER

EACH

REPORTING

22,907

PERSON WITH

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

22,907

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

22,907

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

☐

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

Less than 1%

TYPE OF REPORTING PERSON

CUSIP No. 13089P507

NAME OF REPORTING PERSON

BVF Partners OS Ltd.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ☒

(b) ☐

SEC USE ONLY

CITIZENSHIP OR PLACE OF ORGANIZATION

Cayman Islands

NUMBER OF

SOLE VOTING POWER

BENEFICIALLY

OWNED BY

SHARED VOTING POWER

EACH

REPORTING

22,907

PERSON WITH

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

22,907

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

22,907

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

☐

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

Less than 1%

TYPE OF REPORTING PERSON

CUSIP No. 13089P507


	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	CITIZENSHIP OR PLACE OF ORGANIZATION

			Delaware
NUMBER OF			5	SOLE VOTING POWER
SHARES
BENEFICIALLY					0
OWNED BY			6	SHARED VOTING POWER
EACH
REPORTING					458,084 (1)
PERSON WITH			7	SOLE DISPOSITIVE POWER

					0
			8	SHARED DISPOSITIVE POWER

					458,084 (1)
	9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

			458,084 (1)
	10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES				☐


	11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

			9.4% (1)
	12	TYPE OF REPORTING PERSON

			OO

(1) Includes 23,625 Shares underlying certain Short Term Warrants. The Short Term Warrants are subject to the Warrants Blocker.

CUSIP No. 13089P507


	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	CITIZENSHIP OR PLACE OF ORGANIZATION

			Delaware
NUMBER OF			5	SOLE VOTING POWER
SHARES
BENEFICIALLY					0
OWNED BY			6	SHARED VOTING POWER
EACH
REPORTING					488,367 (1)
PERSON WITH			7	SOLE DISPOSITIVE POWER

					0
			8	SHARED DISPOSITIVE POWER

					488,367 (1)
	9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

			488,367 (1)
	10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES				☐


	11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

			9.99% (1)
	12	TYPE OF REPORTING PERSON

			PN, IA

(1) Includes 23,625 Shares underlying certain Short Term Warrants. The Short Term Warrants are subject to the Warrants Blocker.

CUSIP No. 13089P507


	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	CITIZENSHIP OR PLACE OF ORGANIZATION

			Delaware
NUMBER OF			5	SOLE VOTING POWER
SHARES
BENEFICIALLY					0
OWNED BY			6	SHARED VOTING POWER
EACH
REPORTING					488,367 (1)
PERSON WITH			7	SOLE DISPOSITIVE POWER

					0
			8	SHARED DISPOSITIVE POWER

					488,367 (1)
	9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

			488,367 (1)
	10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES				☐


	11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

			9.99% (1)
	12	TYPE OF REPORTING PERSON

			CO

(1) Includes 23,625 Shares underlying certain Short Term Warrants. The Short Term Warrants are subject to the Warrants Blocker.

CUSIP No. 13089P507


	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	CITIZENSHIP OR PLACE OF ORGANIZATION

			United States
NUMBER OF			5	SOLE VOTING POWER
SHARES
BENEFICIALLY					0
OWNED BY			6	SHARED VOTING POWER
EACH
REPORTING					488,367 (1)
PERSON WITH			7	SOLE DISPOSITIVE POWER

					0
			8	SHARED DISPOSITIVE POWER

					488,367 (1)
	9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

			488,367 (1)
	10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES				☐


	11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

			9.99% (1)
	12	TYPE OF REPORTING PERSON

			IN

(1) Includes 23,625 Shares underlying certain Short Term Warrants. The Short Term Warrants are subject to the Warrants Blocker.

CUSIP No. 13089P507

Item 1(a).

Name of Issuer:

Calithera Biosciences, Inc., a Delaware corporation (the “Issuer”).

Item 1(b).

Address of Issuer’s Principal Executive Offices:

343 Oyster Point Blvd., Suite 200

South San Francisco, California 94080

Item 2(a).

Name of Person Filing

Item 2(b).

Address of Principal Business Office or, if None, Residence

Item 2(c).

Citizenship

Biotechnology Value Fund, L.P. (“BVF”)

44 Montgomery St., 40th Floor

San Francisco, California 94104

Citizenship: Delaware

BVF I GP LLC (“BVF GP”)

44 Montgomery St., 40th Floor

San Francisco, California 94104

Citizenship: Delaware

Biotechnology Value Fund II, L.P. (“BVF2”)

44 Montgomery St., 40th Floor

San Francisco, California 94104

Citizenship: Delaware

BVF II GP LLC (“BVF2 GP”)

44 Montgomery St., 40th Floor

San Francisco, California 94104

Citizenship: Delaware

Biotechnology Value Trading Fund OS LP (“Trading Fund OS”)

PO Box 309 Ugland House

Grand Cayman, KY1-1104

Cayman Islands

Citizenship: Cayman Islands

BVF Partners OS Ltd. (“Partners OS”)

PO Box 309 Ugland House

Grand Cayman, KY1-1104

Cayman Islands

Citizenship: Cayman Islands

BVF GP Holdings LLC (“BVF GPH”)

44 Montgomery St., 40th Floor

San Francisco, California 94104

Citizenship: Delaware

BVF Partners L.P. (“Partners”)

44 Montgomery St., 40th Floor

San Francisco, California 94104

Citizenship: Delaware

CUSIP No. 13089P507

BVF Inc.

44 Montgomery St., 40th Floor

San Francisco, California 94104

Citizenship: Delaware

Mark N. Lampert (“Mr. Lampert”)

44 Montgomery St., 40th Floor

San Francisco, California 94104

Citizenship: United States

Each of the foregoing is referred to as a “Reporting Person” and collectively as the “Reporting Persons.”

Item 2(d).

Title of Class of Securities:

Common Stock, par value $0.0001 per share (the “Shares”).

Item 2(e).

CUSIP Number:

13089P507

Item 3.

If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:

	/x/	Not applicable.

(a)	/ /	Broker or dealer registered under Section 15 of the Exchange Act.

(b)	/ /	Bank as defined in Section 3(a)(6) of the Exchange Act.

(c)	/ /	Insurance company as defined in Section 3(a)(19) of the Exchange Act.

(d)	/ /	Investment company registered under Section 8 of the Investment Company Act.

(e)	/ /	An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E).

(f)	/ /	An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F).

(g)	/ /	A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G).

(h)	/ /	A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act.

(i)	/ /	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act.

(j)	/ /	A non-U.S. institution, in accordance with Rule 13d-1(b)(1)(ii)(J).

(k)	/ /	Group, in accordance with Rule 13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please specify the type of institution: ____

CUSIP No. 13089P507

Item 4.

Ownership

(a)

Amount beneficially owned:

As of the close of business on December 31, 2022, the Reporting Persons held an aggregate of 92,130 warrants that are immediately exercisable and expire 18 months from the date of issuance (the “Short Term Warrants”). The Short Term Warrants held by the Reporting Persons are exercisable for an aggregate of 92,130 Shares. Each Short Term Warrant is exercisable for one Share at an exercise price of $10.80 per Share (as adjusted from the original exercise price of $0.54 per Share following the Issuer’s 20:1 reverse stock split as disclosed in the Issuer’s Current Report on Form 8-K filed with the Securities and Exchange Commission on June 14, 2022). The exercise of the Short Term Warrants are subject to the limitations of the Warrants Blocker (as defined and described below). As of December 31, 2022, the Warrants Blocker limited the exercise of the Short Term Warrants by the Reporting Persons to 23,625 out of 92,130 Shares underlying the Short Term Warrants owned by the Reporting Persons in the aggregate. In providing beneficial ownership herein, the Reporting Persons have assumed that certain of the Short Term Warrants held by BVF will be exercised.

As of the close of business on December 31, 2022, the Reporting Persons held an aggregate of 92,130 warrants that are immediately exercisable and expire 5 years from the date of issuance (the “Long Term Warrants” and together with the Short Term Warrants, the “Warrants”). The Long Term Warrants held by the Reporting Persons are exercisable for an aggregate of 92,130 Shares. Each Long Term Warrant is exercisable for one Share at an exercise price of $10.80 per Share (as adjusted from the original exercise price of $0.54 per Share following the Issuer’s 20:1 reverse stock split as disclosed in the Issuer’s Current Report on Form 8-K filed with the Securities and Exchange Commission on June 14, 2022). The exercise of the Long Term Warrants are subject to the limitations of the Warrants Blocker. As of December 31, 2022, the Warrants Blocker limited the exercise of the Long Term Warrants by the Reporting Persons to 0 out of 92,130 Shares underlying the Long Term Warrants owned by the Reporting Persons in the aggregate. In providing beneficial ownership herein, the Reporting Persons have assumed that none of the Long Term Warrants held by the Reporting Persons will be exercised.

Under the terms of the Warrants, a holder of the Warrants will not have the right to exercise any portion of the Warrants it holds if such holder, together with its affiliates and any other person acting as a group together with the holder or any of its affiliates or as otherwise calculated in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended, would beneficially own in excess of 4.99% or 9.99% (at the election of the holder) of the number of Shares outstanding immediately after giving effect to such exercise (the “Warrants Blocker”); provided, however, that each holder may increase or decrease the Warrants Blocker by giving notice to the Issuer, with any such increase not taking effect until the sixty-first (61^st) day after such notice is delivered to the Issuer but not to any percentage in excess of 9.99%. The 9.99% Warrants Blocker currently applies to the Warrants held by the Reporting Persons.

CUSIP No. 13089P507

As of the close of business on December 31, 2022, (i) BVF beneficially owned 276,601 Shares, including 23,625 Shares underlying Short Term Warrants held by it, and excluding 30,853 Shares underlying the remaining Short Term Warrants held by it and 54,478 Shares underlying certain Long Term Warrants held by it; (ii) BVF2 beneficially owned 181,483 Shares, excluding 36,942 Shares underlying certain Short Term Warrants held by it and 36,942 Shares underlying certain Long Term Warrants held by it and (iii) Trading Fund OS beneficially owned 22,907 Shares.

BVF GP, as the general partner of BVF, may be deemed to beneficially own the 276,601 Shares beneficially owned by BVF.

BVF2 GP, as the general partner of BVF2, may be deemed to beneficially own the 181,483 Shares beneficially owned by BVF2.

Partners OS, as the general partner of Trading Fund OS, may be deemed to beneficially own the 22,907 Shares beneficially owned by Trading Fund OS.

BVF GPH, as the sole member of each of BVF GP and BVF2 GP, may be deemed to beneficially own the 458,084 Shares beneficially owned in the aggregate by BVF and BVF2.

Partners, as the investment manager of BVF, BVF2 and Trading Fund OS, and the sole member of Partners OS, may be deemed to beneficially own the 488,367 Shares beneficially owned in the aggregate by BVF, BVF2 and Trading Fund OS and held in a certain Partners managed account (the “Partners Managed Account”), including 7,376 Shares held in the Partners Managed Account, and excluding 710 Shares underlying certain Short Term Warrants held in the Partners Managed Account and 710 Shares underlying certain Long Term Warrants held in the Partners Managed Account.

BVF Inc., as the general partner of Partners, may be deemed to beneficially own the 488,367 Shares beneficially owned by Partners.

Mr. Lampert, as a director and officer of BVF Inc., may be deemed to beneficially own the 488,367 Shares beneficially owned by BVF Inc.

The foregoing should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of any Shares owned by another Reporting Person. BVF GP disclaims beneficial ownership of the Shares beneficially owned by BVF. BVF2 GP disclaims beneficial ownership of the Shares beneficially owned by BVF2. Partners OS disclaims beneficial ownership of the Shares beneficially owned by Trading Fund OS. BVF GPH disclaims beneficial ownership of the Shares beneficially owned by BVF and BVF2. Each of Partners, BVF Inc. and Mr. Lampert disclaims beneficial ownership of the Shares beneficially owned by BVF, BVF2 Trading Fund OS and held in the Partners Managed Account, and the filing of this statement shall not be construed as an admission that any such person or entity is the beneficial owner of any such securities.

(b)

Percent of class:

The following percentages are based upon a denominator that is the sum of: (i) 4,865,257 Shares outstanding as of November 9, 2022, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 14, 2022, and (ii) 23,625 Shares underlying certain of the Short Term Warrants held by the Reporting Persons, as applicable.

CUSIP No. 13089P507

As of the close of business on December 31, 2022, (i) BVF beneficially owned approximately 5.7% of the outstanding Shares, (ii) BVF2 beneficially owned approximately 3.7% of the outstanding Shares, (iii) Trading Fund OS beneficially owned less than 1% of the outstanding Shares, (iv) BVF GP may be deemed to beneficially own approximately 5.7% of the outstanding Shares, (v) BVF2 GP may be deemed to beneficially own approximately 3.7% of the outstanding Shares, (vi) Partners OS may be deemed to beneficially own less than 1% of the outstanding Shares, (vii) BVF GPH may be deemed to beneficially own approximately 9.4% of the outstanding Shares, and (viii) each of Partners, BVF Inc. and Mr. Lampert may be deemed to beneficially own approximately 9.99% of the outstanding Shares (less than 1% of the outstanding Shares are held in the Partners Managed Account).

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote

See Cover Pages Items 5-9.

(ii)

Shared power to vote or to direct the vote

See Cover Pages Items 5-9.

(iii)

Sole power to dispose or to direct the disposition of

See Cover Pages Items 5-9.

(iv)

Shared power to dispose or to direct the disposition of

See Cover Pages Items 5-9.

Item 5.

Ownership of Five Percent or Less of a Class.

Not Applicable.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

BVF GP, BVF GPH, Partners, BVF Inc. and Mr. Lampert share voting and dispositive power over the Shares beneficially owned by BVF. BVF GPH, Partners, BVF Inc. and Mr. Lampert share voting and dispositive power over the Shares beneficially owned by BVF2. Partners, BVF Inc. and Mr. Lampert share voting and dispositive power over the Shares beneficially owned by Trading Fund OS and held in the Partners Managed Account.

Item 7.

Identification and Classification of the Subsidiary That Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not Applicable.

CUSIP No. 13089P507

Item 8.

Identification and Classification of Members of the Group.

See Exhibit 99.1 to Amendment No. 3 to the Schedule 13G filed with the Securities and Exchange Commission on February 14, 2020.

Item 9.

Notice of Dissolution of Group.

Not Applicable.

Item 10.

Certifications.

By signing below each of the undersigned certifies that, to the best of its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

CUSIP No. 13089P507

SIGNATURE

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

Dated: February 14, 2023

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
	Mark N. Lampert
	President

Calithera Biosciences, Inc. SC 13G/A