CBIO Catalyst Biosciences Inc

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES                                                                                   
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940                       

1. Name and Address of Reporting Person * Musil Clinton	2. Issuer Name and Ticker or Trading Symbol CATALYST BIOSCIENCES, INC. [ CBIO ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    _____ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) Chief Financial Officer
(Last)          (First)          (Middle) C/O CATALYST BIOSCIENCES, INC., 611 GATEWAY BOULEVARD, SUITE 710	3. Date of Earliest Transaction (MM/DD/YYYY) 2/8/2021
(Street) SOUTH SAN FRANCISCO, CA 94080 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY) 2/10/2021	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$5.89	2/8/2021		A		54000		(1)	2/8/2031	Common Stock	54000	$0.00	54000	D

Explanation of Responses:
(1)	Award vests and will become exercisable monthly over 48 months, with 25% of the shares vesting on the 12-month anniversary of the date hereof, and the remainder vesting monthly thereafter at the rate of 1/48th of the total number of shares.

Remarks: The sole purpose of this amendment to the Form 4 filed on February 10, 2021, is to correct the vesting schedule.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Musil Clinton C/O CATALYST BIOSCIENCES, INC. 611 GATEWAY BOULEVARD, SUITE 710 SOUTH SAN FRANCISCO, CA 94080			Chief Financial Officer

Signatures
/s/ Faisal Shawwa Attorney-in-Fact for Clinton Musil		4/26/2021
**Signature of Reporting Person		Date