SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* SELICK HAROLD E (Last) (First) (Middle) 260 LITTLEFIELD AVENUE (Street) SOUTH SAN FRANCISCO CA 94080 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol CATALYST BIOSCIENCES, INC. [ CBIO ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 01/16/2018
	4. If Amendment, Date of Original Filed (Month/Day/Year)	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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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 Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)		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: 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)	$157.2(1)	01/16/2018		D			197(1)	(2)	05/13/2020	Common Stock	197(1)	$0.00	0	D
Stock Option (Right to Buy)	$157.2	01/16/2018		A		197		01/16/2018	07/11/2020(3)	Common Stock	197	$0.00	197	D
Stock Option (Right to Buy)	$66(1)	01/16/2018		D			550(1)	(2)	10/22/2025	Common Stock	550(1)	$0.00	0	D
Stock Option (Right to Buy)	$66	01/16/2018		A		550		01/16/2018	07/11/2020(3)	Common Stock	550	$0.00	550	D
Stock Option (Right to Buy)	$66(1)	01/16/2018		D			450(1)	(2)	10/22/2025	Common Stock	450(1)	$0.00	0	D
Stock Option (Right to Buy)	$66	01/16/2018		A		450		01/16/2018	07/11/2020(3)	Common Stock	450	$0.00	450	D
Stock Option (Right to Buy)	$28.2(1)	01/16/2018		D			500(1)	(2)	06/09/2026	Common Stock	500(1)	$0.00	0	D
Stock Option (Right to Buy)	$28.2	01/16/2018		A		500		01/16/2018	07/11/2020(3)	Common Stock	500	$0.00	500	D
Stock Option (Right to Buy)	$4.4	01/16/2018		D			10,000	06/15/2018(2)	07/13/2027	Common Stock	10,000	$0.00	0	D
Stock Option (Right to Buy)	$4.4	01/16/2018		A		10,000		01/16/2018	07/11/2020(3)	Common Stock	10,000	$0.00	10,000	D

Explanation of Responses:

1. Reflects a fifteen-for-one reverse stock split on February 10, 2017.

2. The option is fully vested and exercisable.

3. The reported transactions involved an amendment to the post-termination exercise period of outstanding options, resulting in the deemed cancellation of the vested options and the grant of replacement fully vested options.

Remarks:

	/s/ Faisal Shawwa, Attorney-in-Fact for Harold E. Selick	01/18/2018
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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