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 *

LAWLOR AUGUSTINE
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)
(Last)          (First)          (Middle)

C/O CATALYST BIOSCIENCES, INC., 611 GATEWAY BLVD., SUITE 710
3. Date of Earliest Transaction (MM/DD/YYYY)

2/25/2020
(Street)

SOUTH SAN FRANCISCO, CA 94080
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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
Common Stock 2/25/2020  S  69401 D$6.1023 (1)0 I By HealthCare Ventures VIII, L.P. (2)
Common Stock         15608 D  

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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) Represents the weighted average sales price per share. The shares sold at prices ranging from $6.10 to $6.22 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer.
(2) HealthCare Ventures VIII, L.P. ("HCVVIII") is the registered owner of the securities. The Reporting Person is a managing director of HealthCare Partners VIII, LLC ("HCPVIII LLC"), the General Partner of HealthCare Partners VIII, L.P. ("HCPVIII"). HCPVIII is the General Partner of HCVVIII. The Reporting Person shares voting and investment power over the shares held by HCVVIII with each of Christopher Mirabelli, James Cavanaugh, John Littlechild and Harold Werner as managing directors of HCPVIII LLC. The Reporting Person disclaims beneficial ownership of those securities in which he does not have a pecuniary interest and this report shall not be deemed an admission that he is the beneficial owner of these securities for purposes of Section 16, except to the extent of his pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
LAWLOR AUGUSTINE
C/O CATALYST BIOSCIENCES, INC.
611 GATEWAY BLVD., SUITE 710
SOUTH SAN FRANCISCO, CA 94080
X



Signatures
/s/ Faisal Shawwa, Attorney-in-Fact for Augustine Lawlor2/25/2020
**Signature of Reporting PersonDate

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