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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Greenman William Mariner   2. Issuer Name and Ticker or Trading Symbol CERUS CORP [CERS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) C/O CERUS CORPORATION, 2550 STANWELL DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 03/10/2019 (Street) CONCORD, CA 94520 4. If Amendment, Date 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 (City) (State) (Zip) 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 Common Stock 03/10/2019   M   22,500 A (1) 551,552 (2) D   Common Stock 03/12/2019   S   7,781 (3) D $ 6.48 543,771 D   Common Stock 03/12/2019   M   28,125 A (1) 571,896 D   Common Stock 03/13/2019   S   10,619 (3) D $ 5.8995 561,277 D   Common Stock 03/12/2019   M   71,667 A (1) 632,944 D   Common Stock 03/13/2019   S   27,059 (3) D $ 5.8997 605,885 D

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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 Underlying Securities (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

Restricted Stock Unit

(1)

03/10/2019

M

22,500

(4)

(4)

Common Stock

22,500

(5)

0

D

Restricted Stock Unit

(1)

03/12/2019

M

28,125

(6)

(6)

Common Stock

28,125

(5)

28,125

D

Restricted Stock Unit

(1)

03/12/2019

M

71,667

(7)

(7)

Common Stock

71,667

(5)

143,333

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Greenman William Mariner C/O CERUS CORPORATION 2550 STANWELL DRIVE CONCORD, CA 94520	X		President and CEO

Signatures

William M. Greenman, by Chrystal Menard, attorney-in-fact		03/13/2019
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Each restricted stock unit represents a contingent right to receive one (1) share of Cerus Common Stock.
(2)	Includes 1,951 shares purchased under Issuer's Employee Stock Purchase Plan on 02/28/19.
(3)	Represents the number of shares required to be sold to cover the statutory tax withholding obligations and corresponding brokerage fee in connection with the vesting of the restricted stock units listed in Table II. This sale is mandated by the election to satisfy the minimum statutory tax withholding obligations through a "sell to cover" transaction and does not represent a discretionary sale by the reporting person.
(4)	The restricted stock unit vests in three equal annual installments beginning on March 10, 2017.
(5)	Not applicable.
(6)	The restricted stock unit vests in three equal annual installments beginning on March 12, 2018.
(7)	The restricted stock unit vests in three equal annual installments beginning on March 12, 2019.

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