Cerus (NASDAQ: CERS) CEO receives 1.2M-share RSU equity grant

Rhea-AI Filing Summary

Cerus Corp reported that President and CEO William Mariner Greenman received a grant of 1,200,000 restricted stock units (RSUs), each representing one share of common stock. The RSUs vest with 34% on March 12, 2027 and 66% on March 12, 2028, contingent on his continued service. Following this equity award and recent employee stock purchase plan acquisitions, his direct holdings total 5,331,167 shares of Cerus common stock.

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

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Greenman William Mariner

(Last) (First) (Middle)

C/O CERUS CORPORATION

1220 CONCORD AVE SUITE 600

(Street)

CONCORD CA 94520

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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
Common Stock	03/02/2026		A(1)		1,200,000	A	$0	5,331,167(2)	D

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

Explanation of Responses:

1. Each RSU represents a contingent right to receive one share of common stock of the Issuer. The RSUs vest in two annual installments with 34% of the grant vesting on March 12, 2027, and 66% of the grant vesting on March 12, 2028, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

2. Includes 5,318 and 10,004 shares purchased under Issuer's Employee Stock Purchase Plan on 08/29/25 and 02/27/26, respectively.

	William M. Greenman, by Chrystal N. Jensen, attorney-in-fact	03/04/2026
	** 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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What insider transaction did Cerus Corp (CERS) report for its CEO?

Cerus Corp reported an equity grant to its CEO. President and CEO William Mariner Greenman received 1,200,000 restricted stock units, each tied to one Cerus common share, as part of his compensation package.

How many Cerus (CERS) shares are covered by the CEO’s new RSU award?

The new award covers 1,200,000 Cerus shares via RSUs. Each restricted stock unit represents a contingent right to receive one share of common stock if specific vesting conditions are met over time.

When do the newly granted Cerus (CERS) RSUs to the CEO vest?

The RSUs vest in two future installments. Cerus states that 34% of the 1,200,000 RSUs vest on March 12, 2027, and the remaining 66% vest on March 12, 2028, assuming continuous service.

What conditions apply to the Cerus (CERS) CEO’s RSU vesting schedule?

Vesting depends on continued service. The 34% and 66% vesting tranches in 2027 and 2028 only occur if the CEO maintains continuous service with Cerus through each respective vesting date.

How many Cerus (CERS) shares does the CEO own after this RSU grant?

Post-grant, the CEO directly holds 5,331,167 shares. This total includes shares obtained under Cerus’s employee stock purchase plan alongside the newly granted restricted stock units reported in the filing.

Are recent employee stock purchase plan shares included in the Cerus (CERS) CEO’s total holdings?

Yes, recent plan purchases are included. The total 5,331,167 shares reflect 5,318 shares bought on August 29, 2025, and 10,004 shares bought on February 27, 2026, under Cerus’s employee stock purchase plan.