Cerus (CERS) COO granted 420,000 RSUs vesting in 2027 and 2028

Rhea-AI Filing Summary

Jayaraman Vivek K reported acquisition or exercise transactions in this Form 4 filing.

Cerus Corp Chief Operating Officer Vivek K. Jayaraman reported an award of 420,000 restricted stock units representing common shares on March 2, 2026, at a stated price of $0.00 per share. These RSUs vest in two annual installments, with 34% vesting on March 12, 2027, and 66% vesting on March 12, 2028, contingent on his continuous service with the company through each vesting date.

After this grant, his directly held common stock, including shares from the company’s employee stock purchase plan, totals 1,866,648 shares. This total includes 5,318 shares purchased on August 29, 2025, and 10,004 shares purchased on February 27, 2026, under the employee stock purchase plan.

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^*

Jayaraman Vivek K

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Operating Officer

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)		420,000	A	$0	1,866,648(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.

	Vivek K. Jayaraman, 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 did Cerus (CERS) COO Vivek K. Jayaraman report in this Form 4?

Vivek K. Jayaraman reported receiving 420,000 restricted stock units representing Cerus common shares on March 2, 2026. The award carries a stated price of $0.00 per share and increases his reported directly held common stock position to 1,866,648 shares after the grant.

How do the 420,000 Cerus (CERS) RSUs granted to the COO vest?

The 420,000 RSUs vest in two installments tied to future dates. Cerus states that 34% vest on March 12, 2027, and the remaining 66% vest on March 12, 2028, provided Vivek K. Jayaraman maintains continuous service with the company through each vesting date.

What is Vivek K. Jayaraman’s Cerus (CERS) share ownership after this Form 4?

After the reported award, Vivek K. Jayaraman directly holds 1,866,648 Cerus common shares. This figure includes shares from the new 420,000-unit grant and shares purchased under the company’s employee stock purchase plan on August 29, 2025, and February 27, 2026.

What purchase plan activity is referenced in the Cerus (CERS) Form 4 footnotes?

The footnotes state that the total reported holdings include 5,318 shares and 10,004 shares bought under Cerus’s employee stock purchase plan. These purchases occurred on August 29, 2025, and February 27, 2026, and are included in the 1,866,648 directly held common shares figure.

Does the Cerus (CERS) COO have to stay employed to receive all the RSUs?

Yes. Cerus notes the RSUs vest only if Vivek K. Jayaraman maintains continuous service through each vesting date. The vesting schedule requires his ongoing service with the company through March 12, 2027, for the first tranche and March 12, 2028, for the second tranche.