Cerus director granted 60,000 RSUs

Witney Frank reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Witney Frank reported acquisition or exercise transactions in this Form 4 filing.

CERUS CORP director Frank Witney reported an equity grant of 60,000 shares of Common Stock in the form of restricted stock units (RSUs). The RSUs were granted under Cerus’s 2024 Equity Incentive Plan, with each RSU representing a contingent right to receive one share of common stock.

The RSUs vest on the earlier of the first anniversary of the grant date or the day before the next annual meeting of stockholders, as long as Witney remains in continuous service with Cerus through that vesting date. Following this grant, he directly holds 340,059 shares of common stock.

Insider Trade Summary

Grant/Award: 60,000 shares

Grant/Award 1 txn

Insider Witney Frank

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	60,000	$0.00	$0.00

Holdings After Transaction: Common Stock — 340,059 shares (Direct)

Footnotes (1)

1. F1. Represents RSUs granted pursuant to the Issuer's 2024 Equity Incentive Plan. Each RSU represents a contingent right to receive one share of common stock of the Issuer. The RSUs vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

Key Figures

RSU grant size: 60,000 shares Shares held after transaction: 340,059 shares RSU grant price: $0.00 per share +1 more

4 metrics

RSU grant size 60,000 shares RSUs of Common Stock granted to director

Shares held after transaction 340,059 shares Direct holdings following RSU grant

RSU grant price $0.00 per share Reported transaction price per share for RSU grant

Vesting trigger Earlier of first anniversary or pre-annual meeting Vesting condition for RSUs, subject to continuous service

Key Terms

RSUs, 2024 Equity Incentive Plan, contingent right, continuous service, +1 more

5 terms

RSUs financial

"Represents RSUs granted pursuant to the Issuer's 2024 Equity Incentive Plan."

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

2024 Equity Incentive Plan financial

"Represents RSUs granted pursuant to the Issuer's 2024 Equity Incentive Plan."

contingent right financial

"Each RSU represents a contingent right to receive one share of common stock"

continuous service financial

"subject to the Reporting Person's continuous service to the Issuer through such vesting date."

annual meeting of stockholders financial

"the day prior to the next annual meeting of stockholders, subject to the Reporting Person's continuous service"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Cerus (CERS) director Frank Witney report?

Frank Witney reported receiving 60,000 restricted stock units (RSUs) of Cerus common stock as an equity grant. The grant was made under Cerus’s 2024 Equity Incentive Plan and increases his direct holdings to 340,059 shares after the reported transaction.

How many Cerus (CERS) shares does Frank Witney hold after this Form 4?

After the reported RSU grant, Frank Witney directly holds 340,059 shares of Cerus common stock. This total includes the newly granted 60,000 RSUs, each of which represents a contingent right to receive one Cerus common share upon vesting.

What are the terms of Frank Witney’s 60,000 Cerus RSUs?

The 60,000 RSUs each represent a contingent right to receive one Cerus common share. They vest on the earlier of the first anniversary of the grant date or the day before the next annual stockholders’ meeting, subject to Witney’s continuous service with the company.

Under which plan were Frank Witney’s Cerus RSUs granted?

Frank Witney’s 60,000 RSUs were granted under Cerus’s 2024 Equity Incentive Plan. This plan provides equity-based awards such as RSUs, tying director compensation to the company’s stock performance through share-based incentives instead of immediate cash payments.

Is Frank Witney’s Cerus RSU grant a market purchase or compensation award?

The 60,000 Cerus RSUs are a compensation-related award, not a market purchase. The Form 4 identifies the transaction as a grant or award acquisition, with a reported price per share of $0.00, indicating no cash was paid for the units by Witney.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/02/2026 - 07:37 PM Learn about SEC filing dates

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).

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^*

Witney Frank

(Last) (First) (Middle)

C/O CERUS CORPORATION

1220 CONCORD AVE

(Street)

CONCORD CALIFORNIA 94520

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/02/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	06/02/2026		A		60,000(1)	A	$0	340,059	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. Represents RSUs granted pursuant to the Issuer's 2024 Equity Incentive Plan. Each RSU represents a contingent right to receive one share of common stock of the Issuer. The RSUs vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

	Frank Witney by Chrystal N. Jensen, attorney-in-fact	06/02/2026
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)