Form 4: CERS Director Increases Stake to 86,725 Shares

Rhea-AI Filing Summary

CERUS CORP reporting person Dean A. Gregory (Director) effected a purchase of 25,000 shares of Cerus common stock on 08/25/2025 at a price of $1.25 per share. After the transaction the reporting person beneficially owned 86,725 shares. The Form 4 was filed by one reporting person and executed by an attorney-in-fact, Chrystal N. Jensen.

Positive

• Director purchase of 25,000 shares at $1.25 demonstrates insider acquisition activity
• Post-transaction beneficial ownership reported as 86,725 shares, providing transparency

Negative

• None.

Insights

Securities Analyst

TL;DR: A director purchased 25,000 shares at $1.25, modestly increasing ownership to 86,725 shares.

The disclosure shows a routine insider purchase rather than a sale or option exercise. The size and price are explicit: 25,000 shares at $1.25 each. For a public investor this confirms an insider acquired additional stock, but the filing does not provide context on total outstanding shares or the director's prior holdings beyond the post-transaction total, so material impact on valuation cannot be determined from this form alone.

Corporate Governance Expert

TL;DR: Director-level insider purchase executed through an attorney-in-fact; filing follows Section 16 reporting format.

The Form 4 is properly completed for a single reporting person and includes the reporting persons relationship as a director and the attorney-in-fact signature. This is a standard Section 16 disclosure showing acquisition code "P" (purchase). No derivative transactions or other changes in beneficial ownership are reported. The filing contains the required details but offers no further governance implications beyond documenting the acquisition.

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
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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).

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^*

Gregory Dean A.

(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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/25/2025

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	08/25/2025		P		25,000	A	$1.25	86,725	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:

	Dean A. Gregory by Chrystal N. Jensen, attorney-in-fact	08/25/2025
	** 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.

FAQ

What did Cerus Corp (CERS) insider Dean A. Gregory do on 08/25/2025?

The director purchased 25,000 shares of Cerus common stock at $1.25 per share on 08/25/2025.

How many Cerus shares does the reporting person own after the transaction?

After the reported purchase the reporting person beneficially owned 86,725 shares.

Who signed the Form 4 for the reporting person?

The Form 4 was executed by attorney-in-fact Chrystal N. Jensen on behalf of Dean A. Gregory.

Was the Form 4 filed by one reporting person or multiple persons?

The form indicates it was filed by one reporting person.

Does the filing report any derivative transactions for CERS?

No. Table II for derivative securities contains no entries in this filing.