CERUS CEO granted 193k shares, sells 78k for taxes

CERUS CORP President and CEO William Mariner Greenman reported offsetting stock transactions.

Accepted by SEC EDGAR 03/09/2026 - 09:28 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

CERUS CORP President and CEO William Mariner Greenman reported offsetting stock transactions. On March 5, 2026, he acquired 193,270 shares of common stock as a grant at $0.0000 per share. On March 6, 2026, he sold 78,187 shares at a weighted average price of $2.0055 per share pursuant to a Rule 10b5-1 instruction to cover statutory tax withholding and related brokerage fees. Following these transactions, he held 5,446,250 shares directly.

Insider Trade Summary

Net Seller: 78,187 shares

Net Sell 2 txns

Insider Greenman William Mariner

Role President and CEO

Sold 78,187 shs ($157K)

Share of Position Sold 1.4%

Type	Security	Shares	Price	Value
Sale	Common Stock	78,187	$2.0055	$157K
Grant/Award	Common Stock	193,270	$0.00	$0.00

Holdings After Transaction: Common Stock — 5,446,250 shares (Direct)

Holdings Before and After: Common Stock, 5,331,167 to 5,446,250 shares (Direct)

Other Insiders: 4 other insiders reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (2)

1. F1. Represents shares sold pursuant to an instruction intended to comply with the requirement of Rule 10b5-1 that was elected by the Reporting Person on the date of grant to cover statutory tax withholding obligations and corresponding brokerage fees in connection with the vesting of certain restricted stock units and does not represent a discretionary sale by the reporting person.
2. F2. Represents a weighted average sales price. These shares were sold in a block trade per share, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold pursuant to such block trade.

FAQ

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What insider transactions did CERUS CORP (CERS) report for CEO William Mariner Greenman?

CERUS CORP reported that CEO William Mariner Greenman received a grant of 193,270 shares of common stock on March 5, 2026 and sold 78,187 shares on March 6, 2026 in an open-market block trade.

Was the CERUS CORP CEO’s March 6, 2026 stock sale discretionary?

The 78,187-share sale on March 6, 2026 was made under a Rule 10b5-1 instruction elected at the grant date to cover statutory tax withholding and brokerage fees, and is described as not a discretionary sale by the CEO.

What price did the CERUS CORP CEO receive for the shares sold on March 6, 2026?

The 78,187 shares of CERUS CORP common stock sold on March 6, 2026 were transacted at a weighted average sales price of $2.0055 per share in a block trade, according to the Form 4 disclosure.

How many CERUS CORP shares did the CEO hold after these Form 4 transactions?

After the reported grant and sale transactions, CEO William Mariner Greenman directly held 5,446,250 shares of CERUS CORP common stock, as shown in the Form 4 totals following the March 6, 2026 open-market sale.

What was the nature of the 193,270 CERUS CORP shares acquired by the CEO?

The 193,270 shares reported on March 5, 2026 were acquired as a grant or award of CERUS CORP common stock at $0.0000 per share, categorized as a non-derivative acquisition under transaction code “A.”

How does the CERUS CORP Form 4 describe the CEO’s March 6, 2026 transaction type?

The March 6, 2026 transaction is classified as a sale in the open market or private transaction of common stock, with 78,187 shares sold and coded “S,” reflecting a non-derivative, open-market block trade at a weighted average price of $2.0055.

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Form 4 Insider Transactions: What Each Field Means →

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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).

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)
03/05/2026

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	03/05/2026		A		193,270	A	$0.00	5,524,437	D
Common Stock	03/06/2026		S(1)		78,187	D	$2.0055(2)	5,446,250	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 shares sold pursuant to an instruction intended to comply with the requirement of Rule 10b5-1 that was elected by the Reporting Person on the date of grant to cover statutory tax withholding obligations and corresponding brokerage fees in connection with the vesting of certain restricted stock units and does not represent a discretionary sale by the reporting person.

2. Represents a weighted average sales price. These shares were sold in a block trade per share, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold pursuant to such block trade.

	William M. Greenman, by Chrystal N. Jensen, attorney-in-fact	03/09/2026
	** 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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