Strata Critical Co-CEO has 31,671 shares withheld

Strata Critical Medical’s Co-CEO and CFO had shares withheld to cover taxes on vested RSUs, leaving over 1.67 million shares directly owned.

Rhea-AI Filing Summary

Strata Critical Medical, Inc. (SRTA) reported that Co-CEO and CFO William A. Heyburn had 31,671 shares of Class A common stock withheld on September 8, 2026 to satisfy tax withholding obligations arising from the vesting of restricted stock units. This was a share withholding, not an open-market sale, and Heyburn now directly holds 1,678,348 shares of Class A common stock.

Insider Trade Summary

Tax Withholding: 31,671 shares

Tax Withholding 1 txn

Insider Heyburn William A.

Role Co-CEO and CFO

Type	Security	Shares	Price	Value
Tax Withholding	Class A common stock, $0.0001 par value per share F1	31,671	$5.31	$168K

Holdings After Transaction: Class A common stock, $0.0001 par value per share — 1,678,348 shares (Direct)

Footnotes (1)

1. F1. Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Key Figures

Shares withheld for tax obligations: 31,671 shares Price per share used in tax-withholding entry: $5.31 per share Shares held after transaction: 1,678,348 shares

3 metrics

Shares withheld for tax obligations 31,671 shares Class A common stock withheld on September 8, 2026 for tax withholding on vested RSUs

Price per share used in tax-withholding entry $5.31 per share Applied to 31,671 withheld Class A common shares

Shares held after transaction 1,678,348 shares Class A common stock directly owned by William A. Heyburn after the September 8, 2026 transaction

Key Terms

restricted stock units, tax withholding obligations, Class A common stock

3 terms

restricted stock units financial

"in connection with the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"shares withheld by the Issuer to satisfy tax withholding obligations"

Class A common stock financial

"Class A common stock, $0.0001 par value per share"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

FAQ

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

What insider transaction did SRTA disclose for William A. Heyburn?

The company disclosed that 31,671 shares of Class A common stock were withheld from William A. Heyburn on September 8, 2026 to satisfy tax withholding obligations related to the vesting of restricted stock units.

Was the SRTA insider transaction an open-market sale?

No. The filing states the shares “represent shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units”, indicating a tax-withholding disposition rather than an open-market sale.

How many SRTA shares does William A. Heyburn hold after this transaction?

After the tax-withholding transaction, William A. Heyburn directly holds 1,678,348 shares of Strata Critical Medical, Inc. Class A common stock.

What was the reference price per SRTA share in this Form 4 transaction?

The Form 4 reports a price of $5.31 per share for the 31,671 Class A common shares withheld to cover tax obligations on vested restricted stock units.

Did the SRTA filing indicate use of a Rule 10b5-1 trading plan?

No. The filing does not report that this tax-withholding transaction was made under a Rule 10b5-1 trading plan.

What role does William A. Heyburn hold at SRTA?

William A. Heyburn is identified as Co-CEO and CFO of Strata Critical Medical, Inc. in the Form 4 filing.

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

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Available on EDGAR 09/10/2026 - 04:26 PM Accepted by SEC EDGAR 09/10/2026 - 04:25 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^*

Heyburn William A.

(Last) (First) (Middle)

C/O STRATA CRITICAL MEDICAL, INC.

666 THIRD AVENUE, 25TH FLOOR

(Street)

NEW YORK NEW YORK 10017

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Strata Critical Medical, Inc. [ SRTA ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Co-CEO and CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/08/2026

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
Class A common stock, $0.0001 par value per share	09/08/2026		F		31,671(1)	D	$5.31	1,678,348	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 withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Remarks:

	/s/ Melissa M. Tomkiel, as attorney-in-fact for William A. Heyburn	09/10/2026
	** 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)