SRTA Co-CEO’s shares withheld for RSU taxes

Strata Critical Medical, Inc. Co-CEO and CFO William A. Heyburn reported a Form 4 transaction involving company Class A common stock.

Rhea-AI Filing Summary

Strata Critical Medical, Inc. Co-CEO and CFO William A. Heyburn reported a Form 4 transaction involving company Class A common stock. On June 8, 2026, 31,671 shares were surrendered at a price of $5.87 per share. According to the footnote, these shares were withheld by the company to cover tax withholding obligations tied to the vesting of restricted stock units, rather than sold in the open market. After this tax-related share withholding, Heyburn held 1,548,997 shares directly, indicating he retained a substantially larger equity position in the company.

Insider Trade Summary

Net Seller: 31,671 shares

Net Sell 1 txn

Insider Heyburn William A.

Role Co-CEO and CFO

Sold 31,671 shs ($186K)

Type	Security	Shares	Price	Value
Sale	Class A common stock, $0.0001 par value per share	31,671	$5.87	$186K

Holdings After Transaction: Class A common stock, $0.0001 par value per share — 1,548,997 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: 31,671 shares Reported price per share: $5.87 per share Shares held after transaction: 1,548,997 shares +1 more

4 metrics

Shares withheld 31,671 shares Tax withholding on RSU vesting, June 8, 2026

Reported price per share $5.87 per share Associated with 31,671-share tax withholding event

Shares held after transaction 1,548,997 shares Direct holdings following the Form 4 event

Net shares disposed 31,671 shares Net-sell direction in transaction summary

Key Terms

restricted stock units, tax withholding obligations, Class A common stock, Form 4

4 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

"to satisfy tax withholding obligations in connection with the vesting"

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.

Form 4 regulatory

"reported a Form 4 transaction involving company Class A common stock"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What insider transaction did Strata Critical Medical (SRTA) report for William A. Heyburn?

Strata Critical Medical reported that Co-CEO and CFO William A. Heyburn had 31,671 shares withheld to cover tax obligations on vested restricted stock units. This was a tax-related disposition, not an open-market sale, and was disclosed on a Form 4 insider filing.

Was the SRTA Form 4 transaction an open-market sale of shares?

The Form 4 lists a sale code, but the footnote states the 31,671 shares were withheld by the issuer to satisfy tax withholding obligations on vested restricted stock units. This indicates a tax-related share disposition, not a discretionary open-market sale by the executive.

How many Strata Critical Medical shares did William A. Heyburn retain after the Form 4 event?

After the tax withholding event, William A. Heyburn directly held 1,548,997 shares of Strata Critical Medical Class A common stock. This remaining balance is much larger than the 31,671 shares withheld, suggesting the transaction affected only a small portion of his total holdings.

What price per share is associated with William A. Heyburn’s reported SRTA Form 4 transaction?

The Form 4 shows a transaction price of $5.87 per share for the 31,671 shares involved. While this price is reported in the filing, the footnote clarifies the shares were withheld for taxes on restricted stock unit vesting rather than sold in the open market.

Does the SRTA Form 4 tax withholding event signal a change in insider sentiment?

The Form 4 describes a tax withholding related to restricted stock unit vesting, not an elective open-market sale. Such tax-related dispositions are typically mechanical and driven by tax requirements, so they generally provide limited insight into the insider’s view of the company’s prospects.

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

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Accepted by SEC EDGAR 06/10/2026 - 04:06 PM EDT 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)
06/08/2026

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	06/08/2026		S		31,671(1)	D	$5.87	1,548,997	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	06/10/2026
	** 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)