Strata Critical Medical (SRTA) Co-CEO updates Form 4 for tax-withheld RSU shares

Rhea-AI Filing Summary

Strata Critical Medical, Inc. director and Co-CEO/CFO William A. Heyburn amended a prior insider filing to correctly classify a June 8, 2026 transaction as a tax-withholding event rather than a sale. On that date, 31,671 shares of Class A common stock at $5.87 per share were withheld by the company to cover tax obligations tied to the vesting of restricted stock units, in a transaction approved under Rule 16b-3. After this withholding, Heyburn directly held 1,548,997 shares of Class A common stock.

Insights

Equity compensation and insider-transactions analyst

Amended Form 4 reclassifies shares as tax withholding, not an open-market sale.

The transaction involves 31,671 shares of Class A common stock withheld at $5.87 per share to satisfy tax obligations on restricted stock unit vesting. Such F-code events are compensation-related mechanics rather than discretionary trading decisions.

The amendment corrects an earlier use of the S code, aligning the record with Rule 16b-3 approval language and the original footnote. Following the withholding, the reporting person directly holds 1,548,997 shares, so the event is minor relative to their overall position.

Insider Trade Summary

1 transaction reported

Mixed 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	31,671	$5.87	$186K

Holdings After Transaction: Class A common stock, $0.0001 par value per share — 1,548,997 shares (Direct, null)

Footnotes (1)

1. On June 10, 2026, the reporting person filed a Form 4 (the "Original Form") which inadvertently used the "S" code in Column 3 of Table I in connection with the disposal of certain shares of the Issuer's Class A common stock (the "Shares") on June 8, 2026. The Shares were in fact withheld by the Issuer to satisfy tax withholding obligations in connection a vesting event in a transaction approved in accordance with Rule 16b-3 of the Securities Exchange Act of 1934, as amended. Footnote 1 to the Original Form correctly described the transaction as "shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units." Accordingly, the reporting person is hereby amending the Original Form to correctly show the "F" code in Column 3 of Table I. The information set forth in the Original Form was correct in all other respects. 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 taxes: 31,671 shares Reference price per share: $5.87 per share Shares held after transaction: 1,548,997 shares

3 metrics

Shares withheld for taxes 31,671 shares Withheld on June 8, 2026 for RSU vesting tax obligations

Reference price per share $5.87 per share Value used for the 31,671-share tax-withholding event

Shares held after transaction 1,548,997 shares Direct Class A common stock holdings after June 8, 2026 event

Key Terms

restricted stock units, Rule 16b-3, tax withholding obligations, 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.

Rule 16b-3 regulatory

"in a transaction approved in accordance with Rule 16b-3 of the Securities Exchange Act"

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

tax withholding obligations financial

"shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting"

Form 4 regulatory

"the reporting person filed a Form 4 (the "Original Form") which inadvertently used the "S" code"

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.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/18/2026 - 04:11 PM Accepted by SEC EDGAR 06/18/2026 - 04:10 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)
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)
06/10/2026

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		F(1)		31,671(2)	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. On June 10, 2026, the reporting person filed a Form 4 (the "Original Form") which inadvertently used the "S" code in Column 3 of Table I in connection with the disposal of certain shares of the Issuer's Class A common stock (the "Shares") on June 8, 2026. The Shares were in fact withheld by the Issuer to satisfy tax withholding obligations in connection a vesting event in a transaction approved in accordance with Rule 16b-3 of the Securities Exchange Act of 1934, as amended. Footnote 1 to the Original Form correctly described the transaction as "shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units." Accordingly, the reporting person is hereby amending the Original Form to correctly show the "F" code in Column 3 of Table I. The information set forth in the Original Form was correct in all other respects.

2. 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	06/18/2026
	** 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)