BioLife exec has 1,907 BLFS shares withheld for taxes

BioLife Solutions executive Karen A. Foster had shares withheld to cover taxes on equity compensation.

Accepted by SEC EDGAR 03/23/2026 - 05:08 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

BioLife Solutions executive Karen A. Foster had shares withheld to cover taxes on equity compensation. On the release of restricted stock units, the company withheld 1,907 shares of Common Stock at a value of $19.12 per share to satisfy her tax obligations. After this tax-withholding disposition, she holds 111,335 shares of BioLife Solutions Common Stock directly.

Insider Trade Summary

Exercise Price or Tax Liability: 1,907 shares

Exercise Price or Tax Liability 1 txn

Insider Foster Karen A.

Role Chief Quality and Operations

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	1,907	$19.12	$36K

Holdings After Transaction: Common Stock — 111,335 shares (Direct)

Holdings Before and After: Common Stock, 113,242 to 111,335 shares (Direct)

Footnotes (1)

1. F1. Represents the number of shares withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

FAQ

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

What insider transaction did BioLife Solutions (BLFS) report for Karen A. Foster?

BioLife Solutions reported that executive Karen A. Foster had 1,907 Common Stock shares withheld by the company. These shares covered tax obligations arising from the release of restricted stock units, rather than representing an open-market sale or discretionary trade.

Was the BLFS Form 4 transaction a stock sale by Karen A. Foster?

The Form 4 does not show an open-market sale by Karen A. Foster. Instead, 1,907 shares were withheld by BioLife Solutions to pay tax withholding obligations tied to the vesting of restricted stock units granted as compensation.

How many BioLife Solutions (BLFS) shares does Karen A. Foster hold after this Form 4?

Following the tax-withholding transaction, Karen A. Foster directly holds 111,335 shares of BioLife Solutions Common Stock. This figure reflects her position after the company withheld 1,907 shares to satisfy tax obligations on released restricted stock units.

What does transaction code "F" mean in the BLFS Form 4 for Karen A. Foster?

Transaction code "F" on the Form 4 indicates a tax-withholding disposition. For Karen A. Foster, BioLife Solutions withheld 1,907 shares of Common Stock to satisfy tax liabilities triggered when her restricted stock units were released.

Did the BLFS Form 4 indicate any option exercises or derivative transactions?

The Form 4 data shows no option exercises or derivative security transactions for this event. It reflects only a tax-withholding disposition of 1,907 Common Stock shares associated with the release of restricted stock units for Karen A. Foster.

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

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).

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^*

Foster Karen A.

(Last) (First) (Middle)

3303 MONTE VILLA PARKWAY

SUITE 310

(Street)

BOTHELL WASHINGTON 98021

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
BIOLIFE SOLUTIONS INC [ BLFS ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Quality and Operations

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/19/2026

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
Common Stock	03/19/2026		F		1,907	D	$19.12(1)	111,335	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 the number of shares withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

Remarks:

	/s/ Karen A. Foster	03/23/2026
	** 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)