BioLife Solutions (BLFS) CHRO sells stock under 10b5-1 tax plan

Rhea-AI Filing Summary

BioLife Solutions Inc. reported insider share sales by its Chief Human Resources Officer. The officer sold 233 shares of common stock on 12/09/2025 at $25.13 per share and 713 shares on 12/15/2025 at $24.46 per share. After these transactions, the officer beneficially owns 76,006 shares directly. The sales were made under a Rule 10b5-1(c) trading plan adopted effective 03-08-2024 to cover tax withholding obligations from the vesting of restricted stock.

Insider Trade Summary

Net Seller: 946 shares

Net Sell 2 txns

Insider Aebersold Sarah

Role Chief Human Resources Officer

Sold 946 shs ($23K)

Type	Security	Shares	Price	Value
Sale	Common Stock	713	$24.46	$17K
Sale	Common Stock	233	$25.13	$6K

Holdings After Transaction: Common Stock — 76,006 shares (Direct)

Footnotes (1)

1. F1. The sale reported herein was made pursuant to a Rule 10b5-1 (c) trading plan adopted by the reporting person effective as of 03-08-2024 to satisfy tax withholding obligations in connection with the vesting of shares of restricted stock.

FAQ

What insider transaction did BioLife Solutions (BLFS) disclose in this Form 4?

The filing reports that the Chief Human Resources Officer of BioLife Solutions Inc. sold shares of the company’s common stock in two transactions in December 2025.

How many BioLife Solutions (BLFS) shares were sold and on which dates?

The officer sold 233 shares of common stock on 12/09/2025 and 713 shares on 12/15/2025.

At what prices were the BioLife Solutions (BLFS) shares sold?

Shares were sold at $25.13 per share on 12/09/2025 and at $24.46 per share on 12/15/2025.

How many BioLife Solutions (BLFS) shares does the insider still own after these sales?

Following the reported transactions, the officer beneficially owns 76,006 shares of BioLife Solutions common stock directly.

Why were these BioLife Solutions (BLFS) shares sold by the insider?

According to the explanation, the sales were made to satisfy tax withholding obligations related to the vesting of restricted stock.

Were the BioLife Solutions (BLFS) insider sales made under a Rule 10b5-1 trading plan?

Yes. The filing states the sales were made under a Rule 10b5-1(c) trading plan adopted by the reporting person effective 03-08-2024.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 12/17/2025 - 05:26 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).

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^*

Aebersold Sarah

(Last) (First) (Middle)

3303 MONTE VILLA PARKWAY

SUITE 310

(Street)

BOTHELL WA 98021

(City) (State) (Zip)

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 Human Resources Officer

3. Date of Earliest Transaction (Month/Day/Year)
12/09/2025

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	12/09/2025		S(1)		233	D	$25.13	76,719	D
Common Stock	12/15/2025		S		713	D	$24.46	76,006	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. The sale reported herein was made pursuant to a Rule 10b5-1 (c) trading plan adopted by the reporting person effective as of 03-08-2024 to satisfy tax withholding obligations in connection with the vesting of shares of restricted stock.

Remarks:

	/s/ Sarah Aebersold	12/17/2025
	** 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.