BIOLIFE SOLUTIONS INC — Director's Dealing 2025

Oct 18, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOLIFE SOLUTIONS INC (BLFS)
CIK: 0000834365
Period of Report: 2025-10-15

Reporting Person: Casdin Partners Master Fund, L.P. (10% Owner)
Reporting Person: Casdin Capital, LLC (10% Owner)
Reporting Person: Casdin Partners GP, LLC (10% Owner)
Reporting Person: Casdin Eli (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-10-15	Common Stock, par value $0.001 per share	S	750000	$28.5471	Disposed	5957165	Indirect

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions within the range of $28.50 to $28.8354. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2: The securities are owned directly by Casdin Partners Master Fund, L.P. (the "Master Fund") and may be deemed to be indirectly beneficially owned by (i) Casdin Capital, LLC ("Casdin Capital"), the investment adviser to the Master Fund, (ii) Casdin Partners GP, LLC ("Casdin GP"), the general partner of the Master Fund, and (iii) Eli Casdin, the managing member of Casdin Capital and Casdin GP.