Form 4 for BLFS BIOLIFE SOLUTIONS INC
Accepted 2026-05-21 19:10:04 ET · period of report 2026-05-19 · accession 0000919574-26-003646 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MI | 2026-05-21 19:10 | 2026-05-19+ | BLFS | Casdin Partners Master Fund, L.P. | 10% | S - Sale | $23.44 | -1.20M | 4.76M | -20% | -$28.12M |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock, par value $0.001 per share | 2026-05-19 | S | D | 300,000 | $22.65 | 5,657,165 | I See footnote | — | — | (F1) 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. |
| 2 | Common | Common Stock, par value $0.001 per share | 2026-05-20 | S | D | 250,000 | $23.70 | 5,407,165 | I See footnote | — | — | (F1) 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. |
| 3 | Common | Common Stock, par value $0.001 per share | 2026-05-21 | S | D | 650,000 | $23.70 | 4,757,165 | I See footnote | — | — | (F1) 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. |