183 tracked 13F filers disclose a position in BLFS as of the latest SEC 13F filings, a combined $837.7M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | T. Rowe Price Investment Management, Inc. | Withheld | 6.5M | ▲+26% Added · +1.3M sh | Q1 2026 | |
| 2 | BlackRock, Inc. | $116.4M | 6.1M | ▲+3.2% Added · +190K sh | Q1 2026 | |
| 3 | Casdin Capital, LLC | $113.7M | 6.0M | —Held | Q1 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $36.6M | 1.9M | →First observed position No prior filed position | Q1 2026 | |
| 5 | STATE STREET CORP | $46.8M | 1.7M | ▲+5.0% Added · +79K sh | Q2 2026 | |
| 6 | FMR LLC | $28.1M | 1.5M | ▼−5.0% Reduced · −78K sh | Q1 2026 | |
| 7 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | $22.8M | 1.2M | ▲+19% Added · +193K sh | Q1 2026 | |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | $30.7M | 1.1M | ▲+12% Added · +115K sh | Q2 2026 | |
| 9 | FRED ALGER MANAGEMENT, LLC | $20.6M | 1.1M | ▼−0.4% Reduced · −4K sh | Q1 2026 | |
| 10 | DIMENSIONAL FUND ADVISORS LP | $19.8M | 1.0M | ▲+1.0% Added · +11K sh | Q1 2026 | |
| 11 | BANK OF AMERICA CORP /DE/ | $17.3M | 904K | ▲+73% Added · +383K sh | Q1 2026 | |
| 12 | AMERIPRISE FINANCIAL INC | $17.2M | 901K | ▼−0.3% Reduced · −3K sh | Q1 2026 | |
| 13 | ROYAL BANK OF CANADA | $16.9M | 885K | ▲+8.1% Added · +66K sh | Q1 2026 | |
| 14 | VANGUARD PORTFOLIO MANAGEMENT LLC | $16.5M | 865K | →First observed position No prior filed position | Q1 2026 | |
| 15 | Rockefeller Capital Management L.P. | $14.1M | 741K | ▲+5.0% Added · +35K sh | Q1 2026 | |
| 16 | Granahan Investment Management, LLC | $13.8M | 722K | ▲+50% Added · +240K sh | Q1 2026 | |
| 17 | Stephens Investment Management Group LLC | $20.0M | 709K | ▲+5.3% Added · +36K sh | Q2 2026 | |
| 18 | CRAMER ROSENTHAL MCGLYNN LLC | $12.1M | 633K | ▲New +633K sh | Q1 2026 | |
| 19 | GENEVA CAPITAL MANAGEMENT LLC | $16.4M | 582K | ▼−21% Reduced · −158K sh | Q2 2026 | |
| 20 | MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC | $10.9M | 573K | ▼−0.5% Reduced · −3K sh | Q1 2026 | |
| 21 | NEXT CENTURY GROWTH INVESTORS LLC | $15.8M | 559K | ▲+54% Added · +197K sh | Q2 2026 | |
| 22 | GAGNON SECURITIES LLC | $15.1M | 536K | ▼−0.1% Reduced · −606 sh | Q2 2026 | |
| 23 | MORGAN STANLEY | $8.5M | 444K | ▼−17% Reduced · −91K sh | Q1 2026 | |
| 24 | RAYMOND JAMES FINANCIAL INC | $8.4M | 444K | ▲+0.9% Added · +4K sh | Q1 2026 | |
| 25 | NORTHERN TRUST CORP | $8.4M | 443K | ▲+5.7% Added · +24K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 10 funds opened a new position in BLFS and 20 added to an existing one, while 18 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 90 funds | $153.7B |
| ALPHABET INC-CL AGOOGL | 90 funds | $79.7B |
| NVIDIA CORPNVDA | 89 funds | $224.0B |
| AMAZON.COM INCAMZN | 88 funds | $104.3B |
| META PLATFORMS INC-CLASS AMETA | 87 funds | $63.1B |
| BROADCOM INCAVGO | 83 funds | $88.4B |
| ELI LILLY & COLLY | 83 funds | $42.5B |
| MICRON TECHNOLOGY INCMU | 83 funds | $17.9B |
| APPLE INCAAPL | 82 funds | $167.1B |
| ALPHABET INC-CL CGOOG | 82 funds | $73.4B |
| VISA INC-CLASS A SHARESV | 82 funds | $37.0B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 81 funds | $20.1B |
Ranked by how many of BLFS's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| May 21, 2026 | Casdin Partners Master Fund, L.P. | 10% Owner | Sell (S) | 650K | $15.4M |
| May 20, 2026 | Casdin Partners Master Fund, L.P. | 10% Owner | Sell (S) | 250K | $5.9M |
| May 19, 2026 | Casdin Partners Master Fund, L.P. | 10% Owner | Sell (S) | 300K | $6.8M |
| Mar 23, 2026 | Foster Karen A. | Chief Quality and Operations | Sell (S) | 3K | $49K |
| Mar 9, 2026 | Foster Karen A. | Chief Quality and Operations | Sell (S) | 500 | $10K |
| Mar 5, 2026 | Foster Karen A. | Chief Quality and Operations | Sell (S) | 97K | $2.0M |
| Mar 3, 2026 | Berard Todd | Chief Marketing Officer | Sell (S) | 353 | $7K |
| Mar 3, 2026 | Aebersold Sarah | Chief Human Resources Officer | Sell (S) | 219 | $5K |
| Mar 3, 2026 | Wichterman Troy | Chief Financial Officer | Sell (S) | 588 | $12K |
| Mar 3, 2026 | Mathew Aby J. | EVP & Chief Scientific Officer | Sell (S) | 529 | $11K |
| Mar 3, 2026 | Foster Karen A. | Chief Quality and Operations | Sell (S) | 418 | $9K |
| Mar 3, 2026 | Werner Sean | Chief Technology Officer | Sell (S) | 111 | $2K |
Connected entities for BLFS
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/BLFS/capital-change-brief"
Use Arkolith's capital_change_brief for BLFS. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for BLFS. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.