STANDARD BIOTOOLS INC LAB
COM · Common Stock · CUSIP 34385P108
Company in South San Francisco, United States
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersBoston, MA
- Founded1999
- Websitestandardbio.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($18.7m this quarter). Holder counts are more reliable. Shares outstanding: 371.2m as of 2024-08-02, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $1.77. Options: 6 managers hold calls ($1.3m notional), 4 hold puts ($110.0k).
Trends to Q2 2024
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 66 |
| Q4 2022 | 68 |
| Q1 2023 | 69 |
| Q2 2023 | 67 |
| Q3 2023 | 73 |
| Q4 2023 | 87 |
| Q1 2024 | 146 |
| Q2 2024 | 146 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2022 | 29 | 32 |
| Q1 2023 | 29 | 28 |
| Q2 2023 | 24 | 39 |
| Q3 2023 | 31 | 28 |
| Q4 2023 | 48 | 26 |
| Q1 2024 | 120 | 24 |
| Q2 2024 | 73 | 70 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2023 | $82.9k | $98.9k | 1.19 |
| Q4 2023 | $29.8k | $663 | 0.02 |
| Q1 2024 | $3.1m | $1.1k | 0.00 |
| Q2 2024 | $1.3m | $110.0k | 0.09 |
Biggest buyers
| BlackRock Inc. | Added | +16.3m |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +4.1m |
| STATE STREET CORP | Added | +3.0m |
| VANGUARD GROUP INC | Added | +3.0m |
| Casdin Capital, LLC | Added | +2.1m |
| Amova Asset Management Americas, Inc. | Added | +1.8m |
| Sumitomo Mitsui Trust Group, Inc. | Added | +1.8m |
| Invenomic Capital Management LP | New | +950.1k |
| CITADEL ADVISORS LLC | New | +905.3k |
| Bank of New York Mellon Corp | Added | +893.4k |
Biggest sellers
| MORGAN STANLEY | Reduced | -9.9m |
| MILLENNIUM MANAGEMENT LLC | Reduced | -8.2m |
| Indaba Capital Management, L.P. | Sold out | -7.4m |
| Balyasny Asset Management L.P. | Reduced | -3.8m |
| GOLDMAN SACHS GROUP INC | Reduced | -2.6m |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | -1.9m |
| Parkman Healthcare Partners LLC | Sold out | -1.7m |
| Schonfeld Strategic Advisors LLC | Reduced | -1.2m |
| JANE STREET GROUP, LLC | Reduced | -1.1m |
| BARCLAYS PLC | Reduced | -1.1m |
Biggest calls
| Shaolin Capital Management LLC | New | $584.1k330.0k shares |
| GROUP ONE TRADING LLC | Reduced | $353.1k199.5k shares |
| SIMPLEX TRADING, LLC | Reduced | $159.0k89.9k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $139.8k79.0k shares |
| CITADEL ADVISORS LLC | Reduced | $22.7k12.8k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| SIMPLEX TRADING, LLC | Added | $38.0k21.6k shares |
| CITADEL ADVISORS LLC | Added | $36.6k20.7k shares |
| Caption Management, LLC | New | $35.4k20.0k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
Casdin Capital, LLC
13D · may seek influence
-0.3 pts · filed 2026-06-09
Stated purposeItem 4 of the Schedule 13D amendment filed on November 28, 2025 is hereby supplemented by the addition of the following: On June 6, 2026, the Issuer, Treeline Biosciences, Inc., a Delaware corporation (the "Company"), and Siri Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of the Issuer ("Merger Sub"), entered into an Agreement and Plan of Merger and Reorganization (the "Merger Agreement"), pursuant to which, among other matters, and subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Merger Sub will merge with and into the Company, with the Company continuing as a wholly owned subsidiary of the Issuer and the surviving corporation of the merger (the "Merger"). Upon the terms and subject to the conditions set forth in the Merg… Full filing |
23.9% |
VIKING GLOBAL INVESTORS LP
13D · may seek influence
no change · filed 2026-06-12
Stated purposeThe response to Item 3 of this Schedule 13D is incorporated by reference herein. On June 6, 2026, the Issuer, Treeline Biosciences, Inc., a Delaware corporation ("Treeline"), and Siri Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of the Issuer ("Merger Sub"), entered into an Agreement and Plan of Merger and Reorganization (the "Merger Agreement"), pursuant to which, among other matters, and subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Merger Sub will merge with and into Treeline, with Treeline continuing as a wholly owned subsidiary of the Issuer and the surviving corporation of the merger (the "Merger"). Upon the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the Merger… Full filing |
15.0% |
| MAK CAPITAL ONE LLC 13G · passive investor filed 2026-08-14 | 7.3% |
| MAK Capital Fund LP 13G · passive investor +1.5 pts · filed 2026-05-15 | 6.7% |
| Long Focus Capital Management, LLC 13G · institution new · filed 2026-08-14 | 6.0% |
Fell to 5% or below in the last year: BlackRock, Inc. (2.0%, 2026-07-30)
Insider purchases and sales in Q2 2024
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q3 2022 | 0 | — | 0 | — | — |
| Q4 2022 | 0 | — | 0 | — | — |
| Q1 2023 | 0 | — | 0 | — | — |
| Q2 2023 | 3 | $2.8m | 0 | — | — |
| Q3 2023 | 0 | — | 0 | — | — |
| Q4 2023 | 0 | — | 0 | — | — |
| Q1 2024 | 1 | $646.2k | 0 | — | — |
| Q2 2024 | 1 | $5.3m | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2024-05-23 | Casdin Partners GP, LLC +8 Director · See footnote | Bought | $260.0k100.0k shares |
| 2024-05-22 | Casdin Partners GP, LLC +8 Director · See footnote | Bought | $387.0k150.0k shares |
| 2024-05-21 | Casdin Partners GP, LLC +8 Director · See footnote | Bought | $896.0k350.0k shares |
| 2024-05-20 | Casdin Partners GP, LLC +8 Director · See footnote | Bought | $258.0k100.0k shares |
| 2024-05-17 | Casdin Partners GP, LLC +8 Director · See footnote. | Bought | $901.3k352.1k shares |
| 2024-05-16 | Casdin Partners GP, LLC +8 Director · See footnote. | Bought | $1.3m500.0k shares |
| 2024-05-15 | Casdin Partners GP, LLC +8 Director · See footnote. | Bought | $1.3m500.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2024
| Manager | Shares | Change |
|---|---|---|
| Casdin Capital, LLC 8.64% of their portfolio | 64.0m $113.2m | Added +2.1m |
| VIKING GLOBAL INVESTORS LP 0.40% of their portfolio | 58.7m $103.8m | Unchanged |
| BlackRock Inc. 0.00% of their portfolio | 21.8m $38.5m | Added +16.3m |
| VANGUARD GROUP INC 0.00% of their portfolio | 16.0m $28.3m | Added +3.0m |
| MORGAN STANLEY 0.00% of their portfolio | 12.9m $22.9m | Reduced -9.9m |
| ARK Investment Management LLC 0.20% of their portfolio | 12.7m $22.4m | Reduced -363.0k |
| Sumitomo Mitsui Trust Group, Inc. 0.01% of their portfolio | 10.6m $18.8m | Added +1.8m |
| Amova Asset Management Americas, Inc. 0.22% of their portfolio | 10.6m $18.7m | Added +1.8m |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 6.8m $12.0m | Added +4.1m |
| Tikvah Management LLC 3.78% of their portfolio | 6.6m $11.6m | Unchanged |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 6.2m $11.0m | Reduced -8.2m |
| STATE STREET CORP 0.00% of their portfolio | 4.3m $7.7m | Added +3.0m |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 4.1m $7.3m | Reduced -607.7k |
| PRIMECAP MANAGEMENT CO/CA/ 0.00% of their portfolio | 3.0m $5.3m | Reduced -13.2k |
| BARCLAYS PLC 0.00% of their portfolio | 2.9m $5.0m | Reduced -1.1m |
| Nan Fung Group Holdings Ltd 3.56% of their portfolio | 1.9m $3.3m | Unchanged |
| Slate Path Capital LP 0.06% of their portfolio | 1.6m $2.9m | Unchanged |
| Qube Research & Technologies Ltd 0.00% of their portfolio | 1.2m $2.2m | Reduced -487.8k |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 1.0m $1.8m | Reduced -249.3k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 1.0m $1.8m | Added +217.4k |
| Balyasny Asset Management L.P. 0.00% of their portfolio | 998.2k $1.8m | Reduced -3.8m |
| NEEDHAM INVESTMENT MANAGEMENT LLC 0.14% of their portfolio | 984.4k $1.7m | Reduced -140.0k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 981.0k $1.7m | Added +893.4k |
| Price Jennifer C. 2.02% of their portfolio | 980.1k $1.7m | Unchanged |
| Invenomic Capital Management LP 0.09% of their portfolio | 950.1k $1.7m | New |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 905.3k $1.6m | New |
| GAGNON SECURITIES LLC 0.36% of their portfolio | 898.5k $1.6m | Added +43.4k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 847.4k $1.5m | Added +735.8k |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 783.2k $1.4m | New |
| Pacific Capital Partners Ltd 0.88% of their portfolio | 750.0k $1.3m | New |
| Magnetar Financial LLC 0.03% of their portfolio | 693.0k $1.2m | Reduced -822.4k |
| Gagnon Advisors, LLC 0.91% of their portfolio | 672.3k $1.2m | Unchanged |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 641.0k $1.1m | Reduced -2.6m |
| Walleye Capital LLC 0.01% of their portfolio | 561.5k $993.9k | New |
| PARADIGM CAPITAL MANAGEMENT INC/NY 0.04% of their portfolio | 550.0k $973.5k | Unchanged |
| Swiss National Bank 0.00% of their portfolio | 488.9k $865.3k | Added +60.2k |
| Intellectus Partners, LLC 0.20% of their portfolio | 419.7k $742.9k | Reduced -3.8k |
| Assenagon Asset Management S.A. 0.00% of their portfolio | 417.9k $739.7k | Reduced -160.5k |
| Redmile Group, LLC 0.04% of their portfolio | 411.6k $728.6k | Unchanged |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 407.5k $721.2k | Added +396.7k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 403.5k $714.2k | Reduced -243.4k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 382.5k $677.0k | Added +278.4k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 362.4k $641.4k | Reduced -904.5k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 315.7k $558.8k | New |
| JOHNSON & JOHNSON 0.14% of their portfolio | 312.0k $552.2k | Unchanged |
| Squarepoint Ops LLC 0.00% of their portfolio | 305.5k $540.8k | Added +172.7k |
| ROYCE & ASSOCIATES LP 0.01% of their portfolio | 304.2k $538.5k | New |
| Alpine Global Management, LLC 0.09% of their portfolio | 293.7k $519.9k | New |
| COWEN AND COMPANY, LLC 0.01% of their portfolio | 274.4k $485.7k | Unchanged |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 259.5k $459.3k | Reduced -925.8k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 257.7k $456.1k | Reduced -378.7k |
| Legal & General Group Plc 0.00% of their portfolio | 247.2k $437.6k | Added +54.4k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 246.3k $436.0k | Added +51.2k |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 243.2k $430.5k | Added +179.8k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 242.2k $428.6k | Reduced -1.1m |
| Driehaus Capital Management LLC 0.00% of their portfolio | 236.5k $418.6k | Unchanged |
| Bradley & Co. Private Wealth Management, LLC 0.29% of their portfolio | 223.9k $396.4k | Reduced -223.9k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 223.0k $394.7k | Reduced -1.9m |
| UBS Group AG 0.00% of their portfolio | 175.5k $310.7k | Reduced -308.4k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 165.0k $293.0k | Added +96.2k |
| Corebridge Financial, Inc. 0.00% of their portfolio | 162.3k $288.9k | First filing |
| Invesco Ltd. 0.00% of their portfolio | 161.9k $286.6k | Added +138.6k |
| Rockefeller Capital Management L.P. 0.00% of their portfolio | 160.6k $284.2k | Added +890 |
| COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio | 156.2k $276.0k | Unchanged |
| Zweig-DiMenna Associates LLC 0.03% of their portfolio | 140.5k $248.7k | Reduced -365.0k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 136.2k $241.1k | Added +118.5k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 133.5k $236.3k | Added +122.3k |
| JANUS HENDERSON GROUP PLC 0.00% of their portfolio | 131.6k $232.3k | Added +59.5k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 125.8k $222.7k | Added +121.6k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 122.2k $216.3k | New |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 117.4k $207.8k | New |
| WEXFORD CAPITAL LP 0.05% of their portfolio | 107.6k $190.5k | New |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 103.0k $182.4k | New |
| RBF Capital, LLC 0.01% of their portfolio | 100.6k $178.0k | Reduced -341.0k |
| Maven Securities LTD 0.03% of their portfolio | 100.0k $177.0k | New |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 97.3k $172.2k | Added +70.9k |
| HighTower Advisors, LLC 0.00% of their portfolio | 88.1k $157.0k | Added +12.0k |
| MARSHALL WACE, LLP 0.00% of their portfolio | 81.6k $144.5k | Unchanged |
| MetLife Investment Management, LLC 0.00% of their portfolio | 76.9k $136.1k | New |
| CITIGROUP INC 0.00% of their portfolio | 75.9k $134.4k | Reduced -600.2k |
| SACHEM HILL LLC 0.03% of their portfolio | 74.2k $131.4k | Unchanged |
| BOOTHBAY FUND MANAGEMENT, LLC 0.00% of their portfolio | 73.2k $129.5k | Reduced -258.5k |
| ARIZONA STATE RETIREMENT SYSTEM 0.00% of their portfolio | 69.6k $123.2k | Added +9.9k |
| Polar Capital Holdings Plc 0.00% of their portfolio | 56.6k $100.2k | Unchanged |
| Zurcher Kantonalbank (Zurich Cantonalbank) 0.00% of their portfolio | 50.3k $89.1k | Added +32.6k |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 49.0k $88.9k | Unchanged |
| SG Americas Securities, LLC 0.00% of their portfolio | 48.3k $85.0k | Added +22.2k |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 47.0k $83.1k | Added +10.1k |
| Corvex Management LP 0.00% of their portfolio | 44.4k $78.6k | Unchanged |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO 0.00% of their portfolio | 42.6k $75.0k | Unchanged |
| BANK OF MONTREAL /CAN/ 0.00% of their portfolio | 41.9k $74.2k | New |
| TWO SIGMA ADVISERS, LP 0.00% of their portfolio | 38.4k $68.0k | Reduced -30.8k |
| XTX Topco Ltd 0.01% of their portfolio | 36.0k $63.7k | Added +9.9k |
| EntryPoint Capital, LLC 0.03% of their portfolio | 34.4k $60.8k | New |
| PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio | 32.1k $56.8k | New |
| SILVERBACK ASSET MANAGEMENT LLC 0.01% of their portfolio | 31.3k $55.3k | Reduced -93.7k |
| SEI INVESTMENTS CO 0.00% of their portfolio | 30.7k $54.2k | Added +372 |
| Ameritas Investment Partners, Inc. 0.00% of their portfolio | 29.6k $52.3k | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 28.6k $50.0k | Reduced -29.8k |
| TWO SIGMA SECURITIES, LLC 0.00% of their portfolio | 27.2k $48.2k | Added +11.0k |