Quantum-Si Inc
A maker of benchtop instruments that read the sequence of proteins one molecule at a time, using semiconductor chips to detect individual amino acids. Its Platinum and Platinum Pro machines, sold to research labs, aim to make protein analysis cheaper and more automated than mass spectrometry. Founded in 2013 by Dr. Jonathan Rothberg, who earlier pioneered next-generation DNA sequencing, the name blends 'quantum' (its single-molecule detection) with 'Si,' the chemical symbol for silicon, the material of its chips.
Granted 37.15M · Bought 25.6K · Sold 3.53M
Granted 8.42M
Granted 3.93M · Bought 50.0K · Sold 306.2K
Granted 1.92M · Sold 89.0K
Granted 2.16M · Sold 179.9K
Granted 1.75M · Bought 100.0K · Sold 125.3K
Granted 1.19M · Bought 75.0K · Sold 79.7K
Granted 1.10M · Sold 128.7K
Granted 877.3K · Sold 8.2K
Bought 670.0K
Granted 718.5K · Sold 37.0K
Granted 670.5K
Granted 341.5K · Sold 8.1K
Granted 303.5K · Sold 7.5K
Granted 159.2K · Bought 109.9K
Granted 170.5K
Granted 141.8K
Granted 115.9K
Granted 114.3K
Granted 95.7K
Granted 66.7K
Granted 20.5K
Granted 20.5K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Rothberg Jonathan MDirector, 10% owner · 18 transactions | — | 40.19M | 37.15M | 25.6K | 3.53M |
| Tananbaum James B.Director · 7 transactions | — | 6.48Mas of Jun 2021 | 8.42M | — | — |
| Hawkins Jeffrey AlanPresident & CEO, Director · 16 transactions | — | 3.67M | 3.93M | 50.0K | 306.2K |
| Rakin KevinDirector · 5 transactions | — | 2.42M | 1.92M | — | 89.0K |
| Stark John VIIIChief Executive Officer, Director · 4 transactions | — | 1.98Mas of Jan 2022 | 2.16M | — | 179.9K |
| Keyes Jeffry R.Chief Financial Officer · 16 transactions | — | 1.72M | 1.75M | 100.0K | 125.3K |
| LaPointe ChristianGC & Corp. Secretary · 20 transactions | — | 1.18M | 1.19M | 75.0K | 79.7K |
| Vieceli John S.Chief Product Officer · 14 transactions | — | 1.14M | 1.10M | — | 128.7K |
| McKenna Michael PEVP, Product Development & Ops · 4 transactions | — | 869.0Kas of Jun 2022 | 877.3K | — | 8.2K |
| Kummeth Charles R.Director · 3 transactions | — | 855.0K | — | 670.0K | — |
| Bennett Todd C.Chief Commercial Officer · 4 transactions | — | 681.5K | 718.5K | — | 37.0K |
| Dekkers Marijn EDirector · 3 transactions | — | 670.5Kas of Jun 2021 | 670.5K | — | — |
| Dyer MatthewChief Business Officer · 4 transactions | — | 333.4Kas of Jun 2022 | 341.5K | — | 8.1K |
| Johnston GraceChief Commercial Officer · 3 transactions | — | 295.9Kas of Jun 2024 | 303.5K | — | 7.5K |
| Dowdy PaulaDirector · 2 transactions | — | 269.1K | 159.2K | 109.9K | — |
| Fattori Ruth ADirector · 2 transactions | — | 170.5K | 170.5K | — | — |
| Mendel ScottDirector · 1 transaction | — | 141.8K | 141.8K | — | — |
| Jafri AmirDirector · 1 transaction | — | 115.9K | 115.9K | — | — |
| Kenny John P.Director · 1 transaction | — | 114.3K | 114.3K | — | — |
| Drayton ClaudiaChief Financial Officer · 1 transaction | — | 95.7Kas of Jun 2021 | 95.7K | — | — |
| Bajaj VikramDirector · 1 transaction | — | 66.7Kas of Jun 2022 | 66.7K | — | — |
| Makes BrigidDirector · 1 transaction | — | 20.5K | 20.5K | — | — |
| Mina MichaelDirector · 1 transaction | — | 20.5Kas of Jun 2021 | 20.5K | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over all recorded history: -3.47M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.