Quantum-Si incorporated (QSI) Institutional Ownership & Insider Trading

141 institutions reported holding Quantum-Si incorporated shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 33 insider trades on Form 4 since 2025-10-01.

Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason

QSIQuantum-Si incorporatedFollow QSI — free

Medical Devices · Healthcare

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Market cap: 306.4M
P/E TTM: —
Dividend yield: —
52-week: —
Next earnings: 5 Nov, in 12 days

Institutions · all 13F filers

quarter to 30 Jun 2026 · filers in both quarters

141 institutions held 24.2% of the shares. Across filers that reported both quarters, shares held changed -16.0%.

Largest moves, shares (millions)

Institutional flow by quarter

net shares added or trimmed, millions · filers in both quarters

Quarter	Holders	Shares held, M	Change	Increased	New	Decreased	Closed
Jun 26	141	53	-16.0%	36	27	53	37
Mar 26	156	63	-8.2%	33	37	36	19
Dec 25	132	67	+4.3%	34	26	35	17
Sep 25	120	65	-0.2%	39	11	35	21
Jun 25	132	64	+11.7%	51	13	32	14
Mar 25	133	58	+7.7%	38	35	32	19
Dec 24	117	54	+2.9%	41	28	21	18
Sep 24	106	52	-3.4%	23	15	30	10

Quantum-Si incorporated — questions

Who owns Quantum-Si incorporated stock?: 141 institutions reported Quantum-Si incorporated shares in 13F filings for the quarter ended 2026-06-30. The largest: VANGUARD CAPITAL MANAGEMENT LLC (3.5%), ARK Investment Management LLC (3.3%), BlackRock, Inc. (2.4%).
Are Quantum-Si incorporated insiders buying or selling?: 33 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.

Every figure on this page comes from Quantum-Si incorporated's own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.

How these figures are read: methodology · EquiReason.

Important information. Figures on this page are taken from filings submitted to the U.S. Securities and Exchange Commission (SEC) and processed automatically by EquiReason. They may contain errors, omissions or delays, and EquiReason makes no representation or warranty as to their accuracy, completeness or timeliness. Always verify figures against the original filing on SEC EDGAR before relying on them.

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