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SCHEDULE 13D/A Filed 2026-08-28 Event 2026-08-26 SEC 0001140361-26-034869 →

ROTHBERG JONATHAN M → Quantum-Si Inc QSI

Stake: 100.00% Shares: 14,376,415 CUSIP: 74765K105 Class: Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share

Item 4 — Purpose of Transaction

In connection with estate planning, entities owned by trusts created for the benefit of Dr. Jonathan Rothberg's children have entered into a trading plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the "Plan"), a copy of which is attached hereto as Exhibit 6. Pursuant to the Plan, sales of up to 8,947,746 shares of Class A common stock may be effected during the plan sales period beginning following the cooling-off period contained in Rule 10b5-1(c) on January 15, 2027 and ending on January 15, 2028 in accordance with the terms and conditions of the Plan. The sale of shares of Class A common stock under the Plan is subject to minimum price parameters included in the Plan, and there is no assurance that any shares of Class A common stock will be sold under the Plan.

Cross-References

Insider Activity (last 365d)
6 transactions
0 buys · 6 sales · 0 awards/exercises
Issuer Cluster
3 13D/G filings on this issuer
2 other filings besides this one
Filer Track Record
7 filings by this filer
6 other filings in the data moat
Short Interest · settle 2026-09-30
DTC 2.46
11,830,534 shares short · -9.3% vs prior

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-09-22 Hawkins Jeffrey Alan director, officer Sale 9,709 $0.76 $7K
2026-09-22 Keyes Jeffry R. officer Sale 2,493 $0.76 $2K
2026-09-22 LaPointe Christian officer Sale 4,721 $0.76 $4K
2026-09-21 Hawkins Jeffrey Alan director, officer Sale 20,143 $0.76 $15K
2026-09-21 Keyes Jeffry R. officer Sale 5,172 $0.76 $4K
2026-09-21 LaPointe Christian officer Sale 9,795 $0.76 $7K

Other 13D/G Filings on Quantum-Si Inc

FiledFormFilerStakeShares
2022-06-28 SC Foresite Capital Fund IV, L.P. — — view →
2021-06-14 SC Flynn James E — — view →

Other Filings by ROTHBERG JONATHAN M

FiledFormIssuerStakeShares
2026-08-17 SCHEDULE 13D/A Butterfly Network, Inc. — 828,775 view →
2026-07-21 SCHEDULE 13D/A Butterfly Network, Inc. — 828,775 view →
2026-07-17 SCHEDULE 13D/A Butterfly Network, Inc. 100.00% 828,775 view →
2025-03-07 SCHEDULE Butterfly Network, Inc. BFLY 100.00% 26,426,937 view →
2022-09-16 SC Butterfly Network, Inc. BFLY — — view →
2021-03-26 SC Butterfly Network, Inc. BFLY — — view →

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