Paula Dowdy - 18 May 2026 Form 4 Insider Report for Quantum-Si Inc (QSI)

Reporting relationship: Director
Issuer ticker: QSI
Reported as of: 18 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 20 May 2026, 16:05:29 UTC
Prior SEC filing: 09 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Christian LaPointe, Ph.D., Attorney-in-Fact.

Key filing fact

Paula Dowdy filed Form 4 for Quantum-Si Inc (QSI) on 20 May 2026.

Key facts

This page summarizes Paula Dowdy's Form 4 filing for Quantum-Si Inc (QSI).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 20 May 2026, 16:05.

Change

Previous filing in this sequence was filed on 09 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002016312 Primary reporting owner

Dowdy Paula

Relationship: Director
Address: C/O QUANTUM-SI INCORPORATED, 29 BUSINESS PARK DRIVE, BRANFORD
Signature: /s/ Christian LaPointe, Ph.D., Attorney-in-Fact.
Signature date: 20 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

QSI holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 269,107
Date: 18 May 2026
Ownership: Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

QSI transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +251,185
Change %
Price: $0.000000^*
Shares after: 251,185
Date: 18 May 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 251,185
Exercise price: $0.8539
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The shares underlying this option vest on the date of the Issuer's next regular annual stockholders meeting, subject to continued service through the applicable vesting date.