Key facts
- This page summarizes Ph.D. Jonathan M. Rothberg'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.
Ph.D. Jonathan M. Rothberg - 18 May 2026 Form 4 Insider Report for Quantum-Si Inc (QSI)
- Reporting relationship
- Director, 10%+ Owner
- Issuer ticker
- QSI
- Reported as of
- 18 May 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 20 May 2026, 16:05:24 UTC
- Prior SEC filing
- 08 Jan 2026
- Next SEC filing
- 22 May 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Christian LaPointe, Ph.D., Attorney-in-Fact.
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Ph.D. Jonathan M. Rothberg filed Form 4 for Quantum-Si Inc (QSI) on 20 May 2026.
Change
- Previous filing in this sequence was filed on 08 Jan 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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001076352
Primary reporting owner
ROTHBERG JONATHAN M
- Relationship
- Director, 10%+ Owner
- 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
- 1,904,866
- Date
- 18 May 2026
- Ownership
- By NVR TR, LLC
- Footnotes
- F1
QSI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,930,960
- Date
- 18 May 2026
- Ownership
- By JNR TR, LLC
- Footnotes
- F1
QSI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,930,960
- Date
- 18 May 2026
- Ownership
- By GBR TR, LLC
- Footnotes
- F1
QSI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,930,960
- Date
- 18 May 2026
- Ownership
- By EJR TR, LLC
- Footnotes
- F1
QSI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 2,568,443
- Date
- 18 May 2026
- Ownership
- Direct
QSI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,250,000
- Date
- 18 May 2026
- Ownership
- By JAR TR, LLC
- Footnotes
- F1
QSI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,917,067
- Date
- 18 May 2026
- Ownership
- By 23rd Century Capital LLC
- Footnotes
- F1
QSI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 273,422
- Date
- 18 May 2026
- Ownership
- By Bonnie E Gould Rothberg MD
- Footnotes
- F1
QSI
holding
Class B Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 17,943,750
- Date
- 18 May 2026
- Ownership
- By 4C Holdings I, LLC
- Footnotes
- F1
QSI
holding
Class B Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,993,750
- Date
- 18 May 2026
- Ownership
- By 4C Holdings V, LLC
- Footnotes
- F1
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
- F2
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 2 footnotes
Footnote F1
Dr. Rothberg is the sole manager of 4C Holdings I, LLC, 4C Holdings V, LLC, NVR TR, LLC, JNR TR, LLC, GBR TR, LLC, EJR TR, LLC and JAR TR, LLC and Dr. Rothberg is the spouse of Bonnie E. Gould Rothberg MD and Dr. Rothberg's son is the manager of 23rd Century Capital LLC. Dr. Rothberg disclaims beneficial ownership of the shares held by his spouse and 23rd Century Capital LLC.
Footnote F2
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.