Key facts
- This page summarizes Michael Singer's Form 4 filing for Cartesian Therapeutics, Inc. (RNAC).
- 2 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 06 Jan 2026, 16:18.
Michael Singer - 02 Jan 2026 Form 4 Insider Report for Cartesian Therapeutics, Inc. (RNAC)
- Reporting relationship
- Director
- Issuer ticker
- RNAC
- Reported as of
- 02 Jan 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 06 Jan 2026, 16:18:19 UTC
- Prior SEC filing
- 19 Nov 2025
- Next SEC filing
- 13 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Matthew Bartholomae, Attorney-in-Fact for Michael Singer
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Michael Singer filed Form 4 for Cartesian Therapeutics, Inc. (RNAC) on 06 Jan 2026.
Change
- Previous filing in this sequence was filed on 19 Nov 2025.
- 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 0002000122
Primary reporting owner
Singer Michael
- Relationship
- Director
- Address
- C/O CARTESIAN THERAPEUTICS, INC., 7495 NEW HORIZON WAY, FREDERICK
- Signature
- /s/ Matthew Bartholomae, Attorney-in-Fact for Michael Singer
- Signature date
- 06 Jan 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
RNAC
transaction
Common Stock
Award
- Transaction value
- $0
- Shares
- +2,600
- Change %
- +4.9%
- Price
- $0.000000
- Shares after
- 56,133
- Date
- 02 Jan 2026
- Ownership
- Direct
- Footnotes
- F1
RNAC
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 383,796
- Date
- 02 Jan 2026
- Ownership
- by trust
- Footnotes
- F2
RNAC
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 56,719
- Date
- 02 Jan 2026
- Ownership
- by trust
- Footnotes
- F3
RNAC
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 7,127
- Date
- 02 Jan 2026
- Ownership
- by trust
- Footnotes
- F4
RNAC
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 14,788
- Date
- 02 Jan 2026
- Ownership
- by spouse
- Footnotes
- F5
RNAC
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 96,219
- Date
- 02 Jan 2026
- Ownership
- as custodian
- Footnotes
- F6
RNAC
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 96,219
- Date
- 02 Jan 2026
- Ownership
- as custodian
- Footnotes
- F7
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
RNAC
transaction
Derivative
Stock Option (Right to Buy)
Award
- Transaction value
- $0
- Shares
- +7,800
- Change %
- Price
- $0.000000
- Shares after
- 7,800
- Date
- 02 Jan 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 7,800
- Exercise price
- $6.76
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 7 footnotes
Footnote F1
Each Restricted Stock Unit represents a contingent right to receive one share of common stock, which will vest in full on January 2, 2027.
Footnote F2
Shares are held in a trust for the benefit of the reporting person's spouse and children. The reporting person's spouse is a trustee of the trust.
Footnote F3
Shares are held in a trust for which the reporting person is a beneficiary. The reporting person is a trustee of the trust.
Footnote F4
Shares are held in a trust for which the reporting person is a beneficiary. The reporting person's spouse is a trustee of the trust.
Footnote F5
Shares are held by the reporting person's spouse.
Footnote F6
The shares are held for LS, the child of the reporting person, through a custodial account established pursuant to the Uniform Transfer to Minors Act ("UTMA") for which the reporting person serves as custodian.
Footnote F7
The shares are held for SS, the child of the reporting person, through a custodial account established pursuant to the UTMA for which the reporting person serves as custodian.