Cartesian Therapeutics, Inc. — Director's Dealing 2023

Nov 15, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Cartesian Therapeutics, Inc. (RNAC)
CIK: 0001453687
Period of Report: 2023-11-13

Reporting Person: Singer Michael (Director, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-11-13	Common Stock	A	110123	—	Acquired	110123	Direct
2023-11-13	Common Stock	J	197663	—	Acquired	197663	Indirect
2023-11-13	Common Stock	J	29212	—	Acquired	29212	Indirect
2023-11-13	Common Stock	J	3670	—	Acquired	3670	Indirect
2023-11-13	Common Stock	J	49555	—	Acquired	49555	Indirect
2023-11-13	Common Stock	J	49555	—	Acquired	49555	Indirect
2023-11-13	Common Stock	J	7616	—	Acquired	7616	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-11-13	Series A Non-Voting Convertible Preferred Stock	$	A	6304.559	Acquired		Common Stock (6304559)	Direct
2023-11-13	Series A Non-Voting Convertible Preferred Stock	$	J	11316.263	Acquired		Common Stock (11316263)	Indirect
2023-11-13	Series A Non-Voting Convertible Preferred Stock	$	J	1672.389	Acquired		Common Stock (1672389)	Indirect
2023-11-13	Series A Non-Voting Convertible Preferred Stock	$	J	210.152	Acquired		Common Stock (210152)	Indirect
2023-11-13	Series A Non-Voting Convertible Preferred Stock	$	J	2837.052	Acquired		Common Stock (2837052)	Indirect
2023-11-13	Series A Non-Voting Convertible Preferred Stock	$	J	2837.052	Acquired		Common Stock (2837052)	Indirect
2023-11-13	Series A Non-Voting Convertible Preferred Stock	$	J	436.066	Acquired		Common Stock (436066)	Indirect

Footnotes

F1: On November 13, 2023, Selecta Biosciences, Inc. (the "Company") acquired Cartesian Therapeutics, Inc. ("Cartesian") in accordance with the terms of an Agreement and Plan of Merger, dated November 13, 2023. These securities represent merger consideration payable as a result of the closing of the merger.

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.

F3: Shares are held in a trust for which the reporting person is a beneficiary. The reporting person is a trustee of the trust.

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.

F5: 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.

F6: 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.

F7: Shares are held by the reporting person's spouse.

F8: Following the approval by the Stockholders of the conversion of the Series A Non-Voting Convertible Preferred Stock of the Company ("Series A Preferred Stock") into shares of common stock of the Company ("Common Stock"), each share of Series A Preferred Stock will be convertible into 1,000 shares of Common Stock, subject to certain limitations, including that a holder of Series A Preferred Stock is prohibited from converting shares of Series Preferred Stock into shares of Common Stock if, as a result of such conversion, such holder, together with its affiliates, would beneficially own more than 19.9% of the total number of shares of Common Stock issued and outstanding immediately after giving effect to such conversion.