Century Therapeutics (IPSC) CEO discloses tax withholding of 463 shares

Rhea-AI Filing Summary

Century Therapeutics, Inc.'s president and CEO, who is also a director, reported an automatic share withholding related to equity compensation. On 12/10/2025, 463 shares of common stock were withheld at $0.526 per share to cover tax obligations triggered by the vesting of restricted stock units. After this transaction, the executive directly owns 3,270,990 shares of Century Therapeutics common stock.

Insider Trade Summary

Net Seller: 463 shares

Net Sell 1 txn

Insider Pfeiffenberger Brent

Role President and CEO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	463	$0.526	$243.54

Holdings After Transaction: Common Stock — 3,270,990 shares (Direct)

Footnotes (1)

1. F1. Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 12/12/2025 - 04:16 PM Learn about SEC filing dates

FAQ

What insider transaction did Century Therapeutics (IPSC) report in this filing?

The president and CEO of Century Therapeutics, Inc. (IPSC) reported an automatic withholding of common shares to satisfy tax obligations arising from the vesting of restricted stock units.

How many Century Therapeutics (IPSC) shares were withheld for taxes?

The transaction shows that 463 shares of Century Therapeutics common stock were withheld by the issuer at a price of $0.526 per share to cover tax withholding obligations.

Does this Century Therapeutics (IPSC) filing reflect an open-market sale by the CEO?

No. The explanation states that the reported shares represent stock withheld by the issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units, not an open-market sale.

How many Century Therapeutics (IPSC) shares does the CEO own after this transaction?

Following the reported withholding, the president and CEO beneficially owns 3,270,990 shares of Century Therapeutics common stock in direct ownership.

When did the reported Century Therapeutics (IPSC) insider transaction occur?

The earliest transaction date reported in the filing is 12/10/2025, when the tax-related share withholding tied to vested restricted stock units took place.

What roles does the reporting person hold at Century Therapeutics (IPSC)?

The reporting person is identified as both a director and an officer, serving as the President and CEO of Century Therapeutics, Inc.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Pfeiffenberger Brent

(Last) (First) (Middle)

C/O CENTURY THERAPEUTICS, INC.

25 N 38TH STREET, 11TH FLOOR

(Street)

PHILADELPHIA PA 19104

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Century Therapeutics, Inc. [ IPSC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
12/10/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	12/10/2025		F(1)		463	D	$0.526	3,270,990	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

	/s/ Douglas Carr, Attorney-in-Fact	12/12/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.