Century Therapeutics (NASDAQ: IPSC) CEO has 463 shares withheld for RSU taxes

Rhea-AI Filing Summary

Century Therapeutics, Inc. President and CEO Brent Pfeiffenberger reported a small share disposition related to taxes. On the vesting of restricted stock units, 463 shares of Common Stock were withheld by the company at a price of $2.13 per share to cover tax withholding obligations, leaving him with 3,679,323 shares held directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Pfeiffenberger Brent

Role President and CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	463	$2.13	$986.19

Holdings After Transaction: Common Stock — 3,679,323 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares withheld for taxes: 463 shares Withholding price per share: $2.13 per share Shares held after transaction: 3,679,323 shares

3 metrics

Shares withheld for taxes 463 shares Tax withholding on RSU vesting for CEO

Withholding price per share $2.13 per share Value used for tax-withholding shares

Shares held after transaction 3,679,323 shares CEO direct ownership following withholding

Key Terms

restricted stock units, tax withholding obligations, Common Stock

3 terms

restricted stock units financial

"in connection with the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"withheld by the Issuer to satisfy tax withholding obligations"

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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Form 4 Insider Transactions: What Each Field Means →

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, 12TH FLOOR

(Street)

PHILADELPHIA PENNSYLVANIA 19104

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/05/2026

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

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

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

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	06/05/2026		F(1)		463	D	$2.13	3,679,323	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	06/09/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What did Century Therapeutics (IPSC) CEO Brent Pfeiffenberger report on this Form 4?

Brent Pfeiffenberger reported a small tax-related disposition of shares. Specifically, 463 shares of Century Therapeutics Common Stock were withheld by the company to satisfy tax obligations upon vesting of restricted stock units, rather than being sold on the open market.

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

A total of 463 Common Stock shares were withheld for taxes. These shares were retained by Century Therapeutics to cover Brent Pfeiffenberger’s tax withholding obligations triggered by the vesting of his restricted stock units, which is a routine compensation-related event.

At what price per share were Century Therapeutics (IPSC) shares valued for the tax withholding?

The withheld shares were valued at $2.13 per share. This price was used to calculate the value of the 463 Century Therapeutics Common Stock shares retained by the company to meet Brent Pfeiffenberger’s tax withholding obligations related to his restricted stock unit vesting.

How many Century Therapeutics (IPSC) shares does Brent Pfeiffenberger hold after this transaction?

After the tax withholding, Brent Pfeiffenberger directly holds 3,679,323 Century Therapeutics Common Stock shares. The Form 4 shows this post-transaction balance, indicating that the withholding was very small compared with his overall direct ownership position in the company.

Was this Century Therapeutics (IPSC) Form 4 transaction an open-market sale by the CEO?

No, this was not an open-market sale. The 463 Century Therapeutics shares were withheld by the issuer to satisfy tax withholding obligations from restricted stock unit vesting, meaning the shares did not go through a public market transaction and reflect a routine compensation-related adjustment.