Century Therapeutics CEO shares withheld for RSU taxes

Century Therapeutics, Inc. President and CEO Brent Pfeiffenberger had 31,172 shares of Common Stock withheld by the company to cover taxes tied to restricted stock units vesting.

Rhea-AI Filing Summary

Century Therapeutics, Inc. President and CEO Brent Pfeiffenberger had 31,172 shares of Common Stock withheld by the company to cover taxes tied to restricted stock units vesting. After this tax-withholding disposition, he holds 3,679,786 shares of Century Therapeutics Common Stock directly.

Insights

Equity compensation analyst

Routine tax withholding on RSU vesting; no open-market trade.

The transaction reflects 31,172 shares of Century Therapeutics Common Stock withheld at $2.34 per share to satisfy tax obligations on vesting restricted stock units. Code F events like this are mechanical and do not represent a buy or sell decision.

Following the withholding, President and CEO Brent Pfeiffenberger directly owns 3,679,786 shares. Because there was no open-market purchase or sale, this filing mainly updates ownership records rather than signaling a change in his view of the stock.

Insider Trade Summary

Exercise Price or Tax Liability: 31,172 shares

Exercise Price or Tax Liability 1 txn

Insider Pfeiffenberger Brent

Role President and CEO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	31,172	$2.34	$73K

Holdings After Transaction: Common Stock — 3,679,786 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.

Key Figures

Shares withheld for taxes: 31,172 shares Withholding price per share: $2.34 per share Shares owned after transaction: 3,679,786 shares +2 more

5 metrics

Shares withheld for taxes 31,172 shares Common Stock withheld to satisfy RSU tax obligations

Withholding price per share $2.34 per share Reported value for withheld Common Stock

Shares owned after transaction 3,679,786 shares Direct holdings after tax-withholding disposition

Transaction code F Payment of tax liability by delivering securities

Transaction direction dispose Tax-withholding disposition, not open-market sale

Key Terms

restricted stock units, tax withholding obligations, Common Stock, Payment of exercise price or tax liability by delivering securities

4 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

"31,172 shares of Common Stock withheld at $2.34 per share"

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.

Payment of exercise price or tax liability by delivering securities regulatory

"transaction code description: Payment of exercise price or tax liability by delivering securities"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Century Therapeutics (IPSC) report for Brent Pfeiffenberger?

Century Therapeutics reported a Form 4 for President and CEO Brent Pfeiffenberger showing 31,172 Common Stock shares withheld. These shares were retained by the issuer to satisfy tax withholding obligations related to the vesting of restricted stock units, not an open-market sale.

Was the IPSC Form 4 transaction an open-market sale of shares?

No, the Form 4 does not show an open-market sale. It records a tax-withholding disposition (code F) where 31,172 shares were withheld by the issuer to cover taxes on vested restricted stock units, a standard equity compensation process.

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

The filing shows 31,172 shares of Century Therapeutics Common Stock were withheld. These shares were used to satisfy tax withholding obligations arising from the vesting of restricted stock units granted to President and CEO Brent Pfeiffenberger, according to the footnote disclosure.

What is Brent Pfeiffenberger’s Century Therapeutics shareholding after this Form 4?

After the tax-withholding transaction, Brent Pfeiffenberger directly holds 3,679,786 Century Therapeutics Common Stock shares. This figure reflects his position following the issuer’s withholding of 31,172 shares to cover taxes on vested restricted stock units reported in the Form 4.

What does transaction code F mean in the Century Therapeutics (IPSC) Form 4?

Transaction code F indicates shares were used to pay an exercise price or tax liability. Here, 31,172 shares of Common Stock were withheld by Century Therapeutics to satisfy tax withholding obligations associated with the vesting of restricted stock units granted to the executive.

At what price per share were the withheld IPSC shares valued in this Form 4?

The 31,172 withheld shares were reported at a price of $2.34 per share. This price is used in the Form 4 to calculate the value of Century Therapeutics Common Stock applied toward covering the executive’s tax withholding obligations on his restricted stock unit vesting.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 05/19/2026 - 04:10 PM Learn about SEC filing dates

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)
05/15/2026

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	05/15/2026		F(1)		31,172	D	$2.34	3,679,786	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	05/19/2026
	** 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)