Century Therapeutics CEO has 31K shares withheld

Century Therapeutics, Inc. (IPSC) reported an insider tax-related share disposition by President and CEO Brent Pfeiffenberger.

Rhea-AI Filing Summary

Century Therapeutics, Inc. (IPSC) reported an insider tax-related share disposition by President and CEO Brent Pfeiffenberger. On 2026-08-14, 31,172 shares of common stock were withheld by the company at $1.92 per share to satisfy tax withholding obligations upon vesting of restricted stock units. After this withholding, Pfeiffenberger directly holds 3,634,302 shares of Century Therapeutics common stock.

Insider Trade Summary

Tax Withholding: 31,172 shares

Tax Withholding 1 txn

Insider Pfeiffenberger Brent

Role President and CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	31,172	$1.92	$60K

Holdings After Transaction: Common Stock — 3,634,302 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 Tax withholding price: $1.92 per share Shares held after transaction: 3,634,302 shares

3 metrics

Shares withheld for taxes 31,172 shares Shares of common stock withheld on 2026-08-14 for tax withholding obligations

Tax withholding price $1.92 per share Per-share value used for the 31,172 withheld shares

Shares held after transaction 3,634,302 shares Direct ownership of Century Therapeutics common stock after the withholding transaction

Key Terms

restricted stock units, tax withholding obligations, transaction code F

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

"to satisfy tax withholding obligations in connection with the vesting"

transaction code F financial

"transaction code F indicates payment of tax liability"

FAQ

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

What insider transaction did IPSC report for Brent Pfeiffenberger?

Century Therapeutics reported that Brent Pfeiffenberger had 31,172 shares of common stock withheld on 2026-08-14 to cover tax withholding obligations related to vesting restricted stock units, rather than an open-market sale.

Was the IPSC insider transaction a market sale of shares?

No. The filing states the 31,172 shares were withheld by the issuer to satisfy tax withholding obligations upon vesting of restricted stock units, not sold on the open market or through a trading plan.

What price was used for the IPSC tax withholding shares?

The tax-related share withholding used a price of $1.92 per share. This per-share value is reported for the 31,172 shares of Century Therapeutics common stock withheld to satisfy the CEO’s tax obligations.

How many IPSC shares does Brent Pfeiffenberger hold after this transaction?

Following the tax withholding transaction, Brent Pfeiffenberger directly holds 3,634,302 shares of Century Therapeutics common stock. This figure reflects his post-transaction direct ownership position as disclosed in the Form 4 filing.

What does transaction code F mean in the IPSC Form 4 filing?

Transaction code F indicates payment of tax liability by delivering or withholding securities. In this case, 31,172 shares of Century Therapeutics were withheld to satisfy tax obligations on vesting restricted stock units.

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

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Accepted by SEC EDGAR 08/18/2026 - 04:17 PM EDT 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)
08/14/2026

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	08/14/2026		F(1)		31,172	D	$1.92	3,634,302	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	08/18/2026
	** 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)