Sangamo SVP covers taxes with 4,036 share transfer

Sangamo Therapeutics senior vice president and chief development officer Nathalie Dubois-Stringfellow reported a tax-related share disposition.

Rhea-AI Filing Summary

Sangamo Therapeutics senior vice president and chief development officer Nathalie Dubois-Stringfellow reported a tax-related share disposition. She surrendered 4,036 shares of common stock at a value of $0.1743 per share to cover mandatory tax withholding on a restricted stock unit (RSU) vesting that occurred on May 25, 2026.

This transaction is classified as a required tax-withholding disposition to the company, not a discretionary open-market trade. After the withholding, she directly holds 328,733 shares of common stock. The vesting relates to a February 25, 2025 RSU grant under the company’s 2018 equity incentive plan.

Insider Trade Summary

Exercise Price or Tax Liability: 4,036 shares

Exercise Price or Tax Liability 1 txn

Insider Dubois-Stringfellow Nathalie

Role SVP-CHIEF DEVELOPMENT OFFICER

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	4,036	$0.1743	$703.47

Holdings After Transaction: Common Stock — 328,733 shares (Direct)

Footnotes (2)

1. F1. Represents shares underlying the portion of an RSU grant that vested on May 25, 2026, which were surrendered by the Reporting Person solely for mandatory tax withholding purposes using the Issuer's closing stock price on May 25, 2026 of $0.1743/share, pursuant to the terms of the 2018 EIP. This required tax withholding transaction is deemed to constitute a disposition of these shares to the Issuer for reporting purposes and does not represent a discretionary trade by the Reporting Person in the open market or otherwise.
2. F2. Includes: 7,214 shares from the May 25, 2026 vesting installment of the Reporting Person's February 25, 2025 RSU grant and the remaining 78,750 shares will vest in 7 successive equal quarterly installments thereafter. The vesting of all such RSU grants is subject to the Reporting Person's Continuous Service (as defined in the 2018 EIP) through each such date and subject to acceleration as provided in the 2018 EIP.

Key Figures

Shares surrendered for tax withholding: 4,036 shares Withholding reference price: $0.1743 per share Shares held after transaction: 328,733 shares +3 more

6 metrics

Shares surrendered for tax withholding 4,036 shares RSU vesting on May 25, 2026

Withholding reference price $0.1743 per share Issuer closing stock price on May 25, 2026

Shares held after transaction 328,733 shares Post-transaction direct ownership

RSU shares vested 7,214 shares May 25, 2026 installment of Feb. 25, 2025 RSU grant

Unvested RSU shares remaining 78,750 shares To vest in seven equal quarterly installments

Remaining vesting installments 7 installments Successive equal quarterly vesting schedule

Key Terms

RSU, 2018 EIP, Continuous Service, mandatory tax withholding, +1 more

5 terms

RSU financial

"Represents shares underlying the portion of an RSU grant that vested on May 25, 2026"

Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.

2018 EIP financial

"pursuant to the terms of the 2018 EIP"

Continuous Service financial

"subject to the Reporting Person's Continuous Service (as defined in the 2018 EIP)"

mandatory tax withholding financial

"surrendered by the Reporting Person solely for mandatory tax withholding purposes"

disposition of these shares to the Issuer financial

"This required tax withholding transaction is deemed to constitute a disposition of these shares to the Issuer"

FAQ

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

What did Sangamo (SGMO) executive Nathalie Dubois-Stringfellow report on this Form 4?

She reported a disposition of 4,036 Sangamo common shares for mandatory tax withholding. The shares were surrendered to the company in connection with an RSU vesting, rather than sold in the open market or as a discretionary trade.

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

No. The Form 4 describes shares surrendered solely for mandatory tax withholding on an RSU vesting. The filing states this required withholding is deemed a disposition to the issuer and does not represent a discretionary open-market trade by the reporting person.

How many Sangamo (SGMO) shares does Nathalie Dubois-Stringfellow hold after this tax-withholding event?

After the tax-withholding disposition of 4,036 shares, she directly holds 328,733 shares of Sangamo common stock. This figure comes from the post-transaction ownership line in the Form 4, showing her remaining equity stake following the required withholding.

What RSU grant was involved in this Sangamo (SGMO) Form 4 filing?

The filing references a February 25, 2025 RSU grant. On May 25, 2026, 7,214 shares from this grant vested, and a portion of those vested shares was surrendered to cover taxes, pursuant to Sangamo’s 2018 Equity Incentive Plan (2018 EIP).

How will the remaining RSUs for the Sangamo (SGMO) executive vest over time?

The filing notes 78,750 shares from the February 25, 2025 RSU grant remain unvested. These are scheduled to vest in seven successive equal quarterly installments, subject to the executive’s continuous service and any acceleration provisions in the 2018 Equity Incentive Plan.

Why is the Sangamo (SGMO) Form 4 transaction labeled as a tax-withholding disposition?

The Form 4 footnote explains the RSU shares were surrendered solely for mandatory tax withholding, using the issuer’s May 25, 2026 closing price of $0.1743 per share. For reporting purposes, this is treated as a disposition to the issuer, not a voluntary sale.

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

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Accepted by SEC EDGAR 05/27/2026 - 07:30 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^*

Dubois-Stringfellow Nathalie

(Last) (First) (Middle)

C/O SANGAMO THERAPEUTICS, INC.

501 CANAL BLVD.

(Street)

RICHMOND CALIFORNIA 94804

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SANGAMO THERAPEUTICS, INC [ SGMO ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP-CHIEF DEVELOPMENT OFFICER

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/25/2026

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	05/25/2026		F		4,036(1)	D	$0.1743	328,733(2)	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 underlying the portion of an RSU grant that vested on May 25, 2026, which were surrendered by the Reporting Person solely for mandatory tax withholding purposes using the Issuer's closing stock price on May 25, 2026 of $0.1743/share, pursuant to the terms of the 2018 EIP. This required tax withholding transaction is deemed to constitute a disposition of these shares to the Issuer for reporting purposes and does not represent a discretionary trade by the Reporting Person in the open market or otherwise.

2. Includes: 7,214 shares from the May 25, 2026 vesting installment of the Reporting Person's February 25, 2025 RSU grant and the remaining 78,750 shares will vest in 7 successive equal quarterly installments thereafter. The vesting of all such RSU grants is subject to the Reporting Person's Continuous Service (as defined in the 2018 EIP) through each such date and subject to acceleration as provided in the 2018 EIP.

	/s/ Scott Willoughby, Attorney-in-Fact	05/27/2026
	** 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)