Shimmick (SHIM) COO RSUs vest with 8,463 shares withheld for taxes

Rhea-AI Filing Summary

Shimmick Corp Chief Operating Officer Sarah Beth Tacker reported routine equity compensation activity. On May 29, 2026, 26,596 Restricted Stock Units (RSUs) granted on April 29, 2026 fully vested and converted into 26,596 shares of common stock on a one-for-one basis.

To cover taxes due at vesting, 8,463 shares were disposed of through a tax-withholding transaction at $3.54 per share, rather than an open-market sale. After these transactions, Tacker directly holds 18,133 shares of Shimmick common stock, and 88,652 RSUs remain outstanding.

Insider Trade Summary

26,596 shares exercised/converted

Mixed 3 txns

Insider Tacker Sarah Beth

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	26,596	$0.00	--
Exercise	Common Stock, par value $0.01 per share	26,596	$0.00	--
Tax Withholding	Common Stock, par value $0.01 per share	8,463	$3.54	$30K

Holdings After Transaction: Restricted Stock Units — 88,652 shares (Direct, null); Common Stock, par value $0.01 per share — 26,596 shares (Direct, null)

Footnotes (1)

1. RSUs convert into common stock on a one-for-one basis. Represents shares withheld by the Company to pay taxes due following the vesting of previously granted Restricted Stock Units. On April 29, 2026, the Reporting Person was granted 26,596 RSUs which vested in full and settled into shares of common stock on May 29, 2026.

Key Figures

RSUs vested and converted: 26,596 shares Shares withheld for taxes: 8,463 shares Tax-withholding price: $3.54 per share +2 more

5 metrics

RSUs vested and converted 26,596 shares RSUs granted April 29, 2026; vested May 29, 2026

Shares withheld for taxes 8,463 shares Tax-withholding disposition at $3.54 per share

Tax-withholding price $3.54 per share Value used for 8,463-share tax-withholding transaction

Shares held after transaction 18,133 shares Common stock directly owned following Form 4 transactions

RSUs remaining outstanding 88,652 RSUs Restricted Stock Units outstanding after reported exercise

Key Terms

Restricted Stock Units, tax-withholding disposition, derivative security

3 terms

Restricted Stock Units financial

"The security title includes Restricted Stock Units that convert into common stock."

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 disposition financial

"Represents shares withheld by the Company to pay taxes due at vesting."

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

derivative security financial

"Exercise or conversion of derivative security is cited in the transaction description."

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

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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^*

Tacker Sarah Beth

(Last) (First) (Middle)

530 TECHNOLOGY DRIVE

SUITE 300

(Street)

IRVINE CALIFORNIA 92618

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Shimmick Corp [ SHIM ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Operating Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/29/2026

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, par value $0.01 per share	05/29/2026		M		26,596	A	(1)	26,596	D
Common Stock, par value $0.01 per share	05/29/2026		F		8,463(2)	D	$3.54	18,133	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
Restricted Stock Units	(1)	05/29/2026		M			26,596	(3)	(3)	Common Stock, par value $0.01 per sharere	26,596	$0	88,652	D

Explanation of Responses:

1. RSUs convert into common stock on a one-for-one basis.

2. Represents shares withheld by the Company to pay taxes due following the vesting of previously granted Restricted Stock Units.

3. On April 29, 2026, the Reporting Person was granted 26,596 RSUs which vested in full and settled into shares of common stock on May 29, 2026.

	John Carpenter, Power of Attorney for Sarah Tacker	06/02/2026
	** 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 insider transactions did Shimmick Corp (SHIM) report for Sarah Beth Tacker?

Shimmick Corp reported that COO Sarah Beth Tacker had 26,596 RSUs vest and convert into common stock, with 8,463 shares withheld to pay taxes. These are routine compensation-related transactions rather than open-market purchases or sales.

Did the Shimmick (SHIM) COO buy or sell shares on the open market?

The filing shows no open-market buy or sell by the COO. Shares were acquired via RSU vesting and a portion, 8,463 shares, was withheld by the company to cover taxes, which is a non-market, administrative disposition.

How many Shimmick (SHIM) shares and RSUs does the COO hold after these transactions?

After the reported transactions, COO Sarah Beth Tacker directly holds 18,133 shares of Shimmick common stock and 88,652 RSUs. The RSUs represent additional potential future shares that may be delivered upon vesting, subject to applicable terms.

What price per share was used for the Shimmick (SHIM) tax-withholding transaction?

The tax-withholding disposition used a price of $3.54 per share for 8,463 shares. This price is used solely for determining the value of shares withheld to satisfy tax obligations at vesting, not as an open-market trade price.

What do the vested RSUs for Shimmick (SHIM) convert into?

The vested Restricted Stock Units convert into Shimmick common stock on a one-for-one basis. In this filing, 26,596 RSUs converted into 26,596 common shares when they vested, reflecting equity compensation becoming actual share ownership.