AECOM reports 18.7% stake in Shimmick Corp

Rhea-AI Filing Summary

AECOM reports updated beneficial ownership of Shimmick Corp common stock on an amended Schedule 13D. AECOM has beneficial ownership of 7,745,000 shares of Shimmick common stock, representing 18.7% of the outstanding class, based on 41,335,823 shares outstanding as of August 7, 2026.

The position includes 6,708,051 shares held directly and 1,036,949 additional shares that AECOM may acquire voting and dispositive power over within 60 days under an Escrow Services Agreement with Shimmick and Equiniti Trust Company, LLC. AECOM has sole voting and dispositive power over the reported shares.

Filing Explained

AECOM’s 18.7% figure is recalculated using Shimmick’s August 7 share count, without a stated increase in its reported 7,745,000 shares.

This Amendment No. 3 updates AECOM's reported ownership percentage because the number of Shimmick shares outstanding changed; it continues to report 7,745,000 shares and 18.7% beneficial ownership.

The filing bases that percentage on 41,335,823 shares outstanding as of August 7, 2026, so the disclosed structural change is a denominator update rather than a stated increase in AECOM's reported share total.

Schedule 13D amendments track changes in stake or intent as stated; this amendment specifically states that it updates the percentage calculation and Schedule 1.

Key Figures

Beneficially owned shares: 7,745,000 shares Ownership percentage: 18.7% Shares outstanding: 41,335,823 shares +4 more

7 metrics

Beneficially owned shares 7,745,000 shares Shares of Shimmick Corp common stock beneficially owned by AECOM

Ownership percentage 18.7% Percent of Shimmick Corp common stock represented by AECOM’s holdings

Shares outstanding 41,335,823 shares Shimmick Corp common stock outstanding as of August 7, 2026

Directly held shares 6,708,051 shares Shimmick Corp common stock directly held by AECOM

Escrow-related shares 1,036,949 shares Shares AECOM may acquire voting and dispositive power over within 60 days under Escrow Services Agreement

Sole voting power 7,745,000 shares Shares over which AECOM has sole voting power

Sole dispositive power 7,745,000 shares Shares over which AECOM has sole dispositive power

Key Terms

beneficially owned, sole voting power, sole dispositive power, Escrow Services Agreement, +1 more

5 terms

beneficially owned financial

"Aggregate amount beneficially owned by each reporting person 7,745,000.00"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: Sole Voting Power 7,745,000.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: Sole Dispositive Power 7,745,000.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Escrow Services Agreement financial

"may acquire voting and dispositive power within 60 days hereof pursuant to the terms of the Escrow Services Agreement"

Schedule 13D regulatory

"previously filed a statement on Schedule 13G to report the acquisition"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

FAQ

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

How many Shimmick Corp (SHIM) shares does AECOM beneficially own?

AECOM beneficially owns 7,745,000 shares of Shimmick Corp common stock. This total includes directly held shares and additional shares over which AECOM may obtain voting and dispositive power pursuant to an Escrow Services Agreement.

What percentage of Shimmick Corp (SHIM) does AECOM’s stake represent?

AECOM’s reported holdings represent 18.7% of Shimmick Corp’s outstanding common stock. This percentage is calculated using 41,335,823 shares outstanding as of August 7, 2026, as reported in Shimmick’s Form 10-Q.

How many Shimmick Corp (SHIM) shares does AECOM hold directly?

AECOM holds 6,708,051 shares of Shimmick Corp common stock directly. These directly held shares form the majority of its total reported beneficial ownership position in the company’s common stock.

What portion of AECOM’s Shimmick (SHIM) stake is tied to the Escrow Services Agreement?

AECOM’s position includes 1,036,949 shares of Shimmick common stock linked to an Escrow Services Agreement. AECOM may acquire voting and dispositive power over these shares within 60 days under that agreement with Shimmick and Equiniti Trust Company, LLC.

Does AECOM report sole or shared voting power over its Shimmick (SHIM) shares?

AECOM reports sole voting power over 7,745,000 shares of Shimmick Corp common stock. It also reports sole dispositive power over the same number of shares, with no shared voting or dispositive power disclosed.

Why did AECOM file Amendment No. 3 related to Shimmick Corp (SHIM)?

Amendment No. 3 was filed to update AECOM’s ownership percentage in Shimmick Corp. The change results from an updated number of Shimmick common shares outstanding and includes an update to a related schedule of directors and officers.

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

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Available on EDGAR 08/12/2026 - 04:09 PM Accepted by SEC EDGAR 08/12/2026 - 04:09 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 3)

Shimmick Corp

(Name of Issuer)

Common stock, par value $0.01 per share

(Title of Class of Securities)

82455M109

(CUSIP Number)

David Y. Gan
EVP, Chief Legal Officer, AECOM, 300 South Grand Avenue
Los Angeles, CA, 90071
(213) 593-8000

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

08/10/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 82455M109

1

Name of reporting person

AECOM

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 7,745,000.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 7,745,000.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

7,745,000.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

18.7 %

14

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person:

The amounts in rows 7, 9 and 11 and the percentage in row 13 include (i) 6,708,051 shares of the Shimmick Corporation's (the "Issuer") common stock, par value $0.01 per share ("Common Stock"), directly held by the Reporting Person and (ii) 1,036,949 additional shares of Common Stock of which the Reporting Person may acquire voting and dispositive power within 60 days hereof pursuant to the terms of the Escrow Services Agreement dated June 24, 2024, by and among the Issuer, the Reporting Person and Equiniti Trust Company, LLC.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common stock, par value $0.01 per share
(b)	Name of Issuer: Shimmick Corp
(c)	Address of Issuer's Principal Executive Offices: 530 TECHNOLOGY DRIVE, SUITE 300, IRVINE, CALIFORNIA , 92618.
Item 1 Comment: This Amendment No. 3 ("Amendment No. 3") to Schedule 13D amends and supplements the initial statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") by the Reporting Person on May 24, 2024 (as amended prior to the filing of this Amendment No. 3, the "Schedule 13D"). This Amendment No. 3 is being filed to reflect a change in the percentage of the Common Stock owned by the Reporting Person as a result of a change in the number of shares of Common Stock outstanding and to update Schedule 1. Capitalized terms used but not defined in this Amendment No. 3 shall have the same meanings ascribed to them in the Schedule 13D.
Item 2.	Identity and Background
(c)	Item 2 (c) of the Schedule 13D is hereby amended and restated to read as follows: (c) The principal business of the Reporting Person is providing professional infrastructure consulting services for governments, businesses and organizations. The directors and executive officers of the Reporting Person are listed on Schedule I attached hereto, which is incorporated herein by reference into this Item 2 ("Schedule 1").
Item 5.	Interest in Securities of the Issuer
(a)	Items 5(a) of the Schedule 13D is hereby amended and restated to read as follows: (a) The information set forth in Items 7-13 of the cover page is hereby incorporated by reference into this Item 5(a). The percentage calculations herein are based upon 41,335,823 shares of Common Stock issued and outstanding as of August 7, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q, filed with the SEC on August 10, 2026.
(b)	Item 5(b) of the Schedule 13D is hereby amended and restated to read as follows: (b) The information set forth in Items 7-13 of the cover page is hereby incorporated by reference into this Item 5(b) .

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

AECOM

Signature:	/s/ David Y. Gan
Name/Title:	David Y. Gan/Executive Vice President, Chief Legal Officer
Date:	08/12/2026