# EDGAR Filing Document

**Accession Number:** 0001680062
**File Stem:** 0001680062-26-000020
**Filing Date:** 2026-2
**Character Count:** 27513
**Document Hash:** 774eb0fe664b7188ddff052610b4b8a3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001680062-26-000020.hdr.sgml**: 20260206

**ACCESSION NUMBER**: 0001680062-26-000020

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20260206

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260206

**DATE AS OF CHANGE**: 20260206

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ACM Research, Inc.
- **CENTRAL INDEX KEY:** 0001680062
- **STANDARD INDUSTRIAL CLASSIFICATION:** SPECIAL INDUSTRY MACHINERY, NEC [3559]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000
- **STATE OF INCORPORATION:** CA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38273
- **FILM NUMBER:** 26605266

**BUSINESS ADDRESS:**
- **STREET 1:** 42307 OSGOOD ROAD, SUITE I
- **CITY:** FREMONT
- **STATE:** CA
- **ZIP:** 94539
- **BUSINESS PHONE:** 510-445-3700

**MAIL ADDRESS:**
- **STREET 1:** 42307 OSGOOD ROAD, SUITE I
- **CITY:** FREMONT
- **STATE:** CA
- **ZIP:** 94539

?xml version='1.0' encoding='ASCII'? acmr-20260206

**UNITED STATES SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

Date of Report (Date of earliest event reported): February 6, 2026

**ACM Research, Inc.**

*(Exact Name of Registrant as Specified in its Charter)*

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| | | |
|:---|:---|:---|
| **Delaware** | **001-38273** | **94-3290283** |
| *(State or Other Jurisdiction of Incorporation)* | *(Commission File Number)* | *(IRS Employer Identification No.)* |

---

---

| | |
|:---|:---|
| **42307 Osgood Road, Suite I**<br>**Fremont, California** | **94539** |
| *(Address of Principal Executive Offices)* | *(Zip Code)* |

---

Registrant's telephone number, including area code: **(510) 445-3700**

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

□ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

□ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

□ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

□ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading symbol** | **Name of each exchange on which registered** |
| Class A Common Stock, par value $0.0001 per share | ACMR | The Nasdaq Stock Market LLC |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934:Emerging growth company □

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. □

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**Item 8.01 Other Events.**

As previously disclosed, on January 30, 2026, ACM Research (Shanghai), Inc. ("ACM Shanghai"), the operating subsidiary of ACM Research, Inc. (the "Company") issued a notice to the Shanghai Stock Exchange (the "SSE") that the Company intends to sell 4,801,648 shares (the "Shares") of ACM Shanghai through an inquiry-based share transfer plan (the "Plan"). On February 2, 2026, ACM Shanghai issued a subsequent notice (the "Pricing Notice") to the SSE announcing RMB 160.00 (approximately $23.05) as the preliminarily determined transfer price per Share to be sold under the Plan. On February 6, 2026, ACM Shanghai issued a second subsequent notice (the "Results Notice") to the SSE announcing the Company sold 4,801,648 Shares at a price of RMB 160.00 (approximately $23.05) per Share. Upon completion of the sale of the Shares under the Plan, the Company's aggregate ownership percentage in ACM Shanghai decreased from 74.84% to 73.72%. A copy of the Results Notice is attached as Exhibit 99.1 hereto.

The information in this Current Report on Form 8-K, including Exhibit 99.1, is intended to be furnished and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section, nor shall it be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended.

This Current Report on Form 8-K contains forward-looking statements that involve risks and uncertainties. These risks and uncertainties include market conditions, judicial freezing, enforcement, compulsory disposition, completion of the sale of the Shares through the China Securities Depository and Clearing Corporation Limited, Shanghai Branch, and other risks detailed from time to time in the Company's periodic reports and other filings with the U.S. Securities and Exchange Commission. You are cautioned not to place undue reliance on forward-looking statements, which are based on the Company's current intentions, expectations and assumptions and speak only as of the date of this Current Report on Form 8-K. The Company does not intend to revise or update any forward-looking statement in this Current Report on Form 8-K as a result of new information, future events or otherwise, except as required by law.

**Item 9.01&nbsp;&nbsp;&nbsp;&nbsp;Financial Statements and Exhibits.**

**(d)&nbsp;&nbsp;&nbsp;&nbsp;Exhibits.**

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| | |
|:---|:---|
| **Exhibit** | **Description** |
| <u>[99](a25_acmshxresultsofshareho.htm)[.1](a25_acmshxresultsofshareho.htm)</u>\*<br>104 | ACM Research (Shanghai), Inc. Report on Results of Shareholder Inquiry-Based Transfer and Indicative Announcement of Change in Equity by Shareholders Holding 5% or More of Shares Reaching an Integer Multiple of 1%, submitted by ACM Research, Inc. to the Shanghai Stock Exchange on February 6, 2026.<br>Cover Page Interactive Data File (embedded within the XBRL document) |

---

\* Unofficial English translation of original document prepared in Mandarin Chinese.

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**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

ACM RESEARCH, INC.

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Mark McKechnie</u>________________________

&nbsp;&nbsp;&nbsp;&nbsp;Mark McKechnie

Chief Financial Officer and Treasurer

Dated: February 6, 2026

## Exhibit 99.1

Exhibit 99.1

Stock Code: 688082&nbsp;&nbsp;&nbsp;&nbsp;Stock Abbreviation: ACM Shanghai&nbsp;&nbsp;&nbsp;&nbsp;Announcement No.: 2026-005

**ACM Research (Shanghai), Inc.**

**Report on Results of Shareholder Inquiry-Based Transfer and Indicative Announcement on Change in Equity by Shareholders Holding 5% or More of Shares Reaching an Integer Multiple of 1%**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ACM RESEARCH, INC. (hereinafter referred to as "ACMR US" or the "Transferor") warrants that the information provided to ACM Research (Shanghai), Inc. (hereinafter referred to as the "Company" or "ACM Shanghai") contains no false records, misleading statements or material omissions, and is legally liable for its authenticity, accuracy and completeness thereof in accordance with the law.<br>ACM Shanghai and all members of its Board of Directors hereby warrant that the content of this announcement is consistent with the information provided by the person subject to disclosure obligations.<br>

**Important Notice:**

The price of the Inquiry-Based Transfer is RMB 160.00 per share, with a total of 4,801,648 shares being transferred.

ACMR US, the controlling shareholder of ACM Shanghai, participated in the Inquiry-Based Transfer. ACMR US is a company controlled by HUI WANG, the actual controller and Chairman of ACM Shanghai, and the Transferor in the Inquiry-Based Transfer is acting in concert with HUI WANG and Jian Wang, a Director and General Manager of ACM Shanghai.

ACM Shanghai has no operational risks that should be disclosed but have not been disclosed, nor does it have any other material matters that should be disclosed but have not been disclosed, under Section 2 of Chapter 8 of the Rules Governing the Listing of Stocks on the STAR Market of Shanghai Stock Exchange;

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Exhibit 99.1

This change in equity constitutes a reduction of shareholding and passive dilution, and the transfer will not result in a change of ACM Shanghai's controlling shareholder or actual controller.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Following this change in equity, the total shareholding percentage of the Transferor, ACMR US, and its parties acting in concert with it will decrease from 74.84% to 73.72%, with the change in equity interest held by them in ACM Shanghai reaching an integer multiple of 1%.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**I. Details on the Transferor**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(I) Basic Information of the Transferor** 

As of January 30, 2026, the number of shares held by the Transferor and its shareholding percentage in ACM Shanghai are as follows:

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| | | | |
|:---|:---|:---|:---|
| **S.N.** | **Name of Shareholder** | **Number of Shares Held (shares)** | **Percentage of Total Share Capital** |
| 1 | ACMR US | 357692308 | 74.49% |

---

&nbsp;&nbsp;&nbsp;&nbsp;Note: The above shareholding percentage is calculated based on ACM Shanghai's total share capital of 480,164,789 shares as of January 30, 2026.

The Transferor, ACMR US, in the Inquiry-Based Transfer is the controlling shareholder of ACM Shanghai, and a company controlled by HUI WANG, the actual controller and Chairman of ACM Shanghai, and the Transferor in the Inquiry-Based Transfer is a party acting in concert with HUI WANG and Jian Wang, a Director and General Manager of ACM Shanghai, and the concert parties collectively hold more than 5% of the total share capital of ACM Shanghai.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(II) Explanation on the Acting-in-Concert Relationship of the Transferor and Specific Circumstances**

The Transferor, ACMR US, in the Inquiry-Based Transfer is acting in concert with HUI WANG, the actual controller and Chairman of ACM Shanghai, and Jian Wang, a Director and General Manager of ACM Shanghai.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(III) Specific Details on the Transfer**

------

Exhibit 99.1

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| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| **S.N.** | **Name of Shareholder** | **Number of Shares Held (shares)** | **Shareholding Percentage** | **Number of Shares Intended to be Transferred (shares)** | **Number of Shares Actually Transferred**<br>**(shares)** | **Number of Shares Actually Transferred as a Percentage of Total Share Capital** | **Shareholding Persentage After Transfer** |
| 1 | ACMR US | 357692308 | 74.49% | 4801648 | 4801648 | 1.00% | 73.49% |
|  | **Total** | **357692308** | **74.49%** | **4801648** | **4801648** | **1.00%** | **73.49%** |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(IV) Reasons for the Transferor's Failure to Transfer and Its Impact**

□ Applicable √ Not applicable

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**II. Details on the Changes in Equity of the Transferor**

√ Applicable □ Not applicable

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(I) ACMR US and Its Acting-in-Concert Parties**

From November 4, 2025 to November 20, 2025, HUI WANG, ACM Shanghai's actual controller and Chairman, reduced his shareholding in ACM Shanghai by a total of 199,794 shares through centralized bidding transactions, representing 0.04% of ACM Shanghai's total share capital at that time; and from November 5, 2025 to November 21, 2025, Jian Wang, a Director, General Manager, and core technician of ACM Shanghai, who is a party acting in concert, reduced his shareholding in ACM Shanghai by a total of 148,104 shares through centralized bidding transactions, representing 0.03% of ACM Shanghai's total share capital at that time. For more details thereon, please refer to ACM Shanghai's *Announcement on Results of Shareholding Reduction by Actual Controller and Parties Acting in Concert, Certain Directors and Senior Management (Announcement No. 2025-087) dated November 22, 2025*.

On November 7, 2025, after the completion of share registration for the first batch of vested shares under the first vesting period of the reserved grant portion of

------

Exhibit 99.1

ACM Shanghai's 2023 Restricted Stock Incentive Plan, ACM Shanghai's total share capital increased from 479,892,514 shares to 480,164,789 shares, resulting in that the shareholding percentages of ACMR US and its acting-in-concert parties, HUI WANG and Jian Wang, in ACM Shanghai was passively diluted accordingly.

On February 6, 2026, ACMR US reduced its shareholding in ACM Shanghai by 4,801,648 through the Inquiry-Based Transfer, representing 1.00% of ACM Shanghai's total share capital.

Following this change in equity, the aggregate shareholding percentage of ACMR US and its acting-in-concert parties in ACM Shanghai will decrease from 74.84% to 73.72%. This change in equity will not result in a change in ACM Shanghai's controlling shareholder or actual controller.

The Transferor, ACMR US, in the Inquiry-Based Transfer, is acting in concert with HUI WANG, ACM Shanghai's actual controller and Chairman, and Jian Wang, a Director and General Manager of ACM Shanghai.

In summary, the aggregate shareholding percentage of ACMR US and its parties acting in concert decreased from 74.84% to 73.72%, with the change in equity interests held in ACM Shanghai reaching an integer multiple of 1%.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**1. Basic Information**

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| | | |
|:---|:---|:---|
| Basic Information on ACM US | Name | ACM RESEARCH, INC. |
| Basic Information on ACM US | Address | c/o Corporation Service Company,251 Little Falls Drive, County of New Castle, Wilmington, Delaware 19808 |
| Basic Information on ACM US | Date of Change in Equity  | February 6, 2026 |
| Basic Information on HUI WANG | Name | HUI WANG |
| Basic Information on HUI WANG | Address | Buildings 5, 6, 7, 8, Lane 999, Dangui Road, China (Shanghai) Pilot Free Trade Zone |
| Basic Information on HUI WANG | Date of Change in Equity | November 20, 2025 |
| Basic Information on Jian Wang | Name | Jian Wang |
| Basic Information on Jian Wang | Address | Buildings 5, 6, 7, 8, Lane 999, Dangui Road, China (Shanghai) Pilot Free Trade Zone |
| Basic Information on Jian Wang | Date of Change in Equity  | November 21, 2025 |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**2. Specific Details on this Change in Equity**

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Exhibit 99.1

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Name of Shareholder** | **Method of Change** | **Date of Change** | **Type of Equity** | **Number of Shares Reduced (shares)** | **Percentage of Percentage**<br>**Reduction** |
| ACMR US | Others | November 7, 2025 | RMB Ordinary Shares | 0 | 0.04% |
| ACMR US | Inquiry-Based Transfer | February 5, 2026 | RMB Ordinary Shares | 4801648 | 1.00% |
| ACMR US | **Total** | **-** | **-** | **4801648** | **1.04%** |
| HUI WANG | Centralized Bidding | November 4–20, 2025 | RMB Ordinary Shares | 199794 | 0.04% |
| HUI WANG | Others | November 7, 2025 | RMB Ordinary Shares | 0 | 0.00% |
| HUI WANG | **Total** | **-** | **-** | **199794** | **0.04%** |
| Jian Wang | Centralized Bidding | November 5–21, 2025 | RMB Ordinary Shares | 148104 | 0.03% |
| Jian Wang | Others | November 7, 2025 | RMB Ordinary Shares | 0 | 0.00% |
| Jian Wang | **Total** | **-** | **-** | **148104** | **0.03%** |

---

Notes: (1) "Others" in the Method of Change refers to the increase in ACM Shanghai's total share capital and the passive dilution of the shareholding percentage of ACMR US and its acting-in-concert parties, HUI WANG and Jian Wang, due to the completion of share registration for the first batch of vested shares under the first vesting period of the reserved grant portion of ACM Shanghai's 2023 Restricted Stock Incentive Plan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) The "Percentage of Shareholding Reduction" is calculated based on ACM Shanghai's total share capital at the time of the occurrence of the change in equity, and minor discrepancies may result from rounding off.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**3. Changes in Equity Owned by the Investor and Its Acting-in-Concert Parties in ACM Shanghai before and after this Change in Equity** 

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Name of Shareholder** | **Nature of Shares** | **Shares Held before this Transfer** | **Shares Held before this Transfer** | **Shares Held after this Transfer** | **Shares Held after this Transfer** |
| **Name of Shareholder** | **Nature of Shares** | **Number of Shares (shares)** | **Percentage of Total Share Capital** | **Number of Shares (shares)** | **Percentage of Total Share Capital** |
| ACMR US | Total Shares Held | 357692308 | 74.54% | 352890660 | 73.49% |
| ACMR US | in which: unrestricted shares  | 357692308 | 74.54% | 352890660 | 73.49% |
| HUI WANG | Total Shares Held | 850962 | 0.18% | 651168 | 0.14% |
| HUI WANG | in which: unrestricted shares | 312500 | 0.07% | 112706 | 0.02% |

---

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Exhibit 99.1

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| Jian Wang | Total Shares Held | 592755 | 0.12% | 444651 | 0.09% |
| Jian Wang | in which: unrestricted shares | 294293 | 0.06% | 146189 | 0.03% |
| **Total** | **Total Shares Held** | **359136025** | **74.84%** | **353986479** | **73.72%** |
| **Total** | **in which: unrestricted shares** | **358299101** | **74.66%** | **353149555** | **73.55%** |

---

Note: The term "before this Transfer" refers to the period before this change in equity, specifically after the completion of registration for the new shares issued by ACM Shanghai to specific investors for the year of 2024 on September 26, 2025; and the term "after this Transfer" refers to the period after this change in equity, specifically after the completion of this Inquiry-Based Transfer.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**III. Details on the Transferees**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **(I) Information on the Transfer**

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **S.N.** | **Name of Transferee** | **Type of Investor** | **Number of Shares Actually Transferred (shares)** | **Number of Shares Transferred as a Percentage of Total Share Capital** | **Lock-up Period (months)** |
| 1 | China Asset Management Co., Ltd. | Fund Management Company | 1370000 | 0.29% | 6 months |
| 2 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nuode Fund Management Co., Ltd. | Fund Management Company | 735500 | 0.15% | 6 months |
| 3 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Guotai Fund Management Co., Ltd. | Fund Management Company | 415148 | 0.09% | 6 months |
| 4 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Caitong Fund Management Co., Ltd. | Fund Management Company | 330500 | 0.07% | 6 months |
| 5 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Huian Fund Management Co., Ltd. | Fund Management Company | 288000 | 0.06% | 6 months |
| 6 | UBS AG | Qualified Foreign Institutional Investor (QFII) | 249000 | 0.05% | 6 months |
| 7 | Shenwan Hongyuan Securities Co., Ltd. | Securities Company | 180000 | 0.04% | 6 months |
| 8 | E Fund Management Co., Ltd. | Fund Management Company | 161000 | 0.03% | 6 months |
| 9 | Shanghai Zhinan Xingyuan Private Fund Management Co., Ltd. | Private Fund Manager | 100000 | 0.02% | 6 months |

---

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Exhibit 99.1

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| 10 | Shangrong Capital Management Co., Ltd. | Private Fund Manager | 80000 | 0.02% | 6 months |
| 11 | Morgan Stanley International Holdings Inc. | Qualified Foreign Institutional Investor (QFII) | 74000 | 0.02% | 6 months |
| 12 | Shenzhen Commander Capital Management Co., Ltd. | Private Equity Fund Manager | 65000 | 0.01% | 6 months |
| 13 | J.P. Morgan Securities plc | Qualified Foreign Institutional Investor (QFII) | 62000 | 0.01% | 6 months |
| 14 | Sichuan Development Securities Investment Fund Management Co., Ltd. | Private Fund Manager | 62000 | 0.01% | 6 months |
| 15 | Yuhui Capital Management (Beijing) Co., Ltd. | Private Fund Manager | 62000 | 0.01% | 6 months |
| 16 | Shanghai Jinde Private Fund Management Co., Ltd. | Private Fund Manager | 62000 | 0.01% | 6 months |
| 17 | Qingdao Luxiu Investment Management Co., Ltd. | Private Fund Manager | 60000 | 0.01% | 6 months |
| 18 | Guolian Securities Asset Management Co., Ltd. | Securities Company | 52000 | 0.01% | 6 months |
| 19 | Bodao Fund Management Co., Ltd. | Fund Management Company | 52000 | 0.01% | 6 months |
| 20 | Yuekai Innovation Investment Co., Ltd. | Private Fund Manager | 31500 | 0.01% | 6 months |
| 21 | Huatai-PineBridge Fund Management Co., Ltd. | Fund Management Company | 31000 | 0.01% | 6 months |
| 22 | Shenzhen Junzi Qianqian Private Securities Investment Fund Management Co., Ltd. | Private Fund Manager | 31000 | 0.01% | 6 months |

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Exhibit 99.1

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| 23 | Zhejiang Ruijiu Equity Investment Co., Ltd. | Private Fund Manager | 31000 | 0.01% | 6 months |
| 24 | Shanghai Muxin Private Fund Management Co., Ltd. | Private Fund Manager | 31000 | 0.01% | 6 months |
| 25 | Shanghai Chengzhou Investment Management Co., Ltd. | Private Fund Manager | 31000 | 0.01% | 6 months |
| 26 | Guohai Securities Co., Ltd. | Securities Company | 31000 | 0.01% | 6 months |
| 27 | Shanghai Kunyang Private Fund Management Co., Ltd. | Private Fund Manager | 31000 | 0.01% | 6 months |
| 28 | Ningbo Ningju Asset Management Center (Limited Partnership) | Private Fund Manager | 31000 | 0.01% | 6 months |
| 29 | "Hangzhou Zhongda Junyue Investment Co., Ltd. | Private Fund Manager | 31000 | 0.01% | 6 months |
| 30 | "Zhijian (Shaoxing Keqiao) Private Fund Management Co., Ltd. | Private Fund Manager | 31000 | 0.01% | 6 months |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total** | **4801648** | **1.00%** |  |

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Note: Any discrepancies in mantissa between the total value and the sum of individual values in the table above are caused by rounding off.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(II) Inquiry Process of the Inquiry-Based Transfer**

The Transferor and Guotai Haitong Securities Co., Ltd. (hereinafter referred to as the "Organizing Securities Company") have jointly determined the floor price for the Inquiry-Based Transfer through consultation, taking into account factors such as the shareholder's own capital needs, and the floor price for the Inquiry-Based Transfer shall not be lower than 70% of the average trading price of ACM Shanghai's shares over the 20 trading days preceding the date of issuance of the Subscription Invitation Letter (i.e., January 30, 2026, inclusive) (the average trading price of the shares over the 20 trading days preceding the date of issuance of the Subscription Invitation Letter = total value of shares traded over the 20 trading days preceding the date of issuance

------

Exhibit 99.1

of the Subscription Invitation Letter / total volume of shares traded over the 20 trading days preceding the date of issuance of the Subscription Invitation Letter).

The Subscription Invitation Letter for the Inquiry-Based Transfer has been delivered to 274 institutional investors in total, specifically including: 73 fund management companies, 57 securities companies, 28 insurance companies, 11 qualified foreign investors, 99 private fund managers, 3 bank wealth management institutions,2 trust companies, and 1 futures company.

Within the valid application period set forth in the Subscription Invitation Letter, i.e., from 7:15:00 to 9:15:59 on February 2, 2026, the Organizing Broker received a total of 46 Subscription Quotation Forms from 38 institutional investors, in which, 45 quotations were valid and 1 quotation was invalid. All investors participating in the application have submitted their relevant application documents in a timely manner.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(III) Results of Inquiry**

The Organizing Broker received a total of 46 Subscription Quotation Forms from 38 institutional investors, in which, 45 quotations were valid. Pursuant to the pricing principles set forth in the Subscription Invitation Letter, shares were ultimately allocated to 30 investors, and the finally confirmed price for the Inquiry-Based Transfer was RMB 160.00 per share, with a total of 4,801,648 shares being transferred.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(IV) Whether the Transfer will Results in a Change of Control of ACM Shanghai**

□ Applicable √ Not applicable

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(V) Failure of the Transferees to Subscribe for Shares**

□ Applicable √ Not applicable

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**IV. Details on the Changes in Equity of the Transferees**

□ Applicable √ Not applicable

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**V. Verification Process and Opinion of the Intermediary Institution**

------

Exhibit 99.1

Guotai Haitong Securities Co., Ltd. has conducted prudent verification of the Transferor, transferees, qualifications of inquiry participants to subscribe for shares, and the scope of distributing the Subscription Invitation Letter for the Inquiry-Based Transfer, etc., and it is of the opinion that:

The process of the Inquiry-Based Transfer complies with the principles of fairness and impartiality, and is in accordance with the prevailing regulatory requirements in the securities market. The final price for the share transfer was determined through the inquiry-based method. The entire Inquiry-Based Transfer process is in compliance with the relevant provisions of the *Company Law of the People's Republic of China*, the *Securities Law of the People's Republic of China*, the *Implementation Opinions on Establishing the STAR Market and Piloting Registration System in Shanghai Stock Exchange*, the *Measures for Continuous Supervision on Companies Listed on the STAR Market (for Trial Implementation)*, the *Rules Governing the Listing of Stocks on the STAR Market of the Shanghai Stock Exchange (Revised April 2025*), and the *Guidelines No. 4 of the Shanghai Stock Exchange for Self-Regulation of Listed Companies on the STAR Market —Inquiry-Based Transfer and Placement (Revised March 2025)*, and other laws and regulations, departmental rules and normative documents.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**VI. Attachment to Online Announcement**

*Verification Report of Guotai Haitong Securities Co., Ltd. on the Inquiry-Based Transfer of Shares by Shareholders of ACM Research (Shanghai), Inc. to Specific Institutional Investors*

This Announcement is hereby issued.

ACM Research (Shanghai), Inc.

Board of Directors

February 6, 2026

<br>