Is ACM Research Stock a Buy After Investment Firm Seldon Capital Initiated a Large Position?

What happened

According to a filing with the Securities and Exchange Commission dated November 14, 2025, investment management firm Seldon Capital LP disclosed a new position in ACM Research (NASDAQ:ACMR), adding 193,242 shares.

The estimated value of this position at quarter-end was $7.56 million, based on the reported holding as of September 30, 2025. The fund reported 70 total positions for the period.

What else to know

This is a new position, representing 2.66% of Seldon Capital's 13F AUM.

Top holdings after the filing:

• TLN: $30.14 million (10.6% of AUM)
• VT: $29.37 million (10.3% of AUM)
• CLS: $27.58 million (9.7% of AUM)
• VTI: $17.75 million (6.2% of AUM)
• ECH: $11.15 million (3.9% of AUM)

As of November 14, 2025, shares of ACM Research were priced at $31.51, and the one-year total return was 68.2%. The stock outperformed the S&P 500 by 57 percentage points.

Company Overview

Company Snapshot

• ACM Research develops and sells single-wafer wet cleaning equipment, electro-chemical plating systems, and advanced cleaning technologies for semiconductor manufacturing.
• The company sells proprietary equipment and technology solutions to integrated circuit manufacturers through a direct sales force and third-party representatives.
• ACM Research sells single-wafer wet cleaning equipment for manufacturing integrated chips worldwide.

ACM Research is a leading provider of advanced wafer processing equipment for the semiconductor industry, specializing in single-wafer cleaning and plating technologies. The company leverages proprietary innovations such as space alternated phase shift and timely energized bubble oscillation to address the needs of cutting-edge chip fabrication.

With a global customer base and a focus on enhancing manufacturing yields, ACM Research positions itself as a key enabler of next-generation semiconductor production.

Foolish take

Seldon Capital's purchase of ACM Research stock is noteworthy because it's a new position, and it was of substantial size, bringing ACM shares to 2.7% of AUM. This suggests Seldon Capital holds a bullish outlook towards the company.

The buy in the third quarter was prescient as ACM Research shares hit a 52-week high of $45.12 in October. The rise in stock price is understandable given ACM's excellent business performance.

In Q3, sales rose a strong 32% year over year to $269.2 million. The company expects full-year revenue to come in between $875 million and $925 million. This represents excellent growth over 2024's $782.1 million.

ACM Research's diluted earnings per share (EPS) is also rising year over year. Through the first three quarters of 2025, its diluted EPS was $1.26 compared to $1.07 in 2024.

With its outstanding performance, ACM Research looks like a solid investment in the hot semiconductor industry.

Glossary

New position: When an investor or fund buys shares of a company for the first time.
Assets under management (AUM): The total market value of investments managed by a fund or financial institution.
13F: A quarterly SEC filing required from institutional investment managers to disclose their equity holdings.
Reportable assets: Investments that must be disclosed in regulatory filings, such as those included in a 13F report.
Total return: The investment's price change plus all dividends and distributions, assuming those payouts are reinvested.
Outperformed: Achieved a higher return than a specified benchmark or index over a given period.
Market close: The end of the regular trading session for a stock exchange on a given day.
Proprietary equipment: Technology or products owned and developed by a specific company, not available to competitors.
Integrated circuit manufacturers: Companies that design and produce semiconductor chips used in electronic devices.
Single-wafer wet cleaning equipment: Machines that clean individual semiconductor wafers using liquid chemicals during chip manufacturing.
Space alternated phase shift: A specialized technology used to improve semiconductor wafer processing efficiency and precision.
TTM: The 12-month period ending with the most recent quarterly report.

Robert Izquierdo has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Celestica and Vanguard Total Stock Market ETF. The Motley Fool has a disclosure policy.