Offerings // ACM Research, Inc.

ACMR offering history

Every offering-related filing in ACM Research, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 615 filings back to Aug 16, 2016.

Last executed offering

May 12, 2026

424B5 — priced deal (shares or notes)

Last registration (announced)

Mar 18, 2024

S-3ASR — capacity, not a sale

Executed, last 12 months

424B pricings + 8-K 3.02 sales

Registered, last 12 months

S-1/S-3/F-series registrations

Date	Filing		What it means
May 12, 2026	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Mar 18, 2024	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Aug 11, 2020	RW →	WITHDRAWN	Registration withdrawn
May 26, 2020	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Aug 15, 2019	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Aug 13, 2019	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 12, 2019	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 27, 2018	S-3/A →	REGISTERED	S-3/A registration — capacity to sell shares, not a sale yet
Dec 10, 2018	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Nov 3, 2017	424B4 →	EXECUTED	Final prospectus — offering priced (typical for IPOs and marketed share deals)
Nov 2, 2017	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Nov 2, 2017	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Oct 30, 2017	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Oct 25, 2017	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Oct 18, 2017	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Sep 13, 2017	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet

ACMR offering-related filings from SEC EDGAR, newest first (capped at 40). Each links to the original document.

Two honest limits. (1) A 424B takedown can price shares or notes— EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.

Is a shelf active now? →Do they need money? →Red flags →Full ACMR workspace →

ACMR offering FAQ

When did ACMR last execute an offering?

Per SEC filings, ACM Research, Inc.'s most recent priced offering document is a 424B5 filed 2026-05-12. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did ACMR last announce or register an offering?

The most recent registration is a S-3ASR filed 2024-03-18. A registration is capacity to sell shares — not a sale.

Does an offering always mean dilution?

Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.