Amentum Holdings, Inc.
Amentum Holdings, Inc. (AMTM) Shares Outstanding — Overview
Basic and diluted weighted average shares, YoY change, float context, and historical trend from SEC filings and FMP.
AMTM · shares outstanding · updated Jun 8, 2026
Key metrics
as of Oct 3, 2025Shares Outstanding Growth Rate
CAGR · weighted avg basic sharesNegative CAGR typically indicates share buyback or retirement activity. Interpret alongside Splits and Financials tabs. Splits / Financials
Shares outstanding history
Annual shares outstanding by year
Industrials sector shares outstanding comparison
Shares Outstanding for similar companies or competitors in the Industrials sector.
RTX
GE
BA
UNP
CAT
DEAMTM/company-screener · per-peer /income-statement · cache 86400s
Understanding Shares Outstanding
Basic · Diluted · FloatWhat Are Shares Outstanding? (Basic)
Amentum Holdings, Inc. (AMTM) shares outstanding is the total number of issued shares held by shareholders — the basis for Basic EPS and market capitalization. As of October 3, 2025, Amentum Holdings, Inc. reports 243.0M basic shares outstanding (weighted average).
Basic vs. Diluted Shares Outstanding
Amentum Holdings, Inc.'s basic shares outstanding (243.0M) represents currently issued shares. Diluted shares outstanding (244.0M) also includes potential shares from stock options, RSUs, and convertibles. Dilution spread: +0.41%.
Shares Outstanding vs. Float (Free Float)
Amentum Holdings, Inc.'s float is 196.8M (80.6% of total shares outstanding) — shares freely available for public trading, excluding insider-held and restricted shares.
ⓘ Float data from /shares-float reflects the most recent SEC filing period-end. The weighted average shares (from /income-statement) may differ — this is a normal reporting window difference, not a data error.
FMP /income-statement · /shares-float · SEC EDGAR · USD
About shares outstanding & methodology
Amentum Holdings, Inc. (AMTM) shares outstanding history from 2021 to 2025. Shares outstanding can be defined as the total number of shares held by all shareholders — including institutional investors, retail investors, and company insiders — assuming conversion of all convertible debt, securities, warrants, and options. This metric excludes the company's treasury shares.
Amentum Holdings, Inc. shares outstanding for the fiscal year ending October 3, 2025 were 243.0M, a 167.03% increase year-over-year. Amentum Holdings, Inc. FY 2025 shares outstanding were 243.0M, a +167.03% increase from FY 2024.
Amentum Holdings, Inc. is a leading company operating in the Industrials sector. The company's share count trajectory — with a 10-year CAGR of — — is a key signal for investors evaluating capital return policy, EPS accretion, and long-term shareholder value creation.
Frequently asked questions
AMTM shares outstanding · 4 questionsAs of October 3, 2025, Amentum Holdings, Inc. (AMTM) has approximately 243.0M basic shares outstanding and 244.0M diluted shares outstanding. This represents a +167.03% year-over-year increase from FY 2024 (91.0M). The increase may reflect equity compensation issuances or secondary offerings.
▸ Data: FMP /income-statement · /shares-float · SEC EDGAR · weighted average basis · Amentum Holdings, Inc. SEC 10-K & 10-Q filings · US GAAP · Last updated: 2026-06-08