Amentum (AMTM) Stock: Why It Moved Today
Updated Oct 19, 2026, 4:00 PM ET · closing price
- Closed at $19.48, -0.20% vs the prior close of $19.52.
- Volume 1.22M shares, 0.6x its 50-day average (light).
- No new SEC filings since the prior session.
- No new insider buys or sales reported since the prior session.
AMTM ends flat (-0.2%) to $19.48. Closed at $19.48, -0.20% vs the prior close of $19.52. Day range $19.27–$19.60, opened at $19.43.
AMTM daily analysis — what happened
A plain-English, data-only note for every US trading day (today's note updates every 2 hours while the market is open). Newest first; older days stay archived below.
Oct 19, 2026 — AMTM ends flat (-0.2%) to $19.48
- Closed at $19.48, -0.20% vs the prior close of $19.52. Day range $19.27–$19.60, opened at $19.43.
- Volume was 1.22M shares, 0.6x its 50-day average of 2.11M — lighter than usual.
- Price is -2.0% vs its 50-day average ($19.87) and -22.0% vs its 200-day average ($24.99).
- 52-week range $17.72–$38.11; today's close sits at 9% of that range, 48.9% below the 52-week high.
Oct 16, 2026 — AMTM rises 2.3% to $19.52
- Closed at $19.52, +2.25% vs the prior close of $19.09. Day range $18.97–$19.59, opened at $19.16.
- Volume was 2.09M shares, 1.0x its 50-day average of 2.11M.
- Price is -2.3% vs its 50-day average ($19.98) and -22.0% vs its 200-day average ($25.04).
- 52-week range $17.72–$38.11; today's close sits at 9% of that range, 48.8% below the 52-week high.
Oct 15, 2026 — AMTM jumps 5.3% to $19.09
- Closed at $19.09, +5.30% vs the prior close of $18.13. Day range $18.23–$19.14, opened at $18.23.
- Volume was 1.48M shares, 0.7x its 50-day average of 2.10M.
- Price is -4.8% vs its 50-day average ($20.06) and -23.9% vs its 200-day average ($25.09).
- 52-week range $17.72–$38.11; today's close sits at 7% of that range, 49.9% below the 52-week high.
Oct 14, 2026 — AMTM dips 2.1% to $18.13, 3 down days in a row
- Closed at $18.13, -2.11% vs the prior close of $18.52. Day range $18.00–$18.67, opened at $18.33.
- Volume was 1.07M shares, 0.5x its 50-day average of 2.11M — lighter than usual.
- Price is -10.0% vs its 50-day average ($20.15) and -27.9% vs its 200-day average ($25.14).
- 52-week range $17.72–$38.11; today's close sits at 2% of that range, 52.4% below the 52-week high.
- That makes 3 straight losses.
Oct 13, 2026 — AMTM dips 2.1% to $18.52
- Closed at $18.52, -2.11% vs the prior close of $18.92. Day range $18.47–$18.97, opened at $18.97.
- Volume was 1.22M shares, 0.6x its 50-day average of 2.11M — lighter than usual.
- Price is -8.6% vs its 50-day average ($20.27) and -26.5% vs its 200-day average ($25.19).
- 52-week range $17.72–$38.11; today's close sits at 4% of that range, 51.4% below the 52-week high.
Oct 12, 2026 — AMTM dips 1.9% to $18.92
- Closed at $18.92, -1.92% vs the prior close of $19.29. Day range $18.91–$19.47, opened at $19.40.
- Volume was 1.61M shares, 0.8x its 50-day average of 2.11M.
- Price is -7.1% vs its 50-day average ($20.36) and -25.1% vs its 200-day average ($25.25).
- 52-week range $17.72–$38.11; today's close sits at 6% of that range, 50.4% below the 52-week high.
Oct 9, 2026 — AMTM rises 1.7% to $19.29
- Closed at $19.29, +1.69% vs the prior close of $18.97. Day range $18.96–$19.40, opened at $19.06.
- Volume was 1.27M shares, 0.6x its 50-day average of 2.11M.
- Price is -5.6% vs its 50-day average ($20.43) and -23.8% vs its 200-day average ($25.30).
- 52-week range $17.72–$38.11; today's close sits at 8% of that range, 49.4% below the 52-week high.
Oct 8, 2026 — AMTM rises 2.5% to $18.97
- Closed at $18.97, +2.49% vs the prior close of $18.51. Day range $18.10–$18.97, opened at $18.37.
- Volume was 3.41M shares, 1.6x its 50-day average of 2.10M.
- Price is -7.4% vs its 50-day average ($20.48) and -25.2% vs its 200-day average ($25.36).
- 52-week range $17.72–$38.11; today's close sits at 6% of that range, 50.2% below the 52-week high.
Oct 7, 2026 — AMTM dips 1.4% to $18.51
- Closed at $18.51, -1.39% vs the prior close of $18.77. Day range $18.09–$18.70, opened at $18.59.
- Volume was 1.78M shares, 0.8x its 50-day average of 2.09M.
- Price is -9.9% vs its 50-day average ($20.53) and -27.1% vs its 200-day average ($25.41).
- 52-week range $17.72–$38.11; today's close sits at 4% of that range, 51.4% below the 52-week high.
Oct 6, 2026 — AMTM rises 2.9% to $18.77
- Closed at $18.77, +2.91% vs the prior close of $18.24. Day range $18.31–$18.93, opened at $18.41.
- Volume was 1.89M shares, 0.9x its 50-day average of 2.09M.
- Price is -9.0% vs its 50-day average ($20.63) and -26.3% vs its 200-day average ($25.46).
- 52-week range $17.72–$38.11; today's close sits at 5% of that range, 50.7% below the 52-week high.
Oct 5, 2026 — AMTM rises 0.6% to $18.24
- Closed at $18.24, +0.55% vs the prior close of $18.14. Day range $18.02–$18.63, opened at $18.12.
- Volume was 2.00M shares, 1.0x its 50-day average of 2.09M.
- Price is -11.9% vs its 50-day average ($20.71) and -28.5% vs its 200-day average ($25.51).
- 52-week range $17.72–$38.11; today's close sits at 3% of that range, 52.1% below the 52-week high.
Oct 2, 2026 — AMTM dips 1.8% to $18.14
- Closed at $18.14, -1.84% vs the prior close of $18.48. Day range $17.72–$18.59, opened at $18.59.
- Volume was 2.31M shares, 1.1x its 50-day average of 2.09M.
- Price is -12.8% vs its 50-day average ($20.80) and -29.0% vs its 200-day average ($25.56).
- 52-week range $17.72–$38.11; today's close sits at 2% of that range, 52.4% below the 52-week high.
- SEC filings that day: 8-K.
AMTM bull case vs bear case (from the data)
- Annual revenue grew 71.6% in the latest fiscal year (SEC XBRL).
- Latest fiscal-year net income: profit of $66.00M.
- Price is -2.0% vs its 50-day average — short-term trend is down.
- Price is -22.0% vs its 200-day average — below the long-term trend line.
AMTM latest news & SEC filings
Every SEC filing by or about AMTM in the last 120 days, explained in plain English. Updated daily, with a same-day refresh for new filings.
Oct 2, 2026 · Form 8-K — Major event / current report
Current report — a filing companies must make within 4 business days of a major event
- Item 5.02 — Change in directors or officers (appointment, departure or pay).
Sep 17, 2026 · Form 4 — Insider trade
Insider trade report (Form 4) — a director, officer or 10%+ owner changed their holdings
- Thompson Christopher M.T. gifted 4,250 shares on Aug 14, 2026; now holds 5,750
Open-market purchases (P) and sales (S) are shown in colour; awards, exercises and tax withholding are routine pay-related moves. Many sales are pre-planned under 10b5-1 plans.
Aug 11, 2026 · Form 10-Q — Quarterly report
Quarterly report (unaudited financial statements for the quarter)
Quarter ended Jul 3, 2026:
- Revenue: $3.49B (prior year $3.56B) (-2.0% vs Jun 27, 2025)
- Net income: $66.00M (prior year $10.00M) (+560.0% vs Jun 27, 2025)
- Diluted EPS: $0.27 (prior year $0.04) (+575.0% vs Jun 27, 2025)
Aug 10, 2026 · Form 8-K — Major event / current report
Current report — a filing companies must make within 4 business days of a major event
- Item 2.02 — Reported results of operations (earnings release).
This is a results-day filing: the earnings press release is attached as an exhibit.
Aug 6, 2026 · Form SCHEDULE 13G — Passive stake (13G)
Passive stake (13G) — an investor reported owning more than 5%
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Things to know before you trade AMTM
- Last results release: Aug 10, 2026 (8-K Item 2.02). Previous ones: May 11, 2026, Feb 9, 2026, Nov 24, 2025. Based on that rhythm, the next report is likely around Nov 9, 2026 — an estimate, not a confirmed date.
- How much it moves: over the last 20 sessions the average daily move was 1.80% (largest 5.3%).
- Liquidity: about 1.73M shares (≈$33.78M) trade per day on average.
- 52-week position: $19.48 vs a range of $17.72–$38.11 (9% of the range).
- Dividends: no cash dividends in the last 2 years.
- Splits: none in the last 2 years.
- Insider trades (Form 4, last 12 months, recent 25 shown): 0 open-market buys, 0 sales.
- Latest filings: 8-K Oct 2, 2026; 10-Q Aug 11, 2026; 8-K Aug 10, 2026.
- Share count: 244.51M shares outstanding (Aug 7, 2026), +0.5% vs a year earlier.
- Listing: NYSE · industry: Services-Business Services, NEC.
AMTM market data (last 20 sessions)
| Date | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|
| Oct 19, 2026 | 19.43 | 19.60 | 19.27 | 19.48 | 1.22M |
| Oct 16, 2026 | 19.16 | 19.59 | 18.97 | 19.52 | 2.09M |
| Oct 15, 2026 | 18.23 | 19.14 | 18.23 | 19.09 | 1.48M |
| Oct 14, 2026 | 18.33 | 18.67 | 18.00 | 18.13 | 1.07M |
| Oct 13, 2026 | 18.97 | 18.97 | 18.47 | 18.52 | 1.22M |
| Oct 12, 2026 | 19.40 | 19.47 | 18.91 | 18.92 | 1.61M |
| Oct 9, 2026 | 19.06 | 19.40 | 18.96 | 19.29 | 1.27M |
| Oct 8, 2026 | 18.37 | 18.97 | 18.10 | 18.97 | 3.41M |
| Oct 7, 2026 | 18.59 | 18.70 | 18.09 | 18.51 | 1.78M |
| Oct 6, 2026 | 18.41 | 18.93 | 18.31 | 18.77 | 1.89M |
| Oct 5, 2026 | 18.12 | 18.63 | 18.02 | 18.24 | 2.00M |
| Oct 2, 2026 | 18.59 | 18.59 | 17.72 | 18.14 | 2.31M |
| Oct 1, 2026 | 18.22 | 18.75 | 18.08 | 18.48 | 1.72M |
| Sep 30, 2026 | 18.24 | 18.41 | 18.06 | 18.12 | 1.63M |
| Sep 29, 2026 | 18.48 | 18.58 | 17.89 | 18.15 | 2.95M |
| Sep 28, 2026 | 19.00 | 19.04 | 18.48 | 18.49 | 1.19M |
| Sep 25, 2026 | 19.35 | 19.37 | 19.01 | 19.19 | 1.51M |
| Sep 24, 2026 | 19.64 | 19.81 | 19.39 | 19.40 | 986.00K |
| Sep 23, 2026 | 19.92 | 20.06 | 19.64 | 19.71 | 1.20M |
| Sep 22, 2026 | 20.00 | 20.11 | 19.41 | 19.70 | 2.13M |
About Amentum
Amentum (AMTM) is listed on the NYSE and classified by the SEC under “Services-Business Services, NEC”. Its business address is in CHANTILLY, VA. State of incorporation: DE. Fiscal year ends October 2. SEC CIK 2011286.
AMTM board of directors & executives
From SEC Form 3/4/5 insider filings made in the last 12 months (date = latest filing).
Directors
| Name | Role | Latest filing |
|---|---|---|
| Vincent K Brooks | Director | Feb 10, 2026 |
| Steven J. Demetriou | Executive Chair | Feb 10, 2026 |
| Ralph E Eberhart | Director | Feb 10, 2026 |
| John E. Heller | Chief Executive Officer | May 7, 2026 |
| Susan Leslie Ireland | Director | Feb 10, 2026 |
| Barbara Loughran | Director | Feb 10, 2026 |
| Sandra E. Rowland | Director | Feb 10, 2026 |
| Christopher M.T. Thompson | Director | Sep 17, 2026 |
| John C. Vollmer | Director | Feb 10, 2026 |
Executive officers
| Name | Title | Latest filing |
|---|---|---|
| Stephen A Arnette | Chief Operating Officer | May 7, 2026 |
| Jill L Bruning | Chief Technology Officer | May 7, 2026 |
| Darren Burton | Chief People Officer | Dec 9, 2025 |
| Steven J. Demetriou | Executive Chair | Feb 10, 2026 |
| John E. Heller | Chief Executive Officer | May 7, 2026 |
| Travis Barton Johnson | Chief Financial Officer | May 7, 2026 |
| Sean Thomas Mullen | Chief Growth Officer | May 7, 2026 |
| Mary Michele T St. | Chief Legal Officer & GC | Feb 18, 2026 |
Recent insider buys & sales
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| No open-market insider buys or sales reported in the last 12 months. | ||||
AMTM financials (annual, from XBRL filings)
| Fiscal year end | Revenue | Net income | Diluted EPS | Operating cash flow |
|---|---|---|---|---|
| Oct 3, 2025 | $14.39B | $66.00M | 0.27 | $543.00M |
| Sep 27, 2024 | $8.39B | $-82.00M | -0.90 | $47.00M |
| Sep 29, 2023 | $7.87B | $-314.00M | -3.49 | $67.00M |
| Sep 30, 2022 | $7.68B | $-84.00M | -0.93 | $126.00M |
Latest balance sheet: total assets $11.20B, total liabilities $6.41B, cash $459.00M (as of Jul 3, 2026).
AMTM earnings / results-day log
| Date | Filing | Close that day |
|---|---|---|
| Aug 10, 2026 | 8-K Item 2.02 (results) | $24.44 |
| May 11, 2026 | 8-K Item 2.02 (results) | $23.94 |
| Feb 9, 2026 | 8-K Item 2.02 (results) | $36.59 |
| Nov 24, 2025 | 8-K Item 2.02 (results) | $25.37 |
| Aug 5, 2025 | 8-K Item 2.02 (results) | $25.31 |
| May 6, 2025 | 8-K Item 2.02 (results) | $22.11 |
| Feb 4, 2025 | 8-K Item 2.02 (results) | $20.50 |
| Dec 16, 2024 | 8-K Item 2.02 (results) | $23.78 |
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Information only, not investment advice. BuyMeWhiskey is not a registered investment adviser or broker-dealer; nothing here is a recommendation to buy, sell or hold any security, and there are no price targets. Data comes from SEC EDGAR filings and public end-of-day market data and may be delayed or contain errors. Verify with the company's filings before making decisions. Prices: end-of-day data as of Oct 19, 2026, 4:00 PM ET. Filings: SEC EDGAR. Refreshed every 2 hours during US market hours.