Amentum Holdings, Inc AMTM

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Amentum Holdings, Inc. Common Stock · Company · NYSE · Industrials / Specialty Business Services

Paper trade (simulated — no real money)

Fill: USD 20.0600 · FX 1 USD = 1.266600 SGD · about SGD 25.4080 per unit

Sign in to place simulated trades. USD fills are converted into the SGD portfolio at the displayed rate.

Announcement types: (default: consequential filings)
Results & current reports
Capital markets
Ownership & governance

USD closing-price chart (daily close from yfinance · Last year)

USD 24.24 → 20.06 · -17.2%
37.53028.71519.900 1 2 3 4,5 6 7,8 9 10 11 12 13 Sep 25Dec 25Mar 26Jun 26Sep 26

Numbered dotted lines mark the filtered filings under Announcement Events below.

Price & SEC Filing History 05 Sep 2025 — 06 Sep 2026 (Last year)

Daily NYSE prices are sourced from yfinance. Yellow highlighting marks an intraday rise or a gap up between adjacent trading sessions. SEC acceptance times are converted to US Eastern time: pre-market filings appear below that day’s OHLCV row; filings accepted after the 09:30 ET open appear above it. The SEC does not publish an exact first-public-availability timestamp, so acceptance time is the best available proxy.

Weekend
Weekend
20.0000 20.2350 19.8850 20.0600 1,076,543
20.0000 20.3500 19.9000 20.1100 1,479,000
19.8900 20.1900 19.8000 19.9000 1,939,000
20.1300 20.2500 19.8000 19.9900 1,837,200
20.2400 20.4900 19.9000 19.9900 1,367,900
Weekend
Weekend
20.4500 20.5730 20.1700 20.3100 1,230,600
20.6300 20.6800 20.4000 20.4300 1,588,200
20.1400 20.8500 20.1400 20.6100 1,779,100
20.2000 20.3380 19.9700 20.2600 2,719,500
21.4700 21.6530 19.9920 20.0600 2,601,000
Weekend
Weekend
20.7800 21.5500 20.6400 21.4900 3,100,500
21.1000 21.1800 20.3750 20.6100 3,122,600
21.0000 21.6800 20.8000 21.0300 2,024,700
20.5500 20.9700 20.0900 20.9500 4,058,700
21.1700 21.2650 20.1850 20.4300 4,125,400
Weekend
Weekend
21.6900 21.9800 21.2500 21.4700 1,768,300
22.6600 22.9800 21.4400 21.6700 2,316,200
22.1500 22.6200 21.9000 22.5200 3,935,000
13 · 10-Q After-hours · 16:25 ET FORM 10-Q ↗
23.2000 23.5500 21.8610 22.4300 6,972,000
12 · 8-K After-hours · 16:42 ET FORM 8-K ↗
24.7700 25.0800 24.3900 24.4400 2,732,800
Weekend
Weekend
23.8500 24.8200 23.5300 24.7700 1,780,000
23.3500 24.3800 23.2990 23.8400 1,996,600
24.2600 24.2800 23.3200 23.4000 1,043,200
23.1200 24.1600 23.1200 24.1400 1,524,200
22.2400 23.2300 22.1950 23.1800 1,301,800
Weekend
Weekend
21.7300 22.3450 21.4850 22.2000 1,392,200
21.5000 21.8100 21.2600 21.7300 1,392,100
23.2800 23.3330 21.7200 21.8000 2,608,900
22.8000 23.4700 22.7500 23.4600 1,543,400
22.5800 23.0400 22.4900 22.8700 1,602,600
Weekend
Weekend
22.2500 23.1810 22.2500 22.5500 2,241,000
21.2600 22.3010 21.2500 22.0100 2,081,300
21.1700 21.6900 21.0200 21.4200 1,749,600
21.1400 21.2200 20.8240 20.9800 1,530,200
20.8500 21.6500 20.6750 21.1600 2,193,800
Weekend
Weekend
20.8000 21.2800 20.5000 20.6800 1,190,000
20.8900 21.0250 20.5100 20.7700 1,488,700
20.5500 21.3400 20.5500 20.7600 1,736,900
20.2500 21.0000 20.1450 20.4900 1,557,800
21.2100 21.2800 20.2100 20.4300 1,553,800
Weekend
Weekend
21.5000 21.8500 20.7600 21.0100 1,608,700
20.6100 21.3400 20.4500 21.3000 1,748,700
20.9500 21.0240 20.5900 20.8800 1,618,800
22.4000 22.7200 21.1500 21.1800 2,150,300
21.2600 22.2700 21.1400 22.2500 2,391,200
Weekend
Weekend
No trading
20.5100 21.2600 20.4600 21.2400 2,430,100
20.8700 21.2700 20.1900 20.2000 2,337,200
20.5000 21.2300 20.1650 20.6700 2,281,600
20.2950 20.5700 19.9900 20.2300 2,511,600
Weekend
Weekend
19.9100 20.3000 19.8020 20.2500 2,445,400
20.3100 20.5700 19.9500 20.0900 2,678,400
20.8800 21.0700 20.3400 20.3800 2,080,200
21.0000 21.2700 20.7700 20.9600 1,867,500
21.3600 21.4000 20.7740 21.0600 1,761,700
Weekend
Weekend
No trading
21.4000 21.6700 20.9900 21.6600 3,296,500
22.1800 22.6000 21.3800 21.5000 1,986,000
22.4000 22.5650 21.9400 22.1600 1,584,100
23.2600 23.4540 22.2000 22.4200 1,612,100
Weekend
Weekend
22.3100 22.9800 21.8900 22.8600 1,080,400
21.9000 22.2200 21.7400 22.0800 2,221,300
22.4600 22.5500 21.8700 22.0000 963,700
22.7000 23.0000 21.8700 22.5100 1,576,400
22.6800 23.1500 22.4100 22.6100 2,609,800
Weekend
Weekend
23.2500 23.3100 22.5400 22.8000 1,629,600
23.6100 24.1000 23.1200 23.2900 1,441,200
23.0000 23.2750 22.6700 23.1500 1,823,300
23.6100 23.8300 22.9600 23.3600 1,788,500
23.6100 24.5260 23.5100 24.0700 1,931,700
Weekend
Weekend
23.8100 23.8300 22.9400 23.2300 2,901,800
23.1000 24.2200 22.8800 23.8400 2,097,800
22.9500 23.2000 22.6650 23.1100 2,003,800
23.2300 23.4600 22.7450 22.9100 2,750,200
No trading
Weekend
Weekend
23.3000 23.7200 22.9700 23.2300 1,466,300
22.2200 23.2200 22.0500 23.1600 2,069,700
22.6600 22.7100 22.1100 22.5000 2,111,800
23.3500 23.5000 22.6300 22.6300 2,489,500
22.9400 23.4800 22.6400 23.2900 1,868,500
Weekend
Weekend
23.3100 23.3100 22.6100 22.9800 1,945,000
23.2700 23.5400 22.9450 23.2500 2,227,300
24.5500 24.6000 22.6000 23.1500 3,975,100
11 · 10-Q After-hours · 16:37 ET FORM 10-Q ↗
25.5200 25.5300 23.8300 24.3100 4,175,000
10 · 8-K After-hours · 17:05 ET FORM 8-K ↗
24.5300 25.2400 23.8500 23.9400 5,092,400
Weekend
Weekend
24.6000 24.7950 23.9300 24.5300 2,029,500
25.0600 25.3320 24.3850 24.5600 1,310,000
24.5000 25.0100 23.7500 24.8900 1,645,800
25.9100 25.9900 24.0100 24.3200 2,748,300
25.6200 26.3800 25.5200 25.7600 1,454,500
Weekend
Weekend
26.4300 26.6700 25.4800 25.6500 2,066,700
25.4400 26.2900 25.4000 26.2300 1,453,000
25.9200 26.0400 25.1300 25.3400 1,501,000
26.4100 26.7000 25.6100 25.9000 1,063,600
9 · 8-K Pre-market · 08:01 ET FORM 8-K ↗
25.9000 26.6700 25.8800 26.1400 1,617,800
Weekend
Weekend
27.0000 27.0000 25.6900 25.8500 1,967,700
27.6600 27.9050 26.6020 26.8700 1,658,500
28.0700 28.5400 27.6400 27.7900 1,574,700
27.6100 28.1400 27.3200 27.6500 1,787,000
27.4800 27.9300 27.0190 27.6300 1,682,700
Weekend
Weekend
27.8300 28.1500 26.9300 27.5800 1,838,100
27.7500 28.2200 27.2500 27.5000 1,640,500
27.5900 28.1000 27.3500 27.5800 1,155,700
27.6500 27.9800 27.2600 27.4800 1,001,400
26.3800 27.7100 26.2150 27.5700 2,246,000
Weekend
Weekend
26.6300 26.8000 25.8900 26.2900 1,119,200
27.1300 27.3600 26.5200 26.5300 1,138,200
27.3000 27.6400 27.0650 27.1500 2,880,600
26.9500 27.3080 26.5600 26.6700 1,903,000
27.1700 27.4500 26.8500 27.0600 1,022,000
Weekend
Weekend
No trading
26.0900 27.4200 26.0000 27.0400 1,392,500
26.5600 26.7400 26.1600 26.3400 2,937,900
25.8700 26.4900 25.3800 26.0800 3,113,500
26.0400 26.1300 24.8900 25.1700 1,419,200
Weekend
Weekend
26.4000 26.4000 25.5850 25.8400 1,156,000
26.4500 26.9200 26.2400 26.5400 968,100
26.9600 27.1000 26.3050 26.7400 1,055,300
26.4800 26.8400 26.1400 26.5900 1,704,000
27.0000 27.4600 26.6800 26.7400 2,030,600
Weekend
Weekend
27.0600 27.1900 26.6300 26.8000 3,637,400
26.9100 27.4500 26.5600 27.2000 1,671,700
27.5000 27.9000 27.0500 27.0700 1,650,800
27.6600 28.3100 27.6000 27.6500 1,278,000
28.0800 28.4900 27.3900 27.4300 1,968,200
Weekend
Weekend
28.1100 28.5000 27.3300 27.9000 1,720,300
27.8700 28.3300 27.6400 28.0000 2,038,400
28.8000 28.8000 27.9000 27.9900 2,048,900
30.5500 30.5500 28.4800 28.7900 2,241,200
29.6900 30.8500 29.0200 30.3000 1,530,000
Weekend
Weekend
30.0700 30.0900 29.1600 30.0100 2,248,400
30.6300 31.2000 29.6400 30.5700 2,850,900
30.3100 31.3700 30.1900 31.1900 2,124,200
29.8100 30.7200 29.3600 30.6600 1,363,600
29.7300 31.1000 29.7100 30.7000 1,725,000
Weekend
Weekend
29.9200 30.3600 29.5100 29.8700 1,678,400
29.5900 30.3170 29.3000 30.2300 1,210,100
30.4800 30.6800 29.3100 29.5300 1,836,600
29.5000 30.2700 29.1600 30.1900 2,776,400
30.8400 30.8400 29.4800 29.5500 1,771,800
Weekend
Weekend
31.9800 32.2400 30.8800 30.9700 1,802,400
30.5000 32.0300 30.2500 32.0200 1,563,300
30.2000 31.0600 30.0500 30.8700 1,487,700
30.7200 30.9500 30.0000 30.0500 1,814,300
No trading
Weekend
Weekend
30.2000 31.4100 29.6820 31.0000 3,400,200
30.3200 30.9950 29.3500 30.0700 3,311,800
32.1200 32.2400 30.2000 30.3900 3,600,200
8 · 8-K After market open · 09:41 ET FORM 8-K ↗
33.6400 33.7500 31.1500 32.0600 6,815,200
7 · 10-Q Pre-market · 09:20 ET FORM 10-Q ↗ 6 · 8-K After-hours · 16:37 ET FORM 8-K ↗
37.6000 37.8970 36.5200 36.5900 3,519,200
Weekend
Weekend
36.3300 38.1100 36.2150 37.5300 4,578,800
35.7500 37.2800 35.6040 36.4000 2,253,100
36.5900 37.0000 35.4200 36.4500 2,178,200
36.9100 36.9700 35.1900 36.2100 1,959,100
35.8300 36.5250 35.0400 35.8900 2,528,200
Weekend
Weekend
36.7500 37.4150 35.1700 35.7800 2,291,900
37.5100 37.9400 35.8400 37.1200 2,936,500
35.3400 35.9800 34.9300 35.7100 1,492,300
34.9400 35.6600 34.7000 35.3700 1,452,500
35.5100 35.7290 34.3800 34.8900 1,700,800
Weekend
Weekend
35.8300 36.0000 35.0700 35.3800 1,184,800
35.0000 35.8700 34.7900 35.5600 1,405,800
34.5500 35.1700 34.0000 34.6700 1,529,100
34.4800 35.0000 34.1900 34.3900 1,844,600
No trading
Weekend
Weekend
34.5700 35.0000 34.4100 34.8000 2,347,400
34.8500 34.9400 34.3700 34.5800 1,489,400
34.5000 34.9300 34.0700 34.6000 1,586,100
34.4000 34.5000 33.9910 34.3000 1,466,300
33.9000 34.6400 33.5200 34.4000 1,914,700
Weekend
Weekend
32.5900 33.7800 32.5900 33.6300 2,434,500
31.5500 32.8500 31.3520 32.4700 2,637,000
31.7000 31.9400 30.9600 31.1900 1,312,100
31.4100 31.6800 31.0500 31.5300 2,328,900
30.8000 31.7300 30.8000 31.4400 2,318,100
Weekend
Weekend
29.1000 30.7000 28.9300 30.4800 2,351,600
No trading
29.2400 29.2440 28.7800 29.0000 1,444,100
29.4600 29.6500 28.8900 29.3000 1,242,600
29.5800 29.8300 29.1600 29.2000 1,067,500
Weekend
Weekend
30.0400 30.0800 29.5300 29.7300 843,900
No trading
29.6300 30.0000 29.3700 29.9100 854,100
29.6200 29.7200 29.1500 29.4600 1,020,900
29.3400 30.2130 29.2600 29.8700 1,726,000
Weekend
Weekend
5 · DEFA14A After-hours · 16:09 ET DEFA14A ↗ 4 · DEF 14A After-hours · 16:05 ET FORM DEF 14A ↗
28.6350 29.5320 28.4000 29.2100 2,308,100
28.9000 29.1770 28.6300 28.6900 1,431,500
28.9400 29.4400 28.5300 28.6700 2,845,100
28.7900 29.1700 28.1400 29.1300 2,299,500
29.6300 29.9200 28.8000 29.3500 1,957,300
Weekend
Weekend
29.7100 29.9900 29.2000 29.7200 2,644,500
29.6700 30.1800 28.9000 30.1300 2,777,500
28.7000 29.6100 28.5000 29.6000 2,460,000
28.4300 29.3200 28.0100 28.8400 2,576,700
28.7500 29.0000 28.3300 28.8200 2,245,000
Weekend
Weekend
28.8700 28.9100 28.1900 28.8800 2,885,900
28.8700 29.6840 28.4500 29.2500 3,924,400
28.7900 28.9600 28.2700 28.5600 2,451,800
28.8400 28.8900 28.3000 28.7200 2,218,400
28.5500 29.0500 28.1700 28.2100 1,967,000
Weekend
Weekend
29.2600 29.4000 28.6200 28.6300 1,370,800
No trading
30.5700 30.9700 29.1100 29.3300 4,045,700
3 · 10-K After-hours · 16:29 ET FORM 10-K ↗
28.3500 31.8710 27.5600 30.0000 10,550,000
2 · 8-K After-hours · 16:41 ET FORM 8-K ↗
24.6500 25.4500 24.0420 25.3700 2,982,700
Weekend
Weekend
24.3800 25.0300 23.1300 24.2600 3,225,400
25.5500 26.2000 24.0200 24.3800 4,207,500
21.7500 25.8900 21.5150 25.5200 10,203,200
21.2000 22.1400 21.1100 21.7900 1,639,800
21.8700 22.0300 21.3300 21.4900 1,533,800
Weekend
Weekend
21.6100 22.2800 21.5500 22.0700 890,600
22.8900 23.1900 22.0700 22.1600 1,525,000
23.4700 24.0800 22.9400 22.9600 2,221,600
22.8100 23.0900 22.6200 22.9600 767,600
23.1500 23.3130 22.1500 22.8100 1,854,200
Weekend
Weekend
21.5900 22.4700 21.4700 22.4100 1,153,100
22.2000 22.4200 21.7800 21.7900 1,233,900
21.8100 22.5350 21.7800 22.2400 695,300
21.8000 22.3100 21.6650 21.9500 1,024,900
22.2300 22.3500 21.5000 22.2000 1,234,500
Weekend
Weekend
22.2200 22.4200 21.8800 22.4100 1,550,900
21.3100 22.1800 21.2830 21.9000 1,561,500
21.7800 22.0800 21.4000 21.4800 1,683,200
22.4100 22.5000 21.7700 21.8800 1,317,100
22.5800 22.9700 22.2600 22.4600 1,814,600
Weekend
Weekend
23.2400 23.4000 22.4300 22.5500 1,329,500
22.5200 23.2400 22.4400 23.1600 994,200
22.6800 23.0300 22.2800 22.3400 877,500
22.8000 23.3400 22.7700 22.8500 810,700
22.6400 23.0800 22.2400 22.8800 766,900
Weekend
Weekend
22.3300 22.6000 22.1750 22.4000 995,800
23.2600 23.4040 22.5900 22.6700 902,700
23.5600 24.0900 22.7900 23.0500 1,375,100
23.6200 23.8300 23.0800 23.4500 995,900
23.6700 23.9800 23.3650 23.6900 1,143,700
Weekend
Weekend
23.9200 23.9850 23.3200 23.3900 1,370,600
25.1700 25.1700 23.8700 23.9000 1,316,700
25.3800 25.5100 24.9900 25.2500 1,418,700
26.3900 26.5000 25.1750 25.2500 1,904,600
26.0000 26.5800 25.8450 26.2700 3,511,600
Weekend
Weekend
25.3500 26.3500 25.2650 25.9500 3,006,500
25.0200 25.2800 24.0000 25.1500 2,401,900
1 · S-3ASR After-hours · 16:29 ET S-3ASR ↗
23.6100 25.2350 23.5550 25.1600 1,894,500
22.7600 23.9600 22.6800 23.9500 2,751,100
22.7100 22.8800 22.5000 22.8200 1,363,900
Weekend
Weekend
22.3600 22.6350 22.1300 22.5700 877,500
23.2800 23.5200 22.0500 22.3600 1,480,500
22.6800 22.8700 22.5150 22.5900 1,314,200
22.9000 23.2900 22.4550 22.5600 1,895,800
22.3100 22.9300 21.9500 22.8100 1,933,500
Weekend
Weekend
22.4800 22.5600 22.0500 22.3500 3,112,200
22.2500 22.4400 21.7100 22.2700 2,891,500
22.7200 23.2000 22.0400 22.2400 2,493,800
23.0200 23.0250 22.6200 22.6500 2,115,500
23.7000 23.7000 22.6100 22.9500 2,377,800
Weekend
Weekend
23.7300 24.1400 23.6400 23.8500 991,400
23.7300 24.1500 23.6000 23.9500 1,247,900
23.6900 24.1300 23.6750 23.7700 1,227,400
23.9700 24.0300 23.6900 23.7100 1,247,500
24.2200 24.2570 23.8600 24.0900 1,894,900
Weekend
Weekend
24.4200 24.4350 23.8050 24.2400 1,251,100

Announcement Events

Each title opens the filing on the SEC website. Registered users can summarise the filing and up to seven relevant exhibits linked within the same SEC submission.

13 10-Q FORM 10-Q (opens SEC filing in a new tab) After-hours · 16:25 ET Summarise
12 8-K FORM 8-K (opens SEC filing in a new tab) After-hours · 16:42 ET Summarise
11 10-Q FORM 10-Q (opens SEC filing in a new tab) After-hours · 16:37 ET Summarise
10 8-K FORM 8-K (opens SEC filing in a new tab) After-hours · 17:05 ET Summarise
9 8-K FORM 8-K (opens SEC filing in a new tab) Pre-market · 08:01 ET Summarise
8 8-K FORM 8-K (opens SEC filing in a new tab) After market open · 09:41 ET Summarise
7 10-Q FORM 10-Q (opens SEC filing in a new tab) Pre-market · 09:20 ET Summarise
6 8-K FORM 8-K (opens SEC filing in a new tab) After-hours · 16:37 ET Summarise
5 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:09 ET Summarise
4 DEF 14A FORM DEF 14A (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
3 10-K FORM 10-K (opens SEC filing in a new tab) After-hours · 16:29 ET Summarise
2 8-K FORM 8-K (opens SEC filing in a new tab) After-hours · 16:41 ET Summarise
1 S-3ASR S-3ASR (opens SEC filing in a new tab) After-hours · 16:29 ET Summarise