Amphastar Pharmaceuticals, Inc AMPH

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Amphastar Pharmaceuticals, Inc. - Common Stock · Company · Nasdaq · Healthcare / Drug Manufacturers - Specialty & Generic

Paper trade (simulated — no real money)

Fill: USD 25.1400 · FX 1 USD = 1.277900 SGD · about SGD 32.1264 per unit

Sign in to practise with simulated trades before investing real money. 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 24.52 → 25.14 · 2.5%
29.40023.13516.870 1 2,3 4 5,6 7,8 9 10,11 12,13 14 15 16 17,18 Oct 25Jan 26Apr 26Jul 26Oct 26

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

Price & SEC Filing History 24 Oct 2025 — 25 Oct 2026 (Last year)

Daily Nasdaq 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
25.9100 25.9100 24.6250 25.1400 482,286
26.2500 26.5000 25.9200 26.0400 315,000
25.6900 26.3500 25.5100 26.2000 390,200
26.2400 26.6100 25.8200 25.9400 360,200
25.6300 26.3100 25.6300 26.1400 299,500
Weekend
Weekend
26.6100 26.6100 25.5200 25.8700 352,100
26.3800 27.1000 26.1300 26.4200 352,300
25.8900 26.5700 25.8900 26.0800 364,700
26.9100 27.0000 26.0300 26.0500 326,500
26.6200 26.8600 26.5100 26.7600 362,800
Weekend
Weekend
25.7300 26.7900 25.6500 26.6200 437,700
25.3900 26.1400 25.1000 25.8100 423,500
25.9100 26.1700 25.2900 25.5400 776,300
25.5400 26.1300 25.0300 25.9100 469,100
25.4300 25.7000 25.1700 25.3700 454,500
Weekend
Weekend
25.4600 25.5500 25.0600 25.4300 374,200
25.6000 26.0200 25.3000 25.3500 531,000
26.7300 26.7900 25.7700 25.8100 509,400
27.5900 27.6400 26.5200 26.6800 632,000
25.9900 27.8000 25.9600 27.3900 747,900
Weekend
Weekend
26.2500 26.6300 25.6600 26.1300 376,900
24.8100 26.3100 24.6500 26.2700 572,100
24.3900 25.1200 24.2000 24.9600 508,100
24.6000 24.8300 24.0000 24.3200 522,400
23.5400 25.4100 23.4500 24.4800 595,800
Weekend
Weekend
23.6900 23.9900 23.5100 23.6200 1,453,800
24.0800 24.1800 23.5000 23.8200 465,600
23.6400 24.3900 23.4900 23.9500 503,900
23.7500 23.9400 23.5600 23.6400 354,400
23.8400 24.2800 23.5600 23.9100 474,900
Weekend
Weekend
23.6500 23.8000 23.2400 23.7800 410,900
23.0000 23.6900 22.7600 23.5400 515,000
22.8400 23.0700 22.5700 23.0400 351,600
22.8200 23.1400 22.3000 22.9300 460,000
No trading
Weekend
Weekend
23.4700 23.7400 23.0700 23.1800 650,100
23.8800 23.9200 23.0400 23.8400 469,800
23.0500 23.8300 23.0300 23.7400 456,700
22.5900 23.0500 22.5900 22.9600 551,000
21.8600 22.6500 21.5200 22.5300 274,000
Weekend
Weekend
21.8800 22.1500 21.6900 22.0100 224,500
21.6900 21.9700 21.6300 21.8800 259,800
21.8600 22.4400 21.7200 22.0200 395,600
21.5000 22.0700 21.4100 21.9800 283,800
21.6000 21.8100 21.2600 21.5200 210,300
Weekend
Weekend
21.6400 22.2000 21.4400 21.6000 376,600
21.3800 21.7600 21.2400 21.6800 338,700
21.6400 21.9900 21.1500 21.7400 410,800
21.1100 21.5900 21.0800 21.3400 411,800
20.9000 21.2300 20.7700 20.8600 533,500
Weekend
Weekend
20.0200 21.0700 19.8900 20.9100 305,700
20.1800 20.2700 19.8400 20.1800 526,100
20.1600 20.2200 19.6100 19.9800 343,800
20.0000 20.5700 20.0000 20.4200 570,500
20.7400 20.9000 19.5500 20.3100 645,700
Weekend
Weekend
22.4800 22.6500 20.4000 20.7800 1,301,000
18 · 10-Q After-hours · 16:50 ET 10-Q ↗ 17 · 8-K After-hours · 16:32 ET 8-K ↗
20.2200 20.2500 19.6000 19.8100 527,300
20.0600 20.2800 19.8800 20.2400 351,600
20.1100 20.3800 19.8600 19.9000 481,600
20.1100 20.4600 19.7000 20.2200 413,200
Weekend
Weekend
20.3500 20.4100 19.6700 19.9400 367,600
20.3100 20.5300 19.9500 20.3800 355,700
20.2400 20.7000 19.9900 20.5800 321,700
19.3800 20.2700 19.3800 20.1500 390,800
18.9700 19.3100 18.9600 19.1800 285,900
Weekend
Weekend
18.9000 19.1200 18.5000 18.7200 445,700
19.0800 19.3400 18.7300 18.8700 650,400
19.7100 19.9500 19.2000 19.3000 409,200
19.4200 19.8900 19.4200 19.5900 621,100
19.7800 19.9100 19.5200 19.6300 437,400
Weekend
Weekend
19.8400 20.3500 19.6300 19.7500 338,500
19.4000 20.1400 19.4000 19.8600 416,900
18.8700 19.5000 18.8300 19.4000 356,100
19.1000 19.3900 18.4100 18.8100 334,700
19.0000 19.6800 18.9500 19.2900 384,500
16 · 8-K Pre-market · 06:01 ET 8-K ↗
Weekend
Weekend
18.9700 19.1500 18.6100 18.7200 311,100
18.8600 19.1300 18.6100 19.0200 446,600
19.9600 19.9600 18.5200 18.8800 438,700
15 · 8-K Next filing day · accepted 07 Jul, 20:03 ET 8-K ↗
20.0600 20.2800 19.7400 20.0800 450,000
19.4800 20.0100 19.0800 19.6100 313,800
Weekend
Weekend
No trading
20.3500 20.3500 19.6300 19.6400 315,800
20.3200 20.5400 19.9100 20.1000 422,100
20.7100 20.7100 19.8600 20.1800 400,200
21.1200 21.2400 19.6600 20.7100 727,100
Weekend
Weekend
21.0100 21.8100 20.8800 21.7800 624,000
21.0000 22.0000 20.7900 21.0400 481,300
19.7700 21.0900 19.7700 21.0200 701,200
18.6100 19.5800 18.5000 19.5300 660,900
18.8000 18.9000 18.2200 18.3300 767,400
Weekend
Weekend
No trading
19.5100 19.6600 18.7000 18.8100 1,327,600
19.9400 20.2600 19.1500 19.4100 1,008,500
19.9100 20.4100 19.6200 19.9600 724,200
20.1100 20.2900 19.5900 19.7100 528,500
Weekend
Weekend
19.9000 20.5500 19.9000 20.0900 377,800
20.1500 20.6500 20.1000 20.5300 463,500
20.2100 20.7700 19.9900 20.2900 405,200
19.5300 20.2700 19.5300 20.1600 506,300
19.7500 19.8500 19.3400 19.3900 559,000
Weekend
Weekend
18.8600 20.1400 18.8500 19.7400 750,300
18.2800 18.9000 18.2800 18.7000 459,200
14 · 8-K After-hours · 16:15 ET 8-K ↗
18.2600 18.3600 17.7300 18.1200 509,300
18.3600 18.6700 18.1000 18.4500 810,500
18.6300 19.0100 18.2200 18.4200 569,700
Weekend
Weekend
19.2800 19.4600 18.5500 18.8500 849,100
19.0400 19.5500 19.0200 19.3000 621,200
19.3100 19.3400 18.5000 19.1000 497,100
18.4500 19.1200 18.4500 18.8100 670,800
No trading
Weekend
Weekend
18.2500 18.4400 17.9300 18.4100 485,200
18.0700 18.3700 17.7600 18.1600 1,657,000
17.8100 18.1900 17.7000 18.0800 868,800
17.2800 17.9100 17.0000 17.8200 725,100
16.7000 17.3100 16.6500 17.2000 866,000
Weekend
Weekend
17.2700 17.5300 16.7600 16.8700 679,300
17.8100 18.0800 17.2600 17.3000 739,100
17.5000 18.5700 17.4300 18.3200 971,200
18.4100 18.5800 17.2600 17.5000 1,219,600
19.1300 19.4100 18.3300 18.4500 1,359,600
Weekend
Weekend
18.5800 19.5300 18.2800 19.0000 1,983,800
13 · 10-Q After-hours · 16:48 ET 10-Q ↗ 12 · 8-K After-hours · 16:22 ET 8-K ↗
24.0100 24.3500 23.8700 24.0300 373,500
23.5000 24.1500 23.5000 23.9000 392,800
22.8500 23.4600 22.7500 23.3900 366,900
21.8200 23.2200 21.7200 22.7400 487,100
Weekend
Weekend
21.9800 22.2600 21.6400 21.8800 353,200
21.6300 22.3600 21.5700 21.9600 407,200
21.5000 21.8600 21.4800 21.6300 268,700
21.7100 22.0400 21.5600 21.8200 281,200
21.4700 22.0600 21.4600 21.6500 329,600
Weekend
Weekend
21.0500 21.6000 20.7700 21.4100 429,700
20.9900 21.2300 20.7700 21.0100 302,600
21.4000 21.5900 20.7700 20.9900 410,800
22.3800 22.6600 21.1000 21.2100 684,200
22.6700 23.2600 22.5400 22.9200 542,000
Weekend
Weekend
22.1800 23.0000 21.9800 22.8800 537,800
21.6700 22.0200 21.4100 21.8100 361,300
21.3800 21.7600 21.1900 21.6800 389,400
21.3600 21.7000 21.1200 21.3800 343,500
11 · DEFA14A After-hours · 16:29 ET DEFA14A ↗ 10 · DEF 14A After-hours · 16:18 ET DEF 14A ↗
20.1700 21.4800 20.1700 21.3600 577,900
Weekend
Weekend
20.9800 21.1000 20.1400 20.3700 354,500
20.3200 21.1900 20.3200 20.8700 519,300
20.6800 21.0700 20.1800 20.4000 613,500
20.3900 20.8100 20.2600 20.5800 351,500
20.4500 20.7300 20.0400 20.5800 344,100
Weekend
Weekend
No trading
19.9500 20.6600 19.8800 20.4500 390,500
19.7400 20.3100 19.6800 20.2400 677,400
19.5300 20.0000 19.2700 19.5900 534,100
19.1500 19.6700 19.0700 19.2200 410,700
Weekend
Weekend
19.3700 19.6400 18.9200 19.0100 346,000
19.5000 19.8000 18.9800 19.5300 363,500
19.4500 19.9600 19.3900 19.5700 317,600
19.1000 19.5700 18.9800 19.2300 367,800
20.0400 20.0800 19.2300 19.2300 414,900
Weekend
Weekend
19.5600 19.7600 19.1500 19.5000 1,133,200
19.1000 19.8200 19.0600 19.5400 583,100
19.2100 19.4700 18.9700 19.0000 650,400
19.4800 20.0000 19.4800 19.5100 635,600
18.9300 19.4600 18.6500 19.4100 738,000
9 · 8-K Pre-market · 06:00 ET 8-K ↗
Weekend
Weekend
18.2300 18.4600 17.8100 18.1800 604,600
18.5800 18.5800 17.0300 18.1800 901,700
18.9100 19.5000 18.5200 18.7700 548,300
19.2100 19.5700 18.8400 18.9100 527,100
18.9700 19.3700 18.5200 19.2100 687,800
Weekend
Weekend
8 · 8-K After-hours · 16:17 ET 8-K ↗ 7 · 8-K After-hours · 16:12 ET 8-K ↗
20.0500 20.0800 18.9400 19.3400 753,600
19.6700 20.6000 19.5400 20.4400 726,300
19.9700 20.2000 19.5600 19.9600 595,000
20.3500 21.0700 19.8100 19.8300 740,800
20.3000 21.1400 19.9500 21.0100 1,261,300
Weekend
Weekend
22.4400 23.2700 19.8300 20.2300 1,965,500
6 · 10-K After-hours · 16:41 ET 10-K ↗ 5 · 8-K After-hours · 16:24 ET 8-K ↗
28.0000 28.1700 26.2700 26.4900 816,500
27.7300 27.9900 27.0300 27.9700 416,000
27.6500 28.3700 27.4200 27.6700 478,100
28.4200 28.7500 27.1900 27.5500 496,700
Weekend
Weekend
28.5800 28.9800 28.0300 28.5300 508,400
28.5600 28.7100 28.4200 28.5400 340,700
28.4500 29.1600 28.3600 28.6600 325,900
28.6500 29.2300 28.3900 28.4500 316,900
No trading
Weekend
Weekend
27.8200 29.0000 27.7600 28.5000 268,700
28.6200 28.6200 27.2400 27.5500 437,500
28.6200 29.0900 28.4800 28.5900 236,600
28.7500 28.9200 28.4900 28.5700 182,600
29.0800 29.2000 28.3700 28.6100 285,000
Weekend
Weekend
28.6100 29.4600 28.6100 29.2600 343,800
28.4500 29.2200 28.4500 28.6300 287,600
28.7900 29.3700 28.5600 28.6100 378,900
27.5700 28.2800 27.0600 28.2400 506,300
26.3600 28.1300 26.3400 27.9200 444,100
Weekend
Weekend
26.1500 26.6000 26.0400 26.4900 294,500
26.1000 26.4300 25.8000 26.1500 184,400
26.4500 26.4500 25.8600 26.1200 209,000
26.3900 26.5800 25.8100 26.2500 264,500
25.9200 26.7100 25.6300 26.6000 316,200
Weekend
Weekend
26.0300 26.3700 25.8100 25.9200 269,500
26.2500 26.9200 26.1000 26.1500 233,300
25.9600 26.5900 25.9300 26.2200 251,600
25.6200 26.7500 25.4700 25.9500 282,600
No trading
Weekend
Weekend
25.9400 26.2300 25.4200 26.0700 286,900
27.6500 27.6900 25.9400 26.0000 584,100
28.8000 29.2000 27.6100 27.7600 472,400
29.1600 29.3800 28.4000 28.9100 345,600
4 · 8-K After-hours · 17:15 ET 8-K ↗
28.0500 29.5200 27.3100 29.4000 455,700
Weekend
Weekend
27.7100 28.0200 27.4300 27.7400 247,200
27.4000 28.3400 27.2300 27.7400 304,400
27.8300 28.2800 27.1500 27.3300 342,800
26.5300 27.7500 26.5100 27.6200 300,100
26.2100 27.4500 26.1100 26.7200 419,200
Weekend
Weekend
26.9100 26.9300 26.0200 26.4600 406,000
No trading
27.0600 27.0600 26.6400 26.7800 218,300
26.7500 27.1600 26.7300 27.0000 251,500
27.0000 27.2300 26.7700 26.7900 220,500
Weekend
Weekend
26.7700 27.1700 26.5500 27.1200 229,000
No trading
26.4500 27.1200 26.4400 26.8100 175,200
27.2400 27.2600 26.2600 26.4500 333,300
26.5000 27.4400 26.3500 27.3200 507,300
Weekend
Weekend
26.4000 26.8000 26.3300 26.6000 812,100
26.0400 26.6200 25.9200 26.5000 340,800
25.6000 26.5200 25.4700 26.0700 389,800
26.1800 26.3100 25.1600 25.6100 499,500
25.7800 26.5000 25.5600 26.3100 472,900
Weekend
Weekend
26.1300 26.1300 25.2000 25.2700 341,400
25.8100 25.9400 25.4700 25.9000 284,900
25.6400 25.9100 25.2200 25.7100 483,500
25.9700 26.3900 25.5600 25.6500 414,100
26.8100 26.8500 25.9500 26.0100 300,900
Weekend
Weekend
27.1500 27.4700 26.6900 26.7700 323,300
27.5800 27.8400 26.9700 27.1500 404,800
26.8600 27.8200 26.7500 27.5800 317,300
27.4600 27.6200 26.2300 26.6700 456,400
27.4400 27.8200 27.3000 27.4500 355,900
Weekend
Weekend
27.4700 27.7800 27.3700 27.7000 208,300
No trading
27.4400 27.8300 27.2300 27.3600 410,900
27.0000 27.7600 26.9000 27.6900 375,500
25.9600 26.7900 25.8200 26.7100 349,500
Weekend
Weekend
25.4500 26.5300 25.4000 26.0100 392,900
25.5400 26.0100 24.9200 25.3600 355,800
25.8100 26.2800 25.1300 25.3700 524,400
25.8200 26.5700 25.3900 25.9000 484,900
26.0400 26.5400 25.6900 26.0200 417,700
Weekend
Weekend
26.1500 26.4700 25.9000 26.0600 294,100
27.6600 27.8600 26.0000 26.3700 488,800
27.1600 29.0000 27.1200 27.8300 685,800
26.0000 27.2100 26.0000 27.1600 541,200
24.0300 26.8300 23.8100 26.1200 826,300
Weekend
Weekend
26.1500 27.4000 23.6700 24.0300 809,400
3 · 10-Q After-hours · 16:38 ET 10-Q ↗ 2 · 8-K After-hours · 16:25 ET 8-K ↗
25.4100 25.5300 24.1500 24.2300 767,200
25.0700 25.6500 25.0700 25.3100 335,200
25.2000 25.4000 24.9300 25.2600 416,500
25.3000 25.8500 24.9000 25.3000 361,700
Weekend
Weekend
24.3600 25.6000 24.2400 25.5000 552,300
24.2400 24.8100 24.0200 24.6600 390,800
24.0100 24.7100 23.9000 24.2400 363,100
23.9200 24.4500 23.7700 24.1800 264,300
24.3800 24.5500 23.9800 24.0400 319,200
Weekend
Weekend
1 · 8-K After-hours · 16:21 ET 1.01 ↗
24.7200 24.8900 24.4600 24.5200 220,800

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.

18 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:50 ET Summarise
17 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:32 ET Summarise
16 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:01 ET Summarise
15 8-K 8-K (opens SEC filing in a new tab) Next filing day · accepted 07 Jul, 20:03 ET Summarise
14 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:15 ET Summarise
13 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:48 ET Summarise
12 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:22 ET Summarise
11 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:29 ET Summarise
10 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:18 ET Summarise
9 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:00 ET Summarise
8 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:17 ET Summarise
7 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:12 ET Summarise
6 10-K 10-K (opens SEC filing in a new tab) After-hours · 16:41 ET Summarise
5 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:24 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:15 ET Summarise
3 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:38 ET Summarise
2 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:25 ET Summarise
1 8-K 1.01 (opens SEC filing in a new tab) After-hours · 16:21 ET Summarise