AMPH · Amphastar Pharmaceuticals, Inc.
$20.91
+0.73 (+3.62%)
At close · Aug 14
Market Cap
$889.47M
Shares
42.54M
Weekly off-exchange (dark pool / OTC) trading volume reported to FINRA under its OTC/ATS Transparency data. ATS volume is executed on alternating trading systems (dark pools); non-ATS OTC is other over-the-counter dealer volume. The off-exchange share is total off-exchange volume as a percentage of consolidated weekly trading volume for the same Monday–Friday week.
Off-Exchange Volume History
| Week Start | ATS Volume | Non-ATS OTC Volume | Total Off-Exchange | % of FINRA Weekly Volume |
|---|---|---|---|---|
| 2026-07-06 | 553,167 | 188,833 | 742,000 | 37.9% |
| 2026-06-29 | 487,129 | 177,908 | 665,037 | 35.7% |
| 2026-06-22 | 629,113 | 360,394 | 989,507 | 30.6% |
| 2026-06-15 | 604,142 | 830,985 | 1,435,127 | 40.0% |
| 2026-06-08 | 523,944 | 264,096 | 788,040 | 34.1% |
| 2026-06-01 | 610,620 | 320,853 | 931,473 | 30.1% |
| 2026-05-25 | 573,352 | 361,290 | 934,642 | 35.4% |
| 2026-05-18 | 987,128 | 1,144,596 | 2,131,724 | 46.3% |
| 2026-05-11 | 1,355,557 | 757,967 | 2,113,524 | 42.5% |
| 2026-05-04 | 1,175,010 | 392,103 | 1,567,113 | 43.5% |
| 2026-04-27 | 445,169 | 159,378 | 604,547 | 36.9% |
| 2026-04-20 | 628,606 | 232,596 | 861,202 | 36.3% |
| 2026-04-13 | 604,678 | 289,551 | 894,229 | 40.5% |
| 2026-04-06 | 489,556 | 199,647 | 689,203 | 31.6% |
| 2026-03-30 | 589,860 | 157,586 | 747,446 | 37.1% |
| 2026-03-23 | 413,748 | 281,757 | 695,505 | 38.4% |
| 2026-03-16 | 709,679 | 523,742 | 1,233,421 | 33.0% |
| 2026-03-09 | 833,102 | 520,931 | 1,354,033 | 41.4% |
| 2026-03-02 | 995,310 | 701,538 | 1,696,848 | 41.6% |
| 2026-02-23 | 1,136,659 | 863,632 | 2,000,291 | 47.9% |
| 2026-02-16 | 445,541 | 170,805 | 616,346 | 41.3% |
| 2026-02-09 | 382,360 | 139,721 | 522,081 | 37.0% |
| 2026-02-02 | 516,005 | 227,917 | 743,922 | 37.9% |
| 2026-01-26 | 324,823 | 145,075 | 469,898 | 37.0% |
| 2026-01-19 | 297,358 | 123,696 | 421,054 | 40.6% |
| 2026-01-12 | 724,208 | 220,757 | 944,965 | 44.1% |
| 2026-01-05 | 431,266 | 198,516 | 629,782 | 39.0% |
| 2025-12-29 | 246,865 | 297,397 | 544,262 | 49.6% |
| 2025-12-22 | 315,078 | 194,196 | 509,274 | 40.9% |
| 2025-12-15 | 514,110 | 540,089 | 1,054,199 | 41.9% |
| 2025-12-08 | 535,936 | 231,596 | 767,532 | 42.1% |
| 2025-12-01 | 470,596 | 209,441 | 680,037 | 36.6% |
| 2025-11-24 | 348,014 | 132,727 | 480,741 | 35.8% |
| 2025-11-17 | 597,090 | 360,171 | 957,261 | 44.0% |
| 2025-11-10 | 783,259 | 338,289 | 1,121,548 | 39.5% |
| 2025-11-03 | 816,248 | 229,971 | 1,046,219 | 38.9% |
| 2025-10-27 | 496,112 | 291,116 | 787,228 | 41.7% |
| 2025-10-20 | 402,716 | 350,022 | 752,738 | 44.2% |
| 2025-10-13 | 461,688 | 244,304 | 705,992 | 37.5% |
| 2025-10-06 | 454,595 | 311,908 | 766,503 | 39.7% |
| 2025-09-29 | 378,059 | 311,295 | 689,354 | 37.0% |
| 2025-09-22 | 387,169 | 373,162 | 760,331 | 39.8% |
| 2025-09-15 | 626,702 | 609,935 | 1,236,637 | 33.6% |
| 2025-09-08 | 431,522 | 264,339 | 695,861 | 39.3% |
| 2025-09-01 | 448,027 | 383,416 | 831,443 | 42.6% |
| 2025-08-25 | 470,563 | 207,069 | 677,632 | 39.5% |
| 2025-08-18 | 679,260 | 322,631 | 1,001,891 | 42.1% |
Showing 1–47 of 47 weeks
Key facts
CIK
1297184
CUSIP
03209R103
13F (30d)
191 filings
189 filers
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