Ticker: AMPX CUSIP: 03214Q108 Class: Common Stock
Note: Option positions (PUT/CALL) are excluded.
| Institution | Shares | Value ($000) |
|---|---|---|
| Worth Venture Partners, LLC | 10,875 | $86 |
| HUSSMAN STRATEGIC ADVISORS, INC. | 210,000 | $1,657 |
| AlphaCentric Advisors LLC | 50,000 | $395 |
| Bayforest Capital Ltd | 36,882 | $291 |
| Faithward Advisors, LLC | 101,175 | $798 |
| Hood River Capital Management LLC | 809,744 | $6,389 |
| MANGROVE PARTNERS IM, LLC | 116,624 | $920 |
| Hudson Bay Capital Management LP | 1,100,000 | $8,679 |
| Scientech Research LLC | 12,810 | $101 |
| Bridgefront Capital, LLC | 20,609 | $163 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 984,906 | $7,771 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | 359,386 | $2,836 |
| Granahan Investment Management, LLC | 64,382 | $508 |
| Cambridge Financial Group, LLC | 10,000 | $78 |
| Qube Research & Technologies Ltd | 874,080 | $6,896 |
| Lombard Odier Asset Management (USA) Corp | 23,942 | $189 |
| Alberta Investment Management Corp | 126,900 | $1,001 |
| Polar Asset Management Partners Inc. | 78,600 | $620 |
| CAPITAL PERFORMANCE ADVISORS LLP | 13,974 | $110 |
| NORGES BANK | 1,304,838 | $10,295 |
| Institution | Prev Shares | Curr Shares | Change |
|---|---|---|---|
| OSTERWEIS CAPITAL MANAGEMENT INC | 187,445 | 454,830 | +267,385 (+142.6%) |
| JUPITER ASSET MANAGEMENT LTD | 199,385 | 960,912 | +761,527 (+381.9%) |
| PharVision Advisers, LLC | 26,558 | 42,991 | +16,433 (+61.9%) |
| CoreCommodity Management, LLC | 38,770 | 74,022 | +35,252 (+90.9%) |
| Stephens Investment Management Group LLC | 1,082,907 | 1,441,698 | +358,791 (+33.1%) |
| FOX RUN MANAGEMENT, L.L.C. | 32,523 | 74,774 | +42,251 (+129.9%) |
| SLT Holdings LLC | 120,300 | 123,300 | +3,000 (+2.5%) |
| Voleon Capital Management LP | 33,507 | 191,170 | +157,663 (+470.5%) |
| FORA Capital, LLC | 13,391 | 38,928 | +25,537 (+190.7%) |
| Numerai GP LLC | 74,511 | 96,209 | +21,698 (+29.1%) |
| Engineers Gate Manager LP | 188,824 | 360,401 | +171,577 (+90.9%) |
| OPPENHEIMER & CO INC | 299,339 | 442,090 | +142,751 (+47.7%) |
| DARK FOREST CAPITAL MANAGEMENT LP | 20,133 | 71,885 | +51,752 (+257.1%) |
| BOOTHBAY FUND MANAGEMENT, LLC | 16,114 | 112,324 | +96,210 (+597.1%) |
| Inspire Investing, LLC | 43,830 | 60,242 | +16,412 (+37.4%) |
| Point72 Asset Management, L.P. | 33,916 | 493,862 | +459,946 (+1356.1%) |
| Huntleigh Advisors, Inc. | 156,066 | 160,599 | +4,533 (+2.9%) |
| SEI INVESTMENTS CO | 78,720 | 431,786 | +353,066 (+448.5%) |
| Walleye Capital LLC | 130,775 | 269,406 | +138,631 (+106.0%) |
| MILLENNIUM MANAGEMENT LLC | 587,832 | 1,085,270 | +497,438 (+84.6%) |
| Institution | Prev Shares | Curr Shares | Change |
|---|---|---|---|
| ESSEX INVESTMENT MANAGEMENT CO LLC | 697,387 | 516,765 | -180,622 (-25.9%) |
| EAM Investors, LLC | 488,530 | 236,810 | -251,720 (-51.5%) |
| Lisanti Capital Growth, LLC | 265,725 | 198,890 | -66,835 (-25.2%) |
| DRIEHAUS CAPITAL MANAGEMENT LLC | 3,090,669 | 2,393,212 | -697,457 (-22.6%) |
| Jump Financial, LLC | 242,700 | 10,381 | -232,319 (-95.7%) |
| Trexquant Investment LP | 249,288 | 31,010 | -218,278 (-87.6%) |
| Caitong International Asset Management Co., Ltd | 15,220 | 8,362 | -6,858 (-45.1%) |
| ALGERT GLOBAL LLC | 383,019 | 132,650 | -250,369 (-65.4%) |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | 1,876,140 | 1,602,001 | -274,139 (-14.6%) |
| KINGSWOOD WEALTH ADVISORS, LLC | 77,705 | 47,705 | -30,000 (-38.6%) |
| BNP PARIBAS ARBITRAGE, SA | 1,943,905 | 707,079 | -1,236,826 (-63.6%) |
| TWO SIGMA ADVISERS, LP | 812,000 | 479,500 | -332,500 (-40.9%) |
| CITADEL ADVISORS LLC | 2,506,799 | 454,854 | -2,051,945 (-81.9%) |
| TWO SIGMA INVESTMENTS, LP | 1,753,577 | 1,436,939 | -316,638 (-18.1%) |
| Counterpoint Mutual Funds LLC | 47,639 | 33,040 | -14,599 (-30.6%) |
| Invesco Ltd. | 2,379,384 | 1,311,915 | -1,067,469 (-44.9%) |
| JANE STREET GROUP, LLC | 676,664 | 213,425 | -463,239 (-68.5%) |
| Baird Financial Group, Inc. | 876,927 | 773,428 | -103,499 (-11.8%) |
| Richmond Investment Services, LLC | 14,796 | 10,858 | -3,938 (-26.6%) |
| JPMORGAN CHASE & CO | 287,716 | 83,449 | -204,267 (-71.0%) |
| Institution | Prev Shares | Prev Value ($000) |
|---|---|---|
| NEXT CENTURY GROWTH INVESTORS LLC | 228,628 | $2,405 |
| Harbour Capital Advisors, LLC | 40,315 | $511 |
| Dynamic Technology Lab Private Ltd | 51,550 | $542 |
| Diametric Capital, LP | 31,740 | $334 |
| XTX Topco Ltd | 173,005 | $1,820 |
| Capitolis Liquid Global Markets LLC | 680,600 | $7,160 |
| Entropy Technologies, LP | 90,101 | $948 |
| Aigen Investment Management, LP | 27,190 | $286 |
| Quantbot Technologies LP | 131,922 | $1,388 |
| Quadrature Capital Ltd | 180,197 | $1,897 |
| TUDOR INVESTMENT CORP ET AL | 715,736 | $7,530 |
| IPG Investment Advisors LLC | 10,950 | $115 |
| PRELUDE CAPITAL MANAGEMENT, LLC | 14,018 | $147 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 471,791 | $4,963 |
| OMERS ADMINISTRATION Corp | 64,400 | $677 |
| Brevan Howard Capital Management LP | 69,792 | $734 |
| Atom Investors LP | 10,472 | $110 |
| Schonfeld Strategic Advisors LLC | 65,386 | $688 |
| STATE OF WISCONSIN INVESTMENT BOARD | 31,944 | $336 |
| GROUP ONE TRADING, L.P. | 28,891 | $304 |