DaveManuel.com · Institutional Ownership · Who Owns It
AMBIQ MICRO INC (AMBQ)
Institutional ownership reported to the SEC as of Q2 2026, across 5 quarters.
185
Reporting holders
$1.5B
Reported value
72.3%
Of shares outstanding
0.9%
Calls
0.4%
Puts
+88
Holder change
Institutions report 17,491,540 shares against 24,184,536 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $121.9M | 1,380,623 | 0.00% | 4q | +36.3%+$32.4M |
| T. Rowe Price Investment Management, Inc. | $88.9M | 1,006,359 | 0.06% | 2q | -20.6%-$23.1M |
| D. E. Shaw & Co., Inc. | $86.9M | 983,916 | 0.04% | new | NEW |
| Atreides Management, LP | $77.4M | 877,123 | 0.54% | 4q | +1.7%+$1.3M |
| STATE STREET CORP | $76.1M | 861,979 | 0.00% | 4q | +231.2%+$53.1M |
| VANGUARD CAPITAL MANAGEMENT LLC | $67.9M | 768,539 | 0.00% | 2q | +8.6%+$5.4M |
| TWO SIGMA INVESTMENTS, LP | $57.6M | 651,786 | 0.04% | 2q | +1671.4%+$54.3M |
| First Eagle Investment Management, LLC | $43.2M | 488,788 | 0.04% | 4q | +75.1%+$18.5M |
| GOLDMAN SACHS GROUP INC | $39.5M | 446,950 | 0.00% | 4q | +8.1%+$3.0M |
| GEODE CAPITAL MANAGEMENT, LLC | $30.0M | 339,327 | 0.00% | 4q | +14.0%+$3.7M |
| NEEDHAM INVESTMENT MANAGEMENT LLC | $28.6M | 323,700 | 0.86% | 2q | +61.9%+$10.9M |
| JANE STREET GROUP, LLC | $28.3M incl. $2.3M options CALL+PUT | 294,802 | 0.00% | new | NEW |
| Schonfeld Strategic Advisors LLC | $27.9M | 315,455 | 0.10% | 4q | -52.0%-$30.1M |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | $27.3M | 309,096 | 0.18% | 4q | +9.5%+$2.4M |
| MILLENNIUM MANAGEMENT LLC | $25.5M | 289,206 | 0.01% | 3q | +62.9%+$9.9M |
| Driehaus Capital Management LLC | $25.5M | 288,979 | 0.15% | 2q | -24.1%-$8.1M |
| NEUBERGER BERMAN GROUP LLC | $24.0M | 272,126 | 0.02% | new | NEW |
| EMERALD ADVISERS, LLC | $21.5M | 243,664 | 0.51% | new | NEW |
| HRT FINANCIAL LP | $19.9M | 225,639 | 0.04% | new | NEW |
| FRANKLIN RESOURCES INC | $19.8M | 223,763 | 0.00% | 4q | -58.7%-$28.1M |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | $19.7M | 223,276 | 0.08% | new | NEW |
| COOPER CREEK PARTNERS MANAGEMENT LLC | $19.4M | 220,000 | 0.46% | new | NEW |
| RENAISSANCE TECHNOLOGIES LLC | $19.0M | 214,756 | 0.03% | 2q | +404.1%+$15.2M |
| Walleye Capital LLC | $18.9M | 214,528 | 0.07% | 4q | +1777.0%+$17.9M |
| BNP PARIBAS FINANCIAL MARKETS | $18.0M | 204,181 | 0.01% | 4q | +5150.2%+$17.7M |
| BANK OF AMERICA CORP /DE/ | $17.9M | 203,273 | 0.00% | 4q | +323.2%+$13.7M |
| JPMORGAN CHASE & CO | $17.1M | 200,790 | 0.00% | 4q | +162.4%+$10.6M |
| CITADEL ADVISORS LLC | $17.1M incl. $6.2M options CALL+PUT | 122,425 | 0.00% | new | NEW |
| MORGAN STANLEY | $16.1M | 182,007 | 0.00% | 4q | +479.5%+$13.3M |
| ALLIANCEBERNSTEIN L.P. | $15.5M | 609,607 | 0.01% | 4q | -11.1%-$1.9M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $15.0M | 169,890 | 0.00% | 2q | +6.9%+$970.3K |
| WELLINGTON MANAGEMENT GROUP LLP | $14.8M | 168,139 | 0.00% | new | NEW |
| DEUTSCHE BANK AG\ | $14.6M | 165,367 | 0.00% | 4q | +618.7%+$12.6M |
| GILDER GAGNON HOWE & CO LLC | $14.1M | 159,623 | 0.15% | 4q | +45.7%+$4.4M |
| EMERALD MUTUAL FUND ADVISERS TRUST | $14.1M | 159,131 | 0.49% | new | NEW |
| PRICE T ROWE ASSOCIATES INC /MD/ | $13.9M | 156,906 | 0.00% | 2q | +950.5%+$12.5M |
| SOFTBANK GROUP CORP. | $13.2M | 148,939 | 0.07% | 4q | HELD |
| Nuveen, LLC | $12.3M | 138,965 | 0.00% | 2q | +289.0%+$9.1M |
| NORTHERN TRUST CORP | $11.5M | 130,802 | 0.00% | 4q | +18.0%+$1.8M |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $11.1M | 126,029 | 0.02% | new | NEW |
| Hood River Capital Management LLC | $10.7M | 121,738 | 0.08% | new | NEW |
| S SQUARED TECHNOLOGY, LLC | $10.7M | 120,773 | 3.31% | 2q | -37.3%-$6.4M |
| LORD, ABBETT & CO. LLC | $10.5M | 118,432 | 0.03% | new | NEW |
| MARSHALL WACE, LLP | $9.7M | 109,488 | 0.01% | new | NEW |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $9.3M incl. $8.6M options CALL+PUT | 7,726 | 0.00% | new | NEW |
| BARCLAYS PLC | $8.8M | 99,686 | 0.00% | 4q | +2007.1%+$8.4M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $8.7M | 98,449 | 0.00% | 4q | +21.4%+$1.5M |
| VANGUARD FIDUCIARY TRUST CO | $7.3M | 83,127 | 0.00% | 2q | +27.8%+$1.6M |
| WASATCH ADVISORS LP | $7.2M | 81,559 | 0.05% | 4q | -67.9%-$15.3M |
| Moody Aldrich Partners LLC | $7.2M | 81,393 | 1.29% | new | NEW |
| ACADIAN ASSET MANAGEMENT LLC | $7.0M | 78,902 | 0.01% | new | NEW |
| Point72 Asset Management, L.P. | $6.8M | 77,165 | 0.01% | new | NEW |
| Voleon Capital Management LP | $6.7M | 75,980 | 0.12% | new | NEW |
| Public Sector Pension Investment Board | $6.6M | 75,200 | 0.02% | new | NEW |
| Ghisallo Capital Management LLC | $6.6M | 75,000 | 0.13% | 4q | +275.0%+$4.9M |
| Trexquant Investment LP | $6.5M | 73,600 | 0.04% | new | NEW |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | $5.9M | 66,697 | 0.10% | 4q | -57.1%-$7.8M |
| ALGERT GLOBAL LLC | $5.8M | 66,008 | 0.07% | new | NEW |
| Woodline Partners LP | $5.7M | 64,484 | 0.02% | new | NEW |
| Squarepoint Ops LLC | $5.6M | 63,228 | 0.01% | 2q | +603.5%+$4.8M |
| Roubaix Capital, LLC | $4.7M | 53,257 | 1.69% | 2q | -57.7%-$6.4M |
| Informed Momentum Co LLC | $4.5M | 50,968 | 0.40% | new | NEW |
| LMR Partners LLP | $4.4M | 50,000 | 0.02% | new | NEW |
| Burkehill Global Management, LP | $4.4M | 50,000 | 0.16% | new | NEW |
| TUDOR INVESTMENT CORP ET AL | $4.4M | 49,508 | 0.01% | new | NEW |
| Bank of New York Mellon Corp | $4.3M | 48,659 | 0.00% | 4q | +15.8%+$585.3K |
| FMR LLC | $3.9M | 44,634 | 0.00% | 4q | +5749.8%+$3.9M |
| READYSTATE ASSET MANAGEMENT LP | $3.3M | 37,930 | 0.11% | 4q | -9.5%-$352.1K |
| UBS Group AG | $3.2M | 35,786 | 0.00% | 4q | -78.4%-$11.5M |
| LOS ANGELES CAPITAL MANAGEMENT LLC | $3.1M | 35,400 | 0.01% | 3q | -61.8%-$5.0M |
| ELEMENT CAPITAL MANAGEMENT LLC | $3.0M | 34,257 | 0.09% | new | NEW |
| G2 Investment Partners Management LLC | $2.9M | 33,000 | 0.53% | new | NEW |
| SEI INVESTMENTS CO | $2.8M | 31,411 | 0.00% | new | NEW |
| JACOBS LEVY EQUITY MANAGEMENT, INC | $2.7M | 30,196 | 0.01% | new | NEW |
| TITAN GLOBAL CAPITAL MANAGEMENT USA LLC | $2.6M | 29,554 | 0.33% | new | NEW |
| Numerai GP LLC | $2.1M | 24,192 | 0.17% | new | NEW |
| AMERIPRISE FINANCIAL INC | $2.1M | 23,821 | 0.00% | 4q | -35.2%-$1.1M |
| GSA CAPITAL PARTNERS LLP | $2.0M | 22,899 | 0.13% | new | NEW |
| TD Asset Management Inc | $2.0M | 22,758 | 0.00% | 2q | -4.3%-$89.4K |
| KORNITZER CAPITAL MANAGEMENT INC /KS | $1.9M | 22,023 | 0.04% | 4q | -16.7%-$390.2K |
| RHUMBLINE ADVISERS | $1.9M | 21,856 | 0.00% | 4q | +55.7%+$690.4K |
| HighTower Advisors, LLC | $1.9M | 21,768 | 0.00% | 2q | +0.5%+$10.2K |
| OCCUDO QUANTITATIVE STRATEGIES LP | $1.9M | 21,398 | 0.10% | new | NEW |
| CITIGROUP INC | $1.9M | 21,001 | 0.00% | 4q | +389.1%+$1.5M |
| IMC-Chicago, LLC | $1.8M incl. $1.6M options CALL+PUT | 2,291 | 0.00% | new | NEW |
| Toronado Partners, LLC | $1.7M | 19,225 | 4.78% | 2q | -9.4%-$176.3K |
| Capital Asset Advisory Services LLC | $1.7M | 18,928 | 0.06% | 2q | HELD |
| AXXCESS WEALTH MANAGEMENT, LLC | $1.7M | 18,928 | 0.03% | new | NEW |
| GLENMEDE TRUST CO NA | $1.6M | 18,329 | 0.01% | new | NEW |
| WELLS FARGO & COMPANY/MN | $1.5M | 17,012 | 0.00% | 4q | +147.6%+$895.5K |
| XTX Topco Ltd | $1.5M | 16,723 | 0.02% | 2q | -32.7%-$718.0K |
| Quadrature Capital Ltd | $1.5M | 16,432 | 0.01% | 2q | +48.7%+$475.1K |
| ESSEX INVESTMENT MANAGEMENT CO LLC | $1.2M | 13,679 | 0.16% | 2q | -28.8%-$488.9K |
| Ilex Capital Partners (UK) LLP | $1.2M | 13,515 | 0.02% | new | NEW |
| Lighthouse Investment Partners, LLC | $1.1M | 12,834 | 0.03% | new | NEW |
| Quantbot Technologies LP | $1.1M | 12,832 | 0.04% | 3q | -15.3%-$205.2K |
| Russell Investments Group, Ltd. | $1.1M | 12,268 | 0.00% | 4q | +763.3%+$957.8K |
| STIFEL FINANCIAL CORP | $1.1M | 12,112 | 0.00% | 2q | -56.3%-$1.4M |
| ENVESTNET ASSET MANAGEMENT INC | $1.0M | 11,532 | 0.00% | new | NEW |
| MetLife Investment Management, LLC | $965.3K | 10,932 | 0.00% | 2q | +7.5%+$67.4K |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-10-27 | 13G/A | BlackRock, Inc. | 6.7% |
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-27 | Chen Timothy | Director | Sold | 70,592 | $5.6M ×4 |
| 2026-05-14 | Esaka Fumihide | Chief Executive Officer | Sold | 60,000 | $4.2M |
| 2026-05-15 | Chen Sean Chihhsiang | President and COO | Sold | 55,685 | $3.9M ×2 |
| 2026-09-11 | Esaka Fumihide | Chief Executive Officer | Sold | 50,000 | $3.2M ×2 |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Sold | 48,500 | $2.8M ×6 |
| 2026-09-01 | Esaka Fumihide | Chief Executive Officer | Sold | 48,973 | $2.8M |
| 2026-05-14 | Winzeler Jeffrey G | Chief Financial Officer | Sold | 26,000 | $1.8M ×2 |
| 2026-08-27 | Hanson Scott McLean | Chief Technology Officer | Sold | 27,500 | $1.6M ×2 |
| 2026-08-26 | Hanson Scott McLean | Chief Technology Officer | Sold | 27,500 | $1.6M |
| 2026-10-02 | Esaka Fumihide | Chief Executive Officer | Sold | 16,560 | $1.2M ×3 |
| 2026-09-14 | Chen Sean Chihhsiang | President and COO | Sold | 15,000 | $902.1K ×3 |
| 2026-08-14 | Esaka Fumihide | Chief Executive Officer | Sold | 13,500 | $869.2K ×3 |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 22 | $22.9M | 335,910 | 7 | 8 | 6 | 0.0% |
| Q2 2026 | 185 | $1.5B | 17,491,540 | 104 | 51 | 31 | 1.3% |
| Q1 2026 | 97 | $281.5M | 10,993,196 | 32 | 48 | 7 | 0.0% |
| Q4 2025 | 74 | $135.4M | 4,750,139 | 16 | 26 | 17 | 0.0% |
| Q3 2025 | 72 | $135.8M | 4,548,516 | 72 | 0 | 0 | 0.0% |