Who owns Ambiq Micro (AMBQ)
Which tracked institutional funds hold AMBQ, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AMBQ company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on AMBQ is one-sided between 2026-Q1 and 2026-Q2: 110 added or opened and 9 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
AMBQ’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes AMBQ more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in AMBQ divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 175 tracked filers holding AMBQ, 139 increased or opened the position and 44 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in AMBQ between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 51
- D. E. Shaw & Co., Inc.$87M
- JANE STREET GROUP, LLC$26M
- NEUBERGER BERMAN GROUP LLC$24M
- EMERALD ADVISERS, LLC$22M
- VOLORIDGE INVESTMENT MANAGEMENT, LLC$20M
- WELLINGTON MANAGEMENT GROUP LLP$15M
Full exits 6
- T. Rowe Price Investment Management, Inc.$32M
- Polar Asset Management Partners Inc.$5M
- Monashee Investment Management LLC$3M
- LAZARD ASSET MANAGEMENT LLC$2M
- CenterBook Partners LP$1M
- HighTower Advisors, LLC$550K
Largest adds
- BlackRock, Inc.$96M
- STATE STREET CORP$70M
- TWO SIGMA INVESTMENTS, LP$57M
- Atreides Management, LP$56M
- VANGUARD CAPITAL MANAGEMENT LLC$50M
- GOLDMAN SACHS GROUP INC$29M
Largest trims
- ALLIANCEBERNSTEIN L.P.$4M
- Alyeska Investment Group, L.P.$1M
- UBS Group AG$1M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 1,380,623 | $122M | 9.3% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 983,916 | $87M | 6.6% | 2026-Q2 |
| Atreides Management, LP added | 877,123 | $77M | 5.9% | 2026-Q2 |
| STATE STREET CORP added | 861,979 | $76M | 5.8% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 768,539 | $68M | 5.2% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 651,786 | $58M | 4.4% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 609,607 | $15M | 1.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 446,950 | $39M | 3.0% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 339,327 | $30M | 2.3% | 2026-Q2 |
| NEEDHAM INVESTMENT MANAGEMENT LLC added | 323,700 | $29M | 2.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 315,455 | $28M | 2.1% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC added | 309,096 | $27M | 2.1% | 2026-Q2 |
| JANE STREET GROUP, LLC new | 294,802 | $26M | 2.0% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 289,206 | $26M | 1.9% | 2026-Q2 |
| Driehaus Capital Management LLC trimmed | 288,979 | $26M | 1.9% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC new | 272,126 | $24M | 1.8% | 2026-Q2 |
| First Eagle Investment Management, LLC trimmed | 244,394 | $22M | 1.6% | 2026-Q2 |
| EMERALD ADVISERS, LLC new | 243,664 | $22M | 1.6% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 223,763 | $20M | 1.5% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC new | 223,276 | $20M | 1.5% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 214,756 | $19M | 1.4% | 2026-Q2 |
| Walleye Capital LLC added | 214,528 | $19M | 1.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 204,181 | $18M | 1.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 203,273 | $18M | 1.4% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 200,790 | $17M | 1.3% | 2026-Q2 |
| MORGAN STANLEY added | 182,007 | $16M | 1.2% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 169,890 | $15M | 1.1% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP new | 168,139 | $15M | 1.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 165,367 | $15M | 1.1% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC added | 159,623 | $14M | 1.1% | 2026-Q2 |
| EMERALD MUTUAL FUND ADVISERS TRUST new | 159,131 | $14M | 1.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 156,906 | $14M | 1.1% | 2026-Q2 |
| SOFTBANK GROUP CORP. | 148,939 | $13M | 1.0% | 2026-Q2 |
| Nuveen, LLC added | 138,965 | $12M | 0.9% | 2026-Q2 |
| NORTHERN TRUST CORP added | 130,802 | $12M | 0.9% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND new | 126,029 | $11M | 0.8% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 122,425 | $11M | 0.8% | 2026-Q2 |
| Hood River Capital Management LLC new | 121,738 | $11M | 0.8% | 2026-Q2 |
| S SQUARED TECHNOLOGY, LLC trimmed | 120,773 | $11M | 0.8% | 2026-Q2 |
| MARSHALL WACE, LLP new | 109,488 | $10M | 0.7% | 2026-Q2 |
| BARCLAYS PLC added | 99,686 | $9M | 0.7% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 98,449 | $9M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 83,127 | $7M | 0.6% | 2026-Q2 |
| WASATCH ADVISORS LP trimmed | 81,559 | $7M | 0.5% | 2026-Q2 |
| Moody Aldrich Partners LLC new | 81,393 | $7M | 0.5% | 2026-Q2 |
| Point72 Asset Management, L.P. new | 77,165 | $7M | 0.5% | 2026-Q2 |
| Voleon Capital Management LP new | 75,980 | $7M | 0.5% | 2026-Q2 |
| Public Sector Pension Investment Board new | 75,200 | $7M | 0.5% | 2026-Q2 |
| Ghisallo Capital Management LLC added | 75,000 | $7M | 0.5% | 2026-Q2 |
| Trexquant Investment LP new | 73,600 | $6M | 0.5% | 2026-Q2 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC trimmed | 66,697 | $6M | 0.4% | 2026-Q2 |
| ALGERT GLOBAL LLC new | 66,008 | $6M | 0.4% | 2026-Q2 |
| Woodline Partners LP new | 64,484 | $6M | 0.4% | 2026-Q2 |
| Squarepoint Ops LLC added | 63,228 | $6M | 0.4% | 2026-Q2 |
| Roubaix Capital, LLC trimmed | 53,257 | $5M | 0.4% | 2026-Q2 |
| Informed Momentum Co LLC new | 50,968 | $5M | 0.3% | 2026-Q2 |
| Burkehill Global Management, LP new | 50,000 | $4M | 0.3% | 2026-Q2 |
| LMR Partners LLP added | 50,000 | $4M | 0.3% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 49,508 | $4M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 48,659 | $4M | 0.3% | 2026-Q2 |
| FMR LLC added | 44,634 | $4M | 0.3% | 2026-Q2 |
| READYSTATE ASSET MANAGEMENT LP trimmed | 37,930 | $3M | 0.3% | 2026-Q2 |
| UBS Group AG trimmed | 35,786 | $3M | 0.2% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 35,400 | $3M | 0.2% | 2026-Q2 |
| ELEMENT CAPITAL MANAGEMENT LLC new | 34,257 | $3M | 0.2% | 2026-Q2 |
| G2 Investment Partners Management LLC new | 33,000 | $3M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO new | 31,411 | $3M | 0.2% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC new | 30,196 | $3M | 0.2% | 2026-Q2 |
| TITAN GLOBAL CAPITAL MANAGEMENT USA LLC new | 29,554 | $3M | 0.2% | 2026-Q2 |
| Numerai GP LLC new | 24,192 | $2M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 23,821 | $2M | 0.2% | 2026-Q2 |
| TD Asset Management Inc trimmed | 22,758 | $2M | 0.2% | 2026-Q2 |
| KORNITZER CAPITAL MANAGEMENT INC /KS trimmed | 22,023 | $2M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 21,856 | $2M | 0.1% | 2026-Q2 |
| OCCUDO QUANTITATIVE STRATEGIES LP new | 21,398 | $2M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 21,001 | $2M | 0.1% | 2026-Q2 |
| Toronado Partners, LLC trimmed | 19,225 | $2M | 0.1% | 2026-Q2 |
| Capital Asset Advisory Services LLC | 18,928 | $2M | 0.1% | 2026-Q2 |
| AXXCESS WEALTH MANAGEMENT, LLC new | 18,928 | $2M | 0.1% | 2026-Q2 |
| GLENMEDE TRUST CO NA new | 18,329 | $2M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 17,012 | $2M | 0.1% | 2026-Q2 |
| XTX Topco Ltd trimmed | 16,723 | $1M | 0.1% | 2026-Q2 |
| Quadrature Capital Ltd added | 16,432 | $1M | 0.1% | 2026-Q2 |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 13,679 | $1M | 0.1% | 2026-Q2 |
| Ilex Capital Partners (UK) LLP new | 13,515 | $1M | 0.1% | 2026-Q2 |
| Lighthouse Investment Partners, LLC new | 12,834 | $1M | 0.1% | 2026-Q2 |
| Quantbot Technologies LP trimmed | 12,832 | $1M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 12,268 | $1M | 0.1% | 2026-Q2 |
| STIFEL FINANCIAL CORP trimmed | 12,112 | $1M | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC new | 11,532 | $1M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 10,932 | $965K | 0.1% | 2026-Q2 |
| FORA Capital, LLC new | 10,902 | $963K | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP new | 10,878 | $961K | 0.1% | 2026-Q2 |
| State of Wyoming new | 10,658 | $941K | 0.1% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC new | 10,630 | $939K | 0.1% | 2026-Q2 |
| Alyeska Investment Group, L.P. trimmed | 10,329 | $912K | 0.1% | 2026-Q2 |
| Invesco Ltd. new | 10,205 | $901K | 0.1% | 2026-Q2 |
| ProShare Advisors LLC new | 9,227 | $815K | 0.1% | 2026-Q2 |
| Spark Investment Management LLC new | 8,800 | $777K | 0.1% | 2026-Q2 |
| Perpetual Ltd trimmed | 8,671 | $766K | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.