Ambiq Micro, Inc. (AMBQ) Ownership
AMBQ ownership summary
as of October 18, 2026- Institutions
- 82.6% of shares outstanding
- Insiders
- 4.86% of shares outstanding
- Shares outstanding
- 24.2M
- Float
- 21.6M shares available to trade
- Short interest
- 10.66% 2.4M shares short
- Days to cover
- 4.21 short interest up 34.9% vs prior month
- Institutions 82.59%
- Insiders 4.86%
- Other investors 12.55%
AMBQ top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 5.71% | 1.4M | $68.9M | +367,462 (+36.3%) | June 30, 2026 |
| 2 | T. Rowe Price Investment Management,Inc. | 4.16% | 1.0M | $50.2M | −261,192 (−20.6%) | June 30, 2026 |
| 3 | D. E. Shaw & Co LP | 4.07% | 984K | $49.1M | +983,916 (0.0%) | June 30, 2026 |
| 4 | Atreides Management, LP | 3.63% | 877K | $43.8M | +14,948 (+1.7%) | June 30, 2026 |
| 5 | State Street Corp | 3.56% | 862K | $43.0M | +601,752 (+231.2%) | June 30, 2026 |
| 6 | Vanguard Capital Management, LLC | 3.18% | 769K | $38.3M | +61,135 (+8.6%) | June 30, 2026 |
| 7 | Two Sigma Investments LLC | 2.70% | 652K | $32.5M | +614,992 (+1,671.4%) | June 30, 2026 |
| 8 | AllianceBernstein L.P. | 2.52% | 610K | $30.4M | −76,491 (−11.1%) | June 30, 2026 |
| 9 | Arnhold & S. Bleichroeder Advisers, LLC | 2.02% | 489K | $24.4M | +209,715 (+75.1%) | June 30, 2026 |
| 10 | The Goldman Sachs Group Inc | 1.85% | 447K | $22.3M | +33,524 (+8.1%) | June 30, 2026 |
| 11 | Geode Capital Management, LLC | 1.40% | 339K | $16.9M | +41,779 (+14.0%) | June 30, 2026 |
| 12 | Needham Investment Management, LLC | 1.34% | 324K | $16.1M | +123,700 (+61.9%) | June 30, 2026 |
| 13 | Schonfeld Strategic Advisors LLC | 1.30% | 315K | $15.7M | −341,097 (−52.0%) | June 30, 2026 |
| 14 | Silvercrest Asset Management Group LLC | 1.28% | 309K | $15.4M | +26,723 (+9.5%) | June 30, 2026 |
| 15 | Jane Street Group LLC | 1.22% | 295K | $14.7M | +294,802 (0.0%) | June 30, 2026 |
| 16 | Millennium Management LLC | 1.20% | 289K | $14.4M | +111,650 (+62.9%) | June 30, 2026 |
| 17 | Driehaus Capital Management LLC | 1.19% | 289K | $14.4M | −91,789 (−24.1%) | June 30, 2026 |
| 18 | Neuberger Berman Group LLC | 1.13% | 272K | $13.6M | +272,126 (0.0%) | June 30, 2026 |
| 19 | Emerald Advisers, LLC | 1.01% | 244K | $12.2M | +243,664 (0.0%) | June 30, 2026 |
| 20 | HRT FINANCIAL LLC | 0.93% | 226K | $11.3M | +225,639 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 16 holders added 4.2M shares and 4 cut 771K.
AMBQ top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.66% | 643K | $32.1M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.22% | 537K | $26.8M | −6,208 (−1.1%) | September 30, 2026 |
| 3 | State Street® SPDR® S&P® Smcndctr ETF | 2.19% | 529K | $26.4M | +2,244 (+0.4%) | September 30, 2026 |
| 4 | L&G Artificial Intelligence ETF | 2.02% | 487K | $24.3M | −1,204 (−0.2%) | September 30, 2026 |
| 5 | AB Small Cap Growth A | 1.46% | 353K | $17.6M | +81,073 (+29.8%) | August 31, 2026 |
| 6 | Needham Aggressive Growth Retail | 1.15% | 279K | $13.9M | +103,990 (+59.4%) | June 30, 2026 |
| 7 | Fidelity Small Cap Index | 0.84% | 203K | $10.1M | +1,719 (+0.9%) | July 31, 2026 |
| 8 | Templeton Global Smaller Comp A | 0.80% | 195K | $9.7M | — | August 31, 2026 |
| 9 | iShares Russell 2000 Growth ETF | 0.80% | 194K | $9.7M | −246 (−0.1%) | September 30, 2026 |
| 10 | Principal SmallCap Growth I Instl | 0.77% | 186K | $9.3M | +39,513 (+26.9%) | August 31, 2026 |
| 11 | Stt Strt®SPDR®S&PKenshoNwEcosComposETF | 0.63% | 152K | $7.6M | — | September 30, 2026 |
| 12 | T. Rowe Price Small-Cap Value | 0.54% | 129K | $6.5M | −1,187 (−0.9%) | August 31, 2026 |
| 13 | Fidelity Enhanced Small Cap Core ETF | 0.51% | 124K | $6.2M | +258 (+0.2%) | September 30, 2026 |
| 14 | Schwab US Small-Cap ETF™ | 0.48% | 116K | $5.8M | +72 (+0.1%) | September 30, 2026 |
| 15 | Emerald Growth A | 0.48% | 115K | $5.7M | +17,697 (+18.2%) | August 31, 2026 |
| 16 | Robo Global® Artificial Intelligence ETF | 0.46% | 111K | $5.5M | +1,088 (+1.0%) | September 30, 2026 |
| 17 | Heptagon Driehaus US Micro Cap Eq C$ Acc | 0.45% | 108K | $5.4M | +43,936 (+68.3%) | August 31, 2026 |
| 18 | Vanguard Russell 2000 ETF | 0.44% | 107K | $5.3M | +2,478 (+2.4%) | August 31, 2026 |
| 19 | CREF Total Global Stock Account R3 | 0.41% | 100K | $5.0M | — | July 31, 2026 |
| 20 | Wasatch Micro Cap | 0.33% | 81K | $4.0M | −170,977 (−67.9%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
AMBQ insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-02 | Michele Kim Connors | Sell | $26.15 | 811 | $21,208 |
| 2026-01-26 | Joseph A Tautges | Sell | $31.00 | 7,800 | $241,800 |
| 2026-01-26 | Scott Mclean Hanson | Sell | $31.00 | 10,000 | $310,000 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
Who owns AMBQ
Institutional investors own 82.6% of Ambiq Micro's shares and insiders 4.86%. The largest holder is BlackRock Inc with 5.71% of the shares (1.4M), as of June 30, 2026. Among the top 20 institutions, 16 added shares and 4 reduced their stake in the latest filings. Short interest is 10.66% of the float, or 4.21 days of average trading volume.
Related: AMBQ analyst forecast, AMBQ key metrics. See the AMBQ stock overview for the latest quote and news.
AMBQ ownership FAQ
Who owns the most Ambiq Micro stock?
The largest shareholders of Ambiq Micro are BlackRock Inc (5.71%), T. Rowe Price Investment Management,Inc. (4.16%), D. E. Shaw & Co LP (4.07%), Atreides Management, LP (3.63%), State Street Corp (3.56%).
What percentage of Ambiq Micro is owned by institutions?
Institutions hold 82.6% of Ambiq Micro's shares outstanding; insiders hold 4.86%.
Which funds own Ambiq Micro?
The largest fund holders of Ambiq Micro are Vanguard MStar Total Stk Mkt Idx Invest (2.66%), iShares Russell 2000 ETF (2.22%), State Street® SPDR® S&P® Smcndctr ETF (2.19%), L&G Artificial Intelligence ETF (2.02%), AB Small Cap Growth A (1.46%).
What is Ambiq Micro's short interest?
2.4M shares of Ambiq Micro were sold short, 10.66% of the float; at the average daily volume it would take 4.21 days to cover.
Are insiders buying or selling Ambiq Micro?
Of the latest 3 reported insider transactions in Ambiq Micro (since January 26, 2026), 0 were purchases and 3 were sales.
How many shares of Ambiq Micro are outstanding?
Ambiq Micro has 24.2M shares outstanding, of which 21.6M are in the public float.