Ambiq Micro (AMBQ)
Ambiq Micro on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE, classified by the SEC as semiconductors & related devices.
2.7M
Short interest
settlement 2026-10-15
5.7
Days to cover
+2.1 days vs prior
43.5%
Short share of volume
2026-11-02
26
Fails to deliver
settlement 2026-10-14
Thu 5 Nov
Next earnings
estimated date
-$22.1M
Insider flow, 90 days
0 buys, 63 sells
As of 2026-11-02.
Short interest
FINRA, twice a month. The newest 30 settlements in the table, 30 in the chart. JSONAs of 15 October 2026, short interest in AMBQ is 2,661,312 shares, up 550,498 shares over the last month. Over the last 30 readings it ranged from 140,937 shares (29 August 2025) to 2,661,312 shares (15 October 2026). The latest reading sits at the top of that range. At the reported average volume of 470K shares a day that is 5.7 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 2,661,312 | +9.0% | 469,879 | 5.66 |
| 2026-09-30 | 2,441,751 | +15.7% | 688,422 | 3.55 |
| 2026-09-15 | 2,110,814 | +16.6% | 448,668 | 4.70 |
| 2026-08-31 | 1,809,791 | +5.0% | 424,016 | 4.27 |
| 2026-08-14 | 1,723,765 | -2.2% | 433,607 | 3.98 |
| 2026-07-31 | 1,763,291 | -0.2% | 571,739 | 3.08 |
| 2026-07-15 | 1,766,758 | +0.1% | 511,830 | 3.45 |
| 2026-06-30 | 1,764,435 | +16.9% | 1,032,492 | 1.71 |
| 2026-06-15 | 1,509,979 | +30.7% | 589,090 | 2.56 |
| 2026-05-29 | 1,155,319 | +18.1% | 856,358 | 1.35 |
| 2026-05-15 | 978,024 | -5.5% | 990,416 | 1.00 |
| 2026-04-30 | 1,034,463 | -12.3% | 322,972 | 3.20 |
| 2026-04-15 | 1,179,154 | -1.1% | 287,682 | 4.10 |
| 2026-03-31 | 1,192,495 | +248.9% | 445,756 | 2.68 |
| 2026-03-13 | 341,783 | +125.4% | 464,257 | 1.00 |
| 2026-02-27 | 151,605 | -38.4% | 257,195 | 1.00 |
| 2026-02-13 | 245,936 | +5.2% | 258,395 | 1.00 |
| 2026-01-30 | 233,865 | -43.0% | 487,949 | 1.00 |
| 2026-01-15 | 410,670 | -13.1% | 117,387 | 3.50 |
| 2025-12-31 | 472,634 | +13.3% | 96,469 | 4.90 |
| 2025-12-15 | 417,352 | +5.6% | 79,914 | 5.22 |
| 2025-11-28 | 395,244 | +0.6% | 82,000 | 4.82 |
| 2025-11-14 | 393,034 | +16.4% | 115,561 | 3.40 |
| 2025-10-31 | 337,699 | -8.3% | 85,412 | 3.95 |
| 2025-10-15 | 368,124 | -40.3% | 167,765 | 2.19 |
| 2025-09-30 | 616,634 | +142.1% | 276,239 | 2.23 |
| 2025-09-15 | 254,736 | +80.7% | 244,069 | 1.04 |
| 2025-08-29 | 140,937 | -33.6% | 198,154 | 1.00 |
| 2025-08-15 | 212,170 | -1.8% | 418,940 | 1.00 |
| 2025-07-31 | 215,989 | +100.0% | 801,087 | 1.00 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 2 November 2026, the short share of AMBQ volume is 43.5%, down 25.1 points over the last five sessions. Over the last 30 readings it ranged from 42.7% (30 September 2026) to 86.3% (22 September 2026). The latest reading sits at the bottom of that range. The latest reading is 20.4 points below the 30-session average of 63.9%, on 209K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-02 | 91K | 209K | 43.5% | 5,293 |
| 2026-10-30 | 52K | 107K | 48.3% | 1,442 |
| 2026-10-29 | 39K | 56K | 69.2% | 74 |
| 2026-10-28 | 80K | 105K | 76.4% | 0 |
| 2026-10-27 | 60K | 96K | 63.2% | 0 |
| 2026-10-26 | 42K | 61K | 68.6% | 1,005 |
| 2026-10-23 | 67K | 126K | 53.2% | 0 |
| 2026-10-22 | 101K | 150K | 67.0% | 0 |
| 2026-10-21 | 165K | 218K | 75.5% | 243 |
| 2026-10-20 | 63K | 109K | 57.6% | 0 |
| 2026-10-19 | 87K | 168K | 51.9% | 0 |
| 2026-10-16 | 153K | 196K | 77.9% | 0 |
| 2026-10-15 | 154K | 241K | 64.0% | 3,874 |
| 2026-10-14 | 130K | 202K | 64.6% | 3,692 |
| 2026-10-13 | 106K | 167K | 63.4% | 0 |
| 2026-10-12 | 69K | 151K | 45.5% | 0 |
| 2026-10-09 | 70K | 113K | 61.7% | 0 |
| 2026-10-08 | 106K | 149K | 71.5% | 0 |
| 2026-10-07 | 121K | 189K | 63.8% | 0 |
| 2026-10-06 | 120K | 196K | 61.4% | 0 |
| 2026-10-05 | 86K | 129K | 66.8% | 0 |
| 2026-10-02 | 123K | 151K | 81.0% | 5,558 |
| 2026-10-01 | 109K | 180K | 60.7% | 0 |
| 2026-09-30 | 99K | 233K | 42.7% | 500 |
| 2026-09-29 | 128K | 242K | 52.8% | 7,242 |
| 2026-09-28 | 63K | 88K | 71.9% | 150 |
| 2026-09-25 | 69K | 103K | 66.4% | 0 |
| 2026-09-24 | 128K | 202K | 63.2% | 77 |
| 2026-09-23 | 114K | 150K | 76.5% | 702 |
| 2026-09-22 | 213K | 247K | 86.3% | 101 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 14 October 2026, the fails-to-deliver balance in AMBQ is 26 shares, down 741 shares over the last settlement date. Over the last 30 readings it ranged from 3 shares (10 April 2026) to 87,199 shares (23 March 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-14 | 26 | $55.86 | $1K |
| 2026-10-01 | 767 | $68.17 | $52K |
| 2026-09-29 | 3 | $68.30 | $205 |
| 2026-09-28 | 560 | $69.79 | $39K |
| 2026-09-17 | 56 | $59.90 | $3K |
| 2026-08-27 | 56 | $58.98 | $3K |
| 2026-08-24 | 5,206 | $59.02 | $307K |
| 2026-08-19 | 22 | $63.01 | $1K |
| 2026-08-17 | 40 | $64.51 | $3K |
| 2026-07-30 | 300 | $57.26 | $17K |
| 2026-07-27 | 123 | $70.28 | $9K |
| 2026-07-22 | 205 | $78.14 | $16K |
| 2026-07-21 | 7 | $73.37 | $514 |
| 2026-07-20 | 142 | $72.43 | $10K |
| 2026-07-15 | 291 | $85.48 | $25K |
| 2026-07-01 | 477 | $88.30 | $42K |
| 2026-06-29 | 465 | $80.15 | $37K |
| 2026-06-24 | 23,570 | $79.78 | $1.9M |
| 2026-06-18 | 7 | $79.12 | $554 |
| 2026-06-15 | 111 | $84.72 | $9K |
| 2026-06-04 | 360 | $82.80 | $30K |
| 2026-05-18 | 822 | $70.57 | $58K |
| 2026-04-23 | 5 | $35.44 | $177 |
| 2026-04-20 | 42 | $34.76 | $1K |
| 2026-04-10 | 3 | $28.82 | $86 |
| 2026-04-08 | 15,340 | $27.75 | $426K |
| 2026-04-01 | 29,728 | $25.41 | $755K |
| 2026-03-31 | 4,376 | $23.68 | $104K |
| 2026-03-25 | 3,710 | $25.39 | $94K |
| 2026-03-23 | 87,199 | $24.24 | $2.1M |
Insider trades
SEC Form 4, newest first. JSONInsiders at AMBQ reported 63 open-market sells worth $22.1M in the last 90 days and no open-market buys. Latest filing: Esaka Fumihide (Chief Executive Officer) on 2026-10-15.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-15 | Esaka Fumihide | Chief Executive Officer | Sell | 1K | $51.85 | $62K | 444K |
| 2026-10-15 | Esaka Fumihide | Chief Executive Officer | Sell | 3K | $51.15 | $143K | 445K |
| 2026-10-15 | Esaka Fumihide | Chief Executive Officer | Sell | 500 | $50.02 | $25K | 448K |
| 2026-10-15 | Esaka Fumihide | Chief Executive Officer | Sell | 500 | $49.13 | $25K | 448K |
| 2026-10-15 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 5K | $8.12 | $41K | 449K |
| 2026-10-15 | Hanson Scott McLean | Chief Technology Officer | Sell | 2K | $51.86 | $93K | 213K |
| 2026-10-15 | Hanson Scott McLean | Chief Technology Officer | Sell | 4K | $51.12 | $189K | 214K |
| 2026-10-15 | Hanson Scott McLean | Chief Technology Officer | Sell | 900 | $50.08 | $45K | 218K |
| 2026-10-15 | Hanson Scott McLean | Chief Technology Officer | Sell | 600 | $49.06 | $29K | 219K |
| 2026-10-15 | Hanson Scott McLean | Chief Technology Officer | Exercise or conversion | 7K | $8.12 | $57K | 220K |
| 2026-10-14 | Chen Sean Chihhsiang | President and COO | Sell | 200 | $54.27 | $11K | 106K |
| 2026-10-14 | Chen Sean Chihhsiang | President and COO | Sell | 4K | $53.44 | $214K | 106K |
| 2026-10-14 | Chen Sean Chihhsiang | President and COO | Sell | 2K | $52.47 | $105K | 110K |
| 2026-10-14 | Chen Sean Chihhsiang | President and COO | Sell | 1K | $51.53 | $65K | 112K |
| 2026-10-14 | Chen Sean Chihhsiang | President and COO | Sell | 8K | $50.13 | $378K | 114K |
| 2026-10-14 | Chen Sean Chihhsiang | President and COO | Exercise or conversion | 15K | $8.12 | $122K | 121K |
| 2026-10-05 | Chen Sean Chihhsiang | President and COO | Sell | 100 | $69.51 | $7K | 106K |
| 2026-10-05 | Chen Sean Chihhsiang | President and COO | Sell | 800 | $68.08 | $54K | 106K |
| 2026-10-05 | Chen Sean Chihhsiang | President and COO | Sell | 2K | $67.29 | $121K | 107K |
| 2026-10-05 | Chen Sean Chihhsiang | President and COO | Sell | 6K | $66.38 | $366K | 109K |
| 2026-10-02 | Winzeler Jeffrey G | Chief Financial Officer | Sell | 284 | $71.86 | $20K | 101K |
| 2026-10-02 | Winzeler Jeffrey G | Chief Financial Officer | Sell | 3K | $69.77 | $197K | 101K |
| 2026-10-02 | Winzeler Jeffrey G | Chief Financial Officer | Sell | 2K | $69.11 | $162K | 104K |
| 2026-10-02 | Chen Sean Chihhsiang | President and COO | Sell | 302 | $71.86 | $22K | 114K |
| 2026-10-02 | Chen Sean Chihhsiang | President and COO | Sell | 3K | $69.77 | $210K | 115K |
| 2026-10-02 | Chen Sean Chihhsiang | President and COO | Sell | 2K | $69.11 | $172K | 118K |
| 2026-10-02 | Hanson Scott McLean | Chief Technology Officer | Sell | 452 | $71.86 | $32K | 213K |
| 2026-10-02 | Hanson Scott McLean | Chief Technology Officer | Sell | 5K | $69.77 | $314K | 213K |
| 2026-10-02 | Hanson Scott McLean | Chief Technology Officer | Sell | 4K | $69.11 | $258K | 217K |
| 2026-10-02 | Esaka Fumihide | Chief Executive Officer | Sell | 862 | $71.86 | $62K | 444K |
| 2026-10-02 | Esaka Fumihide | Chief Executive Officer | Sell | 9K | $69.77 | $599K | 445K |
| 2026-10-02 | Esaka Fumihide | Chief Executive Officer | Sell | 7K | $69.11 | $492K | 453K |
| 2026-09-15 | Hanson Scott McLean | Chief Technology Officer | Sell | 100 | $61.00 | $6K | 221K |
| 2026-09-15 | Hanson Scott McLean | Chief Technology Officer | Sell | 5K | $60.56 | $300K | 221K |
| 2026-09-15 | Hanson Scott McLean | Chief Technology Officer | Sell | 2K | $59.53 | $116K | 226K |
| 2026-09-15 | Hanson Scott McLean | Chief Technology Officer | Exercise or conversion | 7K | $8.12 | $57K | 228K |
| 2026-09-15 | Esaka Fumihide | Chief Executive Officer | Sell | 100 | $61.00 | $6K | 460K |
| 2026-09-15 | Esaka Fumihide | Chief Executive Officer | Sell | 10K | $60.55 | $582K | 461K |
| 2026-09-15 | Esaka Fumihide | Chief Executive Officer | Sell | 4K | $59.56 | $225K | 470K |
| 2026-09-15 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 14K | $8.12 | $110K | 474K |
| 2026-09-14 | Chen Sean Chihhsiang | President and COO | Sell | 1K | $60.83 | $85K | 120K |
| 2026-09-14 | Chen Sean Chihhsiang | President and COO | Sell | 11K | $60.24 | $663K | 122K |
| 2026-09-14 | Chen Sean Chihhsiang | President and COO | Sell | 3K | $59.36 | $154K | 133K |
| 2026-09-14 | Chen Sean Chihhsiang | President and COO | Exercise or conversion | 15K | $8.12 | $122K | 135K |
| 2026-09-11 | Esaka Fumihide | Chief Executive Officer | Sell | 8K | $63.86 | $506K | 460K |
| 2026-09-11 | Esaka Fumihide | Chief Executive Officer | Sell | 42K | $63.27 | $2.7M | 468K |
| 2026-09-11 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 50K | $12.60 | $630K | 510K |
| 2026-09-11 | ZHANG KER | Director | Sell | 900 | $63.95 | $58K | 20K |
| 2026-09-11 | ZHANG KER | Director | Sell | 9K | $63.39 | $577K | 21K |
| 2026-09-04 | Chen Sean Chihhsiang | President and COO | Sell | 2K | $57.68 | $123K | 120K |
| 2026-09-04 | Chen Sean Chihhsiang | President and COO | Sell | 13K | $57.09 | $735K | 122K |
| 2026-09-04 | Chen Sean Chihhsiang | President and COO | Exercise or conversion | 15K | $8.12 | $122K | 135K |
| 2026-09-04 | ZHANG KER | Director | Sell | 185 | $56.92 | $11K | 30K |
| 2026-09-04 | ZHANG KER | Director | Exercise or conversion | 2K | $5.88 | $10K | 31K |
| 2026-09-02 | Esaka Fumihide | Chief Executive Officer | Sell | 10K | $56.77 | $544K | 460K |
| 2026-09-02 | Esaka Fumihide | Chief Executive Officer | Sell | 1K | $56.15 | $82K | 470K |
| 2026-09-02 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 11K | $12.60 | $139K | 471K |
| 2026-09-01 | Esaka Fumihide | Chief Executive Officer | Sell | 49K | $56.39 | $2.8M | 460K |
| 2026-09-01 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 49K | $12.60 | $617K | 509K |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Sell | 6K | $58.46 | $327K | 460K |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Sell | 14K | $57.70 | $796K | 466K |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Sell | 16K | $56.81 | $886K | 480K |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 44K | $12.60 | $558K | 495K |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Sell | 2K | $58.52 | $123K | 451K |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Sell | 6K | $57.75 | $318K | 453K |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Sell | 6K | $56.87 | $335K | 459K |
| 2026-08-31 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 14K | $8.12 | $110K | 465K |
| 2026-08-27 | Hanson Scott McLean | Chief Technology Officer | Sell | 5K | $60.32 | $296K | 221K |
| 2026-08-27 | Hanson Scott McLean | Chief Technology Officer | Sell | 23K | $59.69 | $1.3M | 226K |
| 2026-08-27 | Hanson Scott McLean | Chief Technology Officer | Exercise or conversion | 28K | $8.12 | $223K | 249K |
| 2026-08-26 | Hanson Scott McLean | Chief Technology Officer | Sell | 28K | $59.58 | $1.6M | 221K |
| 2026-08-26 | Hanson Scott McLean | Chief Technology Officer | Exercise or conversion | 28K | $8.12 | $223K | 249K |
| 2026-08-26 | Hanson Scott McLean | Chief Technology Officer | Exercise or conversion | 10K | $8.12 | $81K | 221K |
| 2026-08-14 | Hanson Scott McLean | Chief Technology Officer | Sell | 800 | $65.30 | $52K | 211K |
| 2026-08-14 | Esaka Fumihide | Chief Executive Officer | Sell | 2K | $65.26 | $98K | 451K |
| 2026-08-14 | Esaka Fumihide | Chief Executive Officer | Sell | 11K | $64.40 | $690K | 453K |
| 2026-08-14 | Esaka Fumihide | Chief Executive Officer | Sell | 1K | $63.29 | $81K | 463K |
| 2026-08-14 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 14K | $8.12 | $110K | 465K |
| 2026-08-14 | Hanson Scott McLean | Chief Technology Officer | Sell | 5K | $64.41 | $348K | 212K |
| 2026-08-14 | Hanson Scott McLean | Chief Technology Officer | Sell | 800 | $63.26 | $51K | 217K |
| 2026-08-14 | Hanson Scott McLean | Chief Technology Officer | Exercise or conversion | 7K | $8.12 | $57K | 218K |
| 2026-06-08 | Banks Bernard Bennett | Director | Grant | 5K | $0.00 | $0 | 5K |
| 2026-06-08 | HSIEH Wen Hsuan | Director | Grant | 5K | $0.00 | $0 | 5K |
| 2026-06-08 | Chen Timothy | Director | Grant | 5K | $0.00 | $0 | 53K |
| 2026-06-08 | TAUTGES JOSEPH A | Director | Grant | 5K | $0.00 | $0 | 54K |
| 2026-06-08 | ZHANG KER | Director | Grant | 5K | $0.00 | $0 | 29K |
| 2026-06-02 | Winzeler Jeffrey G | Chief Financial Officer | Exercise or conversion | 6K | $16.80 | $100K | 106K |
| 2026-05-27 | Chen Timothy | Director | Sell | 3K | $81.57 | $266K | 0 |
| 2026-05-27 | Chen Timothy | Director | Sell | 21K | $80.61 | $1.7M | 3K |
| 2026-05-27 | Chen Timothy | Director | Sell | 24K | $79.72 | $1.9M | 24K |
| 2026-05-27 | Chen Timothy | Director | Sell | 22K | $78.85 | $1.8M | 48K |
| 2026-05-15 | Chen Sean Chihhsiang | President and COO | Sell | 23K | $71.37 | $1.7M | 120K |
| 2026-05-15 | Chen Sean Chihhsiang | President and COO | Sell | 32K | $70.53 | $2.3M | 144K |
| 2026-05-15 | Chen Sean Chihhsiang | President and COO | Exercise or conversion | 56K | $5.88 | $327K | 176K |
| 2026-05-15 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 15K | $12.60 | $183K | 451K |
| 2026-05-15 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 45K | $8.12 | $369K | 437K |
| 2026-05-15 | Hanson Scott McLean | Chief Technology Officer | Exercise or conversion | 8K | $8.12 | $66K | 211K |
| 2026-05-15 | Winzeler Jeffrey G | Chief Financial Officer | Exercise or conversion | 6K | $16.80 | $100K | 100K |
| 2026-05-14 | Esaka Fumihide | Chief Executive Officer | Sell | 60K | $70.02 | $4.2M | 391K |
| 2026-05-14 | Esaka Fumihide | Chief Executive Officer | Exercise or conversion | 60K | $8.12 | $487K | 451K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON21 Form 144 notices on file for AMBQ worth $40.9M at the prices reported; 16 in the last 90 days worth $24.6M. Latest: SEAN CHEN filed on 2026-10-05 to sell 53,205 shares ($3.6M) from 2026-10-05.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-10-05 | SEAN CHENOfficer | 53K | $3.6M | 0.220% | 2026-10-05 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-10-02 | Sean Chihhsiang ChenOfficer | 6K | $401K | 0.024% | 2026-10-02 | Morgan Stanley Smith Barney LLC |
| 2026-10-02 | Fumihide EsakaOfficer, Director | 17K | $1.1M | 0.068% | 2026-10-02 | Morgan Stanley Smith Barney LLC |
| 2026-10-02 | Scott McLean HansonOfficer, Director | 9K | $600K | 0.035% | 2026-10-02 | Morgan Stanley Smith Barney LLC |
| 2026-10-02 | Jeffrey G. WinzelerOfficer | 5K | $377K | 0.022% | 2026-10-02 | Morgan Stanley Smith Barney LLC |
| 2026-09-11 | KER ZHANGDirector | 10K | $634K | 0.041% | 2026-09-11 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-11 | FUMIHIDE ESAKAOfficer, Director | 50K | $3.2M | 0.207% | 2026-09-11 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-04 | SEAN CHENOfficer | 30K | $1.7M | 0.124% | 2026-09-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-04 | KER ZHANGDirector | 185 | $11K | 0.001% | 2026-09-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-02 | FUMIHIDE (HUMI) ESAKAOfficer, Director | 11K | $625K | 0.046% | 2026-09-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-01 | FUMIHIDE (HUMI) ESAKAOfficer, Director | 49K | $2.8M | 0.202% | 2026-09-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-31 | FUMIHIDE (HUMI) ESAKAOfficer, Director | 35K | $2.0M | 0.145% | 2026-08-31 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-27 | SCOTT HANSONOfficer | 28K | $1.6M | 0.114% | 2026-08-27 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-26 | SCOTT HANSONOfficer | 28K | $1.6M | 0.114% | 2026-08-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-14 | SCOTT HANSONDirector, Officer | 21K | $1.4M | 0.087% | 2026-08-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-14 | FUMIHIDE ESAKADirector, Officer | 46K | $2.9M | 0.188% | 2026-08-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-27 | Triumph Way Investment IncDirector | 71K | $5.6M | 0.330% | 2026-05-27 | UBS Financial Services Inc |
| 2026-05-15 | SEAN CHENOfficer | 56K | $3.9M | 0.261% | 2026-05-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-14 | JEFF G WINZELEROfficer | 26K | $1.8M | 0.122% | 2026-05-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-14 | SCOTT HANSONOfficer | 10K | $706K | 0.048% | 2026-05-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-14 | FUMIHIDE ESAKAOfficer | 60K | $4.2M | 0.281% | 2026-05-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON3 holders report 5% or more of AMBQ in their latest filing, all on Schedule 13G (passive). The largest reported stake is KPCB XVI Associates, LLC at 8.2% of the class (1,488,949 shares), filed 2025-11-03 for an event on 2025-09-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-10-27 | 13G/Ano. 1 | BlackRock, Inc.parent holding company | 1.6M | 6.7% | 2026-09-30 |
| 2026-08-14 | 13G/Ano. 1 | T. Rowe Price Investment Management, Inc.investment adviser | 1.0M | 4.3% | 2026-06-30 |
| 2025-11-03 | 13G | KPCB XVI Associates, LLCother entity | 1.5M | 8.2% | 2025-09-30 |
| 2025-11-03 | 13G | Kleiner Perkins Caufield & Byers XVI, LLCother entity | 1.4M | 7.9% | 2025-09-30 |
| 2025-11-03 | 13G | Kleiner Perkins Select Associates, LLCother entity | 593K | 3.3% | 2025-09-30 |
| 2025-11-03 | 13G | Kleiner Perkins Select Fund, LLCother entity | 576K | 3.2% | 2025-09-30 |
| 2025-11-03 | 13G | KPCB XVI Founders Fund, LLCother entity | 49K | 0.3% | 2025-09-30 |
| 2025-11-03 | 13G | Kleiner Perkins Select Founders Fund, LLCother entity | 17K | 0.1% | 2025-09-30 |
13F holders
Tracked managers holding AMBQ at their latest 13F. JSON7 of the 30 tracked managers held AMBQ at their latest 13F, $207.2M in total at quarter-end prices. D. E. Shaw & Co. is the largest at $86.9M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 7 added shares and 0 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| D. E. Shaw & Co. | 2026-06-30 | 984K | $86.9M | 0.04% | new |
| Two Sigma Investments | 2026-06-30 | 652K | $57.6M | 0.04% | +615K |
| Millennium Management | 2026-06-30 | 289K | $25.5M | 0.01% | +112K |
| Renaissance Technologies | 2026-06-30 | 215K | $19.0M | 0.03% | +172K |
| Citadel Advisors | 2026-06-30 | 122K | $10.8M | 0.00% | new |
| Point72 Asset Management | 2026-06-30 | 77K | $6.8M | 0.01% | new |
| AQR Capital Management | 2026-06-30 | 7K | $599K | 0.00% | new |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
What this page is
Ambiq Micro in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Ambiq Micro (AMBQ), SEC CIK 1500412, listed on NYSE, classified by the SEC as semiconductors & related devices. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-14.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-10-05.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-10-27.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-11.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-15.JSON and CSV
- Company record
- EDGAR filing index for CIK 1500412Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of AMBQ is sold short?
2,661,312 shares were held short at the 2026-10-15 settlement, 5.7 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is AMBQ's daily short volume?
On 2026-11-02, 90,871 of the 208,812 AMBQ shares reported to FINRA were sold short, 43.5% of the day's reported volume. Short volume is a flow for one day, not a position.
Does AMBQ have fails to deliver?
The SEC's latest file shows 26 AMBQ shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.
Are AMBQ insiders buying or selling?
Insiders at AMBQ reported 63 open-market sells worth $22.1M in the last 90 days and no open-market buys. Latest filing: Esaka Fumihide (Chief Executive Officer) on 2026-10-15.
Have AMBQ insiders filed to sell?
21 Form 144 notices on file for AMBQ worth $40.9M at the prices reported; 16 in the last 90 days worth $24.6M. Latest: SEAN CHEN filed on 2026-10-05 to sell 53,205 shares ($3.6M) from 2026-10-05.
Who owns 5% or more of AMBQ?
3 holders report 5% or more of AMBQ in their latest filing, all on Schedule 13G (passive). The largest reported stake is KPCB XVI Associates, LLC at 8.2% of the class (1,488,949 shares), filed 2025-11-03 for an event on 2025-09-30.
Which tracked 13F managers own AMBQ?
7 of the 30 tracked 13F managers held AMBQ shares at their latest filing, $207.2M in all. The largest: D. E. Shaw & Co. (984K shares, $86.9M), Two Sigma Investments (652K shares, $57.6M), Izzy Englander's Millennium Management (289K shares, $25.5M), Renaissance Technologies (215K shares, $19.0M), Ken Griffin's Citadel Advisors (122K shares, $10.8M), Steve Cohen's Point72 Asset Management (77K shares, $6.8M). The table above lists all 7.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.