Ambarella (AMBA)
Ambarella on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as semiconductors & related devices.
4.7M
Short interest
settlement 2026-10-15
4.3
Days to cover
+0.8 days vs prior
52.9%
Short share of volume
2026-11-02
3
Fails to deliver
settlement 2026-10-02
Tue 24 Nov
Next earnings
estimated date
-$1.1M
Insider flow, 90 days
0 buys, 6 sells
As of 2026-11-02.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 15 October 2026, short interest in AMBA is 4,719,646 shares, down 987,651 shares over the last month. Over the last 48 readings it ranged from 1,290,536 shares (15 May 2025) to 5,707,297 shares (15 September 2026). At the reported average volume of 1.1M shares a day that is 4.3 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/amba" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 4,719,646 | -8.4% | 1,092,930 | 4.32 |
| 2026-09-30 | 5,153,912 | -9.7% | 1,464,558 | 3.52 |
| 2026-09-15 | 5,707,297 | +30.8% | 2,539,354 | 2.25 |
| 2026-08-31 | 4,364,091 | +7.2% | 943,123 | 4.63 |
| 2026-08-14 | 4,070,707 | -21.0% | 1,191,221 | 3.42 |
| 2026-07-31 | 5,154,890 | +30.6% | 2,381,629 | 2.16 |
| 2026-07-15 | 3,945,513 | +19.7% | 1,738,013 | 2.27 |
| 2026-06-30 | 3,295,313 | +14.8% | 1,838,073 | 1.79 |
| 2026-06-15 | 2,870,254 | +29.5% | 1,632,892 | 1.76 |
| 2026-05-29 | 2,217,006 | -7.9% | 2,015,840 | 1.10 |
| 2026-05-15 | 2,407,645 | -8.3% | 968,524 | 2.49 |
| 2026-04-30 | 2,626,588 | +2.7% | 744,306 | 3.53 |
| 2026-04-15 | 2,556,508 | +21.9% | 689,661 | 3.71 |
| 2026-03-31 | 2,096,416 | -6.4% | 835,976 | 2.51 |
| 2026-03-13 | 2,239,523 | +13.0% | 842,872 | 2.66 |
| 2026-02-27 | 1,981,727 | -2.0% | 1,079,305 | 1.84 |
| 2026-02-13 | 2,022,069 | -11.1% | 716,298 | 2.82 |
| 2026-01-30 | 2,273,200 | -2.4% | 720,281 | 3.16 |
| 2026-01-15 | 2,328,921 | +5.7% | 1,429,272 | 1.63 |
| 2025-12-31 | 2,203,545 | -7.6% | 582,325 | 3.78 |
| 2025-12-15 | 2,384,764 | -14.4% | 1,017,179 | 2.34 |
| 2025-11-28 | 2,786,696 | +44.4% | 1,361,727 | 2.05 |
| 2025-11-14 | 1,929,881 | +12.9% | 781,829 | 2.47 |
| 2025-10-31 | 1,708,633 | -7.2% | 379,523 | 4.50 |
| 2025-10-15 | 1,841,712 | -8.0% | 577,763 | 3.19 |
| 2025-09-30 | 2,001,694 | +1.5% | 836,358 | 2.39 |
| 2025-09-15 | 1,971,780 | -4.8% | 833,012 | 2.37 |
| 2025-08-29 | 2,071,750 | -6.1% | 1,380,633 | 1.50 |
| 2025-08-15 | 2,206,864 | +1.6% | 484,048 | 4.56 |
| 2025-07-31 | 2,171,994 | +4.8% | 543,212 | 4.00 |
| 2025-07-15 | 2,071,792 | -3.7% | 633,650 | 3.27 |
| 2025-06-30 | 2,151,568 | +39.8% | 1,646,449 | 1.31 |
| 2025-06-13 | 1,539,067 | +4.3% | 985,065 | 1.56 |
| 2025-05-30 | 1,475,387 | +14.3% | 1,130,686 | 1.30 |
| 2025-05-15 | 1,290,536 | -4.8% | 555,197 | 2.32 |
| 2025-04-30 | 1,356,125 | +0.6% | 712,011 | 1.90 |
| 2025-04-15 | 1,347,447 | -17.5% | 837,009 | 1.61 |
| 2025-03-31 | 1,634,010 | +18.9% | 609,121 | 2.68 |
| 2025-03-14 | 1,374,201 | -29.4% | 1,208,260 | 1.14 |
| 2025-02-28 | 1,946,995 | +3.3% | 1,427,635 | 1.36 |
| 2025-02-14 | 1,884,879 | +21.3% | 476,040 | 3.96 |
| 2025-01-31 | 1,553,503 | +4.3% | 650,954 | 2.39 |
| 2025-01-15 | 1,488,877 | +6.0% | 771,583 | 1.93 |
| 2024-12-31 | 1,405,092 | -1.9% | 542,486 | 2.59 |
| 2024-12-13 | 1,432,746 | -6.7% | 742,467 | 1.93 |
| 2024-11-29 | 1,535,563 | +7.7% | 1,234,789 | 1.24 |
| 2024-11-15 | 1,425,341 | +6.0% | 340,165 | 4.19 |
| 2024-10-31 | 1,345,306 | -2.0% | 277,904 | 4.84 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 2 November 2026, the short share of AMBA volume is 52.9%, down 3.1 points over the last five sessions. Over the last 30 readings it ranged from 24.3% (28 October 2026) to 74.0% (13 October 2026). The latest reading is 3.5 points below the 30-session average of 56.4%, on 415K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-02 | 219K | 415K | 52.9% | 925 |
| 2026-10-30 | 894K | 1.4M | 63.0% | 468 |
| 2026-10-29 | 193K | 454K | 42.5% | 175 |
| 2026-10-28 | 283K | 1.2M | 24.3% | 628 |
| 2026-10-27 | 171K | 597K | 28.6% | 2 |
| 2026-10-26 | 260K | 464K | 56.0% | 33 |
| 2026-10-23 | 341K | 587K | 58.2% | 0 |
| 2026-10-22 | 283K | 461K | 61.3% | 263 |
| 2026-10-21 | 1.0M | 1.6M | 65.8% | 84 |
| 2026-10-20 | 192K | 282K | 68.2% | 437 |
| 2026-10-19 | 537K | 1.2M | 45.8% | 0 |
| 2026-10-16 | 608K | 853K | 71.3% | 526 |
| 2026-10-15 | 336K | 513K | 65.6% | 1,201 |
| 2026-10-14 | 350K | 550K | 63.7% | 1,202 |
| 2026-10-13 | 260K | 352K | 74.0% | 0 |
| 2026-10-12 | 254K | 360K | 70.5% | 700 |
| 2026-10-09 | 513K | 814K | 63.0% | 251 |
| 2026-10-08 | 291K | 538K | 54.1% | 60 |
| 2026-10-07 | 204K | 298K | 68.4% | 307 |
| 2026-10-06 | 188K | 358K | 52.4% | 0 |
| 2026-10-05 | 213K | 411K | 51.9% | 316 |
| 2026-10-02 | 274K | 470K | 58.4% | 1,003 |
| 2026-10-01 | 140K | 230K | 61.0% | 0 |
| 2026-09-30 | 208K | 330K | 63.1% | 15 |
| 2026-09-29 | 184K | 307K | 60.1% | 102 |
| 2026-09-28 | 234K | 474K | 49.4% | 40 |
| 2026-09-25 | 465K | 861K | 53.9% | 0 |
| 2026-09-24 | 490K | 818K | 59.8% | 721 |
| 2026-09-23 | 871K | 1.6M | 53.8% | 333 |
| 2026-09-22 | 107K | 352K | 30.5% | 64 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 2 October 2026, the fails-to-deliver balance in AMBA is 3 shares, down 8,410 shares over the last settlement date. Over the last 30 readings it ranged from 3 shares (2 October 2026) to 165,000 shares (18 September 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-02 | 3 | $70.30 | $211 |
| 2026-09-29 | 8,413 | $68.68 | $578K |
| 2026-09-24 | 7,575 | $67.62 | $512K |
| 2026-09-18 | 165,000 | $66.91 | $11.0M |
| 2026-09-04 | 230 | $63.38 | $15K |
| 2026-09-03 | 1,794 | $67.14 | $120K |
| 2026-08-24 | 100 | $73.73 | $7K |
| 2026-08-14 | 350 | $81.96 | $29K |
| 2026-08-11 | 20 | $82.04 | $2K |
| 2026-08-10 | 3,344 | $86.78 | $290K |
| 2026-08-06 | 743 | $81.85 | $61K |
| 2026-08-05 | 250 | $82.23 | $21K |
| 2026-08-04 | 61 | $82.68 | $5K |
| 2026-07-29 | 7,934 | $68.97 | $547K |
| 2026-07-28 | 8 | $68.23 | $546 |
| 2026-07-24 | 3,474 | $70.51 | $245K |
| 2026-07-17 | 135 | $63.29 | $9K |
| 2026-07-15 | 3,011 | $72.90 | $220K |
| 2026-07-10 | 326 | $78.38 | $26K |
| 2026-07-07 | 268 | $79.73 | $21K |
| 2026-07-06 | 10,200 | $78.36 | $799K |
| 2026-06-30 | 2,465 | $67.01 | $165K |
| 2026-06-24 | 160 | $65.51 | $10K |
| 2026-06-23 | 2,105 | $70.71 | $149K |
| 2026-06-22 | 2,958 | $69.97 | $207K |
| 2026-06-18 | 1,245 | $65.88 | $82K |
| 2026-06-17 | 851 | $67.12 | $57K |
| 2026-06-15 | 4 | $67.78 | $271 |
| 2026-06-08 | 110 | $63.52 | $7K |
| 2026-06-05 | 16,507 | $72.05 | $1.2M |
Insider trades
SEC Form 4, newest first. JSONInsiders at AMBA reported 6 open-market sells worth $1.1M in the last 90 days and no open-market buys. Latest filing: PAISLEY CHRISTOPHER B (Director) on 2026-09-25.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-25 | PAISLEY CHRISTOPHER B | Director | Sell | 250 | $70.76 | $18K | 44K |
| 2026-09-18 | Young John Alexander | CFO | Sell | 2K | $67.28 | $128K | 108K |
| 2026-09-17 | Young John Alexander | CFO | Sell | 3K | $64.83 | $203K | 110K |
| 2026-09-17 | Lee Chan W | Chief Operations Officer | Sell | 3K | $64.83 | $188K | 154K |
| 2026-09-17 | Ju Chi-Hong | Senior VP, Systems & GM | Sell | 2K | $64.83 | $130K | 154K |
| 2026-09-17 | Wang Feng-Ming | CEO | Sell | 6K | $64.83 | $395K | 768K |
| 2026-09-08 | Hu Chenming | Director | Grant | 3K | $0.00 | $0 | 33K |
| 2026-09-08 | Bryant Gregory M | Director | Grant | 3K | $0.00 | $0 | 6K |
| 2026-09-08 | Breithaupt Chantelle Yvette | Director | Grant | 3K | $0.00 | $0 | 8K |
| 2026-09-08 | Schwarting Elizabeth M | Director | Grant | 3K | $0.00 | $0 | 10K |
| 2026-09-08 | Hon Hsiao-Wuen | Director | Grant | 3K | $0.00 | $0 | 34K |
| 2026-09-08 | RICHARDSON DAVID JEFFREY | Director | Grant | 3K | $0.00 | $0 | 6K |
| 2026-09-08 | PAISLEY CHRISTOPHER B | Director | Grant | 3K | $0.00 | $0 | 44K |
| 2026-07-09 | Chen Yun-Lung | VP, Business Dev. & Marketing | Sell | 6K | $78.66 | $469K | 61K |
| 2026-07-01 | Ju Chi-Hong | Senior VP, Systems & GM | Sell | 10K | $88.84 | $888K | 156K |
| 2026-07-01 | Wang Feng-Ming | CEO | Sell | 16K | $90.08 | $1.5M | 774K |
| 2026-06-26 | PAISLEY CHRISTOPHER B | Director | Sell | 250 | $62.01 | $16K | 41K |
| 2026-06-17 | Young John Alexander | CFO | Sell | 2K | $66.98 | $124K | 113K |
| 2026-06-17 | Young John Alexander | CFO | Sell | 3K | $67.87 | $216K | 114K |
| 2026-06-17 | Lee Chan W | Chief Operations Officer | Sell | 3K | $67.87 | $200K | 157K |
| 2026-06-17 | Ju Chi-Hong | Senior VP, Systems & GM | Sell | 2K | $67.87 | $137K | 166K |
| 2026-06-17 | Wang Feng-Ming | CEO | Gift | 10K | $0.00 | $0 | 790K |
| 2026-06-17 | Wang Feng-Ming | CEO | Sell | 6K | $67.87 | $421K | 800K |
| 2026-06-12 | Chen Yun-Lung | VP, Business Development and | Sell | 10K | $67.06 | $661K | 67K |
| 2026-05-26 | Young John Alexander | CFO | Sell | 400 | $96.00 | $38K | 118K |
| 2026-05-26 | Young John Alexander | CFO | Exercise or conversion | 400 | $55.80 | $22K | 118K |
| 2026-05-26 | Wang Feng-Ming | CEO | Sell | 9K | $92.05 | $842K | 806K |
| 2026-05-26 | Wang Feng-Ming | CEO | Sell | 6K | $91.23 | $553K | 815K |
| 2026-05-26 | Wang Feng-Ming | CEO | Sell | 17K | $90.38 | $1.6M | 821K |
| 2026-04-21 | Young John Alexander | CFO | Sell | 2K | $60.00 | $118K | 118K |
| 2026-03-19 | Wang Feng-Ming | CEO | Sell | 8K | $54.14 | $438K | 839K |
| 2026-03-19 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Sell | 2K | $54.14 | $117K | 168K |
| 2026-03-19 | Lee Chan W | Chief Operations Officer | Sell | 4K | $54.14 | $197K | 160K |
| 2026-03-19 | Young John Alexander | CFO | Sell | 3K | $54.14 | $164K | 120K |
| 2026-03-18 | Wang Feng-Ming | CEO | Grant | 16K | $0.00 | $0 | 847K |
| 2026-03-18 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Grant | 6K | $0.00 | $0 | 170K |
| 2026-03-18 | Lee Chan W | Chief Operations Officer | Grant | 7K | $0.00 | $0 | 164K |
| 2026-03-18 | Chen Yun-Lung | VP, Business Development and M | Grant | 3K | $0.00 | $0 | 76K |
| 2026-03-18 | Young John Alexander | CFO | Grant | 6K | $0.00 | $0 | 123K |
| 2026-03-17 | Wang Feng-Ming | CEO | Sell | 19K | $52.77 | $1.0M | 831K |
| 2026-03-17 | Wang Feng-Ming | CEO | Exercise or conversion | 28K | price not stated in the filing | not stated | 850K |
| 2026-03-17 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Sell | 5K | $52.77 | $250K | 164K |
| 2026-03-17 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Exercise or conversion | 10K | price not stated in the filing | not stated | 169K |
| 2026-03-17 | Lee Chan W | Chief Operations Officer | Sell | 7K | $52.77 | $355K | 156K |
| 2026-03-17 | Lee Chan W | Chief Operations Officer | Exercise or conversion | 14K | price not stated in the filing | not stated | 163K |
| 2026-03-17 | Chen Yun-Lung | VP, Business Development and M | Exercise or conversion | 5K | price not stated in the filing | not stated | 74K |
| 2026-03-17 | Young John Alexander | CFO | Sell | 5K | $52.77 | $242K | 117K |
| 2026-03-17 | Young John Alexander | CFO | Exercise or conversion | 4K | price not stated in the filing | not stated | 122K |
| 2026-03-02 | Young John Alexander | CFO | Grant | 15K | $0.00 | $0 | 118K |
| 2026-03-02 | Chen Yun-Lung | VP, Business Development and M | Grant | 7K | $0.00 | $0 | 69K |
| 2026-03-02 | Lee Chan W | Chief Operations Officer | Grant | 25K | $0.00 | $0 | 149K |
| 2026-03-02 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Grant | 17K | $0.00 | $0 | 159K |
| 2026-03-02 | Wang Feng-Ming | CEO | Grant | 53K | $0.00 | $0 | 822K |
| 2026-03-02 | Wang Feng-Ming | CEO | Sell | 12K | $61.42 | $740K | 769K |
| 2026-03-02 | Wang Feng-Ming | CEO | Sell | 32K | $60.91 | $2.0M | 781K |
| 2026-03-02 | Wang Feng-Ming | CEO | Sell | 3K | $59.53 | $155K | 813K |
| 2026-03-02 | Wang Feng-Ming | CEO | Sell | 2K | $58.77 | $112K | 816K |
| 2026-03-02 | Wang Feng-Ming | CEO | Sell | 1K | $56.83 | $57K | 818K |
| 2026-03-02 | Wang Feng-Ming | CEO | Exercise or conversion | 50K | $41.36 | $2.1M | 819K |
| 2026-03-02 | Bryant Gregory M | Director | Grant | 2K | $0.00 | $0 | 2K |
| 2026-01-05 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Sell | 8K | $75.58 | $584K | 146K |
| 2025-12-30 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Sell | 8K | $70.25 | $558K | 150K |
| 2025-12-30 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Sell | 4K | $70.32 | $265K | 154K |
| 2025-12-26 | PAISLEY CHRISTOPHER B | Director | Sell | 500 | $72.18 | $36K | 41K |
| 2025-12-19 | Wang Feng-Ming | CEO | Gift | 15K | $0.00 | $0 | 769K |
| 2025-12-18 | Young John Alexander | CFO | Sell | 4K | $72.96 | $277K | 103K |
| 2025-12-17 | Young John Alexander | CFO | Sell | 3K | $71.82 | $185K | 107K |
| 2025-12-17 | Lee Chan W | Chief Operations Officer | Sell | 2K | $71.82 | $173K | 125K |
| 2025-12-17 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Sell | 1K | $71.82 | $96K | 158K |
| 2025-12-17 | Wang Feng-Ming | CEO | Sell | 5K | $71.82 | $356K | 784K |
| 2025-12-16 | Schwarting Elizabeth M | Director | Sell | 624 | $72.38 | $45K | 7K |
| 2025-12-15 | RICHARDSON DAVID JEFFREY | Director | Gift | 3K | $0.00 | $0 | 26K |
| 2025-12-15 | RICHARDSON DAVID JEFFREY | Director | Gift | 3K | $0.00 | $0 | 2K |
| 2025-10-14 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Sell | 6K | $80.96 | $498K | 159K |
| 2025-10-13 | Ju Chi-Hong | Senior VP, Systems & GM, Asia | Sell | 5K | $81.29 | $411K | 165K |
| 2025-10-06 | Schwarting Elizabeth M | Director | Sell | 3K | $85.38 | $227K | 7K |
| 2025-09-17 | Young John Alexander | CFO | Sell | 3K | $79.43 | $204K | 109K |
| 2025-09-17 | Lee Chan W | Chief Operating Officer | Sell | 2K | $79.43 | $155K | 127K |
| 2025-09-17 | Kohn Leslie | Chief Technology Officer | Sell | 2K | $79.43 | $179K | 977K |
| 2025-09-17 | Ju Chi-Hong | Sr. Vice President, Systems | Sell | 1K | $79.43 | $93K | 170K |
| 2025-09-17 | Wang Feng-Ming | CEO | Sell | 5K | $79.43 | $391K | 789K |
| 2025-09-10 | Chen Yun-Lung | VP, Business Development | Sell | 8K | $84.42 | $717K | 62K |
| 2025-09-02 | Breithaupt Chantelle Yvette | Director | Grant | 2K | $0.00 | $0 | 5K |
| 2025-09-02 | Schwarting Elizabeth M | Director | Grant | 2K | $0.00 | $0 | 10K |
| 2025-09-02 | Hon Hsiao-Wuen | Director | Grant | 2K | $0.00 | $0 | 31K |
| 2025-09-02 | RICHARDSON DAVID JEFFREY | Director | Grant | 2K | $0.00 | $0 | 5K |
| 2025-09-02 | PAISLEY CHRISTOPHER B | Director | Grant | 2K | $0.00 | $0 | 42K |
| 2025-09-02 | Hu Chenming | Director | Grant | 2K | $0.00 | $0 | 30K |
| 2025-06-25 | PAISLEY CHRISTOPHER B | Director | Sell | 1K | $62.58 | $63K | 39K |
| 2025-06-17 | Young John Alexander | CFO | Sell | 2K | $52.26 | $127K | 111K |
| 2025-06-17 | Day Christopher | VP, Marketing | Sell | 342 | $52.26 | $18K | 15K |
| 2025-06-17 | Lee Chan W | Chief Operating Officer | Sell | 2K | $52.26 | $84K | 129K |
| 2025-06-17 | Kohn Leslie | Chief Technology Officer | Sell | 2K | $52.26 | $90K | 980K |
| 2025-06-17 | Ju Chi-Hong | Sr. Vice President, Systems | Sell | 1K | $52.26 | $58K | 171K |
| 2025-06-17 | Wang Feng-Ming | CEO | Sell | 5K | $52.26 | $244K | 794K |
| 2025-03-25 | PAISLEY CHRISTOPHER B | Director | Sell | 500 | $55.50 | $28K | 40K |
| 2025-03-18 | Wang Feng-Ming | CEO | Sell | 3K | $55.02 | $176K | 798K |
| 2025-03-18 | Ju Chi-Hong | Sr. Vice President, Systems | Sell | 1K | $55.02 | $57K | 172K |
| 2025-03-18 | Kohn Leslie | Chief Technology Officer | Sell | 2K | $55.02 | $87K | 981K |
| 2025-03-18 | Lee Chan W | Chief Operating Officer | Sell | 1K | $55.02 | $81K | 130K |
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. JSON24 Form 144 notices on file for AMBA worth $23.3M at the prices reported; 2 in the last 90 days worth $145K. Latest: PAISLEY CHRISTOPHER B filed on 2026-09-25 to sell 250 shares ($18K) from 2026-09-25.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-25 | PAISLEY CHRISTOPHER BDirector | 250 | $18K | 0.001% | 2026-09-25 | Fidelity Brokerage Services LLC |
| 2026-09-18 | JOHN YOUNGOfficer | 2K | $127K | 0.004% | 2026-09-18 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-07-09 | YUN-LUNG CHENOfficer | 6K | $469K | 0.014% | 2026-07-09 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-07-01 | CHIHONG JOHN JUOfficer | 10K | $888K | 0.023% | 2026-07-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-07-01 | FENG-MING WANGDirector, Officer | 16K | $1.4M | 0.037% | 2026-07-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-26 | PAISLEY CHRISTOPHER BDirector | 250 | $16K | 0.001% | 2026-06-26 | Fidelity Brokerage Services LLC |
| 2026-06-17 | JOHN YOUNGOfficer | 2K | $124K | 0.004% | 2026-06-17 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-12 | YUN-LUNG CHENOfficer | 10K | $661K | 0.022% | 2026-06-12 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-26 | FENG-MING WANGDirector, Officer | 33K | $2.8M | 0.074% | 2026-05-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-26 | JOHN YOUNGOfficer | 400 | $35K | 0.001% | 2026-05-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-21 | JOHN YOUNGOfficer | 2K | $117K | 0.005% | 2026-04-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-02 | FENG-MING WANGDirector, Officer | 50K | $3.0M | 0.116% | 2026-03-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-05 | CHIHONG JOHN JUOfficer | 8K | $584K | 0.018% | 2026-01-05 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-30 | CHIHONG JOHN JUOfficer | 8K | $558K | 0.018% | 2025-12-30 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-29 | PAISLEY CHRISTOPHER BDirector | 500 | $36K | 0.001% | 2025-12-26 | Fidelity Brokerage Services LLC |
| 2025-12-18 | JOHN A YOUNGOfficer | 4K | $277K | 0.009% | 2025-12-18 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-16 | ELIZABETH M SCHWARTINGDirector | 624 | $45K | 0.001% | 2025-12-16 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-02 | LESLIE KOHNOfficer | 150K | $10.7M | 0.351% | 2025-12-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-14 | CHIHONG JOHN JUOfficer | 6K | $498K | 0.014% | 2025-10-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-14 | CHIHONG JOHN JUOfficer | 5K | $411K | 0.012% | 2025-10-13 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-06 | ELIZABETH M SCHWARTINGDirector | 3K | $227K | 0.006% | 2025-10-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-09-22 | CHRISTOPHER DAYOfficer | 1K | $89K | 0.002% | 2025-09-22 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-09-19 | CHRISTOPHER DAYOfficer | 1K | $84K | 0.002% | 2025-09-19 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-09-18 | CHRISTOPHER DAYOfficer | 829 | $68K | 0.002% | 2025-09-18 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON4 holders report 5% or more of AMBA in their latest filing, all on Schedule 13G (passive). The largest reported stake is Vanguard Portfolio Management at 7.0% of the class (3,107,820 shares), filed 2026-10-30 for an event on 2026-09-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-10-30 | 13G/Ano. 1 | Vanguard Portfolio Managementinvestment adviser | 3.1M | 7.0% | 2026-09-30 |
| 2026-08-14 | 13G | T. Rowe Price Associates, Inc.investment adviser | 2.6M | 5.9% | 2026-06-30 |
| 2026-08-07 | 13G | STATE STREET CORPORATIONparent holding company | 2.6M | 5.8% | 2026-06-30 |
| 2026-07-31 | 13G | Vanguard Capital Managementinvestment adviser | 2.2M | 5.0% | 2026-06-30 |
| 2026-03-26 | 13G/Ano. 13 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding AMBA at their latest 13F. JSON6 of the 30 tracked managers held AMBA at their latest 13F, $110.3M in total at quarter-end prices. D. E. Shaw & Co. is the largest at $44.2M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 5 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| D. E. Shaw & Co. | 2026-06-30 | 515K | $44.2M | 0.02% | +270K |
| AQR Capital Management | 2026-06-30 | 496K | $42.5M | 0.01% | -232 |
| Point72 Asset Management | 2026-06-30 | 118K | $10.1M | 0.01% | -403K |
| Renaissance Technologies | 2026-06-30 | 110K | $9.5M | 0.01% | -89K |
| Millennium Management | 2026-06-30 | 41K | $3.5M | 0.00% | -1.5M |
| Two Sigma Investments | 2026-06-30 | 5K | $469K | 0.00% | -7K |
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.
Financials
SEC XBRL, as filed. JSONIn Q2 FY 2027 (quarter ended 2026-07-31) Ambarella reported revenue of $108.1M, up 13.2% from the same quarter a year earlier, and net loss of $6.7M (-0.15 diluted EPS). In FY 2026 it generated $73.5M of operating cash flow and spent $1.0M on buybacks.
- Cash
- $101.8M
- Equity
- $620.3M
- Total assets
- $780.2M
- Shares outstanding
- 44,140,971
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2027 | 2026-07-31 | $108.1M | -$6.7M | -6.2% | -0.15 |
| Q1 FY 2027 | 2026-04-30 | $100.4M | -$18.1M | -18.0% | -0.41 |
| Q4 FY 2026derived | 2026-01-31 | $100.9M | -$16.4M | -16.3% | n/a |
| Q3 FY 2026 | 2025-10-31 | $108.5M | -$15.1M | -13.9% | -0.35 |
| Q2 FY 2026 | 2025-07-31 | $95.5M | -$20.0M | -20.9% | -0.47 |
| Q1 FY 2026 | 2025-04-30 | $85.9M | -$24.3M | -28.3% | -0.58 |
| Q4 FY 2025derived | 2025-01-31 | $84.0M | -$20.2M | -24.1% | n/a |
| Q3 FY 2025 | 2024-10-31 | $82.7M | -$24.1M | -29.1% | -0.58 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2026 | 2026-01-31 | $390.7M | -$75.9M | $73.5M | $15.5M | $1.0M | n/a |
| FY 2025 | 2025-01-31 | $284.9M | -$117.1M | $33.8M | $10.4M | $0 | n/a |
| FY 2024 | 2024-01-31 | $226.5M | -$169.4M | $19.0M | $12.0M | $0 | n/a |
| FY 2023 | 2023-01-31 | $337.6M | -$65.4M | $44.1M | $15.1M | $0 | n/a |
| FY 2022 | 2022-01-31 | $331.9M | -$26.4M | $38.8M | $9.7M | $0 | n/a |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-07-31; shares outstanding as of 2026-08-31 from the cover page.
What this page is
Ambarella 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 Ambarella (AMBA), SEC CIK 1280263, listed on Nasdaq, 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 2026-10-02.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 2026-09-25.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 2026-10-30.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
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-07-31.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 2026-09-03.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 2026-09-25.JSON and CSV
- Company record
- EDGAR filing index for CIK 1280263Ticker, 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.
Other companies the SEC classifies as semiconductors & related devices
Other company pages
Datasets
Frequently Asked Questions
How much of AMBA is sold short?
4,719,646 shares were held short at the 2026-10-15 settlement, 4.3 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 AMBA's daily short volume?
On 2026-11-02, 219,481 of the 415,088 AMBA shares reported to FINRA were sold short, 52.9% of the day's reported volume. Short volume is a flow for one day, not a position.
Does AMBA have fails to deliver?
The SEC's latest file shows 3 AMBA shares failed to deliver at settlement 2026-10-02. Fails are reported per settlement date and published twice a month with a lag.
Are AMBA insiders buying or selling?
Insiders at AMBA reported 6 open-market sells worth $1.1M in the last 90 days and no open-market buys. Latest filing: PAISLEY CHRISTOPHER B (Director) on 2026-09-25.
Have AMBA insiders filed to sell?
24 Form 144 notices on file for AMBA worth $23.3M at the prices reported; 2 in the last 90 days worth $145K. Latest: PAISLEY CHRISTOPHER B filed on 2026-09-25 to sell 250 shares ($18K) from 2026-09-25.
Who owns 5% or more of AMBA?
4 holders report 5% or more of AMBA in their latest filing, all on Schedule 13G (passive). The largest reported stake is Vanguard Portfolio Management at 7.0% of the class (3,107,820 shares), filed 2026-10-30 for an event on 2026-09-30.
What did AMBA report last quarter?
In Q2 FY 2027 (quarter ended 2026-07-31) Ambarella reported revenue of $108.1M, up 13.2% from the same quarter a year earlier, and net loss of $6.7M (-0.15 diluted EPS). In FY 2026 it generated $73.5M of operating cash flow and spent $1.0M on buybacks.
Which tracked 13F managers own AMBA?
6 of the 30 tracked 13F managers held AMBA shares at their latest filing, $110.3M in all. The largest: D. E. Shaw & Co. (515K shares, $44.2M), Cliff Asness's AQR Capital Management (496K shares, $42.5M), Steve Cohen's Point72 Asset Management (118K shares, $10.1M), Renaissance Technologies (110K shares, $9.5M), Izzy Englander's Millennium Management (41K shares, $3.5M), Two Sigma Investments (5K shares, $469K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.