XOOMAR

AMBARELLA INC (AMBA)

Every FINRA and SEC series the site collects for AMBARELLA INC: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq, classified by the SEC as semiconductors & related devices.

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4.4M

Short interest

settlement 2026-08-31

4.6

Days to cover

+7.2% vs prior

55.9%

Short share of volume

2026-09-11

350

Fails to deliver

settlement 2026-08-14

-$3.9M

Insider flow, 90 days

0 buys, 9 sells

As of 2026-09-11.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 31 August 2026, short interest in AMBA is 4,364,091 shares, down 790,799 shares over the last month. Over the last 48 readings it ranged from 1,290,536 shares (15 May 2025) to 5,154,890 shares (31 July 2026). At the reported average volume of 943K shares a day that is 4.6 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-314,364,091+7.2%943,1234.63
2026-08-144,070,707-21.0%1,191,2213.42
2026-07-315,154,890+30.6%2,381,6292.16
2026-07-153,945,513+19.7%1,738,0132.27
2026-06-303,295,313+14.8%1,838,0731.79
2026-06-152,870,254+29.5%1,632,8921.76
2026-05-292,217,006-7.9%2,015,8401.10
2026-05-152,407,645-8.3%968,5242.49
2026-04-302,626,588+2.7%744,3063.53
2026-04-152,556,508+21.9%689,6613.71
2026-03-312,096,416-6.4%835,9762.51
2026-03-132,239,523+13.0%842,8722.66
2026-02-271,981,727-2.0%1,079,3051.84
2026-02-132,022,069-11.1%716,2982.82
2026-01-302,273,200-2.4%720,2813.16
2026-01-152,328,921+5.7%1,429,2721.63
2025-12-312,203,545-7.6%582,3253.78
2025-12-152,384,764-14.4%1,017,1792.34
2025-11-282,786,696+44.4%1,361,7272.05
2025-11-141,929,881+12.9%781,8292.47
2025-10-311,708,633-7.2%379,5234.50
2025-10-151,841,712-8.0%577,7633.19
2025-09-302,001,694+1.5%836,3582.39
2025-09-151,971,780-4.8%833,0122.37

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of AMBA volume is 55.9%, down 10.4 points over the last five sessions. Over the last 52 readings it ranged from 33.2% (11 August 2026) to 78.4% (27 August 2026). The latest reading is 7.2 points below the 30-session average of 63.1%, on 580K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-11324K580K55.9%1,639
2026-09-10711K1.1M63.4%2,441
2026-09-091.4M2.6M52.5%17
2026-09-081.0M1.5M69.0%2,290
2026-09-041.8M2.4M73.6%0
2026-09-03771K1.2M66.3%6,110
2026-09-02334K490K68.2%5,897
2026-09-01404K555K72.8%11,191
2026-08-31267K343K77.9%0
2026-08-28371K496K74.7%0
2026-08-27276K352K78.4%501
2026-08-26226K302K74.9%3
2026-08-25175K238K73.4%0
2026-08-24406K600K67.7%2,051
2026-08-21283K372K75.9%0
2026-08-20271K356K76.1%4
2026-08-19237K381K62.3%0
2026-08-18290K403K71.9%0
2026-08-17365K711K51.3%15
2026-08-14119K215K55.3%6
2026-08-13127K218K58.1%188
2026-08-12194K323K59.9%0
2026-08-11160K481K33.2%0
2026-08-10222K386K57.7%260
2026-08-07375K572K65.5%700
2026-08-06338K502K67.4%589
2026-08-05334K682K48.9%313
2026-08-04351K652K53.9%8
2026-08-03560K1.3M43.8%1,205
2026-07-311.8M4.1M43.7%1,263

Fails to deliver

SEC, by settlement date. JSON

As of 14 August 2026, the fails-to-deliver balance in AMBA is 350 shares, up 330 shares over the last settlement date. Over the last 52 readings it ranged from 4 shares (15 June 2026) to 49,807 shares (7 May 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-14350$81.96$29K
2026-08-1120$82.04$2K
2026-08-103,344$86.78$290K
2026-08-06743$81.85$61K
2026-08-05250$82.23$21K
2026-08-0461$82.68$5K
2026-07-297,934$68.97$547K
2026-07-288$68.23$546
2026-07-243,474$70.51$245K
2026-07-17135$63.29$9K
2026-07-153,011$72.90$220K
2026-07-10326$78.38$26K
2026-07-07268$79.73$21K
2026-07-0610,200$78.36$799K
2026-06-302,465$67.01$165K
2026-06-24160$65.51$10K
2026-06-232,105$70.71$149K
2026-06-222,958$69.97$207K
2026-06-181,245$65.88$82K
2026-06-17851$67.12$57K
2026-06-154$67.78$271
2026-06-08110$63.52$7K
2026-06-0516,507$72.05$1.2M
2026-05-26242$87.55$21K
2026-05-1312,455$78.19$974K
2026-05-0849,772$74.27$3.7M
2026-05-0749,807$75.48$3.8M
2026-04-2771$66.87$5K
2026-04-1525$56.20$1K
2026-04-01257$51.48$13K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

Insiders at AMBA reported 9 open-market sells worth $3.9M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Hu Chenming on 2026-09-08.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-08Hu Chenmingn/aGrant3K$0.00$033K
2026-09-08Bryant Gregory Mn/aGrant3K$0.00$06K
2026-09-08Breithaupt Chantelle Yvetten/aGrant3K$0.00$08K
2026-09-08Schwarting Elizabeth Mn/aGrant3K$0.00$010K
2026-09-08Hon Hsiao-Wuenn/aGrant3K$0.00$034K
2026-09-08RICHARDSON DAVID JEFFREYn/aGrant3K$0.00$06K
2026-09-08PAISLEY CHRISTOPHER Bn/aGrant3K$0.00$044K
2026-07-09Chen Yun-LungVP, Business Dev. &amp; MarketingSell6K$78.66$469K61K
2026-07-01Ju Chi-HongSenior VP, Systems &amp; GMSell10K$88.84$888K156K
2026-07-01Wang Feng-MingCEOSell16K$90.08$1.5M774K
2026-06-26PAISLEY CHRISTOPHER Bn/aSell250$62.01$16K41K
2026-06-17Young John AlexanderCFOSell2K$66.98$124K113K
2026-06-17Young John AlexanderCFOSell3K$67.87$216K114K
2026-06-17Lee Chan WChief Operations OfficerSell3K$67.87$200K157K
2026-06-17Ju Chi-HongSenior VP, Systems &amp; GMSell2K$67.87$137K166K
2026-06-17Wang Feng-MingCEOGift10K$0.00$0790K
2026-06-17Wang Feng-MingCEOSell6K$67.87$421K800K
2026-06-12Chen Yun-LungVP, Business Development andSell10K$67.06$661K67K
2026-05-26Young John AlexanderCFOSell400$96.00$38K118K
2026-05-26Young John AlexanderCFOOption exercise400$55.80$22K118K
2026-05-26Wang Feng-MingCEOSell9K$92.05$842K806K
2026-05-26Wang Feng-MingCEOSell6K$91.23$553K815K
2026-05-26Wang Feng-MingCEOSell17K$90.38$1.6M821K
2026-04-21Young John AlexanderCFOSell2K$60.00$118K118K
2026-03-19Wang Feng-MingCEOSell8K$54.14$438K839K
2026-03-19Ju Chi-HongSenior VP, Systems & GM, AsiaSell2K$54.14$117K168K
2026-03-19Lee Chan WChief Operations OfficerSell4K$54.14$197K160K
2026-03-19Young John AlexanderCFOSell3K$54.14$164K120K
2026-03-18Wang Feng-MingCEOGrant16K$0.00$0847K
2026-03-18Ju Chi-HongSenior VP, Systems & GM, AsiaGrant6K$0.00$0170K
2026-03-18Lee Chan WChief Operations OfficerGrant7K$0.00$0164K
2026-03-18Chen Yun-LungVP, Business Development and MGrant3K$0.00$076K
2026-03-18Young John AlexanderCFOGrant6K$0.00$0123K
2026-03-17Wang Feng-MingCEOSell19K$52.77$1.0M831K
2026-03-17Wang Feng-MingCEOOption exercise28Kn/an/a850K
2026-03-17Ju Chi-HongSenior VP, Systems & GM, AsiaSell5K$52.77$250K164K
2026-03-17Ju Chi-HongSenior VP, Systems & GM, AsiaOption exercise10Kn/an/a169K
2026-03-17Lee Chan WChief Operations OfficerSell7K$52.77$355K156K
2026-03-17Lee Chan WChief Operations OfficerOption exercise14Kn/an/a163K
2026-03-17Chen Yun-LungVP, Business Development and MOption exercise5Kn/an/a74K
2026-03-17Young John AlexanderCFOSell5K$52.77$242K117K
2026-03-17Young John AlexanderCFOOption exercise4Kn/an/a122K
2026-03-02Young John AlexanderCFOGrant15K$0.00$0118K
2026-03-02Chen Yun-LungVP, Business Development and MGrant7K$0.00$069K
2026-03-02Lee Chan WChief Operations OfficerGrant25K$0.00$0149K
2026-03-02Ju Chi-HongSenior VP, Systems &amp; GM, AsiaGrant17K$0.00$0159K
2026-03-02Wang Feng-MingCEOGrant53K$0.00$0822K
2026-03-02Wang Feng-MingCEOSell12K$61.42$740K769K
2026-03-02Wang Feng-MingCEOSell32K$60.91$2.0M781K
2026-03-02Wang Feng-MingCEOSell3K$59.53$155K813K

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 the rarer, stronger signal.

Large holders (13D and 13G)

One row per reporting person, newest filing first. JSON

5 holders above 5% have filed on AMBA, all on Schedule 13G (passive). The largest reported stake is Vanguard Portfolio Management at 8.6% of the class (3,752,800 shares), filed 2026-04-28 for an event on 2026-03-31.

FiledFormHolderSharesOf classEvent
2026-08-1413GT. Rowe Price Associates, Inc.investment adviser2.6M5.9%2026-06-30
2026-08-0713GSTATE STREET CORPORATIONparent holding company2.6M5.8%2026-06-30
2026-07-3113GVanguard Capital Managementinvestment adviser2.2M5.0%2026-06-30
2026-04-2813GVanguard Portfolio Managementinvestment adviser3.8M8.6%2026-03-31
2026-03-2613G/Ano. 13The Vanguard Groupinvestment adviser00.0%2026-03-13
2026-01-3013G/Ano. 12The Vanguard Groupinvestment adviser5.5M12.7%2025-12-31

13F holders

Tracked managers holding AMBA at their latest 13F. JSON

7 of the 30 tracked managers held AMBA at their latest 13F, $147.8M in total at quarter-end prices. D. E. Shaw & Co. is the largest at $46.8M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 6 cut.

FundQuarterSharesValueOf portfolioChange in shares
D. E. Shaw & Co.2026-06-30546K$46.8M0.02%+269K
AQR Capital Management2026-06-30496K$42.5M0.01%-232
Citadel Advisors2026-06-30401K$34.4M0.00%-858K
Point72 Asset Management2026-06-30124K$10.6M0.01%-422K
Renaissance Technologies2026-06-30110K$9.5M0.01%-89K
Millennium Management2026-06-3041K$3.5M0.00%-102K
Two Sigma Investments2026-06-305K$469K0.00%-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. JSON

In Q2 2026 (quarter ended 2026-07-31) AMBARELLA INC 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 2025 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

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q2 20262026-07-31$108.1M-$6.7M-6.2%-0.15
Q1 20262026-04-30$100.4M-$18.1M-18.0%-0.41
Q4 2025derived2026-01-31$100.9Mn/an/an/a
Q3 20252025-10-31$108.5M-$15.1M-13.9%-0.35
Q2 20252025-07-31$95.5M-$20.0M-20.9%-0.47
Q1 20252025-04-30$85.9M-$24.3M-28.3%-0.58
Q4 2024derived2025-01-31$84.0Mn/an/an/a
Q3 20242024-10-31$82.7M-$24.1M-29.1%-0.58

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252026-01-31$390.7Mn/a$73.5Mn/a$1.0Mn/a
FY 20242025-01-31$284.9Mn/a$33.8Mn/a$0n/a
FY 20232024-01-31$226.5Mn/a$19.0Mn/a$0n/a
FY 20222023-01-31$337.6Mn/a$44.1Mn/a$0n/a
FY 20212022-01-31$331.9Mn/a$38.8Mn/a$0n/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 cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. 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 INC 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 pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, 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 summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows AMBARELLA INC (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 method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-31.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-14.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-08-14.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC XBRL company factsRefreshed weekly from the SEC's structured data; values are as filed in the 10-Q and 10-K. Latest 2026-07-31.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-08.JSON and CSV
Company record
EDGAR filing index for CIK 1280263Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 14 Sep 05:40 UTC.

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 crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short 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

Datasets

Frequently Asked Questions

How much of AMBA is sold short?
4,364,091 shares were held short at the 2026-08-31 settlement, 4.6 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 2026-09-11, 324,293 of the 580,069 AMBA shares reported to FINRA were sold short, 55.9% 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 350 AMBA shares failed to deliver at settlement 2026-08-14. Fails are reported per settlement date and published twice a month with a lag.
Are AMBA insiders buying or selling?
Insiders at AMBA reported 9 open-market sells worth $3.9M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Hu Chenming on 2026-09-08.
Who owns more than 5% of AMBA?
5 holders above 5% have filed on AMBA, all on Schedule 13G (passive). The largest reported stake is Vanguard Portfolio Management at 8.6% of the class (3,752,800 shares), filed 2026-04-28 for an event on 2026-03-31.
What did AMBA report last quarter?
In Q2 2026 (quarter ended 2026-07-31) AMBARELLA INC 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 2025 it generated $73.5M of operating cash flow and spent $1.0M on buybacks.
Which funds hold AMBA?
7 of the 30 tracked managers held AMBA at their latest 13F, $147.8M in total at quarter-end prices. D. E. Shaw & Co. is the largest at $46.8M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 6 cut.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.