XOOMAR

Arm Holdings (ARM)

Arm Holdings on one page: short interest, daily short volume, fails to deliver, planned sales, 13F holders and insider trades. Listed on Nasdaq.

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16.2M

Short interest

settlement 2026-09-30

2.3

Days to cover

-1.6 days vs prior

62.3%

Short share of volume

2026-10-09

3,418

Fails to deliver

settlement 2026-09-14

-$5.8M

Insider flow, 90 days

0 buys, 2 sells

As of 2026-10-09.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 30 September 2026, short interest in ARM is 16,189,965 shares, down 550,650 shares over the last month. Over the last 48 readings it ranged from 12,387,150 shares (15 January 2025) to 18,788,059 shares (15 May 2026). At the reported average volume of 7.1M shares a day that is 2.3 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-09-3016,189,965+4.3%7,051,6482.30
2026-09-1515,521,694-7.3%3,942,8243.94
2026-08-3116,740,615-8.3%3,817,1814.39
2026-08-1418,264,105+8.3%4,430,1424.12
2026-07-3116,867,253-3.4%6,369,0772.65
2026-07-1517,460,573+1.4%5,976,1062.92
2026-06-3017,227,301+5.2%11,645,2261.48
2026-06-1516,369,236-11.6%12,842,9011.27
2026-05-2918,511,799-1.5%12,978,7321.43
2026-05-1518,788,059+16.6%11,223,5491.67
2026-04-3016,114,440+1.0%10,555,2371.53
2026-04-1515,953,489+3.3%6,068,2172.63
2026-03-3115,447,396+5.1%10,092,0311.53
2026-03-1314,711,957-0.8%3,537,0774.16
2026-02-2714,825,255-13.5%3,442,7084.31
2026-02-1317,139,566+11.7%9,306,1541.84
2026-01-3015,344,152-11.7%7,308,2782.10
2026-01-1517,380,246+11.9%5,650,1813.08
2025-12-3115,534,170+11.4%5,225,8272.97
2025-12-1513,950,076-1.8%2,951,3654.73
2025-11-2814,206,776+6.9%3,715,8363.82
2025-11-1413,291,416-0.6%4,560,5962.91
2025-10-3113,377,478-7.0%3,960,2763.38
2025-10-1514,377,672-11.7%7,372,2521.95

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 9 October 2026, the short share of ARM volume is 62.3%, up 1.4 points over the last five sessions. Over the last 30 readings it ranged from 37.0% (2 September 2026) to 65.3% (18 September 2026). The latest reading is 6.5 points above the 30-session average of 55.8%, on 2.0M shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-10-091.2M2.0M62.3%3,494
2026-10-081.6M2.7M60.9%4,936
2026-10-07781K1.3M58.0%4,172
2026-10-06833K1.4M57.9%9,121
2026-10-05688K1.1M61.2%2,098
2026-10-021.7M2.8M60.9%4,944
2026-10-01762K1.3M58.0%1,090
2026-09-30995K1.8M56.5%2,906
2026-09-291.8M2.9M63.0%99,926
2026-09-282.5M4.2M60.1%130,086
2026-09-251.8M3.0M61.4%1,155
2026-09-242.7M4.4M61.8%6,826
2026-09-231.9M3.0M62.0%2,983
2026-09-222.0M3.2M62.4%5,532
2026-09-213.6M5.7M63.2%5,766
2026-09-181.4M2.1M65.3%1,162
2026-09-171.1M2.4M47.2%3,346
2026-09-16610K1.2M48.9%3,354
2026-09-15836K1.7M49.2%74,426
2026-09-141.6M2.7M60.4%50,126
2026-09-11824K1.6M50.0%1,722
2026-09-10798K1.4M56.2%66
2026-09-09785K1.6M50.5%1,400
2026-09-081.3M2.3M55.9%214
2026-09-04780K1.6M49.1%1,515
2026-09-03704K1.6M44.1%605
2026-09-02391K1.1M37.0%1,084
2026-09-01546K1.2M44.5%744
2026-08-31442K908K48.7%5,193
2026-08-28976K1.7M57.6%2,092

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 14 September 2026, the fails-to-deliver balance in ARM is 3,418 shares, up 3,372 shares over the last settlement date. Over the last 30 readings it ranged from 6 shares (8 September 2026) to 151,958 shares (25 August 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-09-143,418$264.79$905K
2026-09-1146$254.18$12K
2026-09-0911,523$261.53$3.0M
2026-09-086$252.09$2K
2026-08-28208$255.21$53K
2026-08-25151,958$238.78$36.3M
2026-08-17555$279.44$155K
2026-08-13369$271.87$100K
2026-08-111,435$267.85$384K
2026-08-101,940$282.57$548K
2026-08-071,486$286.68$426K
2026-08-062,770$274.58$761K
2026-08-051,435$280.56$403K
2026-08-041,435$239.06$343K
2026-08-031,475$239.69$354K
2026-07-282,025$266.33$539K
2026-07-276,553$260.01$1.7M
2026-07-24200$283.04$57K
2026-07-232,614$283.40$741K
2026-07-22201$289.73$58K
2026-07-211,865$269.61$503K
2026-07-20444$267.19$119K
2026-07-1728,363$262.01$7.4M
2026-07-165,735$277.01$1.6M
2026-07-141,666$298.99$498K
2026-07-1344$323.39$14K
2026-07-085,680$300.43$1.7M
2026-07-077,332$322.24$2.4M
2026-07-068,462$315.28$2.7M
2026-06-3020,831$343.58$7.2M

Insider trades

SEC Form 4, newest first, 50 of 89 shown. JSON

Insiders at ARM reported 2 open-market sells worth $5.8M in the last 90 days and no open-market buys. Latest filing: Child Jason (Chief Financial Officer) on 2026-09-21.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-21Child JasonChief Financial OfficerSell10K$300.00$3.1M153K
2026-08-31Haas Rene A.Chief Executive OfficerGrant64$108.33$7K339K
2026-08-27Child JasonChief Financial OfficerSell10K$255.33$2.7M164K
2026-08-17Bartels Laura KathleenChief Accounting OfficerTax withholding856$271.43$232K13K
2026-08-17Bartels Laura KathleenChief Accounting OfficerOption exercise819price not stated in the filingnot stated14K
2026-08-17Bartels Laura KathleenChief Accounting OfficerOption exercise862price not stated in the filingnot stated13K
2026-08-07Sine JeffreyDirectorGift10K$0.00$00
2026-06-02Bartels Laura KathleenChief Accounting OfficerSell11K$392.70$4.4M12K
2026-06-01Abbey WilliamChief Commercial OfficerSell4K$415.52$1.6M21K
2026-06-01Abbey WilliamChief Commercial OfficerSell3K$383.73$1.0M24K
2026-05-28Abbey WilliamChief Commercial OfficerSell4K$343.81$1.4M27K
2026-05-22Abbey WilliamChief Commercial OfficerSell2K$305.82$703K31K
2026-05-21Eaton Charlotte ClaireChief People OfficerSell4K$282.77$1.1M8K
2026-05-21Abbey WilliamChief Commercial OfficerSell5K$287.03$1.3M34K
2026-05-21Eaton Charlotte ClaireChief People OfficerSell5K$291.08$1.5M0
2026-05-21Eaton Charlotte ClaireChief People OfficerSell3K$288.10$808K5K
2026-05-20Abbey WilliamChief Commercial OfficerSell5K$257.18$1.3M38K
2026-05-20Eaton Charlotte ClaireChief People OfficerSell3K$252.25$782K12K
2026-05-20Child JasonChief Financial OfficerSell32K$226.54$7.2M174K
2026-05-19Collins SpencerChief Legal OfficerSell41K$215.00$8.8M0
2026-05-19Abbey WilliamChief Commercial OfficerSell11K$224.14$2.4M43K
2026-05-18Grisenthwaite Richard RoyChief ArchitectSell24K$209.15$5.1M0
2026-05-15SOHN YOUNGDirectorTax withholding429$209.16$90K2K
2026-05-15SOHN YOUNGDirectorOption exercise2Kprice not stated in the filingnot stated3K
2026-05-15Schooler RosemaryDirectorOption exercise2Kprice not stated in the filingnot stated10K
2026-05-15Sine JeffreyDirectorOption exercise2Kprice not stated in the filingnot stated10K
2026-05-15JACOBS PAUL EDirectorOption exercise2Kprice not stated in the filingnot stated7K
2026-05-15Child JasonChief Financial OfficerTax withholding38K$209.16$7.9M206K
2026-05-15Child JasonChief Financial OfficerGrant58Kprice not stated in the filingnot stated244K
2026-05-15Child JasonChief Financial OfficerGrant12Kprice not stated in the filingnot stated165K
2026-05-15Child JasonChief Financial OfficerOption exercise5Kprice not stated in the filingnot stated170K
2026-05-15Child JasonChief Financial OfficerOption exercise5Kprice not stated in the filingnot stated187K
2026-05-15Child JasonChief Financial OfficerGrant12Kprice not stated in the filingnot stated182K
2026-05-15Haas Rene A.Chief Executive OfficerTax withholding143K$209.16$30.0M396K
2026-05-15Haas Rene A.Chief Executive OfficerGrant162Kprice not stated in the filingnot stated539K
2026-05-15Haas Rene A.Chief Executive OfficerGrant52Kprice not stated in the filingnot stated377K
2026-05-15Haas Rene A.Chief Executive OfficerGrant52Kprice not stated in the filingnot stated326K
2026-05-15Eaton Charlotte ClaireChief People OfficerOption exercise2Kprice not stated in the filingnot stated19K
2026-05-15Eaton Charlotte ClaireChief People OfficerTax withholding4K$209.16$768K15K
2026-05-15Eaton Charlotte ClaireChief People OfficerGrant6Kprice not stated in the filingnot stated16K
2026-05-15Collins SpencerChief Legal OfficerGrant11Kprice not stated in the filingnot stated11K
2026-05-15Collins SpencerChief Legal OfficerOption exercise4Kprice not stated in the filingnot stated15K
2026-05-15Collins SpencerChief Legal OfficerOption exercise4Kprice not stated in the filingnot stated19K
2026-05-15Collins SpencerChief Legal OfficerGrant10Kprice not stated in the filingnot stated29K
2026-05-15Collins SpencerChief Legal OfficerGrant48Kprice not stated in the filingnot stated77K
2026-05-15Collins SpencerChief Legal OfficerTax withholding36K$209.16$7.6M41K
2026-05-15Grisenthwaite Richard RoyChief ArchitectOption exercise4Kprice not stated in the filingnot stated46K
2026-05-15Grisenthwaite Richard RoyChief ArchitectOption exercise2Kprice not stated in the filingnot stated8K
2026-05-15Grisenthwaite Richard RoyChief ArchitectGrant5Kprice not stated in the filingnot stated6K
2026-05-15Grisenthwaite Richard RoyChief ArchitectGrant13Kprice not stated in the filingnot stated41K

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. JSON

20 Form 144 notices on file for ARM worth $58.9M at the prices reported; 2 in the last 90 days worth $5.8M. Latest: Child Jason filed on 2026-09-21 to sell 10,400 shares ($3.1M) from 2026-09-21.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-21Child JasonOfficer10K$3.1M0.001%2026-09-21Fidelity Brokerage Services LLC
2026-08-27Child JasonOfficer10K$2.7M0.001%2026-08-27Fidelity Brokerage Services LLC
2026-05-21Eaton Charlotte ClaireOfficer12K$3.4M0.001%2026-05-21Fidelity Brokerage Services LLC
2026-05-20Eaton Charlotte ClaireOfficer3K$782K0.000%2026-05-20Fidelity Brokerage Services LLC
2026-05-20Child JasonOfficer32K$7.2M0.003%2026-05-20Fidelity Brokerage Services LLC
2026-05-19Collins SpencerOfficer, Director41K$8.8M0.004%2026-05-19Fidelity Brokerage Services LLC
2026-05-11Collins SpencerOfficer52K$11.0M0.005%2026-05-11Fidelity Brokerage Services LLC
2026-04-22Child JasonOfficer21K$3.8M0.002%2026-04-22Fidelity Brokerage Services LLC
2026-04-14Haas Rene A.Officer, Director9K$1.5M0.001%2026-04-14Fidelity Brokerage Services LLC
2026-03-25Haas Rene A.Officer, Director24K$3.8M0.002%2026-03-25Fidelity Brokerage Services LLC
2026-03-25Child JasonOfficer21K$3.2M0.002%2026-03-25Fidelity Brokerage Services LLC
2026-02-27Haas Rene A.Officer, Director6K$776K0.001%2026-02-27Fidelity Brokerage Services LLC
2026-02-18Child JasonOfficer11K$1.4M0.001%2026-02-18Fidelity Brokerage Services LLC
2026-01-30Haas Rene A.Officer, Director6K$654K0.001%2026-01-30Fidelity Brokerage Services LLC
2025-12-31Haas Rene A.Officer, Director6K$679K0.001%2025-12-31Fidelity Brokerage Services LLC
2025-11-28Haas Rene A.Officer, Director6K$827K0.001%2025-11-28Fidelity Brokerage Services LLC
2025-11-19Child JasonOfficer11K$1.5M0.001%2025-11-19Fidelity Brokerage Services LLC
2025-10-31Haas Rene A.Officer, Director6K$1.0M0.001%2025-10-31Fidelity Brokerage Services LLC
2025-10-14Child JasonOfficer11K$1.9M0.001%2025-10-14Fidelity Brokerage Services LLC
2025-09-30Haas Rene A.Officer, Director6K$862K0.001%2025-09-30Fidelity Brokerage Services LLC

13F holders

Tracked managers holding ARM at their latest 13F. JSON

7 of the 30 tracked managers held ARM at their latest 13F, $308.7M in total at quarter-end prices. Two Sigma Investments is the largest at $234.1M (0.2% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 5 cut.

FundQuarterSharesValueOf portfolioChange in shares
Two Sigma Investments2026-06-30660K$234.1M0.17%+80K
Citadel Advisors2026-06-30168K$59.5M0.01%-121K
Duquesne Family Office2026-06-3028K$10.0M0.19%-79K
D. E. Shaw & Co.2026-06-306K$2.0M0.00%-301K
Bridgewater Associates2026-06-305K$1.7M0.01%-588K
Millennium Management2026-06-303K$1.0M0.00%-267K
Fisher Asset Management2026-06-30946$336K0.00%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

Arm Holdings 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 Arm Holdings (ARM), SEC CIK 1973239, listed on Nasdaq. 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 2026-09-30.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-14.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 2026-09-21.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
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 2026-09-21.JSON and CSV
Company record
EDGAR filing index for CIK 1973239Ticker, 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.

Datasets

Frequently Asked Questions

How much of ARM is sold short?
16,189,965 shares were held short at the 2026-09-30 settlement, 2.3 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 ARM's daily short volume?
On 2026-10-09, 1,229,122 of the 1,972,426 ARM shares reported to FINRA were sold short, 62.3% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ARM have fails to deliver?
The SEC's latest file shows 3,418 ARM shares failed to deliver at settlement 2026-09-14. Fails are reported per settlement date and published twice a month with a lag.
Are ARM insiders buying or selling?
Insiders at ARM reported 2 open-market sells worth $5.8M in the last 90 days and no open-market buys. Latest filing: Child Jason (Chief Financial Officer) on 2026-09-21.
Have ARM insiders filed to sell?
20 Form 144 notices on file for ARM worth $58.9M at the prices reported; 2 in the last 90 days worth $5.8M. Latest: Child Jason filed on 2026-09-21 to sell 10,400 shares ($3.1M) from 2026-09-21.
Which tracked 13F managers own ARM?
7 of the 30 tracked 13F managers held ARM shares at their latest filing, $308.7M in all. The largest: Two Sigma Investments (660K shares, $234.1M), Ken Griffin's Citadel Advisors (168K shares, $59.5M), Stanley Druckenmiller's Duquesne Family Office (28K shares, $10.0M), D. E. Shaw & Co. (6K shares, $2.0M), Ray Dalio's Bridgewater Associates (5K shares, $1.7M), Izzy Englander's Millennium Management (3K shares, $1.0M). 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.