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.
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. JSONAs 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.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/arm" 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 |
|---|---|---|---|---|
| 2026-09-30 | 16,189,965 | +4.3% | 7,051,648 | 2.30 |
| 2026-09-15 | 15,521,694 | -7.3% | 3,942,824 | 3.94 |
| 2026-08-31 | 16,740,615 | -8.3% | 3,817,181 | 4.39 |
| 2026-08-14 | 18,264,105 | +8.3% | 4,430,142 | 4.12 |
| 2026-07-31 | 16,867,253 | -3.4% | 6,369,077 | 2.65 |
| 2026-07-15 | 17,460,573 | +1.4% | 5,976,106 | 2.92 |
| 2026-06-30 | 17,227,301 | +5.2% | 11,645,226 | 1.48 |
| 2026-06-15 | 16,369,236 | -11.6% | 12,842,901 | 1.27 |
| 2026-05-29 | 18,511,799 | -1.5% | 12,978,732 | 1.43 |
| 2026-05-15 | 18,788,059 | +16.6% | 11,223,549 | 1.67 |
| 2026-04-30 | 16,114,440 | +1.0% | 10,555,237 | 1.53 |
| 2026-04-15 | 15,953,489 | +3.3% | 6,068,217 | 2.63 |
| 2026-03-31 | 15,447,396 | +5.1% | 10,092,031 | 1.53 |
| 2026-03-13 | 14,711,957 | -0.8% | 3,537,077 | 4.16 |
| 2026-02-27 | 14,825,255 | -13.5% | 3,442,708 | 4.31 |
| 2026-02-13 | 17,139,566 | +11.7% | 9,306,154 | 1.84 |
| 2026-01-30 | 15,344,152 | -11.7% | 7,308,278 | 2.10 |
| 2026-01-15 | 17,380,246 | +11.9% | 5,650,181 | 3.08 |
| 2025-12-31 | 15,534,170 | +11.4% | 5,225,827 | 2.97 |
| 2025-12-15 | 13,950,076 | -1.8% | 2,951,365 | 4.73 |
| 2025-11-28 | 14,206,776 | +6.9% | 3,715,836 | 3.82 |
| 2025-11-14 | 13,291,416 | -0.6% | 4,560,596 | 2.91 |
| 2025-10-31 | 13,377,478 | -7.0% | 3,960,276 | 3.38 |
| 2025-10-15 | 14,377,672 | -11.7% | 7,372,252 | 1.95 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs 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.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 1.2M | 2.0M | 62.3% | 3,494 |
| 2026-10-08 | 1.6M | 2.7M | 60.9% | 4,936 |
| 2026-10-07 | 781K | 1.3M | 58.0% | 4,172 |
| 2026-10-06 | 833K | 1.4M | 57.9% | 9,121 |
| 2026-10-05 | 688K | 1.1M | 61.2% | 2,098 |
| 2026-10-02 | 1.7M | 2.8M | 60.9% | 4,944 |
| 2026-10-01 | 762K | 1.3M | 58.0% | 1,090 |
| 2026-09-30 | 995K | 1.8M | 56.5% | 2,906 |
| 2026-09-29 | 1.8M | 2.9M | 63.0% | 99,926 |
| 2026-09-28 | 2.5M | 4.2M | 60.1% | 130,086 |
| 2026-09-25 | 1.8M | 3.0M | 61.4% | 1,155 |
| 2026-09-24 | 2.7M | 4.4M | 61.8% | 6,826 |
| 2026-09-23 | 1.9M | 3.0M | 62.0% | 2,983 |
| 2026-09-22 | 2.0M | 3.2M | 62.4% | 5,532 |
| 2026-09-21 | 3.6M | 5.7M | 63.2% | 5,766 |
| 2026-09-18 | 1.4M | 2.1M | 65.3% | 1,162 |
| 2026-09-17 | 1.1M | 2.4M | 47.2% | 3,346 |
| 2026-09-16 | 610K | 1.2M | 48.9% | 3,354 |
| 2026-09-15 | 836K | 1.7M | 49.2% | 74,426 |
| 2026-09-14 | 1.6M | 2.7M | 60.4% | 50,126 |
| 2026-09-11 | 824K | 1.6M | 50.0% | 1,722 |
| 2026-09-10 | 798K | 1.4M | 56.2% | 66 |
| 2026-09-09 | 785K | 1.6M | 50.5% | 1,400 |
| 2026-09-08 | 1.3M | 2.3M | 55.9% | 214 |
| 2026-09-04 | 780K | 1.6M | 49.1% | 1,515 |
| 2026-09-03 | 704K | 1.6M | 44.1% | 605 |
| 2026-09-02 | 391K | 1.1M | 37.0% | 1,084 |
| 2026-09-01 | 546K | 1.2M | 44.5% | 744 |
| 2026-08-31 | 442K | 908K | 48.7% | 5,193 |
| 2026-08-28 | 976K | 1.7M | 57.6% | 2,092 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs 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.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-14 | 3,418 | $264.79 | $905K |
| 2026-09-11 | 46 | $254.18 | $12K |
| 2026-09-09 | 11,523 | $261.53 | $3.0M |
| 2026-09-08 | 6 | $252.09 | $2K |
| 2026-08-28 | 208 | $255.21 | $53K |
| 2026-08-25 | 151,958 | $238.78 | $36.3M |
| 2026-08-17 | 555 | $279.44 | $155K |
| 2026-08-13 | 369 | $271.87 | $100K |
| 2026-08-11 | 1,435 | $267.85 | $384K |
| 2026-08-10 | 1,940 | $282.57 | $548K |
| 2026-08-07 | 1,486 | $286.68 | $426K |
| 2026-08-06 | 2,770 | $274.58 | $761K |
| 2026-08-05 | 1,435 | $280.56 | $403K |
| 2026-08-04 | 1,435 | $239.06 | $343K |
| 2026-08-03 | 1,475 | $239.69 | $354K |
| 2026-07-28 | 2,025 | $266.33 | $539K |
| 2026-07-27 | 6,553 | $260.01 | $1.7M |
| 2026-07-24 | 200 | $283.04 | $57K |
| 2026-07-23 | 2,614 | $283.40 | $741K |
| 2026-07-22 | 201 | $289.73 | $58K |
| 2026-07-21 | 1,865 | $269.61 | $503K |
| 2026-07-20 | 444 | $267.19 | $119K |
| 2026-07-17 | 28,363 | $262.01 | $7.4M |
| 2026-07-16 | 5,735 | $277.01 | $1.6M |
| 2026-07-14 | 1,666 | $298.99 | $498K |
| 2026-07-13 | 44 | $323.39 | $14K |
| 2026-07-08 | 5,680 | $300.43 | $1.7M |
| 2026-07-07 | 7,332 | $322.24 | $2.4M |
| 2026-07-06 | 8,462 | $315.28 | $2.7M |
| 2026-06-30 | 20,831 | $343.58 | $7.2M |
Insider trades
SEC Form 4, newest first, 50 of 89 shown. JSONInsiders 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.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-21 | Child Jason | Chief Financial Officer | Sell | 10K | $300.00 | $3.1M | 153K |
| 2026-08-31 | Haas Rene A. | Chief Executive Officer | Grant | 64 | $108.33 | $7K | 339K |
| 2026-08-27 | Child Jason | Chief Financial Officer | Sell | 10K | $255.33 | $2.7M | 164K |
| 2026-08-17 | Bartels Laura Kathleen | Chief Accounting Officer | Tax withholding | 856 | $271.43 | $232K | 13K |
| 2026-08-17 | Bartels Laura Kathleen | Chief Accounting Officer | Option exercise | 819 | price not stated in the filing | not stated | 14K |
| 2026-08-17 | Bartels Laura Kathleen | Chief Accounting Officer | Option exercise | 862 | price not stated in the filing | not stated | 13K |
| 2026-08-07 | Sine Jeffrey | Director | Gift | 10K | $0.00 | $0 | 0 |
| 2026-06-02 | Bartels Laura Kathleen | Chief Accounting Officer | Sell | 11K | $392.70 | $4.4M | 12K |
| 2026-06-01 | Abbey William | Chief Commercial Officer | Sell | 4K | $415.52 | $1.6M | 21K |
| 2026-06-01 | Abbey William | Chief Commercial Officer | Sell | 3K | $383.73 | $1.0M | 24K |
| 2026-05-28 | Abbey William | Chief Commercial Officer | Sell | 4K | $343.81 | $1.4M | 27K |
| 2026-05-22 | Abbey William | Chief Commercial Officer | Sell | 2K | $305.82 | $703K | 31K |
| 2026-05-21 | Eaton Charlotte Claire | Chief People Officer | Sell | 4K | $282.77 | $1.1M | 8K |
| 2026-05-21 | Abbey William | Chief Commercial Officer | Sell | 5K | $287.03 | $1.3M | 34K |
| 2026-05-21 | Eaton Charlotte Claire | Chief People Officer | Sell | 5K | $291.08 | $1.5M | 0 |
| 2026-05-21 | Eaton Charlotte Claire | Chief People Officer | Sell | 3K | $288.10 | $808K | 5K |
| 2026-05-20 | Abbey William | Chief Commercial Officer | Sell | 5K | $257.18 | $1.3M | 38K |
| 2026-05-20 | Eaton Charlotte Claire | Chief People Officer | Sell | 3K | $252.25 | $782K | 12K |
| 2026-05-20 | Child Jason | Chief Financial Officer | Sell | 32K | $226.54 | $7.2M | 174K |
| 2026-05-19 | Collins Spencer | Chief Legal Officer | Sell | 41K | $215.00 | $8.8M | 0 |
| 2026-05-19 | Abbey William | Chief Commercial Officer | Sell | 11K | $224.14 | $2.4M | 43K |
| 2026-05-18 | Grisenthwaite Richard Roy | Chief Architect | Sell | 24K | $209.15 | $5.1M | 0 |
| 2026-05-15 | SOHN YOUNG | Director | Tax withholding | 429 | $209.16 | $90K | 2K |
| 2026-05-15 | SOHN YOUNG | Director | Option exercise | 2K | price not stated in the filing | not stated | 3K |
| 2026-05-15 | Schooler Rosemary | Director | Option exercise | 2K | price not stated in the filing | not stated | 10K |
| 2026-05-15 | Sine Jeffrey | Director | Option exercise | 2K | price not stated in the filing | not stated | 10K |
| 2026-05-15 | JACOBS PAUL E | Director | Option exercise | 2K | price not stated in the filing | not stated | 7K |
| 2026-05-15 | Child Jason | Chief Financial Officer | Tax withholding | 38K | $209.16 | $7.9M | 206K |
| 2026-05-15 | Child Jason | Chief Financial Officer | Grant | 58K | price not stated in the filing | not stated | 244K |
| 2026-05-15 | Child Jason | Chief Financial Officer | Grant | 12K | price not stated in the filing | not stated | 165K |
| 2026-05-15 | Child Jason | Chief Financial Officer | Option exercise | 5K | price not stated in the filing | not stated | 170K |
| 2026-05-15 | Child Jason | Chief Financial Officer | Option exercise | 5K | price not stated in the filing | not stated | 187K |
| 2026-05-15 | Child Jason | Chief Financial Officer | Grant | 12K | price not stated in the filing | not stated | 182K |
| 2026-05-15 | Haas Rene A. | Chief Executive Officer | Tax withholding | 143K | $209.16 | $30.0M | 396K |
| 2026-05-15 | Haas Rene A. | Chief Executive Officer | Grant | 162K | price not stated in the filing | not stated | 539K |
| 2026-05-15 | Haas Rene A. | Chief Executive Officer | Grant | 52K | price not stated in the filing | not stated | 377K |
| 2026-05-15 | Haas Rene A. | Chief Executive Officer | Grant | 52K | price not stated in the filing | not stated | 326K |
| 2026-05-15 | Eaton Charlotte Claire | Chief People Officer | Option exercise | 2K | price not stated in the filing | not stated | 19K |
| 2026-05-15 | Eaton Charlotte Claire | Chief People Officer | Tax withholding | 4K | $209.16 | $768K | 15K |
| 2026-05-15 | Eaton Charlotte Claire | Chief People Officer | Grant | 6K | price not stated in the filing | not stated | 16K |
| 2026-05-15 | Collins Spencer | Chief Legal Officer | Grant | 11K | price not stated in the filing | not stated | 11K |
| 2026-05-15 | Collins Spencer | Chief Legal Officer | Option exercise | 4K | price not stated in the filing | not stated | 15K |
| 2026-05-15 | Collins Spencer | Chief Legal Officer | Option exercise | 4K | price not stated in the filing | not stated | 19K |
| 2026-05-15 | Collins Spencer | Chief Legal Officer | Grant | 10K | price not stated in the filing | not stated | 29K |
| 2026-05-15 | Collins Spencer | Chief Legal Officer | Grant | 48K | price not stated in the filing | not stated | 77K |
| 2026-05-15 | Collins Spencer | Chief Legal Officer | Tax withholding | 36K | $209.16 | $7.6M | 41K |
| 2026-05-15 | Grisenthwaite Richard Roy | Chief Architect | Option exercise | 4K | price not stated in the filing | not stated | 46K |
| 2026-05-15 | Grisenthwaite Richard Roy | Chief Architect | Option exercise | 2K | price not stated in the filing | not stated | 8K |
| 2026-05-15 | Grisenthwaite Richard Roy | Chief Architect | Grant | 5K | price not stated in the filing | not stated | 6K |
| 2026-05-15 | Grisenthwaite Richard Roy | Chief Architect | Grant | 13K | price not stated in the filing | not stated | 41K |
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. JSON20 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.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-21 | Child JasonOfficer | 10K | $3.1M | 0.001% | 2026-09-21 | Fidelity Brokerage Services LLC |
| 2026-08-27 | Child JasonOfficer | 10K | $2.7M | 0.001% | 2026-08-27 | Fidelity Brokerage Services LLC |
| 2026-05-21 | Eaton Charlotte ClaireOfficer | 12K | $3.4M | 0.001% | 2026-05-21 | Fidelity Brokerage Services LLC |
| 2026-05-20 | Eaton Charlotte ClaireOfficer | 3K | $782K | 0.000% | 2026-05-20 | Fidelity Brokerage Services LLC |
| 2026-05-20 | Child JasonOfficer | 32K | $7.2M | 0.003% | 2026-05-20 | Fidelity Brokerage Services LLC |
| 2026-05-19 | Collins SpencerOfficer, Director | 41K | $8.8M | 0.004% | 2026-05-19 | Fidelity Brokerage Services LLC |
| 2026-05-11 | Collins SpencerOfficer | 52K | $11.0M | 0.005% | 2026-05-11 | Fidelity Brokerage Services LLC |
| 2026-04-22 | Child JasonOfficer | 21K | $3.8M | 0.002% | 2026-04-22 | Fidelity Brokerage Services LLC |
| 2026-04-14 | Haas Rene A.Officer, Director | 9K | $1.5M | 0.001% | 2026-04-14 | Fidelity Brokerage Services LLC |
| 2026-03-25 | Haas Rene A.Officer, Director | 24K | $3.8M | 0.002% | 2026-03-25 | Fidelity Brokerage Services LLC |
| 2026-03-25 | Child JasonOfficer | 21K | $3.2M | 0.002% | 2026-03-25 | Fidelity Brokerage Services LLC |
| 2026-02-27 | Haas Rene A.Officer, Director | 6K | $776K | 0.001% | 2026-02-27 | Fidelity Brokerage Services LLC |
| 2026-02-18 | Child JasonOfficer | 11K | $1.4M | 0.001% | 2026-02-18 | Fidelity Brokerage Services LLC |
| 2026-01-30 | Haas Rene A.Officer, Director | 6K | $654K | 0.001% | 2026-01-30 | Fidelity Brokerage Services LLC |
| 2025-12-31 | Haas Rene A.Officer, Director | 6K | $679K | 0.001% | 2025-12-31 | Fidelity Brokerage Services LLC |
| 2025-11-28 | Haas Rene A.Officer, Director | 6K | $827K | 0.001% | 2025-11-28 | Fidelity Brokerage Services LLC |
| 2025-11-19 | Child JasonOfficer | 11K | $1.5M | 0.001% | 2025-11-19 | Fidelity Brokerage Services LLC |
| 2025-10-31 | Haas Rene A.Officer, Director | 6K | $1.0M | 0.001% | 2025-10-31 | Fidelity Brokerage Services LLC |
| 2025-10-14 | Child JasonOfficer | 11K | $1.9M | 0.001% | 2025-10-14 | Fidelity Brokerage Services LLC |
| 2025-09-30 | Haas Rene A.Officer, Director | 6K | $862K | 0.001% | 2025-09-30 | Fidelity Brokerage Services LLC |
13F holders
Tracked managers holding ARM at their latest 13F. JSON7 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.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Two Sigma Investments | 2026-06-30 | 660K | $234.1M | 0.17% | +80K |
| Citadel Advisors | 2026-06-30 | 168K | $59.5M | 0.01% | -121K |
| Duquesne Family Office | 2026-06-30 | 28K | $10.0M | 0.19% | -79K |
| D. E. Shaw & Co. | 2026-06-30 | 6K | $2.0M | 0.00% | -301K |
| Bridgewater Associates | 2026-06-30 | 5K | $1.7M | 0.01% | -588K |
| Millennium Management | 2026-06-30 | 3K | $1.0M | 0.00% | -267K |
| Fisher Asset Management | 2026-06-30 | 946 | $336K | 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
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.
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Datasets
Frequently Asked Questions
How much of ARM is sold short?
What is ARM's daily short volume?
Does ARM have fails to deliver?
Are ARM insiders buying or selling?
Have ARM insiders filed to sell?
Which tracked 13F managers own ARM?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.