ARM Arm Holdings plc
Arm Holdings plc (ARM) Institutional Ownership
What the institutions did with ARM last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended September 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| Alphabet Inc. | 2.0M | 14.8% |
| BARCLAYS PLC | 948.6K | 7.2% |
| Robeco Schweiz AG | 777.2K | 5.9% |
| Hyperion Asset Management Ltd | 727.3K | 5.5% |
| Mirae Asset Global Investments Co., Ltd. | 621.4K | 4.7% |
| CITIGROUP INC | 576.3K | 4.4% |
| ProShare Advisors LLC | 421.8K | 3.2% |
| CONGRESS ASSET MANAGEMENT CO | 389.1K | 2.9% |
| Swedbank AB | 327.8K | 2.5% |
| Pacific Heights Asset Management LLC | 320.0K | 2.4% |
| Sustainable Growth Advisers, LP | 319.1K | 2.4% |
| LPL Financial LLC | 312.8K | 2.4% |
| NEOS Investment Management LLC | 286.1K | 2.2% |
| AGF MANAGEMENT LTD | 277.8K | 2.1% |
| Bank of New York Mellon Corp | 256.0K | 1.9% |
| TRAN CAPITAL MANAGEMENT, L.P. | 237.3K | 1.8% |
| GF FUND MANAGEMENT CO. LTD. | 213.9K | 1.6% |
| CIBC Asset Management Inc | 152.5K | 1.2% |
| Reynders McVeigh Capital Management, LLC | 129.6K | 1.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 118.8K | 0.9% |
| Raiffeisen Bank International AG | 110.2K | 0.8% |
| DEUTSCHE BANK AG\ | 96.6K | 0.7% |
| M & L Capital Management Ltd | 92.3K | 0.7% |
| UNICOM Systems, Inc. | 89.0K | 0.7% |
| SBI Securities Co., Ltd. | 87.4K | 0.7% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| BARCLAYS PLC | Increased | 661.4K | 948.6K | +287.2K |
| AGF MANAGEMENT LTD | Increased | 1.5K | 277.8K | +276.3K |
| CITIGROUP INC | Reduced | 834.9K | 576.3K | -258.6K |
| NEOS Investment Management LLC | Increased | 87.4K | 286.1K | +198.7K |
| Hyperion Asset Management Ltd | Increased | 531.3K | 727.3K | +195.9K |
| Tensor Edge Capital, LLC | Sold Out | 154.1K | 0 | -154.1K |
| Oriental Harbor Investment Master Fund | Sold Out | 150.6K | 0 | -150.6K |
| Raiffeisen Bank International AG | Increased | 1.8K | 110.2K | +108.4K |
| GF FUND MANAGEMENT CO. LTD. | Increased | 119.9K | 213.9K | +94.0K |
| Prospera Financial Services Inc | Reduced | 97.6K | 5.1K | -92.5K |
| M & L Capital Management Ltd | New | 0 | 92.3K | +92.3K |
| Robeco Institutional Asset Management B.V. | Reduced | 100.2K | 12.6K | -87.6K |
| DEUTSCHE BANK AG\ | Reduced | 176.1K | 96.6K | -79.6K |
| Fideuram Asset Management (Ireland) dac | Reduced | 103.0K | 27.4K | -75.6K |
| Cambridge Investment Research Advisors, Inc. | Reduced | 122.8K | 50.5K | -72.3K |
| LBP AM SA | Reduced | 102.9K | 32.9K | -70.0K |
| Sustainable Growth Advisers, LP | Reduced | 386.0K | 319.1K | -66.9K |
| Rakuten Investment Management, Inc. | New | 0 | 60.4K | +60.4K |
| IMC-Chicago, LLC | Reduced | 76.7K | 21.9K | -54.8K |
| Robeco Schweiz AG | Reduced | 827.4K | 777.2K | -50.1K |
| Union Bancaire Privee, UBP SA | Increased | 34.3K | 79.5K | +45.2K |
| Renaissance Capital LLC | Sold Out | 44.6K | 0 | -44.6K |
| CIBC Asset Management Inc | Increased | 111.4K | 152.5K | +41.1K |
| Maple Capital Management, Inc. | New | 0 | 39.1K | +39.1K |
| Creative Planning | Increased | 43.6K | 81.5K | +37.9K |
| NATIXIS | Sold Out | 37.7K | 0 | -37.7K |
| SEB Asset Management AB | Increased | 6.1K | 40.0K | +33.9K |
| Eurizon Capital SGR S.p.A. | Reduced | 95.0K | 65.5K | -29.5K |
| AEGON ASSET MANAGEMENT UK Plc | New | 0 | 27.2K | +27.2K |
| Swedbank AB | Increased | 300.8K | 327.8K | +27.0K |
| VESTOR CAPITAL, LLC | Sold Out | 25.4K | 0 | -25.4K |
| Caitong International Asset Management Co., Ltd | Increased | 23 | 23.2K | +23.2K |
| Gunderson Capital Management LLC | Sold Out | 23.0K | 0 | -23.0K |
| Concurrent Investment Advisors, LLC | Reduced | 30.6K | 7.9K | -22.7K |
| Waratah Capital Advisors Ltd. | Reduced | 30.1K | 9.9K | -20.2K |
| CONGRESS ASSET MANAGEMENT CO | Reduced | 409.0K | 389.1K | -19.9K |
| Bank of New York Mellon Corp | Increased | 236.3K | 256.0K | +19.6K |
| Decker Retirement Planning Inc. | Sold Out | 19.0K | 0 | -19.0K |
| Atria Investments, Inc | Increased | 4.5K | 22.7K | +18.1K |
| Reynders McVeigh Capital Management, LLC | Increased | 114.0K | 129.6K | +15.6K |
| ASSETMARK, INC | Reduced | 81.8K | 67.5K | -14.3K |
| Atlatl Advisers LLC | Sold Out | 14.3K | 0 | -14.3K |
| BOCHK Asset Management Ltd | Increased | 6.7K | 20.4K | +13.7K |
| Trek Financial, LLC | Sold Out | 13.1K | 0 | -13.1K |
| Laurion Capital Management LP | New | 0 | 10.9K | +10.9K |
| AIA Group Ltd | Reduced | 18.1K | 7.3K | -10.8K |
| COMMONWEALTH EQUITY SERVICES, LLC | Reduced | 34.2K | 23.5K | -10.7K |
| OPPENHEIMER & CO INC | Increased | 35.5K | 45.6K | +10.2K |
| Pictet Asset Management Holding SA | Reduced | 58.6K | 48.8K | -9.9K |
| Vontobel Holding Ltd. | Reduced | 21.9K | 12.5K | -9.4K |
| ProShare Advisors LLC | Increased | 412.6K | 421.8K | +9.2K |
| CANTOR FITZGERALD INVESTMENT ADVISORS L.P. | New | 0 | 8.5K | +8.5K |
| Smith Group Asset Management, LLC | Sold Out | 8.5K | 0 | -8.5K |
| Asset Management One Co., Ltd. | Increased | 10.9K | 19.2K | +8.3K |
| Maxi Investments CY Ltd | Sold Out | 8.3K | 0 | -8.3K |
| Ahara Advisors LLC | Reduced | 10.6K | 2.5K | -8.1K |
| Maytree Asset Management Ltd | Increased | 36.4K | 44.2K | +7.9K |
| Savant Capital, LLC | Increased | 2.8K | 10.3K | +7.5K |
| BI Asset Management Fondsmaeglerselskab A/S | Sold Out | 7.1K | 0 | -7.1K |
| Mitsubishi UFJ Asset Management Co., Ltd. | Increased | 53.7K | 60.5K | +6.8K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.