IRTC iRhythm Technologies, Inc.
iRhythm Technologies, Inc. (IRTC) Institutional Ownership
What the institutions did with IRTC 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 |
|---|---|---|
| Allspring Global Investments Holdings, LLC | 269.9K | 23.7% |
| CITIGROUP INC | 237.1K | 20.8% |
| TimesSquare Capital Management, LLC | 147.6K | 13.0% |
| M&G PLC | 122.0K | 10.7% |
| C WorldWide Group Holding A/S | 80.0K | 7.0% |
| Kampmann Melissa S. | 20.9K | 1.8% |
| Assenagon Asset Management S.A. | 20.7K | 1.8% |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC | 19.8K | 1.7% |
| Creative Planning | 19.1K | 1.7% |
| BANQUE PICTET & CIE SA | 18.6K | 1.6% |
| ABN AMRO INVESTMENT SOLUTIONS | 16.0K | 1.4% |
| OPPENHEIMER & CO INC | 16.0K | 1.4% |
| Y-Intercept (Hong Kong) Ltd | 13.8K | 1.2% |
| WoodTrust Financial Corp | 12.0K | 1.1% |
| State of New Jersey Common Pension Fund D | 11.1K | 1.0% |
| B. Metzler seel. Sohn & Co. AG | 11.1K | 1.0% |
| EXCHANGE TRADED CONCEPTS, LLC | 9.7K | 0.9% |
| ARIZONA STATE RETIREMENT SYSTEM | 9.3K | 0.8% |
| Values First Advisors, Inc. | 7.4K | 0.7% |
| Pictet Asset Management Holding SA | 5.2K | 0.5% |
| VIRGINIA RETIREMENT SYSTEMS ET Al | 5.0K | 0.4% |
| ProShare Advisors LLC | 4.3K | 0.4% |
| Mitsubishi UFJ Asset Management Co., Ltd. | 4.2K | 0.4% |
| HARBOR CAPITAL ADVISORS, INC. | 4.0K | 0.4% |
| Atria Investments, Inc | 3.9K | 0.3% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| M&G PLC | New | 0 | 122.0K | +122.0K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 59.7K | 3.8K | -55.9K |
| Allspring Global Investments Holdings, LLC | Reduced | 300.1K | 269.9K | -30.2K |
| Assenagon Asset Management S.A. | Reduced | 44.3K | 20.7K | -23.6K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 13.8K | +13.8K |
| HARBOR CAPITAL ADVISORS, INC. | Reduced | 17.2K | 4.0K | -13.1K |
| CITIGROUP INC | Reduced | 249.4K | 237.1K | -12.3K |
| TimesSquare Capital Management, LLC | Increased | 137.3K | 147.6K | +10.3K |
| Creative Planning | Increased | 9.6K | 19.1K | +9.5K |
| Ascent Group, LLC | Reduced | 8.8K | 3.9K | -4.9K |
| ABN AMRO INVESTMENT SOLUTIONS | Increased | 11.5K | 16.0K | +4.5K |
| Atria Investments, Inc | New | 0 | 3.9K | +3.9K |
| Harbour Capital Advisors, LLC | Sold Out | 3.6K | 0 | -3.6K |
| BANQUE PICTET & CIE SA | Reduced | 21.8K | 18.6K | -3.2K |
| VIRGINIA RETIREMENT SYSTEMS ET Al | Reduced | 8.2K | 5.0K | -3.2K |
| Fulcrum Asset Management LLP | New | 0 | 2.8K | +2.8K |
| OPPENHEIMER ASSET MANAGEMENT INC. | New | 0 | 2.3K | +2.3K |
| Abel Hall, LLC | New | 0 | 2.3K | +2.3K |
| Pinnacle Wealth Planning Services, Inc. | Increased | 86 | 2.3K | +2.2K |
| Vise Technologies, Inc. | New | 0 | 1.8K | +1.8K |
| EXCHANGE TRADED CONCEPTS, LLC | Increased | 8.3K | 9.7K | +1.4K |
| Values First Advisors, Inc. | Increased | 6.1K | 7.4K | +1.3K |
| Sterling Capital Management LLC | Increased | 116 | 1.1K | +977 |
| TOKIO MARINE ASSET MANAGEMENT CO LTD | Sold Out | 891 | 0 | -891 |
| State of Wyoming | Sold Out | 863 | 0 | -863 |
| DekaBank Deutsche Girozentrale | New | 0 | 759 | +759 |
| Bayforest Capital Ltd | Sold Out | 750 | 0 | -750 |
| STRS OHIO | Increased | 900 | 1.6K | +700 |
| Meriwether Wealth & Planning, LLC | New | 0 | 550 | +550 |
| Spire Wealth Management | Sold Out | 419 | 0 | -419 |
| Caitong International Asset Management Co., Ltd | Sold Out | 415 | 0 | -415 |
| Mitsubishi UFJ Asset Management Co., Ltd. | Reduced | 4.6K | 4.2K | -410 |
| KBC Group NV | Increased | 870 | 1.2K | +368 |
| China Universal Asset Management Co., Ltd. | Increased | 1.6K | 2.0K | +360 |
| ARIZONA STATE RETIREMENT SYSTEM | Increased | 8.9K | 9.3K | +341 |
| State of Alaska, Department of Revenue | Reduced | 2.0K | 1.7K | -337 |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC | Reduced | 20.1K | 19.8K | -289 |
| Pictet Asset Management Holding SA | Reduced | 5.5K | 5.2K | -281 |
| MCF Advisors LLC | Sold Out | 227 | 0 | -227 |
| HARBOR INVESTMENT ADVISORY, LLC | Increased | 420 | 623 | +203 |
| ProShare Advisors LLC | Reduced | 4.5K | 4.3K | -179 |
| Root Financial Partners, LLC | New | 0 | 176 | +176 |
| Swiss Life Asset Management Ltd | Increased | 2.3K | 2.4K | +146 |
| Kampmann Melissa S. | Reduced | 21.0K | 20.9K | -140 |
| ASSETMARK, INC | Reduced | 1.2K | 1.0K | -130 |
| Covestor Ltd | Increased | 288 | 417 | +129 |
| Versant Capital Management, Inc | Increased | 99 | 221 | +122 |
| XPONANCE LLC | Reduced | 3.3K | 3.2K | -101 |
| TSFG, LLC | Sold Out | 100 | 0 | -100 |
| Parkside Financial Bank & Trust | Increased | 15 | 104 | +89 |
| SIMPLEX TRADING, LLC | Reduced | 450 | 369 | -81 |
| FIRST HORIZON CORP | New | 0 | 77 | +77 |
| OPPENHEIMER & CO INC | Increased | 15.9K | 16.0K | +54 |
| AdvisorNet Financial, Inc | Sold Out | 53 | 0 | -53 |
| WPG Advisers, LLC | New | 0 | 43 | +43 |
| Vontobel Holding Ltd. | Increased | 2.1K | 2.2K | +36 |
| Ascentis Independent Advisors | New | 0 | 33 | +33 |
| SIMS INVESTMENT MANAGEMENT, LLC | Sold Out | 20 | 0 | -20 |
| Elyxium Wealth, LLC | New | 0 | 18 | +18 |
| Farther Finance Advisors, LLC | Increased | 135 | 152 | +17 |
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.