Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in IRTC held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 2.7M | $323.6M | -2.6% | 8.345% | 0.01% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.8M | $212.0M | β | 5.468% | 0.01% |
| 3 | RTW INVESTMENTS, LP | 1.7M | $196.9M | +41.2% | 5.079% | 1.96% |
| 4 | Artisan Partners Limited Partnership | 1.5M | $171.2M | -4.0% | 4.416% | 0.28% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 1.4M | $170.6M | β | 4.401% | 0.00% |
| 6 | FMR LLC | 1.4M | $160.7M | +116.6% | 4.146% | 0.01% |
| 7 | Holocene Advisors, LP | 1.2M | $147.4M | +82.7% | 3.801% | 0.36% |
| 8 | UBS ASSET MANAGEMENT AMERICAS INC | 1.0M | $123.6M | +26.2% | 3.188% | 0.03% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 817K | $96.5M | -4.8% | 2.487% | 0.01% |
| 10 | STATE STREET CORP | 788K | $93.0M | +3.1% | 2.399% | 0.00% |
| 11 | BNP Paribas Asset Management Holding S.A. | 762K | $89.9M | +30.7% | 2.320% | 0.10% |
| 12 | EVENTIDE ASSET MANAGEMENT, LLC | 761K | $89.8M | +9.9% | 2.316% | 1.48% |
| 13 | FULLER & THALER ASSET MANAGEMENT, INC. | 675K | $79.6M | +5.5% | 2.054% | 0.27% |
| 14 | BLAIR WILLIAM & CO/IL | 628K | $74.2M | -12.6% | 1.913% | 0.21% |
| 15 | Point72 Asset Management, L.P. | 621K | $73.3M | +183.0% | 1.891% | 0.10% |
| 16 | BRAIDWELL LP | 610K | $72.0M | +180.8% | 1.857% | 2.40% |
| 17 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 583K | $68.8M | -4.0% | 1.774% | 0.04% |
| 18 | D. E. Shaw & Co., Inc. | 564K | $66.6M | +56.5% | 1.718% | 0.06% |
| 19 | Stephens Investment Management Group LLC | 562K | $66.3M | +8.1% | 1.709% | 0.91% |
| 20 | Capital Research Global Investors | 510K | $60.1M | -57.0% | 1.551% | 0.01% |
| 21 | Allspring Global Investments Holdings, LLC | 467K | $55.2M | +14.6% | 1.422% | 0.09% |
| 22 | BANK OF AMERICA CORP /DE/ | 433K | $51.0M | +21.9% | 1.317% | 0.00% |
| 23 | Polar Capital Holdings Plc | 422K | $49.8M | +36.8% | 1.283% | 0.18% |
| 24 | MANUFACTURERS LIFE INSURANCE COMPANY, THE | 391K | $46.1M | +99.2% | 1.189% | 0.04% |
| 25 | MACKENZIE FINANCIAL CORP | 371K | $43.8M | +7.0% | 1.131% | 0.05% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in IRTC β a direct measure of their conviction.
Filings activity in IRTC during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new IRTC position in Q1 2026
Institutions that fully closed their IRTC position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 295 | 11% | 103.80% | 54.62 pp | $3.88B | 34% |
| Q4 2025 | 330 | +1.5% | 158.42% | +6.01 pp | $5.91B | +3.9% |
| Q3 2025 | 325 | +7.3% | 152.41% | +14.39 pp | $5.69B | +10% |
| Q2 2025 | 303 | +22% | 138.02% | +43.54 pp | $5.15B | +46% |
| Q1 2025 | 249 | +13% | 94.48% | +18.86 pp | $3.53B | +25% |
| Q4 2024 | 221 | 4.3% | 75.62% | +10.08 pp | $2.82B | +15% |
| Q3 2024 | 231 | +3.6% | 65.54% | 29.92 pp | $2.45B | 31% |
| Q2 2024 | 223 | β | 95.46% | β | $3.56B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying IRTC stock.
Based on Q1 2026 13F filings, institutional ownership of iRhythm Technologies, Inc. stands at 103.8%, held across 295 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of IRTC, with approximately 2,741,505 shares worth $0.32B as of Q1 2026.
Yes β 1 widely-followed marquee investor appear among the top 25 institutional holders of IRTC, including Point72 Asset Management, L.P..
Our composite Smart Money Score for IRTC is 27 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
43 institutions opened new positions in IRTC during Q1 2026, while 78 fully exited. 41 added to existing positions and 210 trimmed.
IRTC institutional ownership fell by 54.62 percentage points quarter-over-quarter, with a net change of -35 holders.
The top 10 institutions account for 43.7% of all reported 13F value in IRTC, and the top 25 account for 69.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
iRhythm Technologies, Inc. (IRTC) Institutional Ownership