Ranked by reported Q2 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. | 3.0M | $355.1M | +8.9% | 9.085% | 0.01% |
| 2 | RTW INVESTMENTS, LP | 2.2M | $259.6M | +30.8% | 6.642% | 2.22% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.9M | $227.7M | +6.6% | 5.824% | 0.01% |
| 4 | Artisan Partners Limited Partnership | 1.7M | $197.5M | +14.4% | 5.052% | 0.31% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | $174.0M | +1.2% | 4.453% | 0.00% |
| 6 | MILLENNIUM MANAGEMENT LLC | 1.4M | $167.3M | -15.8% | 4.280% | 0.06% |
| 7 | FMR LLC | 1.2M | $141.8M | -12.5% | 3.627% | 0.01% |
| 8 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME | 945K | $112.4M | -9.8% | 2.874% | 0.02% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 882K | $104.9M | +7.9% | 2.684% | 0.01% |
| 10 | EVENTIDE ASSET MANAGEMENT, LLC | 880K | $104.7M | +15.7% | 2.679% | 1.40% |
| 11 | BNP Paribas Asset Management Holding S.A. | 867K | $103.1M | +13.7% | 2.637% | 0.10% |
| 12 | STATE STREET CORP | 857K | $101.9M | +8.6% | 2.606% | 0.00% |
| 13 | Holocene Advisors, LP | 784K | $93.2M | -37.2% | 2.385% | 0.21% |
| 14 | JPMORGAN CHASE & CO | 766K | $90.9M | +7.2% | 2.332% | 0.01% |
| 15 | Stephens Investment Management Group LLC | 693K | $82.5M | +23.5% | 2.110% | 0.88% |
| 16 | FULLER & THALER ASSET MANAGEMENT, INC. | 685K | $81.5M | +1.6% | 2.086% | 0.22% |
| 17 | BRAIDWELL LP | 654K | $77.8M | +7.2% | 1.991% | 2.88% |
| 18 | D. E. Shaw & Co., Inc. | 640K | $76.1M | +13.3% | 1.946% | 0.04% |
| 19 | MANUFACTURERS LIFE INSURANCE COMPANY, THE | 561K | $66.8M | +43.7% | 1.708% | 0.03% |
| 20 | BLAIR WILLIAM & CO/IL | 525K | $62.4M | -16.5% | 1.597% | 0.16% |
| 21 | BANK OF AMERICA CORP /DE/ | 466K | $55.4M | +7.7% | 1.417% | 0.00% |
| 22 | Polar Capital Holdings Plc | 458K | $54.5M | +8.6% | 1.394% | 0.13% |
| 23 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 451K | $53.6M | -22.7% | 1.372% | 0.02% |
| 24 | SCHRODER INVESTMENT MANAGEMENT GROUP | 448K | $53.1M | +80.9% | 1.364% | 0.04% |
| 25 | GOLDMAN SACHS GROUP INC | 362K | $43.1M | +4.0% | 1.103% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in IRTC — a direct measure of their conviction.
Filings activity in IRTC during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 304 | +0.3% | 108.75% | 0.14 pp | $4.23B | +1.1% |
| Q1 2026 | 303 | 8.7% | 108.89% | 0.72 pp | $4.18B | 29% |
| Q4 2025 | 332 | +0.9% | 109.61% | +5.95 pp | $5.93B | +3.6% |
| Q3 2025 | 329 | +8.6% | 103.66% | 7.95 pp | $5.73B | +11% |
| Q2 2025 | 303 | +22% | 111.61% | 1.56 pp | $5.15B | +46% |
| Q1 2025 | 249 | +13% | 113.17% | +3.87 pp | $3.53B | +25% |
| Q4 2024 | 221 | 4.3% | 109.30% | 2.05 pp | $2.82B | +15% |
| Q3 2024 | 231 | — | 111.35% | — | $2.45B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying IRTC stock.
Based on Q2 2026 13F filings, institutional ownership of iRhythm Technologies, Inc. stands at 108.7%, held across 304 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of IRTC, with approximately 2,985,667 shares worth $0.36B as of Q2 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of IRTC, including MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for IRTC is 49 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
39 institutions opened new positions in IRTC during Q2 2026, while 40 fully exited. 166 added to existing positions and 85 trimmed.
IRTC institutional ownership fell by 0.14 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 43.6% of all reported 13F value in IRTC, and the top 25 account for 69.6%.
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