Capstone Investment Advisors
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Capstone Investment Advisors’s iRhythm Holdings IRTC Stock Holding History

Capstone Investment Advisors’s Portfolio IRTC Stock Details IRTC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$299K Buy
+2,535
New +$366K ﹤0.01% 1363
2024
Q3 		– Sell
-2,253
Closed -$243K – 2060
2024
Q2 		$243K Sell
2,253
-7,036
-76% -$719K ﹤0.01% 1692
2024
Q1 		$1.08M Buy
+9,289
New +$1.04M ﹤0.01% 1103
2023
Q4 		– Sell
-3,096
Closed -$292K – 2246
2023
Q3 		$292K Buy
+3,096
New +$315K ﹤0.01% 1620

Other funds holding IRTC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $41.5B AUM 42.97% 1-Year Est. Return
UBS AM
UBS AM Chicago, Illinois $481B AUM 26.39% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Capstone Investment Advisors's IRTC Position: Q1 2026 in Review

Capstone Investment Advisors opened a new position in iRhythm Holdings (IRTC) in Q1 2026: 2,535 shares worth $299K. The stake represents ﹤0.01% of the portfolio and ranks #1363 among its holdings. This is a return to the name: Capstone Investment Advisors previously reported a position in IRTC as recently as Q2 2024.

Capstone Investment Advisors first reported a position in IRTC in Q3 2023 and has held it in 4 quarters since. The position peaked at $1.08M in Q1 2024. 304 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Capstone Investment Advisors held 2,535 shares of iRhythm Holdings worth $299K as of Q1 2026.
  • iRhythm Holdings was a new Capstone Investment Advisors position in Q1 2026.
  • iRhythm Holdings made up ﹤0.01% of Capstone Investment Advisors's portfolio in Q1 2026, its #1363 holding.
  • Capstone Investment Advisors first reported a position in iRhythm Holdings in Q3 2023 and has held it in 4 quarters since.
  • Capstone Investment Advisors's iRhythm Holdings position peaked at $1.08M in Q1 2024.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Capstone Investment Advisors's 13F filing for Q1 2026, filed 15 May 2026.