Arrowstreet Capital
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Arrowstreet Capital’s iRhythm Holdings IRTC Stock Holding History

Arrowstreet Capital’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 		$68.8M Sell
582,879
-24,090
-4% -$3.48M 0.04% 404
2025
Q4 		$108M Buy
606,969
+65,930
+12% +$11.7M 0.06% 284
2025
Q3 		$93.1M Buy
541,039
+532,735
+6,415% +$84.7M 0.06% 299
2025
Q2 		$1.28M Buy
+8,304
New +$1.07M ﹤0.01% 1563

Other funds holding IRTC

BlackRock
BlackRock New York $5.72T AUM 30.48% 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 $1.61T AUM 30.72% 1-Year Est. Return

Arrowstreet Capital's IRTC Position: Q1 2026 in Review

Arrowstreet Capital reduced its iRhythm Holdings (IRTC) stake by 4% in Q1 2026, selling an estimated $3.48M and leaving 582,879 shares worth $68.8M. The position accounts for 0.04% of the portfolio, ranked #404.

Arrowstreet Capital first reported a position in IRTC in Q2 2025 and has held it in 4 quarters since. The position peaked at $108M in Q4 2025. 304 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Arrowstreet Capital held 582,879 shares of iRhythm Holdings worth $68.8M as of Q1 2026.
  • Arrowstreet Capital sold 24,090 iRhythm Holdings shares in Q1 2026, an estimated $3.48M.
  • iRhythm Holdings made up 0.04% of Arrowstreet Capital's portfolio in Q1 2026, its #404 holding.
  • Arrowstreet Capital first reported a position in iRhythm Holdings in Q2 2025 and has held it in 4 quarters since.
  • Arrowstreet Capital's iRhythm Holdings position peaked at $108M in Q4 2025.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Arrowstreet Capital's 13F filing for Q1 2026, filed 14 May 2026.