Two Sigma Investments
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Two Sigma Investments’s iRhythm Holdings IRTC Stock Holding History

Two Sigma Investments’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
2021
Q4 		– Sell
-5,900
Closed -$346K – 4558
2021
Q3 		$346K Buy
+5,900
New +$313K ﹤0.01% 3552
2019
Q4 		– Sell
-5,400
Closed -$400K – 3808
2019
Q3 		$400K Sell
5,400
-2,600
-33% -$201K ﹤0.01% 2730
2019
Q2 		$633K Buy
+8,000
New +$583K ﹤0.01% 2315

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

Two Sigma Investments's IRTC Position: Q1 2026 in Review

Two Sigma Investments opened a new position in iRhythm Holdings (IRTC) in Q1 2026: 52,600 shares worth $6.21M. The stake represents 0.01% of the portfolio and ranks #1790 among its holdings. This is a return to the name: Two Sigma Investments previously reported a position in IRTC as recently as Q3 2025.

Two Sigma Investments first reported a position in IRTC in Q3 2017 and has held it in 14 quarters since. The position peaked at $32.1M in Q2 2021. 304 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Two Sigma Investments held 52,600 shares of iRhythm Holdings worth $6.21M as of Q1 2026.
  • iRhythm Holdings was a new Two Sigma Investments position in Q1 2026.
  • iRhythm Holdings made up 0.01% of Two Sigma Investments's portfolio in Q1 2026, its #1790 holding.
  • Two Sigma Investments first reported a position in iRhythm Holdings in Q3 2017 and has held it in 14 quarters since.
  • Two Sigma Investments's iRhythm Holdings position peaked at $32.1M in Q2 2021.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Two Sigma Investments's 13F filing for Q1 2026, filed 15 May 2026.