Deerfield Management
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Deerfield Management’s iRhythm Holdings IRTC Stock Holding History

Deerfield Management’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 		– Sell
-12,099
Closed -$2.15M – 120
2025
Q4 		$2.15M Sell
12,099
-5,163
-30% -$915K 0.03% 92
2025
Q3 		$2.97M Buy
+17,262
New +$2.74M 0.05% 89
2025
Q1 		– Sell
-156,012
Closed -$14.1M – 137
2024
Q4 		$14.1M Buy
+156,012
New +$12.3M 0.27% 57
2024
Q2 		– Sell
-2,702
Closed -$313K – 505
2024
Q1 		$313K Buy
+2,702
New +$304K 0.01% 244
2021
Q4 		– Sell
-60,271
Closed -$3.53M – 136
2021
Q3 		$3.53M Buy
+60,271
New +$3.19M 0.07% 114

Other funds holding IRTC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
RTW Investments
RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $44.4B AUM 57.89% 1-Year Est. Return
UBS AM
UBS AM Chicago, Illinois $550B AUM 43.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Deerfield Management's IRTC Position: Q1 2026 in Review

Deerfield Management sold out of iRhythm Holdings (IRTC) in Q1 2026, closing a stake of 12,099 shares — an estimated $2.15M sold.

Deerfield Management first reported a position in IRTC in Q3 2021 and held it in 5 quarters. The position peaked at $14.1M in Q4 2024. 305 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Deerfield Management reported no remaining iRhythm Holdings position as of Q1 2026 after selling out during the quarter.
  • Deerfield Management sold 12,099 iRhythm Holdings shares in Q1 2026, an estimated $2.15M.
  • Deerfield Management first reported a position in iRhythm Holdings in Q3 2021 and held it in 5 quarters.
  • Deerfield Management's iRhythm Holdings position peaked at $14.1M in Q4 2024.
  • 305 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Deerfield Management's 13F filing for Q1 2026, filed 15 May 2026.