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UBS O'Connor’s iRhythm Holdings IRTC Stock Holding History

UBS O'Connor’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
2025
Q3 		– Sell
-7,993
Closed -$1.23M – 372
2025
Q2 		$1.23M Sell
7,993
-5,513
-41% -$712K 0.03% 190
2025
Q1 		$1.41M Sell
13,506
-5,685
-30% -$602K 0.03% 153
2024
Q4 		$1.73M Sell
19,191
-5,535
-22% -$435K 0.04% 172
2024
Q3 		$1.84M Buy
24,726
+6,379
+35% +$508K 0.05% 188
2024
Q2 		$1.97M Sell
18,347
-600
-3% -$61.3K 0.06% 195
2024
Q1 		$2.2M Sell
18,947
-1,400
-7% -$157K 0.06% 159
2023
Q4 		$2.18M Sell
20,347
-811
-4% -$70.7K 0.07% 160
2023
Q3 		$1.99M Buy
21,158
+8,629
+69% +$877K 0.04% 240
2023
Q2 		$1.31M Sell
12,529
-3,186
-20% -$383K 0.03% 355
2023
Q1 		$1.95M Buy
+15,715
New +$1.7M 0.05% 318

Other funds holding IRTC

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return
Sands Capital Management
Sands Capital Management Arlington, Virginia $26.9B AUM 34.44% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
William Blair & Company
William Blair & Company Chicago, Illinois $38.4B AUM 25.71% 1-Year Est. Return
EAM
Eventide Asset Management Boston, Massachusetts $7.48B AUM 104.76% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

UBS O'Connor's IRTC Position: Q3 2025 in Review

UBS O'Connor sold out of iRhythm Holdings (IRTC) in Q3 2025, closing a stake of 7,993 shares — an estimated $1.23M sold.

UBS O'Connor first reported a position in IRTC in Q1 2023 and held it in 10 quarters. The position peaked at $2.2M in Q1 2024. 337 funds tracked by Wall St. Rank hold IRTC as of Q3 2025.

  • UBS O'Connor reported no remaining iRhythm Holdings position as of Q3 2025 after selling out during the quarter.
  • UBS O'Connor sold 7,993 iRhythm Holdings shares in Q3 2025, an estimated $1.23M.
  • UBS O'Connor first reported a position in iRhythm Holdings in Q1 2023 and held it in 10 quarters.
  • UBS O'Connor's iRhythm Holdings position peaked at $2.2M in Q1 2024.
  • 337 funds tracked by Wall St. Rank held iRhythm Holdings as of Q3 2025.

Based on UBS O'Connor's 13F filing for Q3 2025, filed 14 Nov 2025.