State of Wisconsin Investment Board
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State of Wisconsin Investment Board’s iRhythm Holdings IRTC Stock Holding History

State of Wisconsin Investment Board’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 		$5.67M Sell
48,050
-3,103
-6% -$448K 0.01% 932
2025
Q4 		$9.08M Sell
51,153
-9,071
-15% -$1.61M 0.02% 728
2025
Q3 		$10.4M Sell
60,224
-8,251
-12% -$1.31M 0.02% 626
2025
Q2 		$10.5M Sell
68,475
-6,565
-9% -$848K 0.03% 614
2025
Q1 		$7.86M Buy
75,040
+624
+0.8% +$66.1K 0.02% 736
2024
Q4 		$6.71M Buy
74,416
+3,836
+5% +$301K 0.02% 826
2024
Q3 		$5.24M Buy
70,580
+669
+1% +$53.3K 0.01% 936
2024
Q2 		$7.53M Buy
69,911
+1,456
+2% +$149K 0.02% 746
2024
Q1 		$7.94M Sell
68,455
-8,382
-11% -$942K 0.02% 747
2023
Q4 		$8.22M Buy
76,837
+23,587
+44% +$2.06M 0.02% 733
2023
Q3 		$5.02M Buy
53,250
+6,081
+13% +$618K 0.02% 920
2023
Q2 		$4.92M Sell
47,169
-1,385
-3% -$166K 0.01% 978
2023
Q1 		$6.02M Sell
48,554
-5,889
-11% -$639K 0.02% 858
2022
Q4 		$5.1M Sell
54,443
-1,809
-3% -$197K 0.02% 929
2022
Q3 		$7.05M Sell
56,252
-1,804
-3% -$260K 0.02% 750
2022
Q2 		$6.27M Sell
58,056
-2,444
-4% -$324K 0.02% 881
2022
Q1 		$9.53M Hold
60,500
– – 0.02% 816
2021
Q4 		$7.12M Hold
60,500
– – 0.01% 906
2021
Q3 		$3.54M Hold
60,500
– – 0.01% 1144
2021
Q2 		$4.01M Sell
60,500
-2,300
-4% -$182K 0.01% 1113
2021
Q1 		$8.72M Buy
62,800
+900
+1% +$161K 0.02% 800
2020
Q4 		$14.7M Sell
61,900
-6,100
-9% -$1.39M 0.03% 528
2020
Q3 		$16.2M Sell
68,000
-12,000
-15% -$2.12M 0.04% 446
2020
Q2 		$9.27M Hold
80,000
– – 0.03% 623
2020
Q1 		$6.51M Hold
80,000
– – 0.02% 666
2019
Q4 		$5.45M Hold
80,000
– – 0.01% 913
2019
Q3 		$5.93M Hold
80,000
– – 0.02% 780
2019
Q2 		$6.33M Buy
+80,000
New +$5.83M 0.02% 761

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

State of Wisconsin Investment Board's IRTC Position: Q1 2026 in Review

State of Wisconsin Investment Board reduced its iRhythm Holdings (IRTC) stake by 6.1% in Q1 2026, selling an estimated $448K and leaving 48,050 shares worth $5.67M. The position accounts for 0.01% of the portfolio, ranked #932.

State of Wisconsin Investment Board first reported a position in IRTC in Q2 2019 and has held it in 28 quarters since. The position peaked at $16.2M in Q3 2020. 304 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • State of Wisconsin Investment Board held 48,050 shares of iRhythm Holdings worth $5.67M as of Q1 2026.
  • State of Wisconsin Investment Board sold 3,103 iRhythm Holdings shares in Q1 2026, an estimated $448K.
  • iRhythm Holdings made up 0.01% of State of Wisconsin Investment Board's portfolio in Q1 2026, its #932 holding.
  • State of Wisconsin Investment Board first reported a position in iRhythm Holdings in Q2 2019 and has held it in 28 quarters since.
  • State of Wisconsin Investment Board's iRhythm Holdings position peaked at $16.2M in Q3 2020.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on State of Wisconsin Investment Board's 13F filing for Q1 2026, filed 15 May 2026.