William Blair Investment Management
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William Blair Investment Management’s iRhythm Holdings IRTC Stock Holding History

William Blair Investment 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
2022
Q4 		– Sell
-64,132
Closed -$8.03M – 409
2022
Q3 		$8.03M Buy
+64,132
New +$9.26M 0.03% 311
2020
Q4 		– Sell
-1,071,182
Closed -$255M – 358
2020
Q3 		$255M Sell
1,071,182
-354,848
-25% -$62.8M 0.99% 20
2020
Q2 		$165M Sell
1,426,030
-6,173
-0.4% -$681K 0.67% 56
2020
Q1 		$117M Buy
1,432,203
+198,149
+16% +$16.4M 0.57% 57
2019
Q4 		$84M Buy
+1,234,054
New +$83.7M 0.33% 97

Other funds holding IRTC

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Sands Capital Management
Sands Capital Management Arlington, Virginia $26.9B AUM 34.44% 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
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
LOM
LTS One Management New York $251M AUM 20.18% 1-Year Est. Return
Mackenzie Financial
Mackenzie Financial Toronto Ontario, Ontario, Canada $100B AUM 36.93% 1-Year Est. Return
AllianceBernstein
AllianceBernstein Nashville, Tennessee $302B AUM 26.44% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
William Blair & Company
William Blair & Company Chicago, Illinois $38.4B AUM 25.71% 1-Year Est. Return

William Blair Investment Management's IRTC Position: Q4 2022 in Review

William Blair Investment Management sold out of iRhythm Holdings (IRTC) in Q4 2022, closing a stake of 64,132 shares — an estimated $8.03M sold.

William Blair Investment Management first reported a position in IRTC in Q4 2019 and held it in 5 quarters. The position peaked at $255M in Q3 2020. 206 funds tracked by Wall St. Rank hold IRTC as of Q4 2022.

  • William Blair Investment Management reported no remaining iRhythm Holdings position as of Q4 2022 after selling out during the quarter.
  • William Blair Investment Management sold 64,132 iRhythm Holdings shares in Q4 2022, an estimated $8.03M.
  • William Blair Investment Management first reported a position in iRhythm Holdings in Q4 2019 and held it in 5 quarters.
  • William Blair Investment Management's iRhythm Holdings position peaked at $255M in Q3 2020.
  • 206 funds tracked by Wall St. Rank held iRhythm Holdings as of Q4 2022.

Based on William Blair Investment Management's 13F filing for Q4 2022, filed 9 Feb 2023.