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Driehaus Capital Management’s iRhythm Holdings IRTC Stock Holding History

Driehaus Capital 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
-267,968
Closed -$47.5M – 408
2025
Q4 		$47.5M Buy
267,968
+49,545
+23% +$8.78M 0.32% 104
2025
Q3 		$37.6M Buy
218,423
+56,777
+35% +$9.02M 0.27% 125
2025
Q2 		$24.9M Buy
+161,646
New +$20.9M 0.2% 152
2019
Q4 		– Sell
-56,635
Closed -$4.2M – 531
2019
Q3 		$4.2M Sell
56,635
-40,319
-42% -$3.12M 0.14% 179
2019
Q2 		$7.67M Buy
96,954
+3,497
+4% +$255K 0.24% 116
2019
Q1 		$7.01M Sell
93,457
-124,034
-57% -$10.6M 0.26% 110
2018
Q4 		$15.1M Sell
217,491
-76,780
-26% -$5.82M 0.65% 38
2018
Q3 		$27.9M Buy
294,271
+61,009
+26% +$5.31M 0.86% 17
2018
Q2 		$18.9M Sell
233,262
-28,467
-11% -$1.99M 0.64% 24
2018
Q1 		$16.5M Buy
261,729
+15,617
+6% +$967K 0.58% 39
2017
Q4 		$13.8M Buy
246,112
+8,221
+3% +$430K 0.52% 39
2017
Q3 		$12.3M Buy
237,891
+28,910
+14% +$1.31M 0.48% 49
2017
Q2 		$8.88M Buy
208,981
+77,074
+58% +$2.81M 0.33% 62
2017
Q1 		$4.96M Buy
131,907
+5,111
+4% +$176K 0.17% 139
2016
Q4 		$3.8M Buy
+126,796
New +$3.42M 0.13% 166

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
RI
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

Driehaus Capital Management's IRTC Position: Q1 2026 in Review

Driehaus Capital Management sold out of iRhythm Holdings (IRTC) in Q1 2026, closing a stake of 267,968 shares — an estimated $47.5M sold.

Driehaus Capital Management first reported a position in IRTC in Q4 2016 and held it in 15 quarters. The position peaked at $47.5M in Q4 2025. 305 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Driehaus Capital Management reported no remaining iRhythm Holdings position as of Q1 2026 after selling out during the quarter.
  • Driehaus Capital Management sold 267,968 iRhythm Holdings shares in Q1 2026, an estimated $47.5M.
  • Driehaus Capital Management first reported a position in iRhythm Holdings in Q4 2016 and held it in 15 quarters.
  • Driehaus Capital Management's iRhythm Holdings position peaked at $47.5M in Q4 2025.
  • 305 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

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