Driehaus Capital Management’s iRhythm Holdings IRTC Stock Holding History

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	–	532
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