Oberweis Asset Management’s iRhythm Holdings IRTC Stock Holding History

Oberweis Asset 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 Q2	$24M	Buy	202,004 +46,000	+29%	+$5.35M	0.5%	73
2026 Q1	$18.4M	Buy	156,004 +36,304	+30%	+$5.24M	0.54%	68
2025 Q4	$21.2M	Buy	119,700 +38,500	+47%	+$6.82M	0.78%	45
2025 Q3	$14M	Hold	81,200	–	–	0.53%	72
2025 Q2	$12.5M	Buy	+81,200	New	+$10.5M	0.54%	71
2019 Q4	–	Sell	-3,700	Closed	-$274K	–	210
2019 Q3	$274K	Sell	3,700 -50,940	-93%	-$3.95M	0.06%	174
2019 Q2	$4.32M	Sell	54,640 -6,070	-10%	-$442K	0.79%	30
2019 Q1	$4.55M	Buy	+60,710	New	+$5.19M	0.91%	32

Other funds holding IRTC

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

UBS AM Chicago, Illinois $550B AUM 43.33% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

EAM

Eventide Asset Management Boston, Massachusetts $7.48B AUM 104.76% 1-Year Est. Return

Oberweis Asset Management's IRTC Position: Q2 2026 in Review

Oberweis Asset Management increased its iRhythm Holdings (IRTC) stake by 29% in Q2 2026, buying an estimated $5.35M and bringing the position to 202,004 shares worth $24M. The position accounts for 0.5% of the portfolio, ranked #73.

Oberweis Asset Management first reported a position in IRTC in Q1 2019 and has held it in 8 quarters since. 304 funds tracked by Wall St. Rank hold IRTC as of Q2 2026.

Oberweis Asset Management held 202,004 shares of iRhythm Holdings worth $24M as of Q2 2026.
Oberweis Asset Management bought 46,000 iRhythm Holdings shares in Q2 2026, an estimated $5.35M.
iRhythm Holdings made up 0.5% of Oberweis Asset Management's portfolio in Q2 2026, its #73 holding.
Oberweis Asset Management first reported a position in iRhythm Holdings in Q1 2019 and has held it in 8 quarters since.
304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q2 2026.

Based on Oberweis Asset Management's 13F filing for Q2 2026, filed 14 Aug 2026.