William Blair Investment Management’s Mirum Pharmaceuticals MIRM Stock Holding History

William Blair Investment Management’s Portfolio MIRM Stock Details MIRM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$31M	Sell	335,669 -1,032	-0.3%	-$97.1K	0.1%	185
2025 Q4	$26.6M	Buy	336,701 +23,442	+7%	+$1.68M	0.07%	228
2025 Q3	$23M	Buy	+313,259	New	+$19.9M	0.06%	276
2024 Q3	–	Sell	-677,939	Closed	-$23.2M	–	432
2024 Q2	$23.2M	Buy	677,939 +50,667	+8%	+$1.33M	0.06%	283
2024 Q1	$15.8M	Buy	627,272 +5,494	+0.9%	+$151K	0.04%	314
2023 Q4	$18.4M	Buy	621,778 +88,085	+17%	+$2.67M	0.05%	297
2023 Q3	$16.9M	Buy	533,693 +196,279	+58%	+$5.37M	0.06%	293
2023 Q2	$8.73M	Buy	+337,414	New	+$8.97M	0.03%	324

Other funds holding MIRM

FLSM

Frazier Life Sciences Management Palo Alto, California $3.89B AUM 201.1% 1-Year Est. Return

Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return

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

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

BVF Inc San Francisco, California $3.14B AUM 249.53% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

EAM

Eventide Asset Management Boston, Massachusetts $6.05B AUM 76.64% 1-Year Est. Return

William Blair Investment Management's MIRM Position: Q1 2026 in Review

William Blair Investment Management reduced its Mirum Pharmaceuticals (MIRM) stake by 0.31% in Q1 2026, selling an estimated $97.1K and leaving 335,669 shares worth $31M. The position accounts for 0.1% of the portfolio, ranked #185.

William Blair Investment Management first reported a position in MIRM in Q2 2023 and has held it in 8 quarters since. 311 funds tracked by Wall St. Rank hold MIRM as of Q1 2026.

William Blair Investment Management held 335,669 shares of Mirum Pharmaceuticals worth $31M as of Q1 2026.
William Blair Investment Management sold 1,032 Mirum Pharmaceuticals shares in Q1 2026, an estimated $97.1K.
Mirum Pharmaceuticals made up 0.1% of William Blair Investment Management's portfolio in Q1 2026, its #185 holding.
William Blair Investment Management first reported a position in Mirum Pharmaceuticals in Q2 2023 and has held it in 8 quarters since.
311 funds tracked by Wall St. Rank held Mirum Pharmaceuticals as of Q1 2026.

Based on William Blair Investment Management's 13F filing for Q1 2026, filed 8 May 2026.