William Blair Investment Management’s Allison Transmission ALSN Stock Holding History

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

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$535K	Buy	4,746 +20	+0.4%	+$2.43K	﹤0.01%	366
2026 Q1	$553K	Buy	4,726 +119	+3%	+$13.5K	﹤0.01%	371
2025 Q4	$451K	Sell	4,607 -383	-8%	-$33.6K	﹤0.01%	379
2025 Q3	$424K	Sell	4,990 -172	-3%	-$15.3K	﹤0.01%	373
2025 Q2	$490K	Sell	5,162 -81	-2%	-$7.83K	﹤0.01%	376
2025 Q1	$502K	Buy	5,243 +1,492	+40%	+$158K	﹤0.01%	376
2024 Q4	$405K	Sell	3,751 -939	-20%	-$103K	﹤0.01%	404
2024 Q3	$451K	Buy	+4,690	New	+$402K	﹤0.01%	382

Other funds holding ALSN

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

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

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

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return

Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return

LSV Asset Management Chicago, Illinois $55.1B AUM 45.38% 1-Year Est. Return

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

Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

William Blair Investment Management's ALSN Position: Q2 2026 in Review

William Blair Investment Management increased its Allison Transmission (ALSN) stake by 0.42% in Q2 2026, buying an estimated $2.43K and bringing the position to 4,746 shares worth $535K. The position accounts for ﹤0.01% of the portfolio, ranked #366.

William Blair Investment Management first reported a position in ALSN in Q3 2024 and has held it in 8 quarters since. The position peaked at $553K in Q1 2026. 569 funds tracked by Wall St. Rank hold ALSN as of Q2 2026.

William Blair Investment Management held 4,746 shares of Allison Transmission worth $535K as of Q2 2026.
William Blair Investment Management bought 20 Allison Transmission shares in Q2 2026, an estimated $2.43K.
Allison Transmission made up ﹤0.01% of William Blair Investment Management's portfolio in Q2 2026, its #366 holding.
William Blair Investment Management first reported a position in Allison Transmission in Q3 2024 and has held it in 8 quarters since.
William Blair Investment Management's Allison Transmission position peaked at $553K in Q1 2026.
569 funds tracked by Wall St. Rank held Allison Transmission as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.