William Blair & Company’s Simpson Manufacturing SSD Stock Holding History

William Blair & Company’s Portfolio SSD Stock Details SSD Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$249K	Buy	+1,448	New	+$267K	﹤0.01%	1398
2025 Q4	–	Sell	-1,208	Closed	-$202K	–	1945
2025 Q3	$202K	Buy	+1,208	New	+$216K	﹤0.01%	1461
2022 Q1	–	Sell	-2,639	Closed	-$367K	–	2000
2021 Q4	$367K	Buy	+2,639	New	+$318K	﹤0.01%	1338
2021 Q3	–	Sell	-1,840	Closed	-$203K	–	1938
2021 Q2	$203K	Buy	+1,840	New	+$203K	﹤0.01%	1500
2014 Q4	–	Sell	-245,798	Closed	-$7.17M	–	2142
2014 Q3	$7.17M	Sell	245,798 -152,255	-38%	-$4.93M	0.01%	938
2014 Q2	$14.5M	Sell	398,053 -76,661	-16%	-$2.61M	0.02%	709
2014 Q1	$16.8M	Buy	474,714 +69,622	+17%	+$2.39M	0.03%	629
2013 Q4	$14.9M	Buy	405,092 +37,246	+10%	+$1.3M	0.02%	652
2013 Q3	$12M	Buy	367,846 +11,480	+3%	+$365K	0.02%	680
2013 Q2	$10.5M	Buy	+356,366	New	+$10.5M	0.02%	704

Other funds holding SSD

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Kayne Anderson Rudnick Investment Management Los Angeles, California $34B AUM 6.31% 1-Year Est. Return

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

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

ValueAct Holdings San Francisco, California $5.71B AUM 7.41% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

BAAM

Baker Avenue Asset Management San Francisco, California $4.43B AUM 26.6% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

William Blair & Company's SSD Position: Q1 2026 in Review

William Blair & Company opened a new position in Simpson Manufacturing (SSD) in Q1 2026: 1,448 shares worth $249K. The stake represents ﹤0.01% of the portfolio and ranks #1398 among its holdings. This is a return to the name: William Blair & Company previously reported a position in SSD as recently as Q3 2025.

William Blair & Company first reported a position in SSD in Q2 2013 and has held it in 10 quarters since. The position peaked at $16.8M in Q1 2014. 460 funds tracked by Wall St. Rank hold SSD as of Q1 2026.

William Blair & Company held 1,448 shares of Simpson Manufacturing worth $249K as of Q1 2026.
Simpson Manufacturing was a new William Blair & Company position in Q1 2026.
Simpson Manufacturing made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1398 holding.
William Blair & Company first reported a position in Simpson Manufacturing in Q2 2013 and has held it in 10 quarters since.
William Blair & Company's Simpson Manufacturing position peaked at $16.8M in Q1 2014.
460 funds tracked by Wall St. Rank held Simpson Manufacturing as of Q1 2026.

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