William Blair Investment Management
AEHR icon

William Blair Investment Management’s Aehr Test Systems AEHR Stock Holding History

William Blair Investment Management’s Portfolio AEHR Stock Details AEHR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$19M Buy
513,293
+17,621
+4% +$564K 0.06% 259
2025
Q4 		$10M Sell
495,672
-398,389
-45% -$9.64M 0.03% 316
2025
Q3 		$26.9M Buy
+894,061
New +$19.4M 0.07% 242

Other funds holding AEHR

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
AIC
AWM Investment Company New York $903M AUM 163.47% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
Baillie Gifford & Co
Baillie Gifford & Co Edinburgh, United Kingdom $97.9B AUM 20.73% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
NCGI
Next Century Growth Investors Plymouth, Minnesota $1.38B AUM 102.34% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

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

William Blair Investment Management increased its Aehr Test Systems (AEHR) stake by 3.6% in Q1 2026, buying an estimated $564K and bringing the position to 513,293 shares worth $19M. The position accounts for 0.06% of the portfolio, ranked #259.

William Blair Investment Management first reported a position in AEHR in Q3 2025 and has held it in 3 quarters since. The position peaked at $26.9M in Q3 2025. 191 funds tracked by Wall St. Rank hold AEHR as of Q1 2026.

  • William Blair Investment Management held 513,293 shares of Aehr Test Systems worth $19M as of Q1 2026.
  • William Blair Investment Management bought 17,621 Aehr Test Systems shares in Q1 2026, an estimated $564K.
  • Aehr Test Systems made up 0.06% of William Blair Investment Management's portfolio in Q1 2026, its #259 holding.
  • William Blair Investment Management first reported a position in Aehr Test Systems in Q3 2025 and has held it in 3 quarters since.
  • William Blair Investment Management's Aehr Test Systems position peaked at $26.9M in Q3 2025.
  • 191 funds tracked by Wall St. Rank held Aehr Test Systems as of Q1 2026.

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