William Blair Investment Management
QTRX icon

William Blair Investment Management’s Quanterix QTRX Stock Holding History

William Blair Investment Management’s Portfolio QTRX Stock Details QTRX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		– Sell
-2,083,699
Closed -$7.33M – 435
2026
Q1 		$7.33M Buy
2,083,699
+37,250
+2% +$217K 0.02% 323
2025
Q4 		$13M Buy
2,046,449
+731,169
+56% +$4.54M 0.04% 300
2025
Q3 		$7.14M Buy
1,315,280
+187,299
+17% +$996K 0.02% 329
2025
Q2 		$7.5M Buy
1,127,981
+21,918
+2% +$122K 0.02% 334
2025
Q1 		$7.2M Buy
1,106,063
+43,958
+4% +$367K 0.02% 333
2024
Q4 		$11.3M Buy
+1,062,105
New +$12.9M 0.03% 339

Other funds holding QTRX

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
BWLSA
Blue Water Life Science Advisors Larkspur, California $159M AUM 139.66% 1-Year Est. Return
First Eagle Investment Management
First Eagle Investment Management New York $60.8B AUM 26.63% 1-Year Est. Return
PCM
Portolan Capital Management Boston, Massachusetts $2.67B AUM 169.09% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
LCM
Lionhunter Capital Management New York $222M AUM
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Ameriprise
Ameriprise Minneapolis, Minnesota $495B AUM 43.24% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return

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

William Blair Investment Management sold out of Quanterix (QTRX) in Q2 2026, closing a stake of 2,083,699 shares — an estimated $7.33M sold.

William Blair Investment Management first reported a position in QTRX in Q4 2024 and held it in 6 quarters. The position peaked at $13M in Q4 2025. 133 funds tracked by Wall St. Rank hold QTRX as of Q2 2026.

  • William Blair Investment Management reported no remaining Quanterix position as of Q2 2026 after selling out during the quarter.
  • William Blair Investment Management sold 2,083,699 Quanterix shares in Q2 2026, an estimated $7.33M.
  • William Blair Investment Management first reported a position in Quanterix in Q4 2024 and held it in 6 quarters.
  • William Blair Investment Management's Quanterix position peaked at $13M in Q4 2025.
  • 133 funds tracked by Wall St. Rank held Quanterix as of Q2 2026.

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