William Blair Investment Management
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William Blair Investment Management’s Impinj PI Stock Holding History

William Blair Investment Management’s Portfolio PI Stock Details PI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$26.3M Buy
256,211
+44,208
+21% +$5.88M 0.09% 213
2025
Q4 		$36.9M Buy
212,003
+11,398
+6% +$2.03M 0.1% 169
2025
Q3 		$36.3M Buy
+200,605
New +$31.6M 0.09% 172

Other funds holding PI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
SC
Sylebra Capital Palo Alto, California $774M AUM 56.69% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
Ameriprise
Ameriprise Minneapolis, Minnesota $432B AUM 30.22% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

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

William Blair Investment Management increased its Impinj (PI) stake by 21% in Q1 2026, buying an estimated $5.88M and bringing the position to 256,211 shares worth $26.3M. The position accounts for 0.09% of the portfolio, ranked #213.

William Blair Investment Management first reported a position in PI in Q3 2025 and has held it in 3 quarters since. The position peaked at $36.9M in Q4 2025. 290 funds tracked by Wall St. Rank hold PI as of Q1 2026.

  • William Blair Investment Management held 256,211 shares of Impinj worth $26.3M as of Q1 2026.
  • William Blair Investment Management bought 44,208 Impinj shares in Q1 2026, an estimated $5.88M.
  • Impinj made up 0.09% of William Blair Investment Management's portfolio in Q1 2026, its #213 holding.
  • William Blair Investment Management first reported a position in Impinj in Q3 2025 and has held it in 3 quarters since.
  • William Blair Investment Management's Impinj position peaked at $36.9M in Q4 2025.
  • 290 funds tracked by Wall St. Rank held Impinj as of Q1 2026.

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