William Blair Investment Management
PI icon

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
Q2 		$42.5M Buy
296,821
+40,610
+16% +$5.3M 0.13% 163
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

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
SC
Sylebra Capital Palo Alto, California $945M AUM 22.34% 1-Year Est. Return

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

William Blair Investment Management increased its Impinj (PI) stake by 16% in Q2 2026, buying an estimated $5.3M and bringing the position to 296,821 shares worth $42.5M. The position accounts for 0.13% of the portfolio, ranked #163.

William Blair Investment Management first reported a position in PI in Q3 2025 and has held it in 4 quarters since. 316 funds tracked by Wall St. Rank hold PI as of Q2 2026.

  • William Blair Investment Management held 296,821 shares of Impinj worth $42.5M as of Q2 2026.
  • William Blair Investment Management bought 40,610 Impinj shares in Q2 2026, an estimated $5.3M.
  • Impinj made up 0.13% of William Blair Investment Management's portfolio in Q2 2026, its #163 holding.
  • William Blair Investment Management first reported a position in Impinj in Q3 2025 and has held it in 4 quarters since.
  • 316 funds tracked by Wall St. Rank held Impinj as of Q2 2026.

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