Westfield Capital Management
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Westfield Capital Management’s Impinj PI Stock Holding History

Westfield Capital 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 		$38.8M Buy
+270,646
New +$35.3M 0.13% 182
2024
Q3 		– Sell
-274,850
Closed -$43.1M – 276
2024
Q2 		$43.1M Sell
274,850
-100,796
-27% -$15M 0.21% 149
2024
Q1 		$48.2M Sell
375,646
-240,795
-39% -$25.3M 0.25% 139
2023
Q4 		$55.5M Sell
616,441
-405,918
-40% -$29.1M 0.32% 128
2023
Q3 		$56.3M Buy
1,022,359
+292,470
+40% +$19.8M 0.38% 103
2023
Q2 		$65.4M Buy
+729,889
New +$77.8M 0.42% 95

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 $3.37T AUM 44.26% 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

Westfield Capital Management's PI Position: Q2 2026 in Review

Westfield Capital Management opened a new position in Impinj (PI) in Q2 2026: 270,646 shares worth $38.8M. The stake represents 0.13% of the portfolio and ranks #182 among its holdings. This is a return to the name: Westfield Capital Management previously reported a position in PI as recently as Q2 2024.

Westfield Capital Management first reported a position in PI in Q2 2023 and has held it in 6 quarters since. The position peaked at $65.4M in Q2 2023. 317 funds tracked by Wall St. Rank hold PI as of Q2 2026.

  • Westfield Capital Management held 270,646 shares of Impinj worth $38.8M as of Q2 2026.
  • Impinj was a new Westfield Capital Management position in Q2 2026.
  • Impinj made up 0.13% of Westfield Capital Management's portfolio in Q2 2026, its #182 holding.
  • Westfield Capital Management first reported a position in Impinj in Q2 2023 and has held it in 6 quarters since.
  • Westfield Capital Management's Impinj position peaked at $65.4M in Q2 2023.
  • 317 funds tracked by Wall St. Rank held Impinj as of Q2 2026.

Based on Westfield Capital Management's 13F filing for Q2 2026, filed 12 Aug 2026.