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Headlands Technologies’s Prothena Corp PRTA Stock Holding History

Headlands Technologies’s Portfolio PRTA Stock Details PRTA Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$148K Buy
+15,077
New +$149K 0.02% 635
2026
Q1 		– Sell
-23,352
Closed -$223K – 921
2025
Q4 		$223K Buy
+23,352
New +$238K 0.02% 570
2025
Q1 		– Sell
-7,330
Closed -$102K – 1437
2024
Q4 		$102K Buy
7,330
+4,858
+197% +$76.6K 0.01% 660
2024
Q3 		$41.4K Buy
2,472
+797
+48% +$17.1K ﹤0.01% 840
2024
Q2 		$34.6K Sell
1,675
-2,206
-57% -$47.7K ﹤0.01% 832
2024
Q1 		$96.1K Buy
+3,881
New +$115K 0.02% 550
2023
Q4 		– Sell
-1,531
Closed -$73.9K – 1229
2023
Q3 		$73.9K Buy
+1,531
New +$91K 0.04% 369

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Headlands Technologies's PRTA Position: Q2 2026 in Review

Headlands Technologies opened a new position in Prothena Corp (PRTA) in Q2 2026: 15,077 shares worth $148K. The stake represents 0.02% of the portfolio and ranks #635 among its holdings. This is a return to the name: Headlands Technologies previously reported a position in PRTA as recently as Q4 2025.

Headlands Technologies first reported a position in PRTA in Q3 2023 and has held it in 7 quarters since. The position peaked at $223K in Q4 2025. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Headlands Technologies held 15,077 shares of Prothena Corp worth $148K as of Q2 2026.
  • Prothena Corp was a new Headlands Technologies position in Q2 2026.
  • Prothena Corp made up 0.02% of Headlands Technologies's portfolio in Q2 2026, its #635 holding.
  • Headlands Technologies first reported a position in Prothena Corp in Q3 2023 and has held it in 7 quarters since.
  • Headlands Technologies's Prothena Corp position peaked at $223K in Q4 2025.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Headlands Technologies's 13F filing for Q2 2026, filed 13 Aug 2026.