Swiss National Bank’s Prothena Corp PRTA Stock Holding History

Swiss National Bank’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
2025 Q3	–	Sell	-56,500	Closed	-$343K	–	2354
2025 Q2	$343K	Sell	56,500 -12,200	-18%	-$91.6K	﹤0.01%	2329
2025 Q1	$850K	Hold	68,700	–	–	﹤0.01%	2200
2024 Q4	$951K	Hold	68,700	–	–	﹤0.01%	2222
2024 Q3	$1.15M	Hold	68,700	–	–	﹤0.01%	2148
2024 Q2	$1.42M	Sell	68,700 -10,500	-13%	-$227K	﹤0.01%	1990
2024 Q1	$1.96M	Hold	79,200	–	–	﹤0.01%	1842
2023 Q4	$2.88M	Sell	79,200 -7,800	-9%	-$300K	﹤0.01%	1634
2023 Q3	$4.2M	Buy	87,000 +1,100	+1%	+$65.4K	﹤0.01%	1381
2023 Q2	$5.87M	Buy	85,900 +12,800	+18%	+$826K	﹤0.01%	1215
2023 Q1	$3.54M	Sell	73,100 -6,200	-8%	-$328K	﹤0.01%	1473
2022 Q4	$4.78M	Buy	79,300 +2,100	+3%	+$123K	﹤0.01%	1340
2022 Q3	$4.68M	Hold	77,200	–	–	﹤0.01%	1324
2022 Q2	$2.1M	Hold	77,200	–	–	﹤0.01%	1881
2022 Q1	$2.82M	Buy	77,200 +7,800	+11%	+$281K	﹤0.01%	1830
2021 Q4	$3.43M	Buy	69,400 +1,100	+2%	+$61K	﹤0.01%	1708
2021 Q3	$4.87M	Buy	68,300 +6,700	+11%	+$416K	﹤0.01%	1481
2021 Q2	$3.17M	Buy	61,600 +2,300	+4%	+$71.8K	﹤0.01%	1803
2021 Q1	$1.49M	Buy	59,300 +1,400	+2%	+$26.3K	﹤0.01%	2168
2020 Q4	$695K	Hold	57,900	–	–	﹤0.01%	2412
2020 Q3	$578K	Hold	57,900	–	–	﹤0.01%	2330
2020 Q2	$606K	Sell	57,900 -19,500	-25%	-$217K	﹤0.01%	2333
2020 Q1	$828K	Buy	77,400 +1,000	+1%	+$12.1K	﹤0.01%	1939
2019 Q4	$1.21M	Buy	76,400 +2,200	+3%	+$23.6K	﹤0.01%	2030
2019 Q3	$582K	Hold	74,200	–	–	﹤0.01%	2307
2019 Q2	$784K	Buy	74,200 +1,600	+2%	+$16.4K	﹤0.01%	2245
2019 Q1	$881K	Buy	72,600 +2,200	+3%	+$27.5K	﹤0.01%	2133
2018 Q4	$725K	Buy	70,400 +4,000	+6%	+$47.5K	﹤0.01%	2179
2018 Q3	$869K	Hold	66,400	–	–	﹤0.01%	2221
2018 Q2	$968K	Hold	66,400	–	–	﹤0.01%	2175
2018 Q1	$2.44M	Hold	66,400	–	–	﹤0.01%	1511
2017 Q4	$2.49M	Buy	66,400 +2,800	+4%	+$143K	﹤0.01%	1501
2017 Q3	$4.12M	Buy	63,600 +1,300	+2%	+$79.6K	﹤0.01%	1140
2017 Q2	$3.37M	Hold	62,300	–	–	﹤0.01%	1246
2017 Q1	$3.48M	Buy	62,300 +14,800	+31%	+$778K	﹤0.01%	1223
2016 Q4	$2.34M	Hold	47,500	–	–	﹤0.01%	1450
2016 Q3	$2.85M	Sell	47,500 -2,400	-5%	-$129K	﹤0.01%	1284
2016 Q2	$1.75M	Buy	49,900 +900	+2%	+$39.2K	﹤0.01%	1599
2016 Q1	$1.95M	Buy	49,000 +6,000	+14%	+$235K	﹤0.01%	1467
2015 Q4	$2.93M	Hold	43,000	–	–	0.01%	1087
2015 Q3	$1.95M	Buy	43,000 +5,700	+15%	+$332K	0.01%	1327
2015 Q2	$1.97M	Buy	37,300 +3,800	+11%	+$150K	0.01%	1319
2015 Q1	$1.28M	Hold	33,500	–	–	﹤0.01%	1605
2014 Q4	$695K	Buy	+33,500	New	+$699K	﹤0.01%	1956

Other funds holding PRTA

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Armistice Capital New York $5.62B AUM 36.06% 1-Year Est. Return

RCMNY

Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return

ACM

ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return

PAI

Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Swiss National Bank's PRTA Position: Q3 2025 in Review

Swiss National Bank sold out of Prothena Corp (PRTA) in Q3 2025, closing a stake of 56,500 shares — an estimated $343K sold.

Swiss National Bank first reported a position in PRTA in Q4 2014 and held it in 43 quarters. The position peaked at $5.87M in Q2 2023. 187 funds tracked by Wall St. Rank hold PRTA as of Q3 2025.

Swiss National Bank reported no remaining Prothena Corp position as of Q3 2025 after selling out during the quarter.
Swiss National Bank sold 56,500 Prothena Corp shares in Q3 2025, an estimated $343K.
Swiss National Bank first reported a position in Prothena Corp in Q4 2014 and held it in 43 quarters.
Swiss National Bank's Prothena Corp position peaked at $5.87M in Q2 2023.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2025.

Based on Swiss National Bank's 13F filing for Q3 2025, filed 13 Nov 2025.