UBS O'Connor’s Tower Semiconductor TSEM Stock Holding History

UBS O'Connor’s Portfolio TSEM Stock Details TSEM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q4	$1.5M	Sell	12,739 -26,305	-67%	-$2.53M	0.04%	126
2025 Q3	$2.82M	Buy	+39,044	New	+$2.13M	0.09%	101
2023 Q3	–	Sell	-675,000	Closed	-$25.3M	–	626
2023 Q2	$25.3M	Sell	675,000 -1,227,725	-65%	-$50.8M	0.53%	27
2023 Q1	$80.8M	Buy	1,902,725 +189,190	+11%	+$7.9M	1.92%	9
2022 Q4	$74M	Sell	1,713,535 -46,092	-3%	-$2M	4.86%	8
2022 Q3	$77.3M	Buy	1,759,627 +106,739	+6%	+$4.92M	0.88%	20
2022 Q2	$76.3M	Buy	1,652,888 +252,888	+18%	+$12M	0.79%	22
2022 Q1	$67.8M	Buy	+1,400,000	New	+$59.1M	13.66%	3

Other funds holding TSEM

Clal Insurance Tel-Aviv, Israel $16.6B AUM 68.34% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

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

Senvest Management New York $3.01B AUM 35.7% 1-Year Est. Return

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

Phoenix Financial Givatayim, Israel $10.5B AUM 49.21% 1-Year Est. Return

UIM

USS Investment Management London, United Kingdom $25.6B AUM 30.22% 1-Year Est. Return

MIFH

Migdal Insurance & Financial Holdings Petach Tikva, Israel $11.5B AUM 52.5% 1-Year Est. Return

HIIFS

Harel Insurance Investments & Financial Services Ramat Gan, Israel $20.6B AUM 59.59% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

UBS O'Connor's TSEM Position: Q4 2025 in Review

UBS O'Connor reduced its Tower Semiconductor (TSEM) stake by 67% in Q4 2025, selling an estimated $2.53M and leaving 12,739 shares worth $1.5M. The position accounts for 0.04% of the portfolio, ranked #126.

UBS O'Connor first reported a position in TSEM in Q1 2022 and has held it in 8 quarters since. The position peaked at $80.8M in Q1 2023. 311 funds tracked by Wall St. Rank hold TSEM as of Q4 2025.

UBS O'Connor held 12,739 shares of Tower Semiconductor worth $1.5M as of Q4 2025.
UBS O'Connor sold 26,305 Tower Semiconductor shares in Q4 2025, an estimated $2.53M.
Tower Semiconductor made up 0.04% of UBS O'Connor's portfolio in Q4 2025, its #126 holding.
UBS O'Connor first reported a position in Tower Semiconductor in Q1 2022 and has held it in 8 quarters since.
UBS O'Connor's Tower Semiconductor position peaked at $80.8M in Q1 2023.
311 funds tracked by Wall St. Rank held Tower Semiconductor as of Q4 2025.

Based on UBS O'Connor's 13F filing for Q4 2025, filed 13 Feb 2026.