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UBS O'Connor’s Pfizer PFE Stock Holding History

UBS O'Connor’s Portfolio PFE Stock Details PFE Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		$2.56M Buy
+102,623
New +$2.59M 0.07% 88
2015
Q1 		– Sell
-12,362
Closed -$365K – 849
2014
Q4 		$365K Buy
+12,362
New +$354K 0.01% 500
2013
Q3 		– Sell
-6,269,077
Closed -$167M – 531
2013
Q2 		$167M Buy
+6,269,077
New +$173M 3.12% 1

Other funds holding PFE

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 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
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Northern Trust
Northern Trust Chicago, Illinois $860B AUM 41.15% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return
State Farm Mutual Automobile Insurance
State Farm Mutual Automobile Insurance Bloomington, Illinois $146B AUM 55.73% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

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

UBS O'Connor opened a new position in Pfizer (PFE) in Q4 2025: 102,623 shares worth $2.56M. The stake represents 0.07% of the portfolio and ranks #88 among its holdings. This is a return to the name: UBS O'Connor previously reported a position in PFE as recently as Q4 2014.

UBS O'Connor first reported a position in PFE in Q2 2013 and has held it in 3 quarters since. The position peaked at $167M in Q2 2013. 2,915 funds tracked by Wall St. Rank hold PFE as of Q4 2025.

  • UBS O'Connor held 102,623 shares of Pfizer worth $2.56M as of Q4 2025.
  • Pfizer was a new UBS O'Connor position in Q4 2025.
  • Pfizer made up 0.07% of UBS O'Connor's portfolio in Q4 2025, its #88 holding.
  • UBS O'Connor first reported a position in Pfizer in Q2 2013 and has held it in 3 quarters since.
  • UBS O'Connor's Pfizer position peaked at $167M in Q2 2013.
  • 2,915 funds tracked by Wall St. Rank held Pfizer as of Q4 2025.

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