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SummitTX Capital’s Biogen BIIB Stock Holding History

SummitTX Capital’s Portfolio BIIB Stock Details BIIB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$404K Sell
1,872
-19,784
-91% -$3.78M 0.01% 627
2026
Q1 		$3.97M Buy
+21,656
New +$3.99M 0.12% 195
2025
Q4 		– Sell
-17,379
Closed -$2.43M – 709
2025
Q3 		$2.43M Sell
17,379
-37,591
-68% -$5.08M 0.1% 217
2025
Q2 		$6.9M Buy
54,970
+43,288
+371% +$5.39M 0.3% 77
2025
Q1 		$1.6M Buy
+11,682
New +$1.67M 0.07% 292

Other funds holding BIIB

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
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

SummitTX Capital's BIIB Position: Q2 2026 in Review

SummitTX Capital reduced its Biogen (BIIB) stake by 91% in Q2 2026, selling an estimated $3.78M and leaving 1,872 shares worth $404K. The position accounts for 0.01% of the portfolio, ranked #627.

SummitTX Capital first reported a position in BIIB in Q1 2025 and has held it in 5 quarters since. The position peaked at $6.9M in Q2 2025. 1,043 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • SummitTX Capital held 1,872 shares of Biogen worth $404K as of Q2 2026.
  • SummitTX Capital sold 19,784 Biogen shares in Q2 2026, an estimated $3.78M.
  • Biogen made up 0.01% of SummitTX Capital's portfolio in Q2 2026, its #627 holding.
  • SummitTX Capital first reported a position in Biogen in Q1 2025 and has held it in 5 quarters since.
  • SummitTX Capital's Biogen position peaked at $6.9M in Q2 2025.
  • 1,043 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on SummitTX Capital's 13F filing for Q2 2026, filed 14 Aug 2026.