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SIG Brokerage’s Biogen BIIB Stock Holding History

SIG Brokerage’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 		$1.47M Buy
6,824
+1,324
+24% +$253K 0.03% 394
2026
Q1 		$1.01M Sell
5,500
-5,422
-50% -$999K 0.03% 419
2025
Q4 		$1.92M Buy
10,922
+6,141
+128% +$1M 0.06% 244
2025
Q3 		$670K Buy
4,781
+1,402
+41% +$190K 0.02% 466
2025
Q2 		$424K Sell
3,379
-846
-20% -$105K 0.01% 508
2025
Q1 		$578K Sell
4,225
-186
-4% -$26.6K 0.03% 334
2024
Q4 		$675K Buy
+4,411
New +$744K 0.04% 293

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

SIG Brokerage's BIIB Position: Q2 2026 in Review

SIG Brokerage increased its Biogen (BIIB) stake by 24% in Q2 2026, buying an estimated $253K and bringing the position to 6,824 shares worth $1.47M. The position accounts for 0.03% of the portfolio, ranked #394.

SIG Brokerage first reported a position in BIIB in Q4 2024 and has held it in 7 quarters since. The position peaked at $1.92M in Q4 2025. 1,043 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • SIG Brokerage held 6,824 shares of Biogen worth $1.47M as of Q2 2026.
  • SIG Brokerage bought 1,324 Biogen shares in Q2 2026, an estimated $253K.
  • Biogen made up 0.03% of SIG Brokerage's portfolio in Q2 2026, its #394 holding.
  • SIG Brokerage first reported a position in Biogen in Q4 2024 and has held it in 7 quarters since.
  • SIG Brokerage's Biogen position peaked at $1.92M in Q4 2025.
  • 1,043 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on SIG Brokerage's 13F filing for Q2 2026, filed 14 Aug 2026.