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BIIB icon

Tidemark’s Biogen BIIB Stock Holding History

Tidemark’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 		$128K Hold
593
– – 0.03% 201
2026
Q1 		$109K Buy
593
+1
+0.2% +$184 0.03% 192
2025
Q4 		$104K Hold
592
– – 0.03% 181
2025
Q3 		$82.9K Hold
592
– – 0.02% 198
2025
Q2 		$74.3K Hold
592
– – 0.02% 201
2025
Q1 		$81K Hold
592
– – 0.03% 188
2024
Q4 		$90.5K Hold
592
– – 0.03% 178
2024
Q3 		$115K Buy
+592
New +$124K 0.05% 152
2024
Q2 		– Sell
-15
Closed -$3.23K – 632
2024
Q1 		$3.23K Hold
15
– – ﹤0.01% 564
2023
Q4 		$3.88K Buy
+15
New +$3.68K ﹤0.01% 538

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

Tidemark's BIIB Position: Q2 2026 in Review

Tidemark held its Biogen (BIIB) position steady in Q2 2026 at 593 shares worth $128K. The position accounts for 0.03% of the portfolio, ranked #201.

Tidemark first reported a position in BIIB in Q4 2023 and has held it in 10 quarters since. 1,036 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Tidemark held 593 shares of Biogen worth $128K as of Q2 2026.
  • Tidemark left its Biogen share count unchanged in Q2 2026.
  • Biogen made up 0.03% of Tidemark's portfolio in Q2 2026, its #201 holding.
  • Tidemark first reported a position in Biogen in Q4 2023 and has held it in 10 quarters since.
  • 1,036 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Tidemark's 13F filing for Q2 2026, filed 10 Aug 2026.