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Plato Investment Management’s Biogen BIIB Stock Holding History

Plato Investment Management’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 		$1.49M Buy
6,938
+1,999
+40% +$382K 0.09% 214
2026
Q1 		$906K Hold
4,939
– – 0.06% 275
2025
Q4 		$873K Hold
4,939
– – 0.06% 283
2025
Q3 		$687K Hold
4,939
– – 0.05% 315
2025
Q2 		$618K Buy
4,939
+3,869
+362% +$482K 0.05% 318
2025
Q1 		$148K Buy
1,070
+33
+3% +$4.72K 0.01% 403
2024
Q4 		$159K Buy
+1,037
New +$175K 0.01% 425
2024
Q3 		– Sell
-50
Closed -$11.6K – 550
2024
Q2 		$11.6K Sell
50
-67
-57% -$14.6K ﹤0.01% 444
2024
Q1 		$25.2K Buy
117
+53
+83% +$12.4K ﹤0.01% 404
2023
Q4 		$16.6K Buy
+64
New +$15.7K 0.02% 330

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 $3.38T AUM 44.17% 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

Plato Investment Management's BIIB Position: Q2 2026 in Review

Plato Investment Management increased its Biogen (BIIB) stake by 40% in Q2 2026, buying an estimated $382K and bringing the position to 6,938 shares worth $1.49M. The position accounts for 0.09% of the portfolio, ranked #214.

Plato Investment Management first reported a position in BIIB in Q4 2023 and has held it in 10 quarters since. 1,046 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Plato Investment Management held 6,938 shares of Biogen worth $1.49M as of Q2 2026.
  • Plato Investment Management bought 1,999 Biogen shares in Q2 2026, an estimated $382K.
  • Biogen made up 0.09% of Plato Investment Management's portfolio in Q2 2026, its #214 holding.
  • Plato Investment Management first reported a position in Biogen in Q4 2023 and has held it in 10 quarters since.
  • 1,046 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Plato Investment Management's 13F filing for Q2 2026, filed 7 Aug 2026.