Mason Hawkins - Southeastern Asset Management
Period:    Q1 2026
Portfolio date:    31 Mar 2026
No. of stocks:    49
Portfolio value:    $2,032,773,449
Holdings Activity Buys Sells    History
Holding/activity history for  Biogen Inc. (BIIB)
← All BIIB superinvestors
Period Shares % of Portfolio Activity % Change to Portfolio Price Value Filing
2022   Q2 0 0.00 Sell 100.00% 3.14 $187.16–225.50 · VW $204.57i SEC
2022   Q1 842,962 3.14 Reduce 1.81% 0.06 $192.67–249.00 · VW $219.53i $177,528,000 SEC
2021   Q4 858,523 3.46 Buy 3.46 $221.72–290.76 · VW $252.61i $205,977,000 SEC
2021   Q2 0 0.00 Sell 100.00% 3.61 $257.03–468.55 · VW $330.25i SEC
2021   Q1 603,890 3.61 Buy 3.61 $238.40–296.38 · VW $272.13i $168,939,000 SEC
Price snapshot:
Current price$209.03
52-week low$121.05
52-week high$219.72