Richard Pzena - Pzena Investment Management
Period:    Q1 2026
Portfolio date:    31 Mar 2026
No. of stocks:    158
Portfolio value:    $30,796,447,662
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
2023   Q3 0 0.00 Sell 100.00% <0.01 $251.85–287.60 · VW $267.60i SEC
2023   Q2 1,618 <0.01 Buy <0.01 $273.39–319.76 · VW $297.10i $460,887 SEC
2022   Q4 0 0.00 Sell 100.00% <0.01 $250.31–311.88 · VW $284.08i SEC
2022   Q3 2,384 <0.01 $267.20 $637,000 SEC
2022   Q2 2,384 <0.01 $203.86 $486,000 SEC
2022   Q1 2,384 <0.01 Buy <0.01 $192.67–249.00 · VW $219.53i $502,000 SEC
2020   Q4 0 0.00 Sell 100.00% 0.01 $223.25–363.92 · VW $265.43i SEC
2020   Q3 2,857 0.01 Reduce 11.90% <0.01 $261.87–312.00 · VW $282.52i $810,000 SEC
2020   Q2 3,243 0.01 Reduce 93.12% 0.10 $257.60–350.24 · VW $298.78i $868,000 SEC
2020   Q1 47,151 0.11 Reduce 5.07% <0.01 $262.25–374.99 · VW $302.72i $14,918,000 SEC
2019   Q4 49,670 0.07 Add 1455.59% 0.07 $219.70–318.00 · VW $286.11i $14,739,000 SEC
2019   Q3 3,193 <0.01 Add 37.75% <0.01 $215.78–246.99 · VW $231.92i $743,000 SEC
2019   Q2 2,318 <0.01 Reduce 5.43% <0.01 $219.20–245.35 · VW $230.04i $542,000 SEC
2019   Q1 2,451 <0.01 Add 16.38% <0.01 $216.12–344.00 · VW $288.59i $579,000 SEC
2018   Q4 2,106 <0.01 Add 12.98% <0.01 $278.46–358.41 · VW $315.25i $634,000 SEC
2018   Q3 1,864 <0.01 Add 4.13% <0.01 $288.13–388.67 · VW $341.93i $659,000 SEC
2018   Q2 1,790 <0.01 Add 2.46% <0.01 $249.17–310.91 · VW $282.02i $520,000 SEC
2018   Q1 1,747 <0.01 Add 87.65% <0.01 $259.76–370.57 · VW $306.61i $478,000 SEC
2017   Q4 931 <0.01 Buy <0.01 $301.81–348.84 · VW $320.14i $297,000 SEC
2017   Q2 0 0.00 Sell 100.00% <0.01 $244.28–291.90 · VW $266.52i SEC
2017   Q1 759 <0.01 Buy <0.01 $260.50–301.42 · VW $281.28i $208,000 SEC
2016   Q4 0 0.00 Sell 100.00% <0.01 $268.00–329.83 · VW $292.03i SEC
2016   Q3 642 <0.01 Buy <0.01 $240.07–333.65 · VW $298.36i $201,000 SEC
Price snapshot:
Current price$209.03
52-week low$121.05
52-week high$219.72