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  • BIOGEN IDEC INC Average Monthly Returns

Some investors consider seasonal performance when purchasing or selling stocks. This chart illustrates the average monthly return for the past 5 years. Users often also consider the number of times a stock increases or decreases for any given month. Mouse-over the chart to view 5 years of history for each month.

  • Seasonality Performance Chart: BIIB

  • Seasonal Performance Data: BIIB

    Returns Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Avg.

    Returns %    		 0.77 -10.10 1.25 -0.56 6.60 -6.75 7.71 1.22 -0.38 -2.07 3.03 0.56
    #Times BIIB Stock Price Increased 56 45 52 44 62 44 60 62 45 52 53 52
    #Times BIIB Stock Price Unchanged 1 1 3 0 0 1 0 0 2 0 0 0
    #Times BIIB Stock Price Decreased 44 50 54 59 44 63 44 49 55 58 50 53
    2009 % 2.14 -5.35 13.86 -7.77 7.14 -12.81 5.32 5.57 0.64 -16.60 — —
    2008 % 7.08 -3.70 5.17 -1.67 3.39 -10.92 24.82 -26.98 -1.25 -15.38 -0.55 12.57
    2007 % -1.72 -6.53 -1.76 6.38 10.61 2.45 3.61 15.14 3.93 12.23 -0.42 -23.20
    2006 % -1.16 5.59 -0.31 -4.77 3.97 -0.59 -9.27 5.11 1.09 6.54 9.79 -5.86
    2005 % -2.47 -40.49 -10.70 5.01 7.89 -11.88 14.05 7.25 -6.30 2.86 5.42 5.77
    2004 % — — — — — — — — — — 0.89 13.51