declaration and payment of future quarterly dividends is at the discretion of our board and may be adjusted as business needs or market conditions change . in addition , under the terms of the merger agreement , we have agreed with aetna to coordinate the declaration and payment of dividends so that our stockholders do not fail to receive a quarterly dividend around the time of the closing of the merger . on october 29 , 2015 , the board declared a cash dividend of $ 0.29 per share that was paid on january 29 , 2016 to stockholders of record on december 30 , 2015 , for an aggregate amount of $ 43 million . stock total return performance the following graph compares our total return to stockholders with the returns of the standard & poor 2019s composite 500 index ( 201cs&p 500 201d ) and the dow jones us select health care providers index ( 201cpeer group 201d ) for the five years ended december 31 , 2015 . the graph assumes an investment of $ 100 in each of our common stock , the s&p 500 , and the peer group on december 31 , 2010 , and that dividends were reinvested when paid. .
the stock price performance included in this graph is not necessarily indicative of future stock price performance. .
12/31/2010 12/31/2011 12/31/2012 12/31/2013 12/31/2014 12/31/2015
HUM $100 $162 $128 $195 $274 $343
S&P 500 $100 $102 $118 $157 $178 $181
Peer Group $100 $110 $129 $177 $226 $239
12/31/2010 12/31/2011 12/31/2012 12/31/2013 12/31/2014 12/31/2015
hum $ 100 $ 162 $ 128 $ 195 $ 274 $ 343
s&p 500 $ 100 $ 102 $ 118 $ 157 $ 178 $ 181
peer group $ 100 $ 110 $ 129 $ 177 $ 226 $ 239