if you call it back it says fisher investments and to leave a message. I really have no clue, but if they call and hang up, it may be an auto dialer that validates whether a given number is active and they sell that information to someone. Or, perhaps they got your number from some other mechanism.
I see another similar thread here:
http://whocallsme.com/Phone-Number.aspx/6503505950
Received a missed call from 650-350-5912. Googled it and found this reporting web site. As others have said, when I called back the recording says Fisher Investments, leave your full contact info. Saving it on my phone as DNA (do not answer) and number x in a growing line.
Annoying as I am job hunting and you never know who's important call you missed.