By Medha Singh (Reuters) -Shares of Bed Bath & Beyond shares surged on Wednesday as individual investors piled in, extending the stock’s rebound from multi-decade lows hit last week and reviving a rally in other meme stocks. Among the top three companies traded on Fidelity’s retail platform, Bed Bath & Beyond jumped 69% during the session and then another 20% after the bell. Including those late gains, it has more than tripled so far this week. Other popular stocks among retail traders also rose, with GameStop up 7% and AMC Entertainment surging 21%. On Tuesday, Bed Bath & Beyond said it would…