Spherix enters 2nd agreement with RPX By: MarketMinute.com Stock News May 24, 2016 at 12:19 PM EDT Spherix Inc. (Nasdaq: SPEX) entered a second license agreement with RPX Corp. (Nasdaq: RPXC). Shares of Spherix surged $1.67 to $3.58 while RPX stock eased 3 cents to $9.14. Related Stocks: RPX Corporation - Common Stock