Sigma Designs (SIGM) shares are rallying today on no news or analyst moves that I’ve found so far. The stock today is up $2.18, or 11.8%, to $20.61. SIGM has now rallied 32% since its massive one-day fall on April 15, after a negative research note on the company from Robert W. Baird analyst Tristan Gerra. Gerra’s note, which said rival Broadcom (BRCM) has won the right to provide chips to Motorola’s (MOT) second-generation IPTV set-top box for systems based on Microsoft’s (MSFT) Mediaroom platform, sent the stock to a one-day loss of $5.36, or 25.5%. It has now made up most of that decline.

Any other thoughts on today’s rise?