Courtesy of EquityClock, the seasonal strength for biotechnology and pharmaceuticals started on August 3. It will run through to November 21.Strategically, stick with biotech stocks that already raised funding, has ample cash, and has a staple of products in the pipeline.Avoid any other biotech stocks promising a breakthrough drug but draining cash on high opex and R&D.Favorites:Ariad Pharmaceuticals (click here)Endo International (ENDP – analysis here)Horizon Pharma ( HZNP )Synergy Pharmaceuticals (SGYP)Nano cap:Kitov Pharmaceuticals (KTOV) $ENDP, Endo International plc / 60