Cytokinetics ( CYTK) soared 19% after it announced it will partner with fellow California biotech Amgen ( AMGN) in a $75 million cash-and-stock deal for the development of small-molecule heart-failure treatments. Cytokinetics shares were trading up $1.42 to $8.90. Amgen shares were rising $1, or 1.5%, to $69.31. PFSweb ( PFSW) shares swelled on word Riverbed Technology ( RVBD) had hired the Texas-based outsourcer to perform, among other things, final product assembly for Riverbed's wide-area data services product lines. PFSweb shares were jumping 30 cents, or 27.3%, to $1.40. Riverbed was up 55 cents, or 1.8%, to $31.25. Agilysys ( AGYS) surged after saying it will sell its KeyLink Systems Group subsidiary to Arrow Electronics ( ARW) for $485 million. The transaction will probably close by March 31. The Boca Raton, Fla.-based company will also buy back up to 6 million shares as soon as possible after the KeyLink transaction closes. Agilysys shares were up $3.17, or 18.9%, to $19.91. Arrow shares were adding 88 cents, or 2.8%, to $32.43.