Fusion-io floats with corporate backers including Dell Ventures, Sumitomo Ventures and reportedly Samsung Ventures.

Computer data storage company Fusion-io made 18% gains during its first day of trading yesterday, with previous corporate backers including Dell Ventures, Sumitomo Ventures and reportedly Samsung Ventures.

It is unclear what paper or real gains Samsung, Dell or Sumitomo have made on their initial investments in Fusion-io, or whether they still hold stock. Sumitomo, Dell and Samsung did not respond to requests for comment.

US social network Facebook is a big customer of Fusion-io, which relocates important data for…