GoPro's 82% jump on its merger with Starman Optical leaves 28% of the share price riding on a private transceiver maker with no published revenue. Holders get $1.14 in cash and keep about 10% of the combined company, so at $1.59 the market values that stub near $113m. GoPro's revenue fell 31% to $105m, and the release does not say where Starman's $377m comes from. The stock also jumped 46% on heavy volume the day before the announcement. x.comÂ