Bioamber WAS split-adjusted. When they went public, they IPO'd Units consisting of stock and warrants. The Units were listed on the NYSE. Later, they split the units up into separate listings for the common and the warrants. Thus, the prices were split adjusted between the Unit Trading Price and the common and warrant trading prices.
From the 2016 10-K:
Our securities have been traded on the New York Stock Exchange, or NYSE, since June 10, 2013, when the units issued in our initial public offering on May 9, 2013 (trading under the symbol “BIOA.U”) were split into our common stock, trading under the symbol “BIOA” and our warrants, trading under the symbol “BIOA.WS”. In connection with the initiation of the separate trading of our common and warrants, the trading of the units were suspended and delisted from NYSE.
