Synthetic fuel stocks are publicly traded companies creating transportation fuel from non-liquid feedstocks such as natural gas, coal, and municipal waste. Drop-in biofuel stocks are publicly traded companies creating transportation fuel from organic feedstock that can be used, transported, and stored by conventional petrofuel infrastructure. A synthetic fuel is a biofuel if it is made from organic feedstock. It is a drop-in fuel if it is compatible with the existing infrastructure for petroleum based fuels.

Amyris (AMRS)
BioAmber (BIOA)
Codexis (CDXS)
Darling Ingredients (DAR)
Gevo (GEVO)
Global Bioenergies (ALGBE.NX)
Neste, Inc. (NEF.F, NESTE.HE, NTOIF, NTOIY)
N-Viro International Corp. (NVIC)
Renewable Energy Group (REGI)
Sasol Ltd. (SSL)
Velocys, PLC (VLS.L)
If you know of any synthetic fuel or drop-in biofuel stock that is not listed here, but which should be, please let us know in the comments. Also for stocks in the list that you think should be removed.