Hydrolyzes bioactive fatty-acid esters of hydroxy-fatty acids (FAHFAs), but not other major classes of lipids (By similarity). Shows a preference for FAHFAs with branching distal from the carboxylate head group of the lipids (By similarity). Regulates the expression and the cell-associated anticoagulant activity of the inhibitor TFPI in endothelial cells (in vitro) (By similarity). 9-hexadecanoyloxy-octadecanoate + H2O = 9-hydroxy-octadecanoate + H(+) + hexadecanoate 12-hexadecanoyloxy-octadecanoate + H2O = 12-hydroxyoctadecanoate + H(+) + hexadecanoate 9-(9Z-hexadecenoyloxy)-octadecanoate + H2O = (9Z)-hexadecenoate + 9-hydroxy-octadecanoate + H(+) 12-(9Z-hexadecenoyloxy)-octadecanoate + H2O = (9Z)-hexadecenoate + 12-hydroxyoctadecanoate + H(+) 13-(9Z-hexadecenoyloxy)-octadecanoate + H2O = (9Z)-hexadecenoate + 13-hydroxy-octadecanoate + H(+) 9-octadecanoyloxy-octadecanoate + H2O = 9-hydroxy-octadecanoate + H(+) + octadecanoate 12-octadecanoyloxy-octadecanoate + H2O = 12-hydroxyoctadecanoate + H(+) + octadecanoate 13-octadecanoyloxy-octadecanoate + H2O = 13-hydroxy-octadecanoate + H(+) + octadecanoate 9-(9Z-octadecenoyloxy)-octadecanoate + H2O = (9Z)-octadecenoate + 9-hydroxy-octadecanoate + H(+) 12-(9Z-octadecenoyloxy)-octadecanoate + H2O = (9Z)-octadecenoate + 12-hydroxyoctadecanoate + H(+) 13-(9Z-octadecenoyloxy)-octadecanoate + H2O = (9Z)-octadecenoate + 13-hydroxy-octadecanoate + H(+) 5-(9Z-octadecenoyloxy)-octadecanoate + H2O = (9Z)-octadecenoate + 5-hydroxy-octadecanoate + H(+) Colocalized with TFPI and CAV1 in lipid rafts. Belongs to the AIG1 family.