Catalyzes the transfer of phosphatidylinositol and phosphatidylcholine between membranes (PubMed:10531358, PubMed:18636990, PubMed:20332109). Also catalyzes the transfer of sphingomyelin (By similarity). Required for COPI-mediated retrograde transport from the Golgi to the endoplasmic reticulum; phosphatidylinositol and phosphatidylcholine transfer activity is essential for this function (PubMed:20332109). {ECO:0000250|UniProtKB:Q9TR36, ECO:0000269|PubMed:10531358, ECO:0000269|PubMed:18636990, ECO:0000269|PubMed:20332109}. This is the function of PITPNB (phosphatidylinositol transfer protein beta, ENSG00000180957).