IronMan, During Ole days, Lehman Securitizing Loans In Separate Trust “Shelves”: SARM, SASC, SAIL, LXS and LMT... Lehman used the “Lehman XS Trust” (“LXS”) shelf for the securitization of Alt-A, Alt-B and negative amortization loans. Very ineresting read: http://www.lehmanmbssettlement.com/Portals/0/Documents/LBMBS%20-%20Amended%20Complaint.pdf