In 1935, after being barred from the securities business for over a year, the heads of J.P. Morgan spun off its investment-banking operations. Led by J.P. Morgan partners, Henry S. Morgan (son of Jack Morgan and grandson of J. Pierpont Morgan) and Harold Stanley, Morgan Stanley was founded on September 16, 1935, with $6.6 million of nonvoting preferred stock from J.P. Morgan partners. In order to bolster its position, in 1959, J.P. Morgan merged with the Guaranty Trust Company of New York to form the Morgan Guaranty Trust Company. The bank would continue to operate as Morgan Guaranty Trust until the 1980s, before migrating back to the use of the J.P. Morgan brand. In 1984, the group purchased the Purdue National Corporation of Lafayette Indiana. In 1988, the company once again began operating exclusively as J.P. Morgan & Co.