Simmons First National Corp., a Pine Bluff, Ark.-based affiliate of LPL Financial, has moved the Landmark Bank investment program it acquired last year over to the LPL Institution Services platform with approximately $400 million in brokerage and advisory assets, according to a news release.

The Landmark Bank investment program was formerly affiliated with Raymond James Financial Services.

Now called Simmons Investment Services, the investment program serves more than 8,000 clients and manages approximately $1.5 billion in brokerage and advisory assets.

LPL Financial, with headquarters in Ft. Mill, S.C.; San Diego; and Boston, is the nation’s largest independent broker-dealer.