Lacey, 75, was tried on a total of 86 criminal counts in the case against him and four other Backpage employees.
Chief financial officer John Brunst was convicted of one count of conspiracy to violate the Travel Act and more than 30 money laundering counts.
Executive vice president Scott Spear was convicted of one count of conspiracy to violate the Travel Act, more than a dozen counts of facilitation of prostitution and about 20 money laundering counts.
Operations manager Andrew Padilla and assistant operations manager Joye Vaught were acquitted of a conspiracy charge and dozens of counts of facilitation of prostitution.