Edelman filed an amended lawsuit against Mariner claiming the firm has continued its unlawful approach of "luring away" planners.
Mariner asked an Edelman planner for his non-solicitation agreement and advised him on how to defend against a breach lawsuit, according to the complaint.
The poaching by Mariner has caused the departure of at least 851 Edelman clients representing over $621 million in AUM, the suit contends.