When a securities class action settlement is approved, the work of the defense lawyer and the client who just wrote a check is largely done.

But the work is just beginning for those making claims, especially in cases involving multiple claims or sophisticated investment vehicles. That’s pretty evident from a new report from fintech company Broadridge, which helps institutional investors like hedge funds, pension funds, asset managers, and broker-dealers track litigation and navigate the claims process. Broadridge, which tracked more than 175 class action “asset recovery opportunities” for clients last year in cases yielding more than $4 billion in recoverable assets, ranked the 10 most complex opportunities in its report released Wednesday.