Retrieving the Most Recent Payment Made by Client

This is exactly what I was looking for. I have two sheets: an investment summary and a trade detail. On the summary for each ticker I wanted to show the latest trade date. Using this formula worked perfect.

Thank you!

Problem:

Columns A & B list all the pay dates of various clients.
We want to retrieve the date of the most recent payment made by each of the clients listed in column D.

Solution:

Use the MAX and IF functions as shown in the following Array formula:
{=MAX(IF($A$2:$A$8=D2,$B$2:$B$8))}