One of his close business allies was Thai logging tycoon Choon Tangkakarn, owner of Pathumthani Sawmills. Reports suggest that he and his Thai associate operated in the area controlled by former drug-lord Khun Sa. U Kyaw Win serves as chairman of Myanmar May Flower Bank which is the third biggest in Burma. It was the first bank to have 24-hour automatic teller machines as of November 1995 and also was the first to introduce computer networks for transactions. The bank has ten branches in Burma.
Reports suggest that the bank has plans for a large-scale telephone project.
In 1998, U Aik Hok and U Win Naing bought a large number of shares in May Flower Bank from U Kyaw Win. Since then the bank's activities have slowed. In fact, after the transaction of the bank's shares, the bank was financially sound. Surprisingly, instead of being more aggressive, the bank maintains a passive stance, prompting the comment by clients that the activities of the bank is not extraordinary. According to reports, Kyaw Win was seen in Tachilek shortly after the ADB meeting concluded, suggesting that Kyaw Win came to attend the meeting.