Rare trades steal focus as director buying loses momentum in HK
Sany and Tianyi among those stocks with unusual activity while more directors step up sales

Buying among directors fell for the first time in three weeks while selling rose for the second consecutive week, last week's stock exchange filings showed.
There were 18 firms with 77 purchases worth HK$789 million, against 39 companies with 156 disposals amounting to HK$579 million.
In the previous week, there were 25 firms in 127 purchases worth HK$807 million, while 31 companies saw 172 disposals valued at HK$365 million.
Buy-back activity also fell, with seven companies making 18 purchases worth HK$51.7 million, down from the previous week's eight companies and 39 trades worth HK$154 million.
Last week, there were rare trades in Sany Heavy Equipment International Holdings, China Tianyi Holdings, Man Wah Holdings and China Dredging Environment Protection Holdings.
Sany recorded the first trades by a director in the coal mining equipment maker since it was listed in November 2009.
