trading pattern

A lot of trades for 1 share. While this can happen now and then to round off a parcel, can anyone throw any light on other valid reasons please ? At time of writing there have been 39 trades and 10 of these have a volume of 1, and all others are for at least 200 shares.

Other reason for this post is that it has been steadily heading up for a while and now the special dividend of 40c on this one makes it an interesting buy at $5. But do your own research. Will be interesting to see what it does after going ex on the special div.