Reg,
This link gives the dates: http://www.reuters.com/article/press... .
Please note the cutoff for share ownership was 7/21 and the reverse split shares started trading 7/24. On 7/22 the London silver fix was $18.60 and on 8/15 it was $12.82 for a 31.07% drop. The logic for the reverse split defies me since the silver price had gone up since the Silver ETF started. It therefore looks like the motive was sinister however I don't know why this split had the effect it appears to have had.