http://www.thewhiskyguide.com/Taste-Notes/Benromach-traditional.html
BOWMORE Legend: The cheapest in their line; says nothing on the label. But it happens to be aged in 70% bourbon casks, 30% sherry casks:
http://www.bruichladdich.com/by_andrew_jefford.htm
(Other online sources give the same split. The author in the link above wrote a book on Islay whiskies of which Bowmore is one. Sources claim the percentage of sherry casks in the vatting goes up as you go up the Bowmore line.)
For example, check out the 15, where the exact percentage split is given, even though the label say nothing:
http://www.bruichladdich.com/wwwproduct/pdfsheets/15/15sell.pdf
GLENFARCLAS: Despite their expressions being among the most heavily sherried in the industry (as a little research will show), many of them say nothing at all on the label. You can read the tasting notes on their website,
http://www.glenfarclas.co.uk/en/
where they all talk about sherry. Glenfarclas 12 won a Best Sherried Whisky of the Year award,
http://www.glenfarclas.co.uk/en/pages/70,12_Years_Old.html
yet says nothing on the label.
http://www.glenfiddich.us/the-range/12-year-old.html
GLENGOYNE: Known to be heavily sherried. At least the 10 and I believe the 12 say nothing on the label. Its web site says,
http://www.glengoyne.com/single_malt_whisky/malt_whisky_method/
HIGHLAND PARK: Despite HP being very heavily sherried, e.g.,
http://inebrio.com/thescotchblog/?p=69
JAMESON (no age statement) Irish Whiskey: combo of bourbon and sherry casks, exact sherry cask percentage a closely guarded secret.
http://www.jamesonlive.co.uk/history.html
http://www.theage.com.au/news/epicure/mixing-it-with-the-best/2008/05/01/1209235057195.html
JOHNNIE WALKER Black Label: says nothing on the label, but Andrew Jefford, well known wine and whisky critic mentioned above, had this to say in the Financial Times:
http://www.andrewjefford.com/node/202
Black Label
This complex, 12-year-old blend of 40 or so grains and malts (including Speyside greats Cardhu and Cragganmore) is regarded as a benchmark for the entire Scotch world. Sherry casks are an important element of the blend, according to Jim Beveridge [fitting name, that; according to the article he is Master Blender at JW]. “A classic Walker blend is a balance of the smoky West Coast style with lighter Speyside. That can leave a gap in the middle, and for Black Label we try to fill it with Highland malts matured in sherry casks.”
I could go on with this list, but time is short and my fingers are tired.