"Independent whisky bottlers are bottlers who bottle whiskies from casks that distilleries did not officially release or sell to the market for various reasons, such as a cask that was considered very rare or experimental and thus set aside, or a barrel that did not match the taste profile required by the distillery for its signature whiskies or official bottlings."
"These Independent whisky bottlers are experimental people. They experiment with longer maturation periods. They experiment with different casks and finishes. They bottle at cask strength, avoid chill-filtration and artificial colouring, and – in the main – only release single malts."
Full IB list