The supply of collectable bottles of single malt Scotch to auctions in the UK reached an all-time high of 43,458 in 2015, up 27.83% on 2014, according to consultancy Rare Whisky 101.
And despite the increase in supply, all key rare whisky investment indices beat many established asset classes like stocks, oil and gold, the consultancy said.
The most comprehensive index for Scotch whisky, the Rare Whisky Apex 1000 Index, ended the year up 14.36%.
The total value of bottles sold at auction in the UK also hit record levels at £9.56 million, beating the 2014 total of £7.64 million by 25.13%.
The consultancy said 4,888 bottles of single malt Scotch sold on the open market in December 2015 alone, 19.13% ahead of the previous highest 4,103 in December 2014.
The whole of 2009 saw just 4,072 bottles sold through the entire year.
In 2015, Macallan accounted for 9.59% of bottles sold and for 22.71% of the total value.
The next closest distillery in volume and value was Ardbeg, with an 8.27% share of volume and a 7.68% share of value.
Bowmore was third with a 4.24% share of volume and a 6.44% market share of value.
Read the entire Rare Whisky 101 annual report below: