The figures also revealed that bottles sold in the UK rose more than 25% to £5.771m in the first six months of the year, in comparison with the previous year.
The volume of collectable bottles experienced an ever bigger rise of 28.5 per cent to 26,527 bottles.
Research was carried out by whisky analyst, broker and investment expert Rare Whisky 101, which has also predicted that the UK auction market for rare Scotch will reach 55,000 bottles for the full year, then times the volume sold in 2010, and will exceed a total value of £12m.
Whisky investment analyst and co-founder of Rare Whisky 101, Andy Simpson said: "For some in the broader Scotch category, export and sales figures still appear challenging.
"However, the secondary market for rarities shows little of this stress and 2016 is shaping up to be yet another record year for rare whisky."
The top 100 performing bottles of Investment Grade Scotch (Rare Whisky 101 Apex 100 Index) increased by 19.87% in the half year and have delivered a 24.05% increase over the last 12 months.
Leading rare whisky brands, Brora and The Dalmore, retain their positions as the top two ranked investor distilleries, while Macallan and Ardbeg are none movers in the collectors’ rankings.
Other key names in the industry include Balvenie, Lagavulin and Pittyvaich.
"The lack of truly collectable new product releases in recent years continues to fuel demand for older and discontinued releases where quality and rarity are powerful motivations for purchase," added Simpson.
"However, the market continues to be heavily polarised with value for collectables and limited editions from less sought-after brands softening as buyers stick to the best known, iconic brands.
"As the secondary market continues to grow and mature, so the profile of the buyer has changed.
"We’re beginning to see the arrival of more high net worth buyers - be they connoisseurs, collectors or investors - and we are now seeing an emerging group of professionals entering the market.
While many believe this will drive up prices, in our experience, few of these larger buyers seek to acquire at auction."