Prime Minister Theresa May had no way to win an outright majority in parliament.
The shock outcome saw the pound shed 2 percent on fears the political turmoil could delay and confound talks on leaving the European Union, which are due to start in less than two weeks.
Yields on 10-year gilts fell 3 basis points to 1.00 percent, but FTSE futures recouped early losses and turned 0.2 percent higher, perhaps on hopes that a weaker pound would help the economy.
The damage was limited elsewhere, with E-mini futures for the S&P 500 edging up 0.1 percent.
Japan's Nikkei added 0.5 percent and MSCI's broadest index of Asia-Pacific shares outside Japan were all but flat.
"This is messy for the UK economy and its Brexit negotiations and hence is a negative for the pound and share market," said Shane Oliver, chief economist at AMP.
"But the UK is just 2.5 percent of world GDP and it's hard to see significant implications for global investment markets."
The pound skidded to $1.2697, at one stage having carved out a two-month trough of $1.2689. It was also down 1.8 percent on the euro at 88.18 pence.
The rot started when an exit poll showed the ruling Conservatives could fail to win a clear majority when markets had expected a handy victory.
"At this stage, there is no obvious way a formal, stable coalition government can be constructed, and therefore there is a high likelihood of a potentially prolonged period of uncertainty over who will be prime minister," said John Wraith, a strategist at UBS.
Yet he cautioned bears against chasing the pound much lower from here.
"Today's result will in part be seen as a vote against a definitive break from the EU, and the market may soon begin to reassess the probability of a so-called 'hard Brexit'."
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