The Liberal Democrats received £120,000 in donations in one week, according to new figures from the Electoral Commission.
The money was donated between April 13 and 19 – the previous week the Lib Dems raised £20,000.
Political parties that receive donations or enter into new borrowing of over £7,500 to the central party during the election period must report it to the Electoral Commission on a weekly basis.
The Lib Dems have confirmed that former BBC director general Greg Dyke gave them £15,000.
They also received £95,000 from Alpha Healthcare.
The latest figures show the Tories received 47 donations between April 13 and 19, totalling £2.2m.
Warburtons, the bakers visited by Conservative leader David Cameron earlier in the election campaign, gave £25,000.
The Tories had six cash donations of more than £100,000.
Labour raised £1.49m in the same period, while the SNP received one donation of £10,000.
The Union of Shop Distributive and Allied Workers (Usdaw) made the largest donation, £500,000, to Labour.
The Buckinghamshire Campaign for Democracy, a group challenging Commons Speaker John Bercow in his Buckingham constituency, received two donations totalling £20,000.
The Electoral Commission reports that since the start of the election campaign on April 6, the Conservatives have raised £3.67m, Labour £2.27m and the Lib Dems £140,000.
Under the Political Parties, Elections & Referendums Act 2000 (PPERA), parties have 30 days after receiving a donation to check that it is from a permissible source and decide whether to accept it.
In their weekly reports, political parties must report donations that they are given during the relevant period. This does not necessarily mean that the parties have formally accepted the donations.


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