Hargreaves Lansdown PLC on Thursday confirmed it rejected a takeover approach from a group of private equity firms including CVC Advisers.
Shares in the Bristol, England-based wealth management.
Stocks in London were treading water at midday Thursday, amid news that the UK manufacturing sector returned to growth in May.
The FTSE 100 index was up 3.15 points at 8,373.48. The FTSE 250 was up.
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London stocks were little changed by midday on Thursday as investors got their first chance to react to news of a general election on 4 July, with Hargreaves Lansdown powering ahead after rejecting a takeover offer.