TUI Travel advanced following reports its majority owner TUI AG is pressing ahead with plans to merge the two companies.
Germany-based TUI AG, which owns 55% of TUI Travel, said there was "no plan B" in the event of a failure of the proposed merger with the listed UK business.
TUI AG also reported third quarter underlying earnings rose 89% to €163m on a 3% lift in turnover to €11.4bn, resulting in a 28% narrowing in nine-month underlying pre-tax losses before interest and amortisation to €182m.
The company said it expected annual earnings to be "at least at the upper end of guidance" of 6%-12% higher than last year's €762m following strong results at its cruise and hotel divisions and at TUI Travel, which contributes more than 80% of its profits.
Petrofac was another high riser a day after announcing it won a contract to build a refinery for Malaysia's state-owned Petronas worth $500m.
In contrast, G4S, Admiral Group and Rio Tinto were among the biggest fallers.
FTSE 100 - Risers
TUI Travel (TT.) 373.60p +3.23%
Petrofac Ltd. (PFC) 1,134.00p +2.25%
British Land Co (BLND) 722.00p +2.12%
HSBC Holdings (HSBA) 649.60p +1.77%
Land Securities Group (LAND) 1,084.00p +1.69%
Royal Mail (RMG) 443.30p +1.67%
Intu Properties (INTU) 335.20p +1.42%
Johnson Matthey (JMAT) 3,055.00p +1.36%
SSE (SSE) 1,483.00p +1.16%
SABMiller (SAB) 3,261.00p +1.16%
FTSE 100 - Fallers
G4S (GFS) 268.30p -1.90%
Admiral Group (ADM) 1,350.00p -1.53%
Rio Tinto (RIO) 3,373.00p -1.48%
Burberry Group (BRBY) 1,441.00p -1.10%
Kingfisher (KGF) 298.10p -1.06%
Intertek Group (ITRK) 2,795.00p -0.96%
Friends Life Group Limited (FLG) 309.10p -0.96%
BHP Billiton (BLT) 2,023.50p -0.78%
Next (NXT) 6,820.00p -0.66%
AstraZeneca (AZN) 4,075.00p -0.65%