(Sharecast News) - London's FTSE 250 was up 0.6% at 20,357.12 in afternoon trade on Tuesday.

Keller surged as it said its full-year performance was set to be "materially ahead" of current market expectations after a strong first half.

In the half year to 30 June, statutory pre-tax profit rose 121% to £95.3m, with revenue up 2% on the same period a year earlier at £1.49bn.

Keller - which lifted its dividend per share by 19% to 16.6p - said revenue was largely driven by growth in North America Foundations and Central Europe, partly offset by lower revenues at Suncoast and the NEOM project in Saudi Arabia compared with the prior period.

The geotechnical engineering firm hailed a record order book of £1.6bn, and said that this, along with the strength of its performance, have given it confidence to increase its outlook for the year.

"As a consequence, the board now anticipates that the group's performance for the full year will be materially ahead of current market expectations," it said.

Market expectations are for FY24 underlying operating profit of between £176m to £179m.

Flexible workspace provider IWG racked up strong gains as it reported record first-half revenue.

Domino's Pizza was in the red as it warned that full-year profit would be towards the lower end of the current range of market expectations after a slower start to the first half.

Current market expectations are for FY24 underlying EBITDA of between £144.3m and £149.2m, with a mean of £147.1m.

FTSE 250 - Risers

Keller Group (KLR) 1,510.00p 9.58%

International Workplace Group (IWG) 169.90p 6.45%

Wood Group (John) (WG.) 133.20p 4.06%

North Atlantic Smaller Companies Inv Trust (NAS) 4,000.00p 3.90%

Bytes Technology Group (BYIT) 476.00p 3.52%

Senior (SNR) 152.00p 3.12%

HGCapital Trust (HGT) 493.00p 2.60%

Patria Private Equity Trust (PPET) 528.00p 2.52%

Caledonia Investments (CLDN) 3,490.00p 2.50%

Herald Investment Trust (HRI) 2,075.00p 2.47%

FTSE 250 - Fallers

Domino's Pizza Group (DOM) 289.00p -6.47%

Trustpilot Group (TRST) 189.00p -3.87%

Bank of Georgia Group (BGEO) 3,930.00p -3.32%

Hilton Food Group (HFG) 869.00p -2.80%

Elementis (ELM) 147.20p -2.77%

Rathbones Group (RAT) 1,788.00p -2.51%

TBC Bank Group (TBCG) 2,725.00p -2.50%

Bakkavor Group (BAKK) 145.00p -2.36%

Genuit Group (GEN) 466.50p -2.30%

IntegraFin Holding (IHP) 347.00p -2.25%