Investment firm GK Goh says its takeover offer for corporate and advisory services firm, Boardroom, has turned unconditional.

The offer became unconditional after it was in control of more than 50 per cent of Boardroom's shares.

GK Goh made a mandatory general offer to buy all of Boardroom's stocks at 57.5 cents a share through its unit Salacca in January.

It was required to make a takeover offer after its stake in Boardroom was raised from 33.68 per cent to 44.03 per cent.

Its interest in Boardroom rose following Salacca's purchase of a 10.35 per cent stake from another party, Third Avenue Management.

GK Goh shares closed a cent down at 82 cents on Tuesday. It gave the update on the takeover after markets closed.