Angus Tulloch and others have signed an open letter declaring independence is in Scotland's economic interest, but prime minister David Cameron has cautioned on the possible impact on Scottish financial services.
More than 130 businesses have signed a letter saying the business case for Scottish independence "has not been made".
Scotland voting yes to independence from the rest of the UK would be a "disaster" Novia chief executive - and Scot - Bill Vasilieff has said, less than a month before the referendum.
The managers of the Ruffer investment company have defended their portfolio's exposure to the US dollar, saying it will protect them against a trio of political events which could knock back sterling.
Investors buying Scottish shares 60 years ago will have seen only half the returns enjoyed by those owning the rest of the UK's listed companies, according to a mocked-up 'Scotsie 100' index.
Alex Salmond has been accused of pressurising Scottish financial services representatives from releasing a report on independence.
David Cameron will call on the "silent majority" of Scottish businessmen and women to reveal their fears about independence and vote "no" in a speech later today.
Andy Murray will become the latest face of Standard Life after the group signed a three-year partnership with the Wimbledon champion.
A row has broken out over the cost of setting up all of the public bodies needed in an independent Scotland.