Metro Bank's shares slumped on Thursday after reports it is looking to raise millions to boost its balance sheet.
But bosses at the bank insisted that its finances were strong and its share price staged a recovery on Friday.
So what's been going on?
What is Metro Bank?
Metro Bank was set up in 2010 as a "challenger" bank to bigger, more traditional, lenders.
It was launched in the wake of the financial crisis and was the first High Street bank to open in the UK in more than 100 years.
Its founder, American Vernon Hill, said at the time that he wanted to do things differently: so the bank offered customer-friendly perks like opening its doors seven days a week and even putting out water bowls and dog biscuits for customers' pets.
Metro Bank currently has 76 branches across England and Wales, and in July said it planned to open 11 more across the north of England in 2024 and 2025.
What's been going on?
The lender has faced a number of challenges in recent years after an accounting scandal in 2019, which led to some top executives, including Mr Hill, leaving the company.
Russ Mould, investment director at AJ Bell, said that since then the bank has been struggling "to get on a path to sustained profitability".
More recently, it had asked City watchdogs for permission to use its own ratings system to value its mortgages and its assets. That would have freed up cash so it could go out and continue to grow its business.
But regulators turned down the request last month, saying that they wanted the bank to use an external rating system for now.
Although it has been successful in winning 2.7 million customers, analysts said that - like other banks - it might have found it tricky to make money in the past few years when interest rates were at historic lows.
The BBC understands Treasury officials have been in touch with the Prudential Regulation Authority, the financial services regulator, which is monitoring the situation at the bank.
What happened to its share price?
Metro Bank's share price started to slide last month after the decision by the Bank of England not to allow the bank to use its own internal measures to work out the risks attached to its mortgages.
Then, after the reports this week that it was looking to raise money, its shares tumbled by as much as 30% on Thursday, hitting lows of about 34p per share.
The shares recovered some ground on Friday. However, the bank's stock market value is now less than 拢100m, whereas it was valued at about 拢3.5bn at its peak five years ago.
Analysts suggested that the reports it could be looking to raise money through selling new shares might have spooked investors.
The lower the share price is, the more shares that Metro Bank needs to sell and the bigger the hit to existing shareholders, which can "become a bit of a vicious circle", Mr Mould told the BBC's Today programme.
Analysts are also on high alert for any problems in the banking sector following the collapse of US banks Silicon Valley Bank and Signature Bank in March this year.
They marked the two biggest bank failures in the US since the financial crisis of 2008 and their collapse sparked fears about the wider strength of the sector.
Is my money safe?
Metro Bank is operating as normal and does not face any immediate threat.
Customer deposits up to 拢85,000 are protected by the Financial Services Compensation Scheme, which guarantees that if a bank runs into trouble, depositors will get their money back up to that level.
That guarantee would cover the vast bulk of Metro Bank's 拢15.5bn in customer deposits.
While it has been reported that the bank is looking at selling some of its mortgages to other banks, homeowners don't face any immediate change. Some customers might end up having their loans managed by another bank in the future.
Who owns Metro Bank?
Metro Bank is a publicly listed company on the London Stock Exchange.
This means that its shares are sold to the public who become part owners, or shareholders, in the business.
Metro Bank's biggest shareholder is Spaldy Investments, with 9% of shares. It is an investment vehicle owned by Colombian billionaire investor Jamie Gilinski Bacal, who built one of the biggest banking empires in Latin America.
