Hargreaves Lansdown platform clients have experienced problems using the service on Wednesday afternoon (29 May).
The FTSE 100 listed firm issued a statement on its social media accounts stating: "We're aware some people are experiencing intermittent service issues. We're investigating and expect them to be resolved shortly. Thank you for your patience."
Some clients were unable to log into the platform for a period of time this afternoon.
The outage lasted about an hour and a company representative apologised for the inconvenience.
A spokesman for the company said: "A few people had issues logging into their accounts for a short time. Everything is working normally now."
Hargreaves Lansdown's most recent set of results showed the platform attracted net inflows of £2.9bn in the first four months of 2019, about £400m less than in the same period in 2018.
But the FTSE 100 company's trading statement revealed positive market movements of £9bn helped its assets under management reach £97.8bn at the end of April 2019, the highest it has ever been in the history of the firm.
The firm had 1.18m clients at the end of April 2019, and revenue rose to £159m, as margins were higher.
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