Aegon Retirement Choices (ARC) was a late entrant to the platform market, but has seen rapid growth.
Aegon UK chief executive Adrian Grace said: "While I'm delighted we have hit the £1bn mark, it's the pace we have built, delivered and grown this proposition that pleases me more.
"This has gone from a concept to a market-leading platform in the space of three years."
The product was launched by the former Scottish Equitable in the second half of last year, but Mr Grace said it only became a focus of the business in 2013, and added: "Therefore we have reached this milestone figure in just ten months".
The former Halifax Bank of Scotland and Barclays executive said this made ARC the fastest growing platform in the market.
Administration platforms have become a key part of the investment market.
Other Scottish-based offerings include those from Standard Life and Nucleus Financial Group.
Aegon claims a distinct position because its ARC combines an adviser platform with a workplace savings platform.
"Our proposition is based around the needs of our customers, but the advised market is absolutely crucial to our success," Mr Grace said.
Mr Grace, who took over in 2011, has previously said Aegon "started 100 metres behind in a 400-metre race" in adjusting to industry changes.
Last month Aegon announced plans to create more than 100 new roles at its headquarters in the Scottish capital over the next few months, including at its platform operation.
The Dutch based Aegon parent business has a presence in more than 20 markets.