Mercury fintech hits $650M annualized revenue after Series C

Mercury fintech announced a new milestone: at the end of Q3 the company recorded $650 million in annualized revenue, according to an exclusive Fortune interview published on November 7, 2025.

How did Mercury’s March Series C and $3.5 billion valuation reshape its growth outlook?

In March, Mercury completed a Sequoia-led $300 million Series C that valued the startup banking platform at $3.5 billion. That round supplied both capital and a market signal, validating investor belief in the company’s path to scale.

However, a financing event is a snapshot. Management and investors will use the proceeds to deepen product features, hire for regulated operations, and expand market share among startups and scaleups.

Series C details

The March financing was presented publicly as a growth round to accelerate product development and compliance investments. Media coverage at the time documented the size and lead investor, linking the cash infusion to an elevated public valuation.

Valuation and investor context

Valuation affects expectations for returns and follow-on rounds. Consequently, analysts will test unit economics against the headline figure, focusing on revenue per customer and margin trends as the company grows.

How significant is Mercury’s annualized revenue jump from $500M to $650M?

Management told Fortune that annualized revenue rose to $650 million by the end of Q3, up from $500 million at the end of 2024.

That movement implies accelerating topline momentum through 2025 and strengthens forecasts built from monthly revenue extrapolations.

That said, Mercury uses a simple monthly-to-annualized conversion for this metric rather than a contract-style ARR measure. Analysts should therefore treat the number as a high-level activity indicator rather than a fully audited trailing figure.

Will profitability remain a central pillar as the company scales?

Immad Akhund, Mercury’s cofounder and CEO, emphasised a philosophy of financial discipline. He told Fortune, “I like being profitable,” and the company has reported being GAAP profitable on both net income and EBITDA for three consecutive years.

Indeed, profitability matters in banking products because customers entrust platforms with large sums. As Akhund noted, several customers hold more than $100 million on Mercury’s systems, so sustaining margins and operational soundness builds trust.

How much is Mercury investing in compliance and risk?

Mercury has stepped up compliance spending as it scales. The company said roughly 20% of employees now sit in risk and compliance roles, and it recently hired chief compliance officer Steve Pearlman to expand those capabilities.

That investment responds in part to industry shocks. The collapses of providers like Synapse and Evolve prompted regulatory scrutiny across fintech, and Mercury’s approach aims to shore up controls and reassure customers and regulators alike.

Who are Mercury’s customers and how fast is its user base growing?

Mercury’s client list reads like a startup roll call: customers include Supabase, ElevenLabs, Lovable, Linear, Phantom, and Tempo. The company reports about 40% growth in customer counts through 2025.

Moreover, Akhund’s personal activity as an investor underscores the firm’s deep ties to startup ecosystems. He has backed more than 350 startups since 2016 and announced a personal $26 million venture fund in May, which managers say keeps him connected to founder priorities.

What verification steps should analysts take before modelling Mercury’s future?

First, compare the announced annualized figure with quarter-end accounting disclosures when available.

Second, assess customer concentration and average balances, which drive revenue stability. Finally, monitor any regulatory filings or audited statements for confirmation.

In this context, the Fortune interview is the authoritative primary report of these metrics, but follow-up financial disclosures will provide the definitive detail required for modelling and valuation work.

• $650 million — annualized revenue at end of Q3 2025 (Fortune, November 7, 2025).
• $500 million — annualized revenue at end of 2024 (Fortune).
• $3.5 billion — valuation after a Sequoia-led Series C in March (Fortune).
• Sequoia-led $300 million Series C — March financing round (Fortune; see third-party coverage below).

Exclusive interview with Immad Akhund published by Fortune, November 7, 2025; contemporaneous coverage of the March Series C was reported by TechCrunch.