Several AI-focused companies have recently announced that their revenues are not only growing, but reaching annualized revenue milestones at an accelerating pace. It is important to note these firms use different definitions of “ARR”: some refer to annualized recurring revenue, others to revenue under contract that has not yet been billed, some project an annualized run rate based on the most recent month, and others report “committed ARR” tied to signed but not-yet-onboarded contracts.
Below are companies that have publicly reported faster and faster revenue milestones, listed in reverse chronological order of when they announced their ARR growth. The measurements are not uniform, but each company describes accelerating top-line momentum.
Mercor
On Monday Brendan Foody, co-founder and CEO of Mercor, announced the company crossed $2 billion in gross annualized revenue as of June — just four months after reaching the $1 billion milestone. The firm, less than three years old, hires domain experts to train and refine AI models and previously reported a $500 million run rate in September.
Anthropic
Anthropic has reported historic velocity in its revenue run rate. In late May the company said it crossed a $47 billion revenue run rate, coming less than two months after it reported the same metric had exceeded $30 billion. The company said it reached a $9 billion run rate in late 2025, up from a reported $4 billion in July 2025.
Sierra
Sierra, which builds customer service AI agents for enterprises, reached its first $100 million in ARR in seven quarters. Bret Taylor, co-founder and CEO, announced in late May that it took only two more quarters to add another $100 million to that ARR.
Glean
In May Glean announced it crossed $300 million in ARR. The enterprise AI startup said it took nine months to double its ARR from $100 million to $200 million, and only six months to grow from $200 million to $300 million.
Gusto
The 14-year-old HR tech company Gusto said in May that its revenue accelerated in each of the last five quarters and reported surpassing $1 billion in trailing 12-month revenue. Gusto was last valued at $9.3 billion in early 2022.
Clio
Clio, an 18-year-old provider of legal practice management software, embedded AI into its offering in 2023 and has since seen sharp revenue growth. The company surpassed $200 million in ARR in mid-2024, doubled that figure by late last year, and recently announced its ARR reached $500 million.
Why it matters
These examples show that both AI-native startups and more established technology vendors can see top-line growth accelerate when AI capabilities are integrated or when demand for AI-driven products rises. However, because companies use different ARR calculations, comparisons should be made cautiously and ideally only on comparable metrics.
(This article is based on public statements from the companies cited; there are additional fast-growing AI firms beyond those listed here.)
