Miter announced a $40 million Series B on 30 September 2026, led by Battery Ventures, with existing investors Bessemer Venture Partners and Coatue participating. The release puts the San Francisco company’s total capital raised at $78 million.
The round follows a raise the company made last year. In May 2025 Miter raised $23 million from Bessemer and Coatue, which brought its cumulative funding to $38 million at the time. Neither the release nor the trade coverage of this round gives a valuation, and a search for a reported figure did not surface one.
Miter’s own boilerplate calls the product an “AI-native operating system.” What Miter sells, though, starts somewhere less glamorous than that phrase suggests. It is payroll. Around that it has assembled HR, time tracking, field operations, job costing and expense management — the set of things a contractor’s back office does between the moment a crew clocks in and the moment the money leaves the building. The company’s own site puts its customer count at more than 2,000 companies, a figure the release repeats.
The Number in the Release Is a Distribution Claim
The most striking line in the announcement is not the $40 million. It is this, in the company’s framing: roughly two of every 100 American construction workers are paid through Miter. The release also says Miter has tripled its customer count since what it calls its Series A in May 2025, and that it coordinates workforce across hundreds of thousands of active jobs each month.
These are the company’s numbers, offered without an external audit, and they should be read that way. But it is worth being precise about what kind of claim the first one is, because it is different in character from the growth figures around it. Customer counts and job counts are measures of how much software a company has sold. A share-of-workforce figure is a claim about position in a market — and in payroll specifically, position is close to the whole asset.
Co-founder and chief executive Connor Watumull, quoted in the release: “The U.S. has never needed this much new infrastructure this fast. We need to unleash the potential of electricians, welders, carpenters and ironworkers everywhere. Miter is helping contractors modernize their operations and unify their workforce, jobsites and financials in one system.”
Watumull co-founded Miter with Tobin Paxton, and serves as its chief executive.
Why Construction Payroll Is a Moat and Not a Feature
Payroll is, in most industries, among the least differentiated software a company buys. Construction is the exception, and the reason is regulatory rather than technical.
A commercial contractor running public work has to produce certified payroll reports. It has to pay prevailing wage rates that vary by county and by trade classification, and it has to get the classification right for a worker who spent Tuesday morning as a labourer and Tuesday afternoon doing something that pays differently. If its workforce is unionised, it owes fringe benefit contributions calculated per hour, per local, under agreements that do not resemble each other. A crew that crosses a state line mid-week creates a multi-state tax event. None of this is hard in the sense of being intellectually deep. It is hard in the sense that getting it wrong is expensive, the rules are numerous, and a generic payroll product simply does not model them.
That is a compliance surface, and compliance surfaces are where vertical software earns the right to sit in a workflow nobody wants to touch twice. Miter’s own marketing leans on exactly these capabilities — prevailing wage, certified payroll, union compliance — and positions them as the reason a contractor would leave a horizontal provider.
It also explains the shape of the AI argument, which the release makes briefly: the money goes toward AI products for the back office and the jobsite, plus engineering hiring in San Francisco and New York and go-to-market expansion across the US. Michael Brown, a general partner at Battery Ventures, in the release: “The construction industry is tremendously complex, which has made it difficult for technology providers to develop robust tools attuned to customers’ specific demands, despite the large potential market. But Connor, Tobin and their team have succeeded in developing an easy-to-use, integrated product that delivers payroll as well as other mission-critical business functions.”
Read structurally rather than as investor enthusiasm, that is a statement about sequencing. Payroll is the system of record for labour cost, and labour cost is one of the largest and least legible lines in a construction job. A company that already holds the timesheet, the classification and the cost code holds the data that any useful model of labour productivity would need. Whether Miter builds that is a separate question from whether it is sitting in the right place to try.
The Back Office Keeps Drawing Cheques
This is analysis rather than reporting, and it should be labelled as such: the construction back office has been one of the more consistently funded corners of the sector this year, and the rounds have clustered around the same insight from different entry points.
Thirteen days before this round, on 17 September, Tidemark led a $30 million Series B into Adaptive, which argues that the hard part of construction accounting is not the accounting but finding out what is actually happening on the job. Trayd raised $10 million against the payroll problem as it presents itself to specialty trade contractors. Miter is now the largest of the three raises, and it is arriving at the same territory from the labour side.
The common thread is not that back-office software is newly fashionable. It is that the financial and the physical have been separated in construction for as long as both have been recorded, and every one of these companies is selling some version of a bridge between them. The disagreement is only about which end of the bridge to build from — the ledger, the jobsite, or the payslip.
Named in the release as customers: Clayco, which the release describes as an ENR Top 5 design-build firm, and Haugland Group, described as a family-owned, union-strong infrastructure services organisation with more than 1,600 employees.
The release is more specific about the AI than such releases usually are. In the back office, it says, Miter’s technology “parses and structures the data buried in invoices, receipts and pay rate tables,” runs workflows contractors previously did by hand, and surfaces labour and job-cost trends “while the job is still running rather than weeks after it closes.” In the field, it says the AI “creates safety reports from photos or voice notes and summarizes job status using inputs from across the platform.” It names safety, accounts payable and project intelligence as the areas it is building into next.
Those are described as capabilities the platform already has, and they are consistent with the argument above: every one of them is a document or a data structure that passes through payroll and job costing anyway. What the release does not attach to any of it is a ship date for the next tranche, a number for the engineering hiring it describes in San Francisco and New York, or a revenue target. For a Series B that is unremarkable. It does mean the load-bearing claims available to check today are the ones about position — and those, for now, remain the company’s own.
