Lumber is an AI-powered construction workforce management platform for payroll, time tracking, safety, compliance, and field productivity.[1][5] It serves construction companies using contractors and subcontractors and has raised venture funding to expand its agentic AI features.[1][2]
Access to pre-IPO shares is available to accredited investors through UpMarket.
Lumber shares are not on public exchanges. UpMarket provides accredited investors access through secondary market transactions.
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Lumber announced a $15.5M Series A led by Foundation Capital, with Tishman Speyer, Carbide Ventures, 8VC, Sure Ventures and FirsthandVC participating. The company says its AI platform automates construction workforce management tasks and targets labor shortages in the sector.
Lumber describes itself as an AI-powered construction workforce management platform, positioning the product around automating tasks that are often handled manually. Its stated use case is to help contractors and project teams address labor shortages while managing crews more efficiently.
Lumber is aimed at the construction sector, where labor shortages remain a structural problem and companies need better crew coordination tools. The company’s fundraising and product positioning suggest it is targeting a large, fragmented market with recurring workforce operations needs.
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No. As of March 2026, Lumber is a private company and does not trade on any public stock exchange. Accredited investors can access Lumber shares through UpMarket, a FINRA-registered broker-dealer that specializes in pre-IPO investments.
Lumber does not have a public stock price because it is privately held. The most recent known share price comes from its last funding round. Pre-IPO share prices on the secondary market may differ from the last round price depending on supply, demand, and market conditions.
Yes. Accredited investors can indicate interest in Lumber shares through UpMarket by filling out the form on this page or creating an account at upmarket.co. All pre-IPO offerings are subject to availability and require a $50,000 minimum investment. UpMarket is a FINRA-registered broker-dealer and has brokered more than $500M in alternative investments since 2019.
Pre-IPO investments carry significant risks. Lumber shares are illiquid, meaning there is no public market to sell them quickly. There is no guaranteed exit timeline or return. The investment is speculative in nature, and investors should be prepared for the possibility of total loss. Valuations of private companies can fluctuate substantially between funding rounds. Investors should consult their financial advisor and review all offering documents before investing.
In a pre-IPO transaction, accredited investors purchase shares from existing shareholders (such as employees, early investors, or other holders) through secondary market platforms. The company itself does not issue new shares in these transactions. UpMarket facilitates these trades as a FINRA-registered broker-dealer, handling compliance, documentation, and settlement on behalf of both parties.
There are two primary exit paths for pre-IPO holdings: selling your shares on the secondary market to another buyer, or holding until the company completes an IPO or is acquired. Both paths are subject to transfer restrictions, company approval (right of first refusal), and market conditions. The timing of any exit is unpredictable, and investors should plan for a multi-year holding period.
The minimum investment for most pre-IPO offerings on UpMarket is $50,000. This amount may vary depending on the specific offering and share availability. There are no fees to create an UpMarket account or browse available investments. Investors only pay transaction-related fees when they complete an investment.
UpMarket's valuation estimate of is derived from a proprietary model that incorporates multiple data sources: funding round data (Caplight), revenue estimates (Sacra), secondary market pricing, and public company comparables. The model applies a private company discount to the public comp multiple to account for illiquidity and information asymmetry. This estimate is not investment advice and may differ substantially from the price at which shares actually trade.
Lumber’s AI-powered construction workforce management platform handles payroll, time tracking, safety, compliance, and field productivity for construction companies, and it raised a $15.5M Series A to scale AI workforce operations — accredited investors can access Lumber stock through UpMarket.