About
Alt-X is building an AI-native liquidity layer for private markets, initially focused on venture-backed secondaries and accredited-investor access to private-company opportunities. It also offers an Excel-native AI underwriting agent for PE, VC, and real-estate investors, differentiating through automated diligence, valuation, investor matching, transaction execution, and auditable financial modeling.
Market
Alt-X operates at the intersection of AI-native commercial-real-estate underwriting software and private-markets fintech infrastructure. Its initial wedge is an Excel-native agent that converts long offering memorandums into auditable underwriting models, differentiating through page- and line-level citations and approval controls rather than black-box outputs. At the broader platform level, it aims to automate private-asset diligence, valuation, investor matching, and transaction execution, while its closest current underwriting competitors include AI-native tools such as Primer, Kolena, Cactus, and Blooma and established platforms such as Dealpath and Argus Enterprise.
Alt-X primarily targets professional real-estate investment firms, acquisitions teams, underwriters, and asset managers that still rely on Excel and manual analysis. Its broader private-markets platform also targets founders, employees, and early investors seeking liquidity, alongside accredited investors seeking exposure to private companies.
At a Glance
Problem
Real-estate underwriting still depends heavily on manual spreadsheet work. Analysts must read offering memoranda or investment decks, extract assumptions, build cash flows, connect formulas, and assemble models for each prospective deal. That workflow consumes expensive analyst time, creates delay, and makes it harder for investment teams to evaluate more opportunities. Alt-X’s central use case is turning an offering memorandum into a fully built, auditable Excel model in seconds.
The primary customers are real-estate investors, underwriters, acquisitions analysts, and deal teams. The pain is especially acute in transaction screening and acquisition underwriting, where repeated modeling work and late-night spreadsheet sessions can slow decisions and limit deal throughput.
Product / Service
Alt-X is an AI-powered Excel add-in built specifically for real-estate underwriting. A user uploads an offering memorandum or investment deck; Alt-X extracts the assumptions, builds the cash flows, and links the formulas automatically inside Excel. It supports real-estate waterfall models, LBO analyses, and DCF valuations, with the stated benefit of eliminating manual setup while keeping the resulting model auditable.
The product is delivered as a downloadable Excel plugin and is already live. Its pricing page describes a seven-day free trial, a $30-per-month Pro plan for individual analysts, a $60-per-month Enterprise plan for collaborative deal teams, and a $300-per-month Ultra plan for custom deployments, with features such as dependency mapping, team management, SSO, and support tiers.
Market
Alt-X competes in AI-assisted financial modeling and real-estate underwriting software, with the existing manual Excel-and-spreadsheet workflow as the principal incumbent. The company positions itself as the first AI Excel agent specifically for real-estate underwriting. No named direct competitors are identified in the available research, although the broader category includes tools and workflows that automate financial-model construction and deal analysis.
The company appears to be at an early commercial stage rather than an established scaled vendor. Its product is live, it is backed by Y Combinator, and its YC profile lists it as founded in 2025, part of the Winter 2026 batch, active, and operating with a two-person team. Alt-X is actively recruiting real-estate firms and asking investors, underwriters, and acquisitions analysts to try the product on real deals. Revenue is not disclosed, so the available evidence supports describing it as early-stage with initial monetization plans, not definitively as pre-revenue.
Founders & Leadership
Funding History
Y Combinator
Recent News
A June 2, 2026 profile describes Alt-X as an AI underwriting agent that lives in Excel, parsing offering memorandums and building auditable real-estate underwriting models. It also reports that the company is a Y Combinator Winter 2026 company and is piloting with family offices and private funds.
Y Combinator highlighted Alt-X's product, which turns a 200-page offering memorandum into a fully built, auditable institutional underwriting model in Excel within seconds. The company said its product was live and sought real-estate investors, underwriters, and acquisitions analysts to test it on real deals.
In a company LinkedIn update, Alt-X described an AI associate that turns PE, growth, M&A, and real-estate datarooms into cited, IC-ready answers. The company claimed the system was already being used to manage more than $1 billion in total assets.
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Get notified when they postBusiness Model
Alt-X monetizes its Excel add-in through tiered SaaS subscriptions: a free seven-day trial, Pro at $30 per month, Enterprise at $60 per month, and Ultra at $300 per month with custom deployments and dedicated support. The available materials do not specify transaction fees or other revenue streams for its private-market platform.