Multiplier, a New York company that builds AI agent infrastructure for asset managers, raised a $6m seed round led by Lux Capital, announced on 26 August 2026. Y Combinator, GoAhead Ventures, Rebel Fund, General Advance, Unpopular Ventures and Amino Capital also invested, along with customers including Mercator Partners.
The company says the round will let it become the new operating system for investors. It gave no further breakdown of how the money will be spent, and no valuation was disclosed.
FinTech Global published its report on 27 August 2026. Neither report gave the company's revenue, number of customers or valuation.
The announcement was a Business Wire release datelined New York on 26 August 2026.
“Without evals, your AI drifts whenever you try to do any kind of continual learning”Ian McInnis, Co-founder and CEO, Multiplier
What Multiplier does
Multiplier builds what it calls agent harnesses for asset managers. It deploys a common base layer inside each customer's own systems, then adds firm-specific customisation and bespoke evaluations, or evals, for each client. Users work in the product for many hours a day across tasks from idea generation to post-trade review.
The company was previously called WithAI and was renamed to reflect the aim of multiplying investors rather than replacing them. FinTech Global said Multiplier positions itself between generic off-the-shelf finance software and costly tools built in-house.
Chief executive Ian McInnis said: "Without evals, your AI drifts whenever you try to do any kind of continual learning."
The founders
McInnis was an investor at Bridgewater Associates until February. Ryan Winkler, the chief operating officer, left StepStone Group in April. Ben Finch, chief technology officer and president, was previously a founding researcher at Sentient Labs. The founders met at Princeton University, where they ran a student-managed hedge fund that the announcement says has beaten the S&P 500 every year.
The company's founding year and headcount were not disclosed.
Who invested
Individual backers named in the announcement are Greg Jensen and Karen Karniol-Tambour, co-chief investment officers of Bridgewater Associates, Pete Briger, chairman of Fortress Investment Group, Jasjeet Sekhon, chief strategy officer at Google DeepMind, Sandeep Nailwal, chief executive of Polygon, and Kaz Nejatian, chief executive of OpenDoor.
Sekhon said he had spent enough time arguing about AI with McInnis to know he had to invest. Phil Brady of GoAhead Ventures said Multiplier provides the missing connective tissue.
Customers
Mercator Partners, a long/short investment manager that helped incubate Multiplier, is both a customer and an investor. Scott Hobart, its chief investment officer, said the firm used to spend 80% of its time gathering information and 20% acting on it. Martin Fransson, its head of primary research, described a tremendous internal proprietary knowledge flywheel.
Michael Siliciano, co-founder of the California hedge fund Verso Partners, said his firm tried nearly every tool on the market and ended up with an unwieldy collection of fragmented point solutions.
Company website: multiplier.ai