MarketOnce
Trusted intelligence for the decisions that matter most.
The Discipline
Proprietary data. Advanced analytics. Human judgment. Delivered with the speed of software and the discretion of a financial services firm.
The Mandate
We help private equity firms, investment banks, and consulting partners underwrite, grow, and exit portfolio companies — from commercial due diligence through hold-period value creation to sell-side readiness — with evidence that holds up in the investment committee.
Full service partner, built for speed & discretion in the age of AI
MarketOnce is the holding company of the McGrath family's twenty-five-year investment in market intelligence — a single, integrated advisory built to serve private equity, banking & consulting deal teams end to end.
We were built by operators, not by aggregators. Our analysts spent decades inside the funds, banks, and portfolio companies we now serve. We know what a decision actually costs — and we know which questions, asked at which moment, change its outcome.
What we sell is not data. What we sell is judgment, evidenced — and the rare combination of rigor at the bottom of the stack and discretion at the top.
One firm. Every stage of the deal.
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What every engagement is built on.
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For two decades, we have refused to confuse volume with value. A thousand interviews mean nothing if the wrong thousand people were asked the wrong question at the wrong time.
What clients buy from us is the conviction that the room they walked into is the right room — and that the answer we hand them is one they can stake a career on.
That is what trusted intelligence means. That is the only kind we sell.
We work with the world's leading investors & advisors.
A decision is waiting. Begin here.
Every stage of the deal.
One standard of evidence.
MarketOnce organizes a single, integrated practice around the way private equity, banking, and consulting deal teams actually work — underwriting, growing, and exiting portfolio companies without switching vendors along the way.
Three stages. One foundation.
Due diligence, value creation, and exit readiness are usually bought from three different vendors — each with its own standards, its own data, and its own blind spots.
MarketOnce runs all three from a single practice, underwritten by one shared capability: verified data and decision analytics. The finding a diligence team surfaces in week two is the same finding the operating team acts on during the hold, and the same finding a banker defends in the CIM three years later.
One thesis. One evidentiary record. One firm accountable for the whole of it.
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Four steps. No shortcuts.
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The most expensive line item on any diligence budget is the question that should not have been put to field. We hold a standard at the design stage that most firms only hold at delivery — and that is what clients return for, deal after deal.
Tell us what you need to decide.
New engagements typically open with a single, forty-minute scoping call. We will tell you, candidly, which stage of the engagement your question actually belongs to.
Selected clients, held in confidence.
MarketOnce serves a small, standing roster of private equity firms, investment banks, and consulting partners — most of it work we are not permitted to describe in detail, and none of it work we take lightly.
Fewer clients, held longer.
We do not staff to volume. Every client on this roster has a partner assigned to it by name, and most have been with the firm for years, not quarters.
The names below are shown with permission and represent a portion of the firm's standing relationships across private equity, banking, and consulting. Many of our most consequential engagements — live diligence, sell-side preparation, sensitive leadership assessments — are work no client will ever see us named in.
That is by design. Discretion is part of what is being bought.
Many of our most consequential engagements are work no client will ever name us in. We hold confidentiality as an operating standard, not a clause — and we expect our panelists, our talent, and our own partners to be held to the same.
A decision is waiting. Begin here.
Evidence that moved capital.
A small selection of engagements across the deal lifecycle, described in the detail our clients permit — sponsor names withheld, outcomes intact.
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Your process has a clock.
So do we.
Most engagements begin with a single, forty-minute scoping call. We will tell you, candidly, what evidence the decision actually requires.
A research house,
privately held, quietly run.
MarketOnce is the consolidation of twenty-five years of market-intelligence businesses built and acquired by the McGrath family — now organized as a single, integrated advisory serving private equity, banking, and consulting clients, with one standard of evidence.
Built by operators. Run by practitioners.
We were never an aggregator. We are a working firm, run by people who spent their careers inside the brands, agencies, and category teams we now serve.
The firm was founded in 1999 as a primary research practice serving brand teams who wanted answers faster than the incumbent research houses could deliver them. The same conviction has shaped every business added since: that evidence is only as valuable as the decision it informs, and that judgment is what the client is actually buying.
Over the following two decades, the family invested in adjacent disciplines — verified panels, activation, healthcare research, decision modeling — until the collection became, in practice, a single firm operating under several names.
MarketOnce is the acknowledgment of that fact. One firm. One standard: customer delight.
Twenty years, in brief.
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Four convictions the firm operates from.
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Practitioners, not principals-in-name.
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The firm publishes rarely. When it does, it is worth reading.
Method papers, category notes and the occasional letter from the founder. Distribution is by invitation; the archive is available to clients of record.
We hire the way we research.
Slowly, deliberately, and almost entirely through referral. If you are an entrepreneur, operator, brand builder, researcher, or technologist with a track record of building businesses — we are quietly interested.
Tell us what you need to decide.
New engagements typically begin with a single, forty-minute scoping conversation — held under NDA where warranted. We will tell you, candidly, which service is the right fit for your mandate.
Your engagement lead's direct line remains the fastest route. We are pleased to extend a partner-of-record to new requests on a current account.
Press inquiries are routed to the founder's office. Diligence requests from investors and acquirers are handled directly by a partner, under NDA.
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Discretion is part of the product.
Many of our most consequential engagements are work no client will ever name us in. Communications submitted through this form are treated as privileged from the moment they are received and access is restricted to the partner-of-record we propose for your engagement.
For mandates that require formal NDA before initial conversation, please indicate so in the field above. We will return a counter-signed agreement within one business day.
Measure twice. MarketOnce.
Trusted Intelligence for the decisions that matter most.
A McGrath Family enterprise.