The $3 Billion Industry Most People Have Never Heard Of

There’s an industry worth around $3 billion that shapes some of the biggest decisions in business, finance, and technology, and almost nobody outside those rooms knows it exists.

It has no flashy consumer brand. You won’t see its ads during a football match. Yet before a private equity firm spends hundreds of millions buying a company, before a consulting team advises a Fortune 500 board, and before a hedge fund makes a large bet, there’s a good chance this industry quietly did some of the homework.

It’s called the expert network industry. And once you understand how it works, you start seeing its fingerprints everywhere.

So what actually is an expert network?

Think of it like this. A firm needs to understand something very specific and very fast, say, how hospital procurement teams really choose between two medical device suppliers. You can’t Google that. Analyst reports are too generic. Surveys take weeks.

So instead, they call an expert network. Within a day or two, they’re on a one-hour phone call with someone who has spent 15 years actually running hospital procurement. Real experience. First-hand knowledge. The kind of insight that never makes it into a report.

That’s the whole business: connecting people who need answers with people who lived the answer. Former executives, engineers, doctors, regulators, buyers, operators, vetted, screened, and matched to a specific question through structured in-depth interviews.

How it quietly became a $3 billion market

Here’s the part most people miss. This isn’t new, and it isn’t small.

The modern expert network was pioneered back in 1998, and for years it stayed a well-kept secret, reportedly a “secret weapon” used mostly by hedge funds looking for an edge. Then it spread. Private equity firms picked it up. Consulting firms made it standard. Corporate strategy teams followed.

Today the global market sits at roughly $3 billion, and it’s been compounding at around 16% a year for a decade. Projections put it near $4.86 billion by the end of 2026. That’s not a niche curiosity anymore, that’s an entire hidden layer of the knowledge economy.

The biggest names you’ve probably still never heard of: GLG, which claims a network of over a million experts. AlphaSights, which raised $400 million in 2024 at a reported $4.2 billion valuation. Third Bridge, Guidepoint, Tegus/AlphaSense, plus a wave of specialist firms competing on speed and precision. (If you want the full breakdown, here’s how the top expert network companies compare.)

Who’s actually using this, and why

The users tell you a lot about why it matters.

• Consulting firms are the heaviest users, making up close to half of all activity.
• Private equity is right behind, often conducting 5 to 15 expert calls before a single investment decision.
• Hedge funds, corporates, and strategy teams fill out the rest, in fact, over 11,000 firms now rely on expert networks for better insights.

Why do they bother? Because the cost of a wrong decision is enormous. When you’re about to spend $200 million acquiring a company, a few conversations with people who genuinely know the market is the cheapest insurance you’ll ever buy. Expert networks compress weeks of research into days, and in deal-making, days are money.

Why almost no one has heard of it

If it’s this big and this important, why is it invisible?

Three reasons.

First, it’s strictly B2B. Expert networks don’t sell to you and me. Their clients are institutions, and their work happens behind NDAs and closed doors.

Second, the whole point is discretion. Firms use these insights to gain a competitive edge, the last thing they want is to advertise how they got it.

Third, most of these companies are privately held and rarely disclose their numbers, so they simply don’t show up in the headlines the way a public consumer tech company would.

Put those together and you get a multi-billion-dollar industry hiding in plain sight.

Where it’s heading next

The industry isn’t just growing, it’s evolving fast. AI is now being used to match the right expert to the right question in a fraction of the time, cutting sourcing time by up to 40% at some firms. But here’s the interesting twist: as AI generates more and more content, the value of a real human who actually did the work goes up, not down. You can’t fake 15 years of frontline experience.

That’s why demand keeps climbing. In a world drowning in generic information, first-hand expertise is becoming the scarce resource, and expert networks are the ones who can find it on demand.

The takeaway

The next time you read about a major acquisition, a bold strategy shift, or a confident market bet, there’s a decent chance an expert network was working quietly in the background. It’s a $3 billion industry built on one simple idea: the fastest way to understand something is to talk to the person who’s already been there.

Most people have never heard of it. Now you have.