Proprietary deal flow means one thing: you are the only buyer being asked for a number. Not that you found the company first, not that you have a list nobody else bought, not that an intermediary sent it to you before it went out broadly. Those are all useful. None of them is proprietary.
The distinction matters commercially, because the market sells all four under the same word, and only one of them changes what you pay and how much time you get.
What counts, and what does not
Run this test on anything described to you as proprietary: is anyone else being asked for a number at the same time?
- A company with no advisor, no timeline and no other bidder — proprietary.
- An off-market target you sourced, approached, and who is now also talking to two other sponsors who approached them the same quarter — not proprietary, and you will find out late.
- A listed deal an advisor sent you a week before the broader teaser — not proprietary, just early. Valuable, and a different thing.
- A list of five hundred founder-owned companies in your sector — an input, and one your competitors can buy from the same vendor.
That last one is where most of the confusion sits. Below $10M of EBITDA the addressable universe in any one sector and geography is small — often a few hundred companies. Several firms are working the same names. A list is not an advantage; what you do with it over eighteen months is.
Why the sub-$10M market makes this harder, not easier
The received wisdom is that smaller companies are easier to reach proprietarily because they are less intermediated. Half true, and the half that is false is expensive.
Owners at this size have no reason to answer. There is no process, no advisor fielding calls, no deadline. Your approach is an interruption in a week that already has too much in it. The person you are calling is usually also the person running operations that day.
The decision is not financial. A founder at this size is deciding whether to stop doing the thing they have done for twenty-five years. The trigger is almost never a valuation — it is health, a partner leaving, a child who does not want the business, a bad year that made the next ten look longer, or a competitor selling and making the number real. You cannot schedule any of those, and you cannot create them.
The sector is small and people talk. A clumsy approach does not just fail with that owner. It gets repeated at the trade association meeting. This is the specific reason volume-first outreach is a poor strategy below $10M: the cost of a bad approach is not zero, it is negative, and it compounds across the exact universe you are trying to work.
What actually produces it
Three things, in this order.
1. A mandate specific enough to be memorable. Not "industrials in the Southeast". Sectors, geography, revenue and EBITDA floors, ownership profile, structure, and the exclusions. This matters for proprietary sourcing for a non-obvious reason: it determines what an owner hears in the first ten seconds. "We buy commercial HVAC businesses in the Southeast and keep the team" is a sentence a founder can place. "We are a private equity firm interested in your sector" is a sentence they have heard from nine people this year.
2. Sustained, specific, low-volume outreach. The firms that get proprietary conversations are not sending more mail than everyone else. They are sending mail that demonstrates the sender knows what the company does, and they are sending it again six months later without treating the silence as rejection. The unit of measurement is quarters, not weeks.
3. Something to say when the answer is "not yet." Most first conversations end here, and "not yet" is the most valuable outcome available. It means the owner has not ruled you out; they have told you the timing is wrong. What separates firms that convert proprietary flow from firms that merely generate it is whether anyone is tracking that conversation eighteen months later, when the thing that makes it "yet" finally happens. Most lower middle market deals do not fail on fit. They fail on timing.
The economics nobody puts in the pitch
Proprietary sourcing is the slowest and most expensive channel per deal, and it is worth doing anyway.
Response rates are low. The interval between first contact and a transaction is long. Campaigns produce nothing for stretches that feel like failure and are not. The work is volume with a delayed and noisy signal, which is precisely the kind of work a two- or three-person deal team abandons first, because there is always a live deal in front of them that needs attention today.
This is the honest case for outside capacity, and also the honest case against it: if you are not going to sustain it, do not start it. A proprietary program that runs for two quarters and stops has paid the entire cost — the outreach, the burned first impressions, the opportunity cost of the hours — and collected none of the benefit, which arrives in year two.
What you actually get when it works
Not, primarily, a lower price. The reliable advantages are:
- You set the timeline. No bid date, no data room closing, no five other buyers compressing your diligence into three weeks.
- You can structure for what the owner wants. Transition period, employee treatment, a rollover, a seller note, the building. In a competitive process those are dimensions you compete on badly; in a proprietary conversation they are often what wins it.
- You learn the business properly. The single biggest predictor of a bad lower middle market acquisition is the buyer not understanding how the company really makes money. Time is the thing that fixes that, and proprietary is the only channel that gives you any.
Price discipline follows from having nobody to bid against. It is a consequence, not the thesis.
Where proprietary fits in a covered pipeline
It is one channel of four, and it is the one that fails on the longest timescale — which is exactly why it should not be the only one. Most workable deals below $10M of EBITDA are intermediated; fewer than 20% of broker-listed deals ever reach the buyers who would actually want them, so intermediated coverage is a distribution problem worth solving in parallel rather than a market to write off. The full breakdown is in how private equity firms find deals in the lower middle market.
Any claim that a sourcing product is proprietary-only should be read carefully. So should ours: OmniSource covers Off-Market, Pre-Market and On-Market, and the off-market channel is one third of that, not the whole pitch. BizNexus's broader treatment of the discipline is at deal origination.
The short version
Proprietary deal flow is a relationship with an owner ahead of a decision. It cannot be bought, it does not transfer, it runs on a timescale that embarrasses quarterly reporting, and it is the only channel where nobody else is being asked for a number.
Everything else sold under that name is a list.