Lower middle market deal flow comes from four channels: intermediated listings, pre-market engagements, proprietary outreach, and the firm's own network. Most firms are genuinely strong in one of the four and effectively blind in the rest — which is why two firms with the same buy criteria can look at completely different markets and both believe they are seeing everything.
Here is what each channel actually produces, and what it costs.
1. Intermediated listings — the volume, and the competition
Below roughly $10M of EBITDA, most sellers who run a process run it through a broker or an M&A advisor. That makes listings the highest-volume channel by a wide margin, and the one every firm claims to cover.
Almost none do. Coverage here is not a discovery problem — the deals are visible — it is a distribution problem. Fewer than 20% of broker-listed deals ever reach the buyers who would actually want them, because an intermediary works from the buyer list they already have. Being on that list is the entire game, and it is decided by whether the advisor thinks you will close, not by whether the deal fits you. That is a relationship and a reputation, not a subscription.
What it costs: time spread across a lot of advisors, most of whom will never send you anything. What it yields: pace. A listed deal moves in weeks.
2. Pre-market — the narrow window worth the most
An advisor has signed the engagement. The teaser has not gone out. Somewhere between those two events is a window — days to a few weeks — where a buyer who is obviously right for the deal can get in front of it before it becomes a process.
This is the least understood channel and, per hour, usually the most valuable. It is not a database. It exists only where an advisor knows your criteria precisely enough to think of you unprompted, which means the work is upstream: being specific, being known, and being easy to say yes to.
What it costs: the same relationship work as channel 1, plus a written mandate an advisor can act on without a call. What it yields: priced competition instead of an auction.
3. Proprietary outreach — the slowest and the cleanest
A company that has not started a process. No advisor, no timeline, no other bidder. This is what everyone means by "proprietary deal flow", and most of what gets sold under that name is not it — a list of companies nobody else has bought is not proprietary flow, it is a list. Proprietary flow is a relationship with an owner ahead of a decision.
The economics are brutal and worth understanding before you fund it. Response rates are low. The gap between a first conversation and a transaction is measured in months, often across an ownership event you cannot schedule — a health scare, a partner leaving, a bad year, a good offer for a competitor. A campaign that produces nothing for two quarters is not necessarily failing.
What it costs: sustained volume with a long feedback loop, which is exactly what a two- or three-person team runs out of first. What it yields: the deals you did not compete for.
4. The firm's own network — the best conversion, the worst scale
Prior sellers, portfolio operators, lenders, accountants, the person who ran the last add-on. This channel converts better than anything else because trust is already there. It also does not scale, cannot be bought, and is invisible to everyone outside the firm.
What it costs: nothing you can budget, and years you cannot compress. What it yields: the highest hit rate in the business, at a volume you cannot plan around.
Why most firms are covered in one channel and blind in three
Because the four channels need different work, and a deal team is one group of people with one set of hours.
A partner with twenty years of advisor relationships is strong in channels 1 and 4 and has no time for 3. A firm that bought a data platform is strong at the top of channel 3 and never built the outreach capacity to convert it. A newer team with capital and no history is weak in 1 and 4 by definition, and usually over-invests in 3 because it is the only channel you can buy.
The practical consequence: the channel a firm is weakest in is invisible to it. You cannot see the deals you never heard about, so a thin channel does not feel thin — it feels like the market is quiet.
What a covered pipeline looks like
One mandate, written down, specific enough that an advisor can act on it without a call: sectors, geography, revenue and EBITDA floors, ownership profile, structure, and the exclusions that actually matter. Then all four channels run against it continuously, with the results landing in one place rather than four inboxes.
The mechanics matter less than the fact that it is one pipeline. A deal that arrives from an advisor and a deal that arrives from an outreach campaign are the same deal to a partner; they should not live in different systems or be worked by different rules.
That is the design of OmniSource: coverage across Off-Market, Pre-Market and On-Market in a single pipeline scored against your mandate, with an origination team running the outreach and the follow-up. If you are running an add-on program with a small team, the corporate development view is the closer fit. BizNexus's broader treatment of the discipline is at deal origination.
The part nobody puts in a deck
None of this produces a deal on a schedule. The channels fail in different ways and on different timelines, which is the actual argument for running all four: when proprietary outreach is quiet, listings are not; when listings are picked over, an advisor you have been specific with for two years calls you before the teaser goes out.
A firm that runs one channel well is not covered. It is lucky, on a lag.