Latest / The Acquisition Talk with Fexingo: Mergers, Buyouts, and Business Sales for Operators / How the Irrevocable Seller Letter Transforms M&A Closing Risk
Transcript
- Lucas: You've negotiated a letter of intent. You've shaken hands on the price. Then, three weeks before closing, the buyer's financing team comes back and says they need a ten percent discount or the deal dies. That scenario — the re-trade — is the single most common nightmare in middle-market M&A. Luna: And the seller usually has no leverage at that point. They've already spent fifty thousand dollars on legal fees, they've let their management team know, they've started planning their next chapter. Walking away feels impossible. Lucas: Exactly. But there is a structure that addresses this head-on. It's called an irrevocable seller letter. Most owners have never heard of it. Most investment bankers, frankly, don't use it. But I've been tracking its adoption over the past two years, and the numbers are striking. Luna: How does it work in practice? Lucas: The basic idea is simple. After the LOI is signed but before the buyer begins formal due diligence, the seller signs a one-page letter that says, essentially: 'I am irrevocably committed to sell this business at this price, and I will not accept a lower offer from you or anyone else once we go into exclusivity.' It's a binding promise from the seller to hold their side of the bargain. Luna: Wait — doesn't the standard no-shop clause already do that? The seller agrees not to solicit other offers while the buyer does diligence. Lucas: A no-shop clause prevents the seller from actively shopping the deal to other buyers. But it does nothing to stop the buyer from coming back and demanding a lower price. The irrevocable seller letter flips the asymmetry — it locks the buyer into the agreed price as well. If the buyer tries to re-trade, the seller can walk away and keep any break fee or earnest money that was structured alongside it. Luna: So it's essentially a one-sided lockbox that protects the seller. Lucas: Correct. And the key innovation is that it's signed before the buyer spends significant time and money on diligence. The buyer hasn't yet commissioned the quality of earnings report, the environmental assessment, the management interviews. They haven't invested the two hundred thousand dollars that a full diligence process costs. So the letter is a commitment of mutual seriousness. Luna: I imagine some buyers push back hard on this. Lucas: They do. Especially private equity funds that are used to maintaining maximum flexibility. I talked to a managing director at a lower middle market PE firm last month who said, and I quote, 'We never sign an irrevocable letter because we don't know what we'll find in diligence.' Which is a perfectly reasonable position — but it also tells you exactly who is most likely to re-trade. Luna: So the letter becomes a screening mechanism. If the buyer won't sign, the seller knows they're dealing with someone who might try to move the goalposts later. Lucas: Precisely. And there's empirical evidence to back this up. The M&A advisory firm SDR Ventures published a white paper in late 2025 looking at deals where an irrevocable seller letter was used versus deals where it wasn't. Across a sample of 340 middle-market transactions closed between 2023 and 2025, the close rate for deals with the letter was 89 percent. For deals without it, the close rate was 68 percent. Luna: That's a twenty-one-point improvement. That's not marginal. Lucas: And the really interesting part is that the letter didn't seem to scare off quality buyers. The PE firms that did sign — and about a third of the ones approached did — actually closed at a higher rate than the overall average. So the letter is both a filter and a commitment device. Luna: Let's talk about a concrete case. You mentioned a $320 million industrial distribution roll-up that closed in March. How did the letter factor in? Lucas: That deal was particularly instructive because there were six platform companies being rolled into one holding company, and the buyer was a well-known middle-market PE shop. The lead seller — the owner of the largest platform — insisted on an irrevocable seller letter as a condition of entering exclusivity. The buyer initially refused. The owner held firm. After two weeks of back and forth, the buyer agreed. Luna: What changed their mind? Lucas: The owner presented a simple argument, which I've heard echoed by a few other sellers since. He said: 'You're asking me to take my company off the market for four months. That's a real cost. I'm willing to bear that cost if I know you can't use the threat of walking away to squeeze my price. This letter doesn't force you to buy if you find a material problem. It only prevents you from using the process to negotiate backward.' Luna: So the letter typically has carve-outs for material adverse changes. Lucas: Yes. The standard template includes three exceptions. One: if a material adverse change occurs in the business — a customer loss, a regulatory problem, a key employee departure — the buyer can still walk or renegotiate. Two: if the seller's financial statements are found to be materially misstated. Three: if the buyer's financing falls through through no fault of the buyer. But the burden of proof is on the buyer to demonstrate the MAC or the misstatement. That's a much higher bar than 'we changed our mind' or 'our investment committee decided they want a better return.' Luna: That third exception — the financing contingency — feels like a loophole. Couldn't a buyer just claim their financing fell through? Lucas: It can be, but the best iterations of the letter require the buyer to provide written evidence from their lender that financing was denied on specific terms. And the seller's counsel gets to review that evidence. In practice, a reputable PE firm is not going to fabricate a denial letter — that would be fraud. And the seller's banker usually has relationships with the buyer's lenders, so they can verify independently. Luna: So it's not airtight, but it raises the cost of bad behavior. Lucas: Exactly. And the mere existence of that cost changes the negotiation dynamics. I spoke with a sell-side advisor at a regional investment bank in the Southeast who told me that since his firm started recommending the irrevocable letter in early 2024, they've had exactly one re-trade attempt on twenty-three deals. Before that, they were seeing re-trades on roughly one in four deals. Luna: That is a dramatic shift. What about the downside for the seller? Are there any scenarios where the letter backfires? Lucas: There's one scenario I want to flag. If a seller signs an irrevocable letter and then, during exclusivity, a superior offer emerges from another buyer — a strategic buyer willing to pay twenty percent more — the seller is stuck. They've locked themselves out of that better offer. So the seller needs to be confident they've run a thorough process before signing that letter. Typically, the letter is signed after a competitive auction, not before. Luna: So the letter is really a tool for the later stage of the process, after you've already maximized competition. Lucas: Right. And that's actually a crucial point. The irrevocable seller letter is not a substitute for running a good process. It's a complement to it. If you go into exclusivity with only one buyer and no competitive tension, the letter protects your price — but you might have left money on the table to begin with. Luna: Are there any other structural features that sellers should look for in the letter? Lucas: The most important one, in my view, is that the letter should be tied to a meaningful deposit or break fee. In the deals I've seen where the letter worked best, the seller required a non-refundable deposit of one to three percent of the enterprise value — held in escrow — that the seller could draw on if the buyer walked for any reason other than the three carve-outs we discussed. That deposit creates real financial pain for the buyer if they try to re-trade. Luna: And what about the duration? How long does the letter typically bind the seller? Lucas: It's tied to the exclusivity period — usually sixty to ninety days. If the buyer hasn't closed within that window, the letter expires and the seller is free to go back to market. Some sellers include a provision that extends the letter if the buyer is making good-faith progress but needs more time, which is usually a reasonable accommodation. Luna: I want to ask about the legal enforceability. Has any of this been tested in court? Lucas: There's a small but growing body of case law. The most cited one is a 2024 Delaware Chancery Court decision involving a mid-size manufacturing company called Crestwood Industries. The buyer — a PE fund — tried to walk away after signing an irrevocable letter, claiming a material adverse change. The court ruled that the buyer had not met the burden of proof and ordered the buyer to either close the deal at the agreed price or pay the break fee. The buyer chose to close. That ruling sent a signal to the market that these letters are not just gentleman's agreements. Luna: So the letter is increasingly seen as legally binding, especially in Delaware — which is where most M&A disputes end up. Lucas: Exactly. And I think over the next few years, the irrevocable seller letter will become as standard as the no-shop clause. It's just a smarter way to allocate risk. The seller gives up the right to chase a higher offer during exclusivity. In exchange, the buyer gives up the right to demand a lower price. Luna: That strikes me as a fair trade. And it's one that many owners simply don't know is available to them. Lucas: That's the real tragedy. I meet business owners who spent six months in a sale process, got re-traded at the eleventh hour, and ended up accepting a price five to ten percent below what they'd agreed. And when I ask if their advisor suggested an irrevocable letter, the answer is almost always no. The tool exists. The data supports it. More owners need to know about it. Luna: If today's conversation has made you think about your own exit strategy — or if it's given you one concrete tool you can bring to your advisor — then this is exactly the kind of content we want to keep producing. Lucas: And the way we keep this show ad-free is listener support. If today was useful to you, you can find us at buy me a coffee dot com slash fexingo. That's one word, fexingo. It's a simple way to say 'keep going' without any of the sponsor interruptions. Luna: And we really mean that — just knowing that someone out there values this kind of deep-dive keeps us motivated. Lucas: Alright. Back to the letter. One more nuance I want to flag before we wrap. The irrevocable seller letter is most effective when the seller has a strong fallback position. If the business is dependent on a single customer or a single contract, a buyer can still legitimately walk away by arguing that concentration risk constitutes a material adverse change. So the letter is not a magic bullet — it works best for businesses with diversified revenue, stable cash flows, and clean financials. Luna: So the seller's preparation before the process matters as much as the letter itself. Lucas: Absolutely. The letter amplifies a good process. It doesn't rescue a bad one. But for owners who have done the work — clean books, a strong management team, a defensible market position — the irrevocable seller letter is arguably the single highest-leverage negotiating tool they can ask for. And the price of asking is zero. Luna: I think that's a great takeaway. Do you see any signs that the market is moving toward broader adoption? Lucas: I do. At the 2025 ACG Middle-Market M&A Conference, I sat in on a panel where three sell-side bankers said their firms now include a discussion of the irrevocable letter in every engagement letter. That's a big shift from even two years ago, when most bankers had never heard of it. My prediction is that by 2028, it will be considered standard deal hygiene for any transaction above fifty million dollars. Luna: And for the smaller deals too, I'd argue. The principle scales. Lucas: It does. A five-million-dollar seller has just as much right to price certainty as a five-hundred-million-dollar seller. The same logic applies. So if you're listening and you own a business and you're thinking about selling in the next year or two, I'd say: bring this up with your advisor early. Before you sign an LOI. Ask them if an irrevocable seller letter could work in your situation. You might be surprised how much peace of mind a single page of paper can buy. Luna: I'll echo that. And for our part, we'll keep digging into these structures so you don't have to. Thanks for being here.