Short answer: A deal "goes dark" when one side stops responding, usually because something changed that nobody has said out loud: the numbers in diligence differ from the CIM, financing got harder, the seller is having second thoughts, or the process simply has no owner. You get a deal to close by finding those problems early, writing down who owes what by when, and talking about the uncomfortable item in the first week it appears, not the fifth.
This guide is for buyers and sellers in small and lower-middle-market acquisitions, and for the advisers who run them. It uses the M&A meaning of "deal management": running the steps from a signed letter of intent to a signed purchase agreement and funds moved. The same habits apply to large B2B sales, and we note where they differ.
The usual reasons a deal goes dark
There is no reliable public statistic on how many small deals fail after the letter of intent, so we will not quote one. What practitioners describe is consistent, though, and the reasons fall into a few groups.
| Reason | What it looks like | What usually fixes it |
|---|---|---|
| Diligence finds a gap | Buyer goes quiet after receiving financials or a QoE draft | Name the issue, quantify it, propose a price or structure change |
| Financing slows | Lender asks for more, timelines slip, buyer avoids dates | Early lender involvement, a financing timeline in writing |
| Seller remorse | Slow document uploads, new conditions, "my accountant is busy" | A direct conversation about what the seller needs after closing |
| No process owner | Requests sit in email, nobody tracks open items | One owner, one tracker, a fixed weekly call |
| Third-party consents | Landlord, key customer or licensor has not agreed | Identify required consents at LOI, start them early |
| Working capital dispute | Argument over the peg late in the process | Agree the method early, with a monthly history |
| Fatigue | Both sides exhausted, no deadline pressure | Exclusivity end date and a dated closing plan |
Most of these are visible weeks before the silence. The silence is the symptom.
Warning signs to watch for
- Response time stretches. Replies that took a day now take a week. Note it on your tracker; it is data.
- New people join late. A spouse, a new adviser, a second lender. Each one restarts part of the conversation.
- Requests get "partial" answers. Half a list, one year instead of three, a summary instead of the source document.
- Dates move without a reason. "Let's push the call" twice in a row means something is wrong.
- The other side stops asking questions. A buyer who has stopped asking questions has often stopped buying.
A deal management routine that gets to close
Deal management is not software first. It is a small set of habits. Tools help you keep them.
1. One owner and one list
Every open item lives on one tracker: the request, who owns it, the date it is due, and its status. Email is where requests get lost. A shared spreadsheet is enough for a small deal. Some teams use a data room's Q&A feature or a deal management platform, which is fine as long as everyone uses the same one.
2. A dated closing plan at LOI
When the letter of intent is signed, write the plan backwards from the target closing date: diligence workstreams, QoE, legal drafting, financing approval, consents, and the closing call. Our guide on how long due diligence takes helps size each step, and the letter of intent guide covers exclusivity, which sets the outer deadline.
3. A fixed weekly call
Thirty minutes, same time every week, with the tracker on screen. The agenda is the tracker. The call is where you raise a problem while it is small.
4. Bad news in week one
When diligence finds something, say so quickly and specifically. "Revenue from the largest customer fell in the last quarter, and here is how it affects our view of value" is a conversation. Three weeks of silence followed by a lower offer is a broken trust. If you need to understand how earnings issues are tested, see quality of earnings explained.
5. Settle the method for hard numbers early
The working capital peg, the treatment of debt-like items and any earn-out mechanics cause late disputes. Agree how they will be calculated before the numbers are known. Our net working capital peg guide walks through the method.
6. Start consents and financing on day one
If a landlord, licensor, franchisor or major customer must consent to the change of control, list them at LOI and contact them as soon as the parties agree it is time. Lenders work to their own calendar; ask for theirs in writing.
7. Look after the seller
For many owner-run businesses, the seller is selling part of their life's work. Seller remorse is normal and is often about the future, not the price: what happens to staff, what their role will be, how they will be treated. A management meeting that respects that is part of closing the deal.
A closing checklist
- Purchase agreement agreed, including disclosure schedules.
- Financing committed in writing, with conditions met.
- Third-party consents received.
- Working capital estimate agreed, with the true-up method.
- Employment or consulting agreements for key people signed.
- Transition services or handover plan written.
- Funds flow memo agreed by both sides.
- Signatures, wires and announcements scheduled for the closing day.
- Access to systems, bank accounts and domains transferred, with a list of who holds which credential.
How this differs from a B2B sales deal going dark
In a large B2B sale, "going dark" usually means the buyer lost budget, priority, or an internal champion. The fixes look similar: a mutual action plan with dates, one owner on each side, early contact with whoever signs, and a direct question when the silence starts ("Has something changed in your priorities?"). The difference is that in M&A both sides are usually committed by an exclusivity period and a letter of intent, so silence is often a negotiation signal rather than lost interest.
Where AI helps, and where it does not
AI tools can take some of the slow reading out of the middle of the process: summarising a data room, flagging documents that are missing from a request list, and comparing CIM claims with the financial statements. That shortens the time before the hard conversation, which is often what keeps a deal alive. It does not replace the conversation. Deal OS, our own due diligence tool, reads deal documents and returns cited findings so the deal team can check each point and raise it early. If you are building your request list, start with the M&A due diligence checklist.
Frequently asked questions
What does it mean when a deal goes dark? One side stops responding or keeps moving dates without a clear reason. It usually means something changed, such as a diligence finding, a financing problem or seller second thoughts, that has not yet been said openly.
What is deal management in M&A? Running the steps from a signed letter of intent to closing: the request list, diligence workstreams, financing, consents, legal drafting and the closing call. It needs one owner, one tracker of open items and a dated plan.
How do you revive a deal that has gone quiet? Ask a direct question about what has changed, name the open issue you think is behind it, and propose a concrete next step with a date. If the issue is value, bring numbers and a structure option, not only a lower price.
What causes most delays between LOI and closing? Practitioners commonly point to diligence findings that change the view of value, slow financing, third-party consents, working capital disputes and the lack of a single process owner. Most are visible weeks before the deal stalls.
Do I need deal management software for a small acquisition? Not necessarily. A shared tracker, a data room with Q&A and a fixed weekly call cover most small deals. Software helps when you run several deals at once or need an audit trail across a team.