In 2015, the average B2B buying group had 5.4 stakeholders. In 2025, that number is between 8 and 13 depending on segment, and enterprise committees routinely exceed 17 to 20. The buyer side has nearly doubled in size in a decade. The seller side has mostly added more dashboards.

The numbers come from a synthesis of Gartner research, and the implications are larger than most sales organisations have absorbed. The deal strategy that worked when there was a champion and an economic buyer is structurally undersized when there are nine stakeholders, three of whom have veto authority and none of whom have ever met your seller.

“You can run perfect single-thread selling in a multi-threaded market and still lose. The deal isn’t your relationship with the champion any more. It’s whether the buying group can reach consensus with you in it.” — Mark Southgate

The fix is not “multi-thread harder.” It is a different way of thinking about deal strategy, deal reviews, and the operating cadence that supports both.

What the bigger committee actually changes

Three structural shifts come with the committee growth.

Shift 1: consensus, not approval, is the bottleneck. With 5.4 stakeholders, deals get blocked by a single hard-no. With 8 to 13 stakeholders, deals get blocked by failure to converge. The committee has eight different definitions of success and cannot agree on which one matters. The seller’s job is no longer to convince a buyer. It is to help a buying group find consensus, on a timeline.

Gartner’s 2025 survey work found that 74 percent of B2B buying teams demonstrate “unhealthy conflict” during the decision process. The committees are not aligned. The losses you are absorbing are increasingly losses of consensus, not losses of preference. The deal team often does not know this because they only ever spoke to two people.

Shift 2: the seller’s relationship coverage no longer matches the buyer’s decision coverage. A seller with strong relationships with the champion and the economic buyer has covered two of the nine to thirteen decision-relevant stakeholders. The other seven to eleven are receiving information about your product from the two stakeholders you have met. That is not coverage. That is an inherited narrative whose accuracy nobody is verifying.

Shift 3: when the committee does converge, the outcome is far more durable. The same Gartner research notes that buying groups reaching consensus are 2.5 times more likely to call the decision a high-quality one in hindsight. They also expand more, renew more, and refer more. The deal strategy that helps the committee converge is not only more likely to win — it builds the customer relationship that produces every other revenue line.

As Mark Southgate puts it: “The deal you win by helping the committee reach consensus is worth two of the deals you win by getting around the committee.”

What “multi-thread” usually means, and why it isn’t enough

“Multi-thread” has become shorthand for “the rep has more contacts in the CRM.” That is not the same thing as multi-threaded selling, and the deal reviews that focus on it tend to produce performative coverage rather than strategic coverage.

The version that works has three properties:

  1. Each stakeholder is mapped to a specific decision role. Not “VP of Engineering, met once.” More like: “VP of Engineering — has veto authority on architecture compatibility, last engaged 12 days ago, has a written-down concern about migration risk that we have not yet addressed.”
  2. The rep can articulate what each stakeholder needs to be true to vote yes. Not what they need to know. What they need to be true. These are different. “Knowing that we have SOC 2” is information. “Believing that our security posture will pass our internal compliance review” is the buyer’s actual condition.
  3. The deal team has a strategy for the stakeholders they have not yet met. This is the move most deal strategies miss. Stakeholders the seller has never met are not absent from the deal. They are receiving information about the deal from the stakeholders the seller has met. The strategy for unmet stakeholders is at least as important as the strategy for met ones.

What deal reviews have to change

The deal review forum that was built for champion-plus-buyer selling does not work for committee selling. The questions are wrong.

A useful deal review in the committee-sized world inspects four things:

  1. The decision map. Who in the buying group has what authority, and what are they each measuring? If the deal team cannot produce this in three minutes, the deal is being run on assumption.
  2. Coverage versus authority. Where does the deal team’s relationship coverage match the buyer’s decision authority, and where is it missing? The gaps are where the deal slips.
  3. The consensus path. What is the buyer’s process for reaching agreement, and where is the deal team helping that process versus relying on the champion to handle it internally? Champions who handle consensus internally lose roughly half the time. Deal teams that help the buyer build consensus win at a rate well above baseline.
  4. The dissent that has not yet surfaced. If the deal team thinks every stakeholder is aligned, they are wrong. Some dissent is private, and the seller’s job is to surface it where it can be addressed. The deal team that cannot name the most likely source of internal pushback is operating without a key piece of intelligence.

This is the work of deal review redesign. The forum is the same. The questions are different. The output is different.

“Most deal reviews would survive a buying group of three people. They do not survive a buying group of thirteen. The forum has to grow with the buyer.” — Mark Southgate

The forecast implication

This shift has a forecast consequence that is rarely discussed.

In committee-sized deals, the slip risk is not random. It correlates almost perfectly with stakeholder coverage. Deals where the seller has mapped and engaged the majority of the decision-relevant stakeholders close roughly on time. Deals where the seller has covered fewer than half of them slip, often by a full quarter.

If the forecast call is treating these two types of deal as equivalent — both in “commit,” both with similar weighting — the forecast will be wrong, predictably, in one direction.

The forecast category that holds in the committee era includes coverage as a criterion, not just deal age and seller confidence. “Commit” requires verified coverage of the decision-relevant stakeholders. “Best case” requires a credible plan to reach the missing ones in the time available. Anything else is pipeline, not commit.

The capacity implication

The other consequence is on capacity planning. A rep running deals with 8 to 13 stakeholders cannot carry the same number of opportunities as a rep running deals with 5. The per-deal effort to maintain coverage is higher. The deals take longer. The opportunity load has to be smaller.

Most quota plans have not adjusted for this. The same rep is being asked to run more deals, each of which has more stakeholders, with the same calendar. The math does not work, and the work either gets thinner (less coverage per stakeholder) or the deals slip (less frequent contact with each).

This is where capacity planning and deal strategy meet GTM strategy. The opportunity load has to match the per-deal effort that the current buyer demands. Both numbers have moved. The plan rarely catches up.

The diagnostic

If you want to know whether your deal strategy has caught up with the buying group of 2026, ask one question of any senior deal review:

“For this opportunity, name every stakeholder with influence on the decision, the specific authority they hold, the last meaningful engagement we had with each, and our explicit plan for the ones we have not yet met.”

If the answer takes longer than four minutes, or covers fewer than seven stakeholders on an enterprise deal, the deal strategy is operating on a buyer model that no longer exists. The committee doubled. The deal strategy has to match it.

The companies that adjust win more, slip less, and expand more. The ones that do not are running 2015 plays into a 2025 market. The buyer noticed. The seller is still catching up.