Global M&A fell below a trillion dollars in the quarter the ten-year yield passed 5 percent.

What happened to global M&A in the third quarter of 2026?

It fell below a trillion dollars. LSEG data reported by Reuters on 2 October 2026 put global M&A in the third quarter at $993 billion, down 41 percent on the second quarter and the first quarter under $1 trillion since the second quarter of 2025.

Ten deals of more than $10 billion were announced in the quarter, the fewest in any quarter since the fourth quarter of 2024. Reuters reports that dealmaking in the United States and Europe fell sharply, while Asia-Pacific M&A reached $242 billion, up 8 percent on the second quarter and 36 percent on the same quarter a year earlier.

The year to date still reads as a strong one. On the same data, worldwide M&A stands at $3.9 trillion, up 28 percent, while the number of deals is down 8 percent, a level Reuters says has not been seen since 2020. Private equity-backed dealmaking is having its strongest year to date by value since records began in 1980, though it too slowed in the third quarter against the same quarter of 2025.

Two pieces of arithmetic are ours. A 41 percent fall to $993 billion implies a second quarter of about $1.68 trillion. And $993 billion is about a quarter of the $3.9 trillion year to date, where an even spread would put a third in each quarter.

A companion article published yesterday, on Mergermarket's nine-month figures, could give only a bound for the third quarter: less than 28 percent of that provider's total. LSEG's figure sits inside that bound. The two providers do not count the same set of transactions and their totals differ, so we set them side by side and do not reconcile them.

How far did the ten-year Treasury yield rise in the quarter?

By 0.85 of a percentage point. The Federal Reserve's daily series puts the ten-year Treasury yield at 4.44 percent on 30 June 2026 and 5.29 percent on 30 September. Reuters reports that it reached 5.34 percent on 1 October, its highest level since 2002.

Most of the move came late. On the same series the yield was 4.75 percent at the end of August. It first closed at 5.00 percent on 15 September, the day before the Federal Reserve raised its policy range to 3.75 to 4.00 percent, and added another 0.29 of a point in the two weeks that followed.

Reuters describes the quarter's rise as the biggest this century. On the Federal Reserve's published daily figures it is level, at two decimal places, with the rises of the fourth quarter of 2016 and the third quarter of 2022. Either way it is among the largest quarterly moves in the long rate in twenty-five years, and the 30 September close is the highest on that series since May 2002.

It also ran ahead of at least one published forecast. A companion article on this site recorded KKR raising its target for the ten-year yield to 5.1 percent for the end of 2026, in a note dated September 2026. The yield closed above that level on 23 September.

Did higher borrowing costs cause the slowdown in deals?

The figures do not show that. They show a sharp fall in deal value and a sharp rise in the long rate in the same three months. Reuters frames the slowdown around higher borrowing costs. The bankers it quotes are more careful than the headline.

Three things cut against a simple reading. The first is the base. The second quarter was unusually large, at about $1.68 trillion on our arithmetic, and a companion article records June as the highest month on Mergermarket's record. A fall from a peak is partly the peak.

The second is timing. The yield did not close at 5 percent until the middle of September. A transaction announced in July or August was negotiated in the spring, when the ten-year yield was nearer 4.4 percent. If the long rate is weighing on deals, more of that weight should show in the quarters ahead than in the one just ended.

The third is the people closest to it. One of the bankers Reuters quoted said higher yields make valuations a little tougher at the margins, that the effect is hard to quantify, and that he was not ready to call a slowdown. Sarah Jones, global head of corporate at the law firm Clifford Chance, described the quarter as a normalization after an extraordinary second quarter and not the end of a cycle. Carsten Woehrn, Goldman Sachs' co-head of M&A for Europe, the Middle East and Africa, said megadeals are continuing and that he sees total deal value exceeding the 2021 peak if the pace holds.

What can be said is narrower. The long rate ended September above any level it had reached while this year's announced transactions were being negotiated.

What does a higher long rate do to the price a buyer can pay?

It raises the return a buyer needs, and so lowers what the same cash flow is worth to that buyer. It does this through the valuation and through fixed-rate financing. The interest on a floating-rate acquisition loan follows the policy rate, which is a different number.

Start with valuation. Every buyer compares the return on a company with what a government bond pays for no risk at all. When the bond pays more, the company has to pay more too, and the only way a fixed stream of cash produces a higher return is at a lower price.

An illustration, and only that. A buyer who requires 13 percent a year from a company whose cash flow grows at 3 percent will pay 10 times that cash flow. Add 0.85 of a point to the required return and the same arithmetic gives about 9.2 times, some 8 percent less. No buyer's required return moves one for one with a Treasury yield, and no buyer prices a company from a single formula. The direction is what the example shows.

Then financing. Most loans used to buy mid-sized companies carry a floating rate, set off a short-term reference rate that tracks the Federal Reserve's policy range. That range rose by a quarter point on 16 September. The ten-year yield matters to the debt where the rate is fixed: bonds issued by large acquirers, long-dated loans against property and equipment, and the cost of swapping a floating rate for a fixed one.

So the two rates reach a deal by different doors. The policy rate arrives in the interest line of the buyer's model. The long rate arrives in the multiple. A seller who hears only that rates are up should ask which one the buyer means.

What should an owner preparing a sale do about a ten-year yield above 5 percent?

Nothing about the yield, and several things about how exposed the sale is to it. An owner cannot time the long rate. An owner can shorten the period in which a signed price is open to renegotiation, and can make the company's cash flow easy to underwrite.

The first is to ask each bidder how the price was built. A bid that depends on a particular amount of debt at a particular cost is a bid that can move between the letter of intent and closing. Ask what financing is committed, at what point it becomes committed, and what the buyer would do if its cost rose again.

The second is to expect the gap to be argued in structure before it is argued in price. When a buyer's required return rises faster than a seller's expectations adjust, the difference tends to show up as deferred or contingent consideration. Companion articles on this site cover the gap between what buyers bid and what sellers ask, and how a business is valued.

The third is speed after signing. A long rate that moved 0.85 of a point in one quarter can move again in the next. Every week between a letter of intent and a closing is a week in which the buyer's arithmetic can change. Diligence material that is ready on the first request shortens that window.

The fourth applies to an owner who is borrowing and not selling. A companion article sets out why the argument has moved from the next rate rise to the length of the hold. A long rate above the forecasts strengthens that case. It does not weaken it.

A note on what these figures are. The M&A figures are LSEG's as reported by Reuters on 2 October 2026. We did not read an LSEG release, and quarterly totals of this kind change as late-reported deals are added. The yields to 30 September are the Federal Reserve's published daily figures. The 1 October reading is Reuters'.