Arch Capital’s diluted share count fell 8.2% in the three months ended June 30. That is the oddest number in a filing where revenue fell 10.5%, net income fell 14.6%, and diluted EPS fell a smaller 7.1%. The arithmetic is doing some of the talking: fewer shares softened the decline on a per-share basis.
The business itself was smaller. Revenue fell to $4.7 billion from $5.2 billion a year earlier, while net margin slipped to 22.6% from 23.7%. At the latest close, Arch was valued at 8.5 times earnings during a period in which the top line was moving backward.
Management tied the revenue decline to the insurance market, not to a single accounting item. Net premiums written fell roughly 10%, with pricing pressure, higher retentions by cedants in certain property and short-tail lines, and targeted increases in retrocessions all named as factors.
Arch’s own explanation was specific:
"Net premiums written were $1.8 billion, down roughly 10% when compared to the 2025 second quarter, reflecting pricing pressures and higher retentions by cedants in certain property and short‑tail lines along with targeted increased retrocessions."
Arch Capital Group, 10-Q filed 2026-08-04
In plain English, some of the premium volume that had reached Arch a year earlier did not reach it this time. The company does not quantify how much of the decline came from each factor.
The margin comparison also has a prior-year wrinkle. Arch said the MCE Acquisition had lowered the underwriting expense ratio in the 2025 second quarter by about 0.6 points because of fair-value accounting for acquired assets, including the non-recognition of deferred acquisition costs.
"In the 2025 second quarter, the impact of the MCE Acquisition lowered the underwriting expense ratio by approximately 0.6 points, primarily due to the effects of the fair value estimation of the assets acquired at closing, including the non-recognition of deferred acquisition costs."
Arch Capital Group, 10-Q filed 2026-08-04
That means the year-over-year margin comparison is not a clean look at underlying operating change. Still, the reported margin narrowed, and the filing gives two separate pieces of the explanation: weaker premium volume and an unusually favorable comparison in the prior year.
Capital allocation makes the picture less tidy, though not necessarily more complicated. Arch disclosed that book value per share rose 2.8%, helped by underwriting and investment returns, while $1.2 billion of shares were purchased at an average price above book value per share. Cash rose 12.8% to $1.1 billion, so the buyback did not coincide with a lower reported cash balance.
The broader annual record supplies a useful backdrop without settling the current issue. Revenue reached $19.9 billion in 2025, up 14.3% from the prior year, while annual net margin fell 2.7 percentage points. Arch has been growing across the full year, but the latest three months bring the question back to pricing and retention conditions.
The unresolved point is not whether Arch repurchased shares. It is whether the premium pressure described in this 10-Q is still present in the company’s next quarterly report, and whether net premiums written are still being reduced by pricing, higher retentions, or retrocessions.
Will Arch’s next quarterly report show net premiums written still under pressure from pricing and higher retentions?