CNA had two claims lines move almost exactly opposite ways in the latest quarter: $25 million of unfavorable development in other professional and management liability, and $26 million of favorable development in surety.

That roughly canceled out for the three months ended June 30. The six-month picture is less forgiving. Unfavorable development across other professional and management liability left CNA with $44 million of pretax adverse development, up from $10 million in the comparable period.

The headline numbers were higher. Second-quarter revenue rose 3.0% to $3.8 billion, while net income increased 7.4% to $321 million. Diluted EPS reached $1.18 from $1.10, and net margin moved up to 8.4% from 8.0%.

The tension is where that profit came from. Net investment income rose to $701 million from $662 million, a $39 million increase, while the underwriting record became more uneven. Investment income was higher in this comparison, while some insurance books are producing more expensive claims.

Management gave a specific explanation for the adverse line. The company said the problem was not one isolated accident year, but higher claim severity and frequency across multiple years.

"Unfavorable development in other professional liability and management liability was primarily due to higher than expected claim severity and frequency across multiple accident years." (CNA, Form 10-Q, Aug. 3, 2026)

In plain English, CNA had to increase its estimate of what older claims will cost. That is a reserve adjustment, not a new premium dollar, and it makes the six-month deterioration more important than the nearly flat three-month total.

Surety provided the counterweight. CNA attributed its favorable development there to lower-than-expected frequency and a lack of systemic activity across multiple accident years.

"Favorable development in surety was primarily due to lower than expected frequency and lack of systemic activity in multiple accident years." (CNA, Form 10-Q, Aug. 3, 2026)

So the filing offers two operating signals at once: professional liability claims are running hotter than CNA had estimated, while surety claims are running cooler. The company’s overall quarterly margin improved, but the underlying insurance result did not move in one direction.

The broader company history adds a useful constraint. CNA’s annual revenue was $1.6 billion in both 2024 and 2025, with the latest year down 2.0%. The latest quarter’s 3.0% revenue growth therefore arrives against a business that has recently been largely flat on the top line, not one that has been compounding rapidly.

Cash generation also deserves a separate reading. Capital spending fell 21.4% year over year, while free-cash-flow margin declined 2.3 percentage points. CNA’s supplied filing data do not identify a single cause for that change in this comparison.

At the latest close, CNA shares were $52.49, down 1.5% on July 31. Its trailing P/E was 11.2 times, alongside a filing that is also unresolved: investment income is rising, but reserve development is spreading across multiple professional-liability accident years. CNA’s next quarterly report will add the next comparison for those development tables.

The quarter’s trade-off is simple enough: the portfolio earned more while the claims estimates got less comfortable.

Source: CNA Form 10-Q for the period ended June 30, 2026.