Fannie Mae released its August 2025 monthly summary on Monday, providing fresh detail on the government-sponsored enterprise's mortgage holdings, guarantees and performance metrics as the housing market adjusts to higher interest rates.

The report shows Fannie Mae's gross mortgage portfolio stood at roughly $3.1 trillion at the end of August, while mortgage-backed securities and other guarantees accounted for about $5.4 trillion in outstanding exposure. Year-to-date purchases and guaranties of single-family loans were approximately $420 billion, the summary said, underscoring the company's continuing role as a primary liquidity source for the U.S. mortgage market.

One of the more closely watched indicators — the serious delinquency rate, defined as loans 90 days or more past due or in foreclosure — rose modestly to 1.2 percent in August from 1.1 percent in July and 1.0 percent a year earlier. Fannie Mae noted the increase was concentrated in certain geographic pockets and lower-balance cohorts, reflecting localized economic stress rather than a broad-based deterioration. The report also highlighted a decline in cure rates for late-stage delinquencies, a metric that analysts view as an early warning of potential losses.

"The monthly summary report contains information about Fannie Mae's monthly and year‑to‑date activities," the company said in the release distributed through its newsroom, pointing readers to more detailed schedule files and interest-rate risk measures on its website.

Interest-rate risk metrics included in the packet suggested hedging activity and prepayment behavior had tempered the immediate sensitivity of the portfolio to further rate moves. Fannie Mae's stated duration profile for its retained securities and servicing flows remained relatively short, a structural feature that has helped limit mark-to-market volatility in the face of elevated Treasury yields. Mortgage rates have averaged above 6 percent for much of 2025, pressuring refinance volumes and slowing originations compared with the surge seen during the pandemic.

Market participants said the data will factor into the pricing of agency MBS and the risk assessments of investors that treat Fannie- and Freddie-backed securities as benchmark safe assets. "Modest increases in delinquencies don't change the core credit profile for agency MBS, but they do reinforce why investors need to watch regional labor markets and housing affordability," said Elena Morales, a mortgage strategist at a New York asset manager.

Beyond markets, the summary feeds into an ongoing policy discussion. The Federal Housing Finance Agency, which conserves and supervises Fannie Mae, continues to face pressure from lawmakers and housing advocates over how best to balance market stability with reforms intended to reduce taxpayer exposure. A small but persistent rise in delinquencies bolsters arguments for more robust capital buffers and clearer plans for a post-conservatorship framework.

For now, Fannie Mae's size and centralized role mean that even modest shifts in its portfolio performance can ripple through mortgage pricing, bank balance sheets and the broader housing finance system. The August summary offers officials and investors new data to calibrate those risks as the economy navigates a higher-rate era.