Rising mortgage rates are driving a strategic shift in borrower behavior, as adjustable-rate mortgages (ARMs) capture their largest share of rate locks in nearly four years. According to the October 2026 ICE Mortgage Monitor report, ARMs accounted for more than 11% of rate locks following the ICE Conforming 30-year Fixed Rate Index reaching 7.2% on Sept. 24. While this indicates a growing appetite for flexible rate structures to avoid high fixed costs, the broader market exposure to adjustable payments remains constrained. Intercontinental Exchange, Inc. (NYSE: ICE) notes that while active first-lien ARMs have hit a 5.5-year high of 3.1 million, these loans represent only 5.6% of all active mortgages, suggesting that the immediate systemic impact of rate volatility on ARM holders may be more localized than the recent demand surge implies.
ARM Demand Spikes as Fixed Rates Climb
The recent uptick in ARM interest highlights a tactical move by borrowers seeking relief from elevated fixed-rate environments. As the ICE Conforming 30-year Fixed Rate Index hit 7.2% in late September, the share of rate locks attributed to ARMs climbed above 11%, a level not seen in nearly four years. However, ICE Mortgage and Housing Market Research head Andy Walden cautions that overall market exposure to adjustable payments remains limited. Although there are currently 3.1 million active first-lien ARMs—the highest volume in 5.5 years—they constitute only 5.6% of the active mortgage market.
A critical distinction exists between total ARM volume and those actually facing rate resets. Currently, only about one-third of active ARMs have begun adjusting. The report reveals that the number of ARMs currently adjusting is at its lowest level in more than 25 years, with just 1.05 million active ARM loans having reached their first reset. This is largely because more than 90% of ARMs originated since 2022 are still within their introductory fixed-rate periods. Consequently, while the demand for new ARM products is accelerating, the immediate pressure on the servicing market from resetting loans remains historically suppressed, as most recent originations are still shielded by their initial terms.
Divergent Impacts of Rate Adjustments and HELOCs
The financial impact of rate changes is not uniform across the mortgage landscape, as the timing of loan origination dictates borrower vulnerability. For existing ARM borrowers, the impact of recent Federal Reserve activity is expected to be gradual. ICE estimates that a 25-basis-point pass-through to underlying indexes would result in a median monthly payment increase of approximately $14 for the typical borrower. However, more recently originated loans, which often carry higher balances, could see a more significant median increase of roughly $53 per month.
The most acute volatility is expected among specific cohorts, such as 7-year ARMs originated in 2020. These borrowers are projected to face the largest median payment increases, estimated at approximately $1,066 per month, or a 36% jump, due to lower initial rates and higher periodic rate caps. In contrast, home equity borrowers face more immediate exposure. ICE’s McDash Home Equity data shows that second-lien HELOCs, which typically reset monthly based on the prime rate, have a median outstanding balance of $44,000 and a median rate of 7.4%. For these borrowers, a 25-basis-point increase translates to a roughly $9 increase in the median monthly payment, reflecting the high sensitivity of home equity products to short-term rate fluctuations.
Key Takeaways
- ARM rate locks reached over 11% of the market, the highest share in nearly four years, as fixed rates rose.
- Only 1.05 million active ARM loans have reached their first reset, marking a 25-year low in currently adjusting loans.
- 7-year ARMs originated in 2020 are expected to see the largest median payment increases, estimated at $1,066 per month.
FinanceInsyte's Take
In our view, the surge in ARM demand is a clear signal of borrower exhaustion with the current fixed-rate environment, yet it creates a bifurcated risk profile for the mortgage market. While the headline demand for ARMs suggests a pivot in consumer preference, the actual "reset risk" is currently decoupled from this new demand because the vast majority of recent ARMs are still in introductory periods. This creates a delayed volatility profile. Lenders and servicers should not mistake the current low number of adjusting loans for a lack of systemic risk; rather, they are looking at a "coiled spring" effect where the most significant payment shocks—specifically for 2020-era 7-year ARMs—are concentrated in specific, high-impact cohorts. For institutional players, the focus must shift from broad market volume to the granular tracking of these specific reset windows to manage credit and servicing exposure effectively.
Questions & Answers
How does the current ARM market differ from historical reset cycles?
Unlike previous cycles, the number of ARMs currently adjusting is at a 25-year low. This is because over 90% of ARMs originated since 2022 are still in their introductory fixed-rate periods, meaning the recent surge in ARM demand has not yet translated into widespread payment adjustments.
What is the projected financial impact of a 25-basis-point rate increase on different borrower groups?
The impact varies significantly by loan structure: the median ARM borrower may see a $14 monthly increase, while more recent, higher-balance ARM loans could see a $53 increase. HELOC borrowers face a more immediate, though smaller, median increase of roughly $9.
Which specific borrower segment faces the highest risk of payment shock?
Borrowers holding 7-year ARMs originated in 2020 face the most significant risk. They are expected to see a median monthly payment increase of approximately $1,066, representing a 36% increase, driven by lower initial rates and higher periodic rate caps.
What trend is emerging regarding how borrowers manage interest rate costs?
Borrowers are increasingly opting to pay more upfront to secure lower rates. The share of borrowers paying points to buy down interest rates reached 50% in August, marking the highest level since early 2025.
Source: ICE Mortgage Monitor
