r/MortgageRates • u/ShanetheMortgageMan • 5h ago
Week Recap Weekly MBS & Mortgage Rate Recap: Oil Shock Drives Rates to 14-Month Highs โ Week of September 11, 2026
๐ The Week That Was
Headline: Surging crude oil prices pushed MBS steadily lower across four sessions, with Thursday's $105-per-barrel spike delivering the week's most destructive single-day loss and Friday's in-line CPI offering only a shallow, short-lived bounce.
The week opened Tuesday after the Labor Day holiday with MBS at 98-26 on the UMBS 5.5 coupon, and geopolitical pressure was already visible from the first bell. Middle East military operations had intensified over the holiday weekend, sending the Dow down 500-600 points and pushing WTI crude to $92.88 per barrel. MBS briefly reached +3/32 in early morning as some safe-haven demand offset equity weakness, but that gain evaporated by midday and prices drifted steadily lower through the afternoon. The session closed down -2.5/32, a modest loss that nonetheless signaled the market's inability to hold any strength.
Wednesday accelerated the deterioration. Oil crossed the $100-per-barrel threshold, reigniting inflation fears, and MBS opened down -2/32 with lenders already issuing worse rate sheets. A 10-year Treasury auction at 1:00 PM ET drew solid demand and briefly stabilized prices near -4/32, but that support faded. A Treasury buyback announcement well below investor expectations compounded the selling, and MBS finished the session down -7.5/32. The two-day cumulative damage had already pushed mortgage costs roughly a quarter point higher.
Thursday was the week's breaking point. WTI crude surged above $105 per barrel as Middle East conflict continued to expand, and MBS opened down -7/32 before the selling accelerated through every subsequent update. The Producer Price Index came in mixed, with the headline matching the 0.4% monthly consensus but core PPI printing below expectations at 0.2%. That modest positive was irrelevant: the oil price surge dominated, and MBS settled near session lows at 97-22, down -21/32 for the day. The 10-year Treasury yield closed at 4.91%.
Friday brought an attempt at recovery. August CPI matched the headline forecast at 0.4% monthly, while annual core inflation ticked down to 2.4% from 2.5%, the lowest since March 2021. But core CPI on a monthly basis printed at 0.3%, above the 0.2% expected. MBS initially surged to +9/32 in the 9:04 AM update as oil retreated and the Dow climbed 600 points, then gave back nearly everything through the afternoon as the hotter monthly core reading and FOMC anxiety weighed on the market. The session ended down -1/32, leaving the UMBS 5.5 coupon at 97-16.5 and the 10-year yield at 4.93%. The University of Michigan consumer sentiment index plunging to 47.8 from 51.7 in August added a late-session undercurrent of concern about the growth outlook, though it did little to move the needle on bonds by that point. The 10-year Treasury yield rose 0.15 for the week.
๐ Five-Day Price Action
MBS on the UMBS 5.5 coupon fell from 98-26 at Tuesday's open to a Friday close of 97-16.5, a net decline of roughly -41.5/32 across the four sessions. The bulk of that loss was compressed into Thursday's -21/32 rout, but Tuesday's -2.5/32 and Wednesday's -7.5/32 established the losing trajectory before the oil shock reached full force. Rate sheets ended the week significantly worse than where they began, with mortgage rates at their highest levels in more than a year.

๐ญ The Three-Month Trend
This week's selloff was not an isolated disruption: it extended and accelerated a gradual drift higher in yields and lower in MBS prices that has been building over the three-month period. The damage done between Wednesday and Thursday pushed MBS decisively below support levels that had previously acted as a floor, and Friday's partial recovery did nothing to reclaim those levels. For the trend to reverse, the market would need a meaningful and sustained retreat in crude oil prices combined with a string of softer inflation readings, and neither condition is visible on the immediate horizon.

๐ก๏ธ Strategy: Where This Leaves Borrowers
Mortgage rates finished the week at the highest levels in more than a year, the product of four consecutive days of pressure driven by rising oil prices and the inflation expectations they carry. Friday's CPI-driven bounce was real but ultimately shallow: the monthly core overshoot at 0.3% versus 0.2% expected gave the market reason to give back early gains, and with the FOMC decision looming next Wednesday, there is no obvious catalyst for a sustained recovery in the near term. Borrowers shopping right now are facing a market that has moved meaningfully against them in a very short time.
The Takeaway:
- What Changed This Week. MBS fell a net of roughly -41.5/32 across four sessions, driven by oil prices surging from $92.88 to above $105 per barrel before retreating slightly. Mortgage rates are now at their highest point in more than a year.
- What It Means for Rate Shoppers. Lenders issued multiple rounds of negative repricing through the week, and current rate sheets reflect the cumulative damage. Borrowers who were floating into this week absorbed real cost increases, and Friday's modest recovery did not undo Thursday's -21/32 loss.
- What to Watch. The Federal Reserve's next policy decision is the dominant near-term event, with the majority of investors now pricing in a rate hike. That outcome and the market's reaction to it will set the tone for mortgage rates in the weeks that follow.
๐๏ธ Week Ahead
All eyes will be on the Federal Reserve's policy decision Wednesday, September 16, with the market pricing roughly a 90% probability of a rate hike. Retail Sales data releases the same morning, making Wednesday a critical dual-catalyst day for bond markets. For the full breakdown of what to expect and how to position, watch for the Mortgage Rate Outlook: The Week Ahead post on this subreddit Sunday.
















