A borrower checks pricing at 9 a.m. and sees one set of numbers. By 2 p.m. the same day, the quote has shifted—sometimes better, sometimes worse—even though nothing changed in the application. That intraday swing is normal. Mortgage pricing is tied to real-time bond-market trading, and most lenders reprice their rate sheets whenever the underlying securities move enough to matter.
How intraday repricing works
Lock desks publish rate sheets that list the interest rate and corresponding cost (or credit) for each product. Those sheets are refreshed on a schedule—typically once in the morning and again in the afternoon, though volatile days can trigger three or four updates. The morning sheet reflects overnight bond activity and the opening session; the afternoon sheet incorporates midday trading. When you request a lock, the desk stamps it with the sheet in effect at that moment. A lock requested at 10 a.m. uses the morning price; the same loan locked at 3 p.m. uses the afternoon price, and the two can differ by an eighth of a point or more in rate or cost.
These figures are illustrative; rates and products are subject to change and this is not a commitment to lend.
What drives a reprice
Mortgage-backed securities trade continuously during market hours. Economic reports, Federal Reserve announcements, geopolitical headlines and Treasury auctions all move bond prices minute by minute. When the price of a mortgage bond rises, rates improve; when it falls, rates worsen. Lenders set tolerances—if the underlying index moves beyond a threshold, the pricing team publishes a new sheet. On calm days you may see only two updates; during volatile sessions, sheets can flip hourly. The trigger is market movement, not the clock.
Timing a lock when it matters
If you are watching conditions closely, ask your loan officer which pricing window is currently in effect and when the next update is expected. Some desks announce a cutoff—locks received by 11 a.m. Eastern use the morning sheet; locks after that wait for the afternoon release. There is no universal standard; each lender sets its own schedule. Alliance provides pricing as market conditions permit and cannot guarantee the direction or timing of intraday movement. Predicting the next hour's change is speculation, not science.
A few practical points: if the market opened sharply better overnight, the morning window often captures that improvement before it fades. If a major data release is scheduled for midmorning, many borrowers wait until after the dust settles to lock. Fridays and days before holidays sometimes see fewer updates because trading desks thin out. None of this is a rule—it is pattern recognition, not a promise.
The Alliance take
Intraday pricing reflects the live mortgage market, and the time you lock is part of the equation. If you want to manage that variable, stay in touch with your loan officer, ask about the current sheet and the next expected update, and understand that no one controls which way the next reprice will go. When you are ready to lock, the rate in effect at that moment is the rate you receive.