U.S. stocks fell on Monday, September 28, 2026, as oil prices and Treasury yields rose, reviving concerns about inflation and the prospect of further Federal Reserve rate hikes. That session is the likely match for this headline—not the latest U.S. market close covered by the available reporting: on Friday, October 2, stocks rose and crude fell. A one-day market move has several influences, so the reported concerns are context, not proof that oil or yields alone caused the decline.
What happened on September 28
Reuters reported that U.S. stocks declined on Monday, September 28, with the Nasdaq leading the drop. The report linked the market’s weakness to rising Treasury yields and oil, which were feeding inflation concerns and expectations of more Federal Reserve tightening. It also pointed to uncertainty around U.S.-Iran negotiations and risks to supply routes as factors behind oil’s advance. These were explanations circulating at the time, not a measured breakdown of what caused the session’s losses. Reuters’ September 28 market report gave the following closing figures:
- U.S. crude settled at $92.60 a barrel; Brent settled at $105.28 a barrel.
- The 10-year Treasury yield was 5.251%, up from 5.181% late Friday.
- The 2-year Treasury yield was 4.937%, up from 4.864% late Friday.
Reuters also cited a roughly 70% market-implied chance of another Fed rate increase in October, based on CME FedWatch at that time. That was a snapshot of market expectations—not a Fed decision or a probability that should be treated as current.
Why rising Treasury yields can weigh on stocks
Bonds become more competitive
When market yields rise, investors can get a higher return from newly available bonds, which may make stocks less attractive at the margin. Higher yields can also increase borrowing costs across the economy, although the effect depends on the borrower, the type of debt and how quickly financing needs to be met.
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Future earnings are valued less highly
Investors estimate what a company’s future cash flows are worth today. A higher discount rate reduces the present value of cash expected further in the future, all else equal. That can put more pressure on companies whose valuations depend heavily on anticipated long-term growth. It is a valuation mechanism, not a rule that every stock must fall when yields rise.
The quoted Treasury yield also needs a little context. The U.S. Treasury says its official par yield curve is derived from indicative quotations for recently auctioned securities, obtained by the Federal Reserve Bank of New York at or near 3:30 p.m. each business day. A 10-year par yield is a curve-derived constant-maturity measure; it is not a record of trades in one bond with exactly 10 years left, nor a guaranteed return. See the Treasury’s explanation of daily par yield curve rates.
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Why rising oil can matter to the market
More expensive oil can raise costs for transportation, manufacturing and household energy. If a price rise is large or persistent and investors see it as supply-driven, they may also worry that inflation will stay elevated. Those concerns can affect expectations for interest rates and, in turn, bond yields. Reuters connected oil’s September 28 rise with inflation concerns and supply risks.
The impact is not uniform. Energy producers may benefit from higher selling prices, while fuel-intensive businesses and consumers may face higher costs. How the overall market responds depends on the size and persistence of the move, company exposure, demand, policy expectations and what investors had already priced in. The available reporting does not quantify how much oil contributed to that day’s stock decline compared with yields or other influences.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.September 28 was not the latest market direction
The latest U.S. session in the reporting available for this article was Friday, October 2, 2026, and its direction differed from September 28. The Associated Press reported that the S&P 500 rose 0.7%, the Dow gained 0.5% and the Nasdaq rose 1.2% that day. Reuters reported that U.S. payrolls increased by 29,000 in September, compared with the 90,000 increase economists polled by Reuters had forecast. The weaker-than-expected jobs figure helped reduce near-term rate-hike bets; oil fell, while the 10-year yield had retreated from its September 30 high before moving back up after the jobs data. These figures describe October 2, not the September 28 decline. See the Associated Press October 2 market recap and Reuters’ October 2 jobs and markets coverage.
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How to read a headline like this
- Check the session date. Market headlines can describe a particular day’s move rather than the direction of the most recent close.
- Separate data from interpretation. Prices and yields are reported market figures; claims about inflation fears or rate expectations explain how investors may have interpreted them.
- Look at more than one driver. Oil, yields, economic releases and policy expectations can move together, and a same-day correlation does not identify a single cause.
- Treat probabilities as snapshots. A market-implied rate-change estimate can shift quickly and is not a Federal Reserve commitment.
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