The Tug-of-War : Earnings vs. Yields. Q3 2026 Market Perspective from Mainline Capital
The quarter in brief
The S&P 500 gained 2.0% in the third quarter and finished September up 11.8% for the year (12.7% with dividends). That is a solid result, but it hides a real tug-of-war underneath.
On one side: corporate profits. S&P 500 earnings are on track to grow more than 29% this quarter, led by AI-driven technology and an oil-fueled energy sector. On the other side: interest rates. The Federal Reserve raised rates in September for the first time since 2023, and the 10-year Treasury yield climbed to about 5.3%, its highest close since 2007.
The result was a narrow market. Technology carried the indexes, while the Dow, small companies and most rate-sensitive sectors finished the quarter lower. Here is what happened, what we are watching, and what it means for your plan.
Q3 by the numbers
Technology-heavy indexes finished the quarter higher; nearly everything else finished lower.
September was the rough patch. The S&P 500 slipped 0.4% for the month and the Dow fell 4.3%, while the Nasdaq still gained 1.9%. The S&P 500 set its high for the year on August 13, when it was up 14.7% year-to-date, before rising yields cooled things off.
Market snapshot | Close, Sept 30, 2026 |
S&P 500 | 7,652 |
Dow Jones Industrials | 50,908 |
Nasdaq Composite | 26,861 |
Russell 2000 | 2,796 |
10-year Treasury yield | 5.29% |
Oil (WTI crude, per barrel) | $90.17 |
Gold (per ounce) | $4,211 |
VIX (volatility index) | about 16 |
What's tracking: earnings are doing the heavy lifting
Profits, not optimism, are holding this market up. According to FactSet, S&P 500 earnings are expected to grow 29.1% in Q3 on 12.1% revenue growth, the third straight quarter above 25%. Full-year 2026 earnings growth is now projected at 32%, with another 15.4% expected in 2027.
• Technology and AI. Tech was the only major sector to gain in September. Information Technology earnings are expected to grow 63.5% this quarter, and Communication Services 51.3%.
• Energy. Higher oil prices are expected to more than double energy-sector earnings (+111% year over year). Good for energy shareholders, harder on household budgets.
• Rate-sensitive sectors. Utilities, real estate, financials and consumer stocks lagged as yields rose. Small companies, which rely more on floating-rate borrowing, had the worst quarter of the major U.S. indexes.
Valuations are reasonable, not cheap. The S&P 500 trades at 19.2 times expected earnings over the next 12 months, slightly below its 5-year average (19.8) and close to its 10-year average (19.0). Strong earnings growth has kept the market from getting more expensive even as prices climbed.
One caution: the gains are concentrated. When a handful of sectors carry the index, diversification feels like it is "not working." That is usually when it matters most.
The economy: growing, but inflation is the problem
The U.S. economy is healthy; inflation is not. Growth and hiring held up in Q3, but energy prices kept headline inflation well above the Fed's 2% goal.
The key point: most of the inflation problem is oil. Strip out food and energy and prices are rising at the slowest pace in five years. That matters, because an oil shock tends to fade when the supply disruption ends, while broad-based inflation is much harder to dislodge.
Interest rates: the Fed hikes, and yields hit 5%+
On September 16, the Federal Reserve raised its benchmark rate by 0.25% to a range of 3.75% to 4.00%, its first increase since 2023. The vote was unanimous, 12 to 0. Chair Kevin Warsh was blunt: "Inflation is too high and has been for too long."
What the Fed signaled next:
• One more hike likely in 2026. The median projection puts the fed funds rate at 4.1% by year-end, implying one more 0.25% increase. 16 of 19 officials expect at least one more hike this year.
• A long road to 2%. The Fed does not expect inflation to return to its 2% target until 2029.
• October looks less likely. After the softer PCE report, futures markets priced only about a 35% chance of a hike at the October 27-28 meeting.
Bond markets moved further than the Fed. The 10-year Treasury yield rose from roughly 4.4% at the end of June to 5.29% on September 30. When yields rise, existing bond prices fall, so most traditional bond funds lost ground this quarter.
Borrowers felt it too. The average 30-year fixed mortgage rate reached 7.03% on September 24, up from 6.30% a year earlier, according to Freddie Mac.
The silver lining for savers: higher rates mean better yields on CDs, Treasuries and money markets, and generally more attractive terms on fixed and fixed-indexed annuities than at any time in years.
The global picture: an oil shock and a world of rising rates
The war with Iran, now more than seven months old, is the single biggest outside force on markets. The Strait of Hormuz, the route for a large share of the world's oil, remains largely closed. Brent crude traded near $96 a barrel in late September, briefly topping $100, versus about $72 before the conflict began in February. Indirect talks continue through Qatari mediators, but President Trump rejected Iran's latest ceasefire proposal in late September.
Central banks abroad are tightening too:
• Europe. The European Central Bank raised rates 0.25% in September, lifting its deposit rate to 2.50%. It expects eurozone inflation of 3.0% this year and growth of just 0.9%.
• Japan. The Bank of Japan raised rates to 1.25%, the highest since 1995. Japanese stocks fell about 4.7% in Q3.
• China. The economy is running at two speeds. Factory output grew 5.2% in August, but retail sales rose just 0.4% and investment is shrinking. Beijing announced a 360 billion yuan capital injection into state-owned banks to support lending; the Shanghai Composite fell about 6.2% in Q3, its worst quarter since 2022.
Politics and policy: midterms, tariffs and a December deadline
Washington adds noise, but so far not a new shock. Three items are on our radar:
• Midterm elections, November 3. Control of Congress is at stake. Historically, markets have tended to be choppy in the months before a midterm and to firm up once the uncertainty is resolved, regardless of which party wins. We do not recommend making portfolio changes based on election outcomes.
• Government funding. A shutdown was averted. Congress passed a stopgap bill (370-48 in the House) that funds the government through December 11, which sets up another deadline during the lame-duck session.
• Tariffs. After the Supreme Court struck down the emergency (IEEPA) tariffs in February, the administration used a temporary 10% global tariff, which expired July 24. It was replaced the same day by new Section 301 tariffs of 10% to 12.5% on about 60 trading partners. Unlike the temporary version, these have no expiration date. Court challenges over refunds of earlier tariffs are still working through the system.
The bigger policy story remains the Fed. With a new chair focused squarely on inflation, the central bank is willing to raise rates even in an election year.
Outlook: year-end and the next six months
Our base case is modest further gains, with more volatility than investors enjoyed in the first half. Earnings growth is strong enough to support stocks, but rising yields cap how much investors will pay for those earnings. Oil is the swing factor.
What we're watching:
• Q3 earnings season, starting mid-October: can tech and energy deliver the 29% growth expected?
• Fed meeting, October 27-28, and the year-end meeting in December
• Midterm elections, November 3
• Government funding deadline, December 11
• Iran talks and oil: the single biggest variable for inflation, rates and stocks
What this means for you
This is a market that rewards a plan more than a prediction. If you are retired or within ten years of retirement, four things are worth a conversation:
1. Lock in today's rates where it fits. Yields near multi-year highs make this a good time to review guaranteed income options, CDs, Treasuries, and fixed or fixed-indexed annuities for the portion of your money that needs to be safe.
2. Check your concentration. If tech has grown into an outsized share of your portfolio, rebalancing locks in some gains and reduces the risk of a single-sector pullback.
3. Keep your income bucket full. Having one to two years of planned withdrawals in stable assets means you never have to sell stocks during a dip.
4. Revisit your bond holdings. Longer-term bond funds have been hurt by rising yields. Shorter maturities or guaranteed alternatives may fit your needs better.
Volatility around oil, the Fed and the election is likely between now and year-end. None of it changes the fundamentals of a well-built retirement plan. If you would like to review yours, call our office or schedule a time with us.
Disclosures & Disclaimer
This blog post is intended for informational purposes and does not constitute individual investment advice. Past performance is not a guarantee of future results, and all investing involves risk. Please consult a qualified professional before making any investment decisions based on this information.
Matthew Hepburn
Mainline Capital Investment Associates
(215) 805-1716
