Stocks Retreat as Elevated Treasury Yields and U.S.-Iran Uncertainty Overshadow Oil Reversal

The major averages finished broadly lower on Monday after a volatile session dominated by sharp swings in crude oil, elevated Treasury yields, and rapidly changing headlines surrounding U.S.-Iran negotiations. The S&P 500 declined 0.8%, the Nasdaq Composite fell 0.9%, and the Dow Jones Industrial Average lost 0.7%. All three finished near their late-session lows, although they remained above the worst levels reached during the morning.

Oil and interest rates provided the primary macro headwinds early in the session. WTI crude surged more than 3% to above $95 per barrel during the morning as uncertainty surrounding negotiations between the United States and Iran intensified. At the same time, the 10-year Treasury yield climbed as high as 5.26%, reinforcing concerns about elevated borrowing costs and equity valuations.

The combination of rising oil prices and higher Treasury yields triggered broad selling, briefly pushing losses in the major averages toward or beyond 1%. Higher crude prices threatened to add to inflationary pressures, while the renewed backup in long-term yields created an especially challenging environment for growth stocks and other rate-sensitive areas of the market.

The tone improved considerably around midday as a series of reports suggested that diplomatic channels remained open despite substantial differences between Washington and Tehran. Reports pointed to potential discussions involving sanctions relief and Iran’s nuclear program, while other developments suggested negotiations between the two sides could continue during the week.

Those headlines triggered a sharp reversal in crude oil, removing one of the market’s largest early headwinds and helping the major averages recover a substantial portion of their morning losses. Uncertainty surrounding the negotiations nevertheless remained elevated, preventing the improvement in sentiment from developing into a sustained equity rebound.

Later reports suggested that Iranian officials remained pessimistic about the prospects for reaching a near-term agreement that would end the conflict and fully reopen the Strait of Hormuz. WTI ultimately settled just $0.27 higher, or 0.3%, at $92.44 per barrel—a dramatic reversal from its morning surge above $95.

Despite the retreat in oil, selling remained relatively broad into the closing bell. Cyclical and growth-oriented sectors accounted for much of the weakness, with communication services (-1.7%), consumer discretionary (-1.6%), financials (-1.1%), and industrials (-1.0%) among the session’s largest laggards.

Mega-cap growth stocks also remained under pressure, sending the Vanguard Mega Cap Growth ETF down 0.9%. Meta Platforms (META 715.62, -36.04, -4.79%) was a particularly significant drag, falling nearly 5% as the stock continued to pull back following its double-digit advance the previous week.

Semiconductors provided another source of weakness. The PHLX Semiconductor Index declined 1.6%, giving back some of the group’s recent gains and contributing to the broader pressure on technology shares.

NVIDIA (NVDA 228.86, +3.79, +1.68%) was a notable exception. Shares advanced after the company increased its share-repurchase authorization by $150 billion to $235 billion and launched its Open Agent Safety Platform. NVIDIA’s strength helped information technology (-0.7%) hold up better than several other growth-oriented sectors despite weakness across the broader semiconductor group.

Defensive areas offered relative support. Consumer staples (+0.4%) and health care (+0.3%) were the only sectors to post meaningful gains, while energy (+0.2%) narrowly finished higher after surrendering most of its early advance as crude oil reversed from its morning highs.

Weakness was not confined to the largest companies. The Russell 2000 and S&P MidCap 400 both declined 0.7%, underscoring the broad nature of the session’s selling pressure.

Several company-specific developments also produced pronounced moves. MongoDB (MDB 334.68, -75.76, -18.46%) plunged more than 18% after President and CEO Chirantan “CJ” Desai stepped down effective immediately to accept a senior position at Meta Platforms.

The departure marks MongoDB’s second CEO transition in less than a year and comes just ahead of the company’s September 29 Investor Day. Former CEO Dev Ittycheria was named interim president and CEO while the company begins an external search for a permanent replacement. MongoDB nevertheless reaffirmed its fiscal third-quarter and FY27 guidance.

NIKE (NKE 36.37, +0.62, +1.73%) moved firmly against the broader market trend, displaying notable relative strength ahead of its fiscal first-quarter report on Thursday afternoon. The gain offered some relief during what has been a difficult year for the stock, which remains down roughly 43% year to date.

Investors continue to assess the progress of NIKE’s turnaround amid weakness in Greater China, elevated discounting, competitive pressures, and questions surrounding the company’s product pipeline and direct-to-consumer strategy. Thursday’s results will therefore provide an important update on whether recent initiatives are beginning to stabilize the business.

Monday’s session ultimately demonstrated how sensitive the equity market remains to the combination of oil prices, Treasury yields, and geopolitical developments. The dramatic reversal in crude removed one of the morning’s most significant headwinds and allowed stocks to recover substantially from their worst levels, but it was not enough to produce a sustained rebound.

Elevated Treasury yields remained a persistent source of pressure, while continued weakness across cyclical stocks, mega-cap growth names, and semiconductors ultimately pulled the major averages back toward their lows into the close. With the 10-year Treasury yield reaching 5.26% intraday and uncertainty surrounding U.S.-Iran negotiations still elevated, interest rates and energy prices remain critical variables for the market heading into the remainder of the week.

Our FTinvest 11 model portfolio declined 0.64% to close at 896.09, extending its losing streak to a third consecutive session and falling below the 900 level. The latest decline establishes another new low for the current correction, with the portfolio now approximately 18.3% below its all-time closing high of 1,096.33 and firmly in correction territory.

FTinvest 11 is now down approximately 3.46% year-to-date, extending its move into negative territory after surrendering its earlier 2026 gains. Monday’s decline follows the sharp losses recorded late last week and indicates that selling pressure has continued into the new week. With FTInvest 11 now below both its start-of-year level and the 900 milestone, the portfolio remains in a substantial drawdown from its July record.