SP500 (SPY) on Solana

Trivariate Research founder Adam Parker warned that multiples for AI-related names "are likely to continue to decline, and maybe have permanently peaked," citing the interest rate cycle and shifts in AI policy direction as key pressures. The note comes after the Federal Reserve raised its overnight rate to a 3.75%–4% range — its first hike in more than three years — adding further compression risk to growth-oriented valuations that dominate S&P 500 index weight.

Despite the multiple-contraction outlook, Trivariate maintained that it "continues to want exposure to this group," arguing that revenue growth from select AI names can more than offset shrinking price-to-earnings ratios. For SPY holders, the framing matters: AI-heavy components account for a disproportionate share of S&P 500 index weight, meaning a sustained valuation reset in that cohort could weigh on the broader index even as underlying business fundamentals improve.

A convergence of trade tariffs, elevated fuel prices, and tighter monetary policy is compressing margins across S&P 500 sectors, with manufacturers, logistics firms, and retailers among the hardest hit. The Federal Reserve raised its benchmark rate 25 basis points in September to a 3.75%–4.00% range — its first hike since 2023 — adding financing cost pressure on top of already elevated input costs. U.S. airline fares climbed more than 23% year-over-year in August, and industrial companies report sharp raw-material inflation: one Iowa manufacturer saw a single aluminum component double in price over the summer, from $42 to $87. Auto-parts supplier Lucerne International canceled a planned $50 million U.S. forging facility and shut domestic manufacturing operations, while Grupo Antolin filed Chapter 15 bankruptcy in July, citing tariffs, energy costs, and supply-chain disruptions.

The simultaneous cost shocks are translating into broader earnings risk for the index. Eastman Chemical CEO Mark Costa has said the industry has "no room to absorb these increases," with companies raising prices at a pace he called unprecedented in his 20-year career. Home Depot's CFO has flagged ongoing uncertainty around energy, raw materials, and interest rates. With cost relief not clearly in sight on any of the three fronts, consensus earnings estimates for SPY constituents face continued downside pressure through year-end.

The S&P 500 closed 0.1% lower for the week ending September 19, 2026, its second consecutive weekly decline, while the Dow Jones Industrial Average shed 1.7% over the same period. Rising global bond yields — with the 10-year Treasury touching its highest level in 19 years — combined with a Federal Reserve rate hike of 25 basis points amplified selling pressure across equities.

The back-to-back losing weeks pushed several individual stocks into oversold territory. Boeing fell more than 5% to an RSI of 25 after its CEO flagged a longer-than-expected timeline for 737 Max stabilization, while Bank of America dropped roughly 8% (RSI 28) after its CEO warned of a 10%-plus decline in Q3 investment banking fees. Wynn Resorts was the most oversold component with an RSI of 17, hitting a 52-week low near $81 and down approximately 31% year-to-date in 2026. Las Vegas Sands, Carrier Global, and TransDigm also registered oversold readings. On the other end, energy stocks benefited from Saudi Arabia's pipeline closure following a drone attack: Marathon Petroleum surged more than 7% to a record $428 (RSI 87, up 161% year-to-date), with Valero Energy and Phillips 66 also registering overbought readings.

South Korea's KOSPI has surged 55% in 2026, sharply outpacing the S&P 500 (SPY +12%) and Nasdaq-100 (QQQ +16.6%), driven by the country's dominance in high-bandwidth memory (HBM) chips for AI data centers. SK Hynix gained 154% and Samsung Electronics 95% over the same period, propelling the South Korea ETF (EWY) up 94% year-to-date. The performance gap has drawn renewed attention to SPY as a benchmark, with investors comparing relative returns across major global indices.

To capture growing investor interest, the Korea Exchange (KRX) launched four-hour after-market trading sessions on September 14, 2026 — running from 4 p.m. to 8 p.m. local time — with ETFs and ETNs excluded due to volatility concerns. Pre-market sessions are planned before the end of 2027. "The longer trading window generally means more flexibility for investors, and that makes the market more efficient," said Young Jae Lee, senior investment manager at Pictet. The KOSPI's rally has not been without turbulence; the index surged to 9,000 points earlier in 2026 before retreating to the 5,500–6,000 range, triggering circuit breakers and retail investor losses.

Scott Rubner, head of equity and derivatives strategy at Citadel Securities, issued a note at the close of August warning that the near-term risk-reward setup for US equities is weakening as the calendar flips to September. Rubner cited September's historical record as the worst month of the year for the S&P 500 by average return, and pointed to a structural retreat in retail investor demand: since 2019, net purchases by retail investors on S&P 500 down days in September have run at roughly half the rate seen in other months, reducing a key stabilizing bid that has supported dips elsewhere in the year.

On the supply side, Rubner flagged that corporate share buyback activity—another significant source of equity demand—is set to slow materially as earnings-related blackout periods intensify around September 12. He also noted that investors are heading into a macro-event-heavy stretch while paying a historically low premium for downside protection, meaning the cost of being wrong is rising relative to potential upside. Citadel did not change its constructive long-term view on equities; the warning was framed as a near-term positioning caution tied specifically to seasonal, flow, and valuation dynamics rather than a shift in its cyclical outlook.

SPYM, the cheaper S&P 500 ETF launched to challenge SPY's long-standing dominance, has attracted $56.75 billion in year-to-date inflows in 2026, bringing its assets under management to $170.5 billion — still well short of SPY's roughly $808.5 billion but a clear sign of accelerating investor migration toward lower-cost vehicles. The fee gap is stark: SPYM charges 0.02% annually versus SPY's 0.0945%, a difference worth $74.50 per year on every $100,000 invested. Both funds hold identical S&P 500 exposure with NVIDIA as the top position at an 8% allocation.

The structural edge beyond fees matters too. SPYM's open-end fund design allows immediate dividend reinvestment and securities lending, which improves tracking efficiency over time. SPY, launched in 1993 as a unit investment trust, retains a decisive advantage in liquidity and options market depth, making it the preferred instrument for traders running hedges or moving large positions quickly. For passive, long-horizon exposure to the S&P 500, the cost and efficiency argument continues to shift toward SPYM and comparable low-fee alternatives like Vanguard's VOO and iShares' IVV.