Market Sits -3.1% From Peak as S&P 500 Grades Shift
Major indexes enter Thursday, September 17 with SPY at $754.05 after narrow breadth, while overnight scoring runs re-evaluate prominent S&P 500 companies.
EasyAlpha Research · Sep 17, 2026 · Sep 17, 6:26 AM EDTPlus
The session at a glance
Index closes
as of Sep 17, 6:26 AM EDT
The U.S. stock market enters Thursday, September 17 with the broad index positioned -3.1% from its peak, following a session where selling pressure kept participation constrained across the board. The S&P 500 proxy fund SPY closed at $754.05, recording -0.4% on Wednesday, September 16. Market breadth was narrow throughout the day, with 34.1% of the largest US companies finishing higher. Major benchmark indexes showed varied performance, as the Dow closed -1.2%, the Russell 2000 small-cap tracker finished -0.4%, and the Nasdaq 100 ended 0.0%.
While New York was shut, EasyAlpha completed its daily scoring run across the S&P 500, resulting in revised assessments for several prominent companies. These updates represent shifts in our own analytical view of peer-relative company quality rather than events that happened to the companies themselves. On the downside, our evaluation lowered ON Semiconductor Corporation (ON) C to E on the sentiment around it, moved JB Hunt Transport Services Inc (JBHT) B to E on the sentiment around it, and shifted Comfort Systems USA Inc (FIX) A to D on the sentiment around it.
At the same time, our latest scoring run produced upward revisions for technology hardware and equipment names. EasyAlpha upgraded Lumentum Holdings Inc (LITE) E to C on its price behaviour, moved Coherent Inc (COHR) E to C on its price behaviour, and lifted Super Micro Computer Inc (SMCI) E to C on its price behaviour. These changes reflect direct adjustments in our evaluation of how each company trades against its industry peers over recent sessions, marking an improvement in our underlying assessment.
In around-the-clock trading, international benchmarks and commodity markets registered modest adjustments before the New York open. As of 10:30 am New York, precious metals showed gains with silver +1.6% and gold +0.7%, while foreign currencies softened against the greenback, showing the pound against the dollar -0.5% and the yen against the dollar -0.3%.
Looking ahead to the session opening on Thursday, September 17, corporate earnings activity remains quiet before picking up in the coming week. There are 2 covered companies scheduled to report during today's session: Hub Group Inc (HUBG, graded C), American Battery Technology Company Common Stock (ABAT, graded D). Over the next seven days, earnings reports will accelerate, with a total of 21 covered companies scheduled to release quarterly financial results.
Several individual companies stand out for notable corporate developments and unusual trading activity. Generac Holdings Inc (GNRC) enters the session after entering a strategic equity-linked supply deal with Amazon, issuing warrants for up to 1.69 million shares tied to up to $8 billion in generator payments for Amazon data centers. In the energy sector, ConocoPhillips (COP) experienced selling pressure as crude prices retreated due to eased Saudi supply concerns and a smaller-than-expected drawdown in domestic crude inventories. Meanwhile, Equity Residential (EQR) remains on watch after completing its merger to create Vivmark Residential.
Investors will also monitor whether the sharpest movers from Wednesday, September 16 carry their momentum into the opening bell. On the upside, optical component manufacturers saw substantial buying interest, led by Lumentum Holdings Inc (LITE) +9.6% and Coherent Inc (COHR) +6.9%. On the downside, freight and semiconductor names faced steep declines, with JB Hunt Transport Services Inc (JBHT) -13.3% dropping after management warned of higher diesel and driver costs, including roughly $25 million in driver-hiring expenses and at least $10 million in fuel costs, while ON Semiconductor Corporation (ON) -9.0% also retreated significantly.
This morning's lesson centers on why foreign exchange movements matter to investors who hold only domestic U.S. shares. When the U.S. dollar strengthens against major foreign currencies like the British pound or the Japanese yen, it creates an immediate translation headwind for American multinationals. Large corporations in the S&P 500 generate a substantial portion of their total revenue overseas. When those international sales are converted back into stronger dollars, reported top-line revenue and net income shrink on financial statements, even if local unit sales volumes remain steady. In addition, a stronger greenback makes American exports more expensive for overseas buyers, which can soften global demand for domestic industrial and technology products. Currency swings also ripple through dollar-denominated commodities like gold and crude oil, altering input costs for domestic producers. For everyday investors, monitoring currency benchmarks provides essential context for corporate earnings performance, even when their portfolios are strictly invested in domestic equities.
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Every day we grade each company against the other companies in its sector, looking at its finances, how its stock trades, and what the market is signaling. The result is one simple letter.
- AExcellent quality
- BGood quality
- CAverage quality
- DBelow average
- EWeakest quality
A grade measures quality against the other companies in a sector, from historical data. It is not a prediction, not a price target, and not advice. A company can be graded A and still fall.