The S&P 500 weekly close for the five days to 12 September 2026 showed another modest retreat, with the index, tracked via the SPY ETF, down 0.34% to 764.48.
The headline number masked a wider split beneath it: hardware names such as Hewlett Packard Enterprise and Skyworks Solutions posted double-digit gains, while Cooper Companies shed almost a quarter of its value in five sessions.
The scoreboard: a third quiet week at the top, sharper moves below
All three major benchmarks finished lower. The S&P 500 (SPY) fell 0.34% to 764.48. The Nasdaq 100, tracked through the QQQ ETF, moved almost in lockstep, down 0.35% to 714.89. The Dow, via the DIA ETF, underperformed both, off 0.62% to 525.91.
None of the three moves would register as dramatic in isolation. Taken together, they describe an index-level market that is going nowhere fast while individual stocks swing far harder in either direction – a pattern that has now persisted across consecutive weeks, as this outlet noted previously.
Winners: hardware has its week
Hewlett Packard Enterprise (NYSE: HPE) led the S&P 500 with a 21.01% weekly gain, closing at $62.10. Skyworks Solutions (NASDAQ: SWKS) was close behind, up 20.04% to $89.37.
HP Inc (NYSE: HPQ) added 10.56% to close at $35.45, and Dell Technologies (NYSE: DELL) rose 9.80% to $569.84. Dell’s advance came in the same week this site reported that the company’s AI server order book swelled to a $95bn backlog, a data point that puts hardware demand squarely in view for investors parsing the sector’s rally.
Coherent Corp (NYSE: COHR) rounded out the top five gainers, up 9.22% to $305.66. Across the group, the common thread is enterprise and AI-adjacent hardware – a corner of the market that moved sharply while the broader index barely stirred.
Losers: eyewear, fuel stops and data all fall hard
Cooper Companies (NYSE: COO) was the week’s heaviest faller, down 22.83% to $53.70. Casey’s General Stores (NASDAQ: CASY) dropped 19.35% to $612.01, and FactSet Research Systems (NYSE: FDS) fell 14.91% to $259.71.
Copart (NASDAQ: CPRT) declined 10.80% to $29.97, a move that followed this outlet’s report that the salvage auction operator’s fourth-quarter profit fell 17% despite rising revenue. Builders FirstSource (NASDAQ: BLDR) closed out the bottom five, off 10.62% to $59.00.
The spread between the week’s best and worst performers – a 21% gain against a near-23% loss – underlines how much dispersion sat beneath a benchmark that barely moved.
The macro shift: yields climb, oil follows
Treasury yields rose across the curve over the week. The 10-year yield climbed to 4.95% as of 10 September, from 4.83% previously, according to data from the Federal Reserve Bank of St. Louis. The 2-year yield rose to 4.56% from 4.43% over the same window.
The 10-year/2-year spread narrowed slightly to 0.33 percentage points from 0.39, as short-end yields rose faster than long-end ones. Crude also firmed: WTI spot settled at $97.26 a barrel on 9 September, up from $94.21 the prior reading.
Rising yields on both ends of the curve, alongside firmer oil, gave equity investors little in the way of a tailwind even as individual stocks moved sharply on their own news. A flattening spread alongside index-level calm is the kind of combination that tends to keep bond desks as busy as equity ones.
The number of the week
22.83% – the weekly decline in Cooper Companies shares, the sharpest move of any stock on this week’s board in either direction, against an S&P 500 that shifted barely a third of one percent. That gap, more than the index close itself, is the story this week’s tape told.
This article is for information only and is not investment advice or a recommendation to buy or sell any asset. Markets move quickly; figures are correct as sourced at the time of writing. Always do your own research before making financial decisions.
