Weekend Wrap: AMD Rips 13% as Chips Steal the Show

📊 Weekly Market Scoreboard

Week ending September 18, 2026

🏢 Sector Heatmap

🔎 The Week That Was

It was a tale of two markets this week. The Nasdaq climbed 1.28% to 26,522.54 on the back of a roaring chip trade, while the Dow slid 1.41% to 51,682.64 as investors rotated hard out of old-economy names. The S&P 500 split the difference, eking out a 0.40% gain to close at 7,650.50.

Under the hood, this was all about one sector. Technology jumped 2.89% and basically carried the entire tape by itself. Meanwhile, nearly everything else struggled — Communication Services got hammered 3.70%, Financials dropped 2.05%, and even defensive corners like Consumer Staples (-1.92%) and Utilities (-1.72%) couldn't find a bid.

That kind of narrow leadership is worth watching. When a single sector is doing all the heavy lifting and the broader market (see the Russell 2000, down 1.10%) is sagging, it tells you conviction is concentrated rather than broad-based. Semiconductors were the story, and the rest of the market took a back seat.

Heading into Monday, the question is whether the chip rally has legs or whether we see some profit-taking after a monster run. Keep an eye on whether money starts rotating back into the beaten-down sectors — a healthier rally would spread the love around rather than keeping it all in silicon.

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🟢 Top 5 Winners

🔴 Top 5 Losers

📈 What Drove the Moves

The winners board was a semiconductor clean sweep. AMD led the pack with a 13.46% surge to $559.82, followed by Intel (+11.74%), Marvell (+11.62%), and Micron, which climbed 9.93% to a jaw-dropping $1,015.80 per share. The AI infrastructure trade is clearly still very much alive, with investors piling into anything that stamps out chips — and Super Micro's 6.40% pop rounded out the group as the pick-and-shovel play.

The losers, on the other hand, were a grab bag of pain. Netflix cratered 10.62% to $71.79, the week's worst performer and a big reason Communication Services finished dead last among sectors. Salesforce dropped 8.13% as software took a backseat to hardware, and Roblox fell 6.77% amid the same growth-tech wobble.

Rounding out the red were two industrial and EV names: Boeing slid 5.74% to $198.20, and Rivian dropped 5.49% to $14.99. The message from the week was clear — if you weren't attached to the AI chip narrative, you were largely left behind.

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📅 Earnings: Week Ahead

🔭 What to Watch This Week

The calendar is quiet this week, but there's one name that matters: Costco reports Wednesday, September 24, with Wall Street looking for earnings of $6.48 per share. As one of the best barometers of the American consumer, Costco's numbers always get a close read.

The key thing to watch isn't just the headline EPS — it's membership renewal rates and traffic trends. Costco's model runs on those membership fees, and steady renewals signal that shoppers are still committed even when budgets get tight. Any commentary on inflation, spending shifts, or big-ticket versus staples purchases will offer a real-time pulse on consumer health.

Given how weak Consumer Staples were this week (down 1.92%), a strong Costco print could offer the sector a much-needed spark. Watch for how the stock trades in the aftermath — it often sets the tone for the retail group heading into the back half of the quarter.

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