Costco Grew 10.6% and Got Sold Anyway. Micron Announced $250 Billion and Barely Moved.
Last week’s winners and losers made no sense until you looked at the fine print. This week, the banks and TSMC decide if any of it holds.
A company can grow double digits, raise its dividend, and still lose $18 billion in market cap before lunch.
Last week was another reminder that Wall Street doesn’t reward good companies—it rewards companies that beat impossible expectations. Sometimes the headline tells one story. The valuation tells another.
💥 Last Week’s Gainer: Micron (MU)
Micron reminded investors that the AI buildout isn’t slowing down—it might just be accelerating.
The company raised its U.S. manufacturing commitment to more than $250 billion through 2035, up from the original $170 billion announcement and June’s $200 billion update. On top of that, it committed another $3 billion alongside GlobalWafers in Texas, locking in a 10-year silicon wafer supply agreement.
The stock climbed 4.5% Thursday and held those gains into the weekend.
Here’s why investors cared.
Companies don’t announce quarter-trillion-dollar expansion plans because they’re hoping demand shows up. They announce them because somebody already signed the purchase orders.
Meta confirmed the same week that production of its custom AI chips begins in September. SK Hynix raised roughly $26.5 billion in one of the largest IPOs ever before surging 13% on its Nasdaq debut.
For two decades, memory chips were the quiet part of semiconductors.
Now they’re becoming one of the most important pieces of the AI stack.
Turns out RAM is finally having its main-character moment.
😬 Last Week’s Loser: Costco (COST)
Costco delivered what most retailers would call a dream month.
June net sales: $29.24 billion (+10.6%)
Comparable sales: +8.8%
E-commerce sales: +20.9%
The reward?
A 4.2% selloff Friday, leaving shares around $913—roughly 17% below their 52-week high.
Read those numbers again.
Double-digit growth.
Still punished.
Because Costco isn’t being valued like a retailer anymore.
At roughly 46x earnings, investors aren’t comparing Costco to Walmart or Target.
They’re comparing Costco to… Costco.
June’s 8.8% comparable sales represented a slowdown from May’s 12.5%, while analysts were expecting closer to 10.6%. Add in declining free cash flow and roughly $6.5 billion in warehouse expansion spending, and suddenly “great” wasn’t good enough.
JPMorgan even trimmed its price target.
The business remains elite.
The expectations became impossible.
When you’re priced for perfection, even excellence can feel disappointing.
🔮 This Week’s Predicted Gainer: Taiwan Semiconductor (TSM)
This week belongs to TSMC.
Every AI headline eventually runs through one company.
Micron’s expansion?
Meta’s custom chips?
AMD’s next-generation processors?
Eventually someone has to manufacture them.
Usually that someone is TSMC.
The Nasdaq climbed 1.74% last week almost entirely on semiconductor strength.
Nvidia added another 4% after export restrictions eased.
AMD rallied ahead of its upcoming Zen 6 launch.
Now investors finally get to see whether the AI spending spree is translating into actual foundry revenue.
If TSMC confirms demand is as strong as every customer keeps suggesting, the entire semiconductor trade could receive another leg higher.
Of course…
Tech is also running well above long-term trend levels.
Even a strong report could turn into a classic Wall Street sell-the-news event.
Sometimes earnings matter.
Sometimes positioning matters more.
🔻 This Week’s Predicted Loser: D.R. Horton (DHI) & The Homebuilders
While everyone watched AI headlines…
Housing quietly flashed another warning.
Existing home sales slipped to 4.09 million in June, below expectations.
Meanwhile, the 10-year Treasury yield climbed to 4.568%, marking eight gains in the past nine sessions and reaching its highest level since late May.
Mortgage rates followed higher.
Higher financing costs.
Slowing housing demand.
That’s rarely a combination builders enjoy.
The Russell 2000 lagged the broader market last week, and rate-sensitive sectors carried much of that weakness.
If Treasury yields stay above 4.5% through this week’s bank earnings, homebuilders could remain one of the market’s easiest places for investors to reduce risk.
Housing doesn’t need a recession to struggle.
Sometimes higher borrowing costs are enough.
🏦 The Calendar Anchor
This week isn’t about economic data.
It’s about confirmation.
Tuesday
🇺🇸 June CPI Inflation
JPMorgan Chase
Citigroup
Wells Fargo
Wednesday
🇺🇸 Producer Price Index (PPI)
Goldman Sachs
Morgan Stanley
Bank of America
Thursday
Taiwan Semiconductor (TSMC)
U.S. Retail Sales
Weekly Jobless Claims
Banks will tell us how consumers are holding up.
TSMC will tell us whether AI demand is translating into real dollars.
Together, they’ll likely set the tone for the rest of July.
📊 Final Thoughts
Last week proved something investors tend to forget.
Stocks don’t move on whether the news is good.
They move on whether the news is better than everyone already expected.
Costco reminded us that valuation still matters.
Micron reminded us that AI infrastructure spending isn’t slowing down.
Now it’s TSMC’s turn to decide whether the market’s biggest story still has another chapter—or whether expectations finally got ahead of reality.
Keep your watchlist fresh, your stops tight, and remember…
Wall Street loves growth.
It just loves surprises even more.
— The Bandicoots 📉📈