Cisco Set a Revenue Record and Fell 9%: Memory Costs Are Why

One Story, Priced in Two Directions

On Thursday, August 13, two groups of stocks in New York moved in opposite directions for the same reason: the price of memory.

That morning SanDisk targeted an adjusted gross margin near 80% for fiscal 2028 through 2030 and rose 15.3%; SK Hynix gained 7.8%, Micron 5.1%. In the same session Cisco fell 9.3%.

The night before, Cisco reported its largest quarterly revenue ever: $17.3 billion, up 18%, with adjusted earnings of $1.22 a share, up 23%. AI infrastructure orders hit $4 billion in the quarter and $9.3 billion for the year — 4.5 times the prior year — and guidance of $72.2–$73.4 billion beat consensus.

Five brokerages raised their targets. The stock still shed about $41 billion in a day, and the link sits in one line: adjusted gross margin fell from 68.4% to 66.3%. Those 2.1 points went into the revenue line of the stocks that rose 15% the same day.

Inside the Record: Rising Revenue, Falling Percentage

Cisco's fiscal 2026 ended July 25. Fourth-quarter product revenue rose 24% to $13.5 billion, services was flat at $3.8 billion, and full-year revenue reached $63.3 billion, up 12%.

As the box count climbed the mix tilted toward hardware. CFO Mark Patterson: "We are in a networking super cycle and shipping high volumes of hardware, which increases the revenue mix to hardware and creates a slight gross margin headwind."

For the company "slight" was accurate: operating expenses fell 3.7 points as a share of revenue, clawing back the 2.1 points and more, and adjusted operating margin reached 35.9%.

The market looked at gross margin instead, because gross margin measures not how well a company is run but where it stands in its supply chain.

The Memory Inside the Network

A switch is a fast computer: it needs memory to queue packets and hold routing tables, and the switches stitching thousands of accelerators together need deeper buffers and larger tables.

Patterson quantified the exposure: "...95% of what we sell are not servers... roughly 15%-20% of the bill of materials might be memory related."

The Mechanism: Where 2.1 Points Went

Cisco's first response was to raise prices, and Patterson measured it: the increases added roughly five points to quarterly revenue growth, applied to hardware with higher memory content.

Not all of it came from memory — management split the compression between mix and component cost — but the order of magnitude is right. TrendForce's July 9 note projects server DRAM contract prices rising 13–18% in the third quarter alone; four quarters at that pace is roughly 70% a year.

In dollars: $14.7 billion of revenue at 68.4% is $10.0 billion of gross profit; this quarter 66.3% of $17.3 billion is $11.5 billion. Revenue grew 18%, gross profit 14%; had the margin held it would have been $11.8 billion — a gap of $0.36 billion a quarter, roughly $1.4 billion a year.

And it does not stop here: guidance for the first quarter of fiscal 2027 is 65–66%. What sank the stock was that guidance, not the past quarter.

Who Has a Contract and Who Doesn't

The increase does not land on everyone equally, and that is the real dividing line. TrendForce's July note is explicit: several U.S. cloud providers signed multi-year supply agreements restricting increases, so the rise falls on buyers without them.

SanDisk is the same structure from the other end. Eight customers signed multi-year deals covering roughly half of fiscal 2027 shipments and two-thirds of fiscal 2028, with volumes committed and pricing pre-agreed. Hence a promised margin near 80% out to 2030.

Cisco is not on that list; it has a direct relationship with TSMC and investments in suppliers such as Nanya. Patterson said supply is not the constraint — but that is quantity, not price.

The stock had run more than 60% higher through the year before the drop.

The Dow's One-Sided Basket

QQQ, tracking the Nasdaq 100, rose 1.33% while DIA, tracking the Dow, finished flat at +0.07%. The Dow is price-weighted: influence depends on the dollar level of a share price, and at the current divisor a $1 move is worth roughly 5.94 index points.

Assuming an index represents "the market" assumes both sides of a story sit in its basket. On Thursday that did not hold.

What's Left Standing

Memory supply should stay tight into the second half of 2027; TrendForce projects server memory bit supply growing only 15–20% a year, trailing server CPU shipments. Cisco's bill is not a one-off.

The profit from AI investment does not accumulate evenly along the chain. The same capex wave that lifts a memory maker's margin toward 80% pushes the buyer's margin down by two points. Both get filed under "AI winners."

Earnings figures in this piece come from Cisco's fourth-quarter press release of August 12, 2026 and the transcript of the investor call held the same day. Memory contract pricing data is drawn from TrendForce's July research notes; intraday share and index moves are from the August 13, 2026 session close. The gross margin calculation is a model built for this article from the company's reported margin ratios and the bill-of-materials and price-increase figures management gave on the call; it is not a company disclosure.

Correction (September 13, 2026): prose tightened for rhythm; figures and sources unchanged.