Broadcom's Summer of Mixed Signals: Nvidia's Tailwind Meets Marvell's Shadow

Broadcom shares bounce 3.4% on Nvidia's earnings, yet remain 27% below highs amid Marvell-Google AI chip deal and RBC downgrade.

The semiconductor sector caught a welcome bid on Thursday, and Broadcom rode along for the ride. Shares in the chipmaker advanced 3.4 percent to 315.70 euros in Frankfurt, but the catalyst had nothing to do with anything the company itself reported. Nvidia's blowout quarterly numbers, released after Wednesday's closing bell on Wall Street, lifted the entire AI-chip complex—AMD, Micron, and SanDisk all joined the rally.

That collective sigh of relief, however, masks a more complicated picture for Broadcom investors. Strip away the sector-wide beta effect, and the stock remains firmly in the red over the past month, down 5.8 percent on a 30-day view and sitting roughly 27 percent below its 52-week high of 429.60 euros. The technicals tell a similar story of a title still working its way out of a slump: the relative strength index sits at 40.6, the shares trade 6.1 percent beneath their 50-day moving average, and they hover just below the 200-day line. Thursday's gain, in other words, is a bounce—not a breakout.

The real story of the summer, and the source of Broadcom's recent weakness, has little to do with Nvidia and everything to do with a rival's encroachment on the company's most prized turf. In mid-August, Marvell Technology and Google unveiled a custom-chip agreement covering AI inference accelerators. The market's verdict was swift and unforgiving: Broadcom shares shed 5 percent in a single session as investors digested the prospect of erosion in the company's near-exclusive grip on hyperscaler AI ASIC contracts. If Google's custom-silicon orders start flowing to Marvell, a cornerstone of Broadcom's margin structure comes under pressure—and that pricing concern is likely to shadow the stock well beyond any single day of trading.

The irony is that Broadcom's operational momentum has rarely looked stronger. In the fiscal second quarter, revenue climbed 48 percent to $22.187 billion, while AI semiconductor revenue surged 143 percent to $10.8 billion—comfortably ahead of the company's own guidance. Management has guided to $29.4 billion in total revenue for the fiscal third quarter, a 84 percent year-over-year jump, with AI chip sales expected to hit $16 billion. Those figures help explain why the stock still trades 22 percent above its level of twelve months ago, even after the recent pullback. Growth of that magnitude at least partially offsets the Marvell anxiety.

The bull-bear tension playing out across the market is stark. Cathie Wood's ARK Invest bought 57,705 Broadcom shares on Wednesday—worth roughly $20.5 million at the closing price of $355.59—as part of a broader portfolio reshuffle that also saw the fund acquire positions in Cerebras and Cloudflare while trimming 37,977 AMD shares valued at about $18.3 million. The message from ARK is unambiguous: when it comes to custom AI chips, Broadcom is the preferred horse. The fund's conviction is bolstered by reports that the AI accelerator Broadcom developed jointly with OpenAI, codenamed "Jalapeño," outperforms Nvidia's current Blackwell generation on inference efficiency. According to SemiAnalysis benchmarks, the chip achieves up to 700 tokens per second on the DeepSeek-R1 model, versus 169 for the comparable Nvidia solution. Development reportedly took nine months, with a pilot run slated for late 2026 and mass production following in 2027. The Yole Group sees this as a genuine threat to Nvidia's inference margins, even if analysts caution against calling it an "Nvidia killer."

On the other side of the ledger, RBC Capital has poured cold water on the near-term outlook. The firm downgraded Broadcom to "Sector Perform" with a hold rating, citing negative technical signals and projecting a potential decline of roughly 6.6 percent over the next three months. RBC's probability-weighted range spans from $318.81 to $422.05 at a 90 percent confidence interval. The stock's drift in U.S. trading on Wednesday—from $356.74 to $355.59—offered little comfort to the bears, nor does the German listing's current level of 309.20 euros, which sits 8 percent below its 50-day average of 336.17 euros and 28 percent off the 52-week high. The RSI reading of 36.1 flags oversold conditions, underscoring just how divided the market has become.

Adding to the mixed picture: insider activity over the past 90 days shows net selling of more than $20.9 million, even as ARK added to its position. The smart-money signals are pointing in opposite directions.

The decisive moment arrives on September 2, when Broadcom reports fiscal third-quarter results. That print will reveal whether the company can clear the $16 billion AI revenue bar it set for itself—and whether the Marvell-Google deal has already begun to leave visible marks on the company's forward guidance. Until then, Thursday's Nvidia-driven pop is best understood for what it is: a sector-wide exhale, not a verdict on Broadcom's competitive position.