Market Wrap · August 28, 2026
Marvell Falls 10.3% on Its Own Guidance, and the Selloff Spread to Everything Expensive
The S&P 500 fell 0.23% Friday, a quiet index print that hides a genuinely dispersed session. Marvell fell 10.28% to $216.62 despite beating second-quarter estimates, on a softer-than-expected margin and fiscal-2028 guide. The same afternoon, a cluster of recent high-fliers — Tempus AI (−9.41%), WhiteFiber (−8.41%), IonQ (−7.68%), Coinbase (−6.33%) and Arm (−6.33%) — gave back gains built up over the prior sessions, while ServiceNow (+4.54%), Amazon (+3.97%) and Alphabet (+1.74%) rose. Gold fell 3.24%, silver fell 4.38%, and Bitcoin fell 3.04% alongside the equity move.
A soft company guide, a macro-driven reversal in high-multiple names, and a rotation into cash-generative software — three separate mechanisms netting out to a 0.23% index move. Source: Massive Market Data.
The tape was not one story — it was a split between the expensive and the cheap
Figure 1 · Full-tape dispersion, August 28
Every large loser Friday was a recent high-flier; every large winner was already profitable
Single-day close-to-close percent moves, August 27 to August 28 close, for 22 names AEA tracks across its holdings and watchlist. Losers cluster among recent momentum names; winners cluster among established, profitable large caps. Source: Massive Market Data.
Story one: Marvell beats, and falls anyway
Marvell reported record second-quarter revenue of $2.739 billion, up 37% year over year, and raised full-year guidance — then fell 10.28% to $216.62, its worst session in months, per The Motley Fool. The reason was margin, not growth: non-GAAP gross margin fell from 59.4% a year ago to 58.9%, and management guided third-quarter margin to 57.5–58.5%, as its lower-margin custom AI-chip business becomes a larger share of revenue. A separate Motley Fool report the same day added that investors were also unsettled by softer fiscal-2028 guidance and a lack of new detail on the scope and timing of Marvell’s Google custom-silicon partnership. At roughly 53x forward earnings, the stock had little room for a guide that reads as anything less than clean.
Story two: the Fed spoke, the tape rallied, then it reversed
Federal Reserve Chair Kevin Warsh delivered a Jackson Hole speech Friday emphasizing the Fed’s commitment to bringing inflation down. Major indexes initially read that as reassuring: The Motley Fool’s midday market report had the S&P 500 up 0.20%, the Nasdaq up 0.14%, and the Dow up 0.17%, with communication-services stocks leading. By the close, all three had round-tripped into small declines, and the same Fool report specifically flagged Marvell and Rubrik selling off “despite beating expectations” as investors “grew cautious following recent rallies and amid signals of potential rate hikes.” That reversal landed hardest on names that had rallied the most in the prior sessions: Nvidia fell 4.57% even after delivering a strong quarter of its own days earlier, Arm fell 6.33%, IonQ fell 7.68% after a 287% year-over-year revenue quarter that still trades at 55x forward sales, and Coinbase fell 6.33% as Bitcoin fell 3.04% and Ethereum fell 2.73%. I could not find dated, stock-specific negative headlines for Tempus AI, IonQ, WhiteFiber, Coinbase or Arm on August 28 — they are logged here as part of the broader rate-sensitive reversal rather than as company-specific news events.
| Ticker | Close | Change | Dated catalyst |
|---|---|---|---|
| Marvell (MRVL) | $216.62 | −10.28% | Q2 beat, but soft margin and FY28 guide |
| Tempus AI (TEM) | $64.04 | −9.41% | No dated headline found — profit-taking after a 75%+ August rally |
| GraniteShares 2x Nebius (NBIL) | $21.75 | −8.50% | Leveraged pass-through of NBIS’s move (2x by design) |
| WhiteFiber (WYFI) | $17.75 | −8.41% | No dated headline found — logged unexplained |
| IonQ (IONQ) | $39.20 | −7.68% | No dated headline found — high-multiple pullback |
| Arm Holdings (ARM) | $239.05 | −6.33% | No dated headline found — high-multiple pullback |
| Coinbase (COIN) | $178.64 | −6.33% | Tracked Bitcoin’s 3.04% decline |
| ServiceNow (NOW) | $144.71 | +4.54% | No dated headline found — enterprise-software bid |
| Amazon (AMZN) | $266.43 | +3.97% | Continued AWS-margin bull coverage |
Story three: the money went somewhere — profitable mega-cap software and retail
ServiceNow rose 4.54% to $144.71, the best performer among AEA’s 32 holdings, with no single dated headline explaining the move; a same-day Zacks piece noted Wall Street’s average brokerage rating on the stock is 1.35 (Strong Buy) even as Zacks’ own earnings-revision-based rank holds at a neutral Hold, which is a disagreement about the stock rather than a catalyst. Amazon rose 3.97% to $266.43 on continued analyst attention to AWS’ roughly 39% operating margin against 7.8% for e-commerce, and Alphabet rose 1.74% to $346.59, aided by the same Marvell news that hurt Marvell’s own stock — the market read Google’s expanding custom-chip relationship with Marvell as a positive diversification move for Alphabet, even as Marvell fell on the deal’s lack of disclosed terms. Microsoft, Apple, Meta, Netflix, Uber and Salesforce all rose between 1.2% and 2.4%, none among the day’s largest single-stock stories but consistent as a group with a rotation toward already-profitable names.
Full macro tape
| Instrument | Close | Change |
|---|---|---|
| S&P 500 (SPY) | $769.35 | −0.23% |
| Nasdaq-100 (QQQ) | $716.43 | −0.65% |
| Dow (DIA) | $535.06 | −0.03% |
| Russell 2000 (IWM) | $295.75 | −1.35% |
| 10-Yr Treasury (IEF) | $92.85 | −0.41% |
| Crude Oil (USO) | $129.70 | −0.24% |
| Gold (GLD) | $408.89 | −3.24% |
| US Dollar (UUP) | $28.18 | +0.57% |
| Volatility (VXX) | $18.36 | +1.44% |
| Semiconductors (SMH) | $553.11 | −3.47% |
| Silver (SLV) | $60.02 | −4.38% |
| Emerging Mkts (EEM) | $67.14 | −0.70% |
| Bitcoin (BTC) | $77,839.19 | −3.04% |
| Ethereum (ETH) | $2,443.00 | −2.73% |
Gold and silver falling alongside equities is consistent with a rates-driven reversal rather than a flight-to-safety day — gold and growth stocks rarely fall together on a pure risk-off move. Source: Massive Market Data.
What a Street price target implies, sized against Friday’s guide
Nvidia’s own guidance, reported the same week, calls for its data-center segment to clear $108 billion of revenue in the third quarter, with one Motley Fool analyst projecting the segment alone could exceed $100 billion in a single quarter before fiscal 2027 ends in January. That figure is Nvidia’s own guidance and an analyst’s projection from it — not an AEA forecast — and it is the kind of number Friday’s selloff in Nvidia, Arm and the broader semiconductor complex has to be read against: the sector’s fundamentals were not the thing that moved Friday.
| Nvidia data-center revenue, if Q3 guidance holds | Implied vs. Q2 actual ($89.0B) |
|---|---|
| Company guidance, Q3 FY2027 | +21.3% |
| Analyst projection: data center alone >$100B in a quarter, by Jan. 2027 | +12.4% from guided Q3 |
Assumptions, stated plainly. Both figures in this table are Nvidia’s own stated guidance and a named analyst’s extrapolation from it, not AEA’s independent estimate of what will happen. The comparison is simple arithmetic against Nvidia’s reported Q2 FY2027 data-center revenue of $89.0 billion; it assumes the guided figure is hit exactly, which guidance is not a guarantee of, and it says nothing about margin, competitive share, or the CPU-market expansion into AMD and Intel’s territory that the same week’s coverage flagged as a separate risk to those two names. The point of including it here: Friday’s semiconductor selloff was not accompanied by any dated news that revised these growth figures downward.
Elsewhere on the tape
Applied Digital fell 7.65% and Nebius fell 4.26%, both without a dated company-specific headline, consistent with the broader AI-infrastructure-adjacent pullback. CrowdStrike fell 4.19% and Fortinet fell 3.92%, continuing recent security-software weakness the site has flagged as unexplained in prior sessions. Vertiv fell 4.53% and Talen Energy fell 2.78%, both part of the same power-and-cooling-for-AI-data-centers cohort. None of these had a same-day story attached as of this writing.