Alibaba Group Holding Ltd. slid 8.6 pct after a fiscal first-quarter earnings miss revealed AI capital spending running 4.5 times faster than new cloud revenue growth, while Tesla Inc. surged 5.1 pct on Nevada's approval of 5,000 robotaxi permits for Las Vegas and Cloudflare Inc. gained 5.1 pct after reporting that AI-agent traffic had crossed half of all network volume. The S&P 500 closed up 0.43 pct to 7,674, the Nasdaq Composite added 0.43 pct, and the SOXX semiconductor ETF slipped 0.44 pct as the week's bond volatility eased into Friday's session.
Top AI stocks today: August 21, 2026
| Ticker | Close | Day | 1mo | YTD |
|---|---|---|---|---|
| $TSLA | $362.86 | +5.14 pct | +15.92 pct | -17.17 pct |
| $NET | $293.14 | +5.10 pct | +11.82 pct | +49.55 pct |
| $SOUN | $7.32 | +5.02 pct | +18.83 pct | -30.94 pct |
| $SNOW | $332.78 | +3.58 pct | +24.14 pct | +53.56 pct |
| $PLTR | $179.94 | +3.44 pct | +46.39 pct | +7.20 pct |
| $BABA | $119.34 | -8.57 pct | +6.42 pct | -23.37 pct |
| $ARM | $243.32 | -2.95 pct | -6.42 pct | +112.08 pct |
| $INTC | $90.07 | -2.24 pct | -2.44 pct | +128.72 pct |
| $CRWV | $87.85 | -2.13 pct | +22.22 pct | +10.75 pct |
| $TER | $375.74 | -1.93 pct | +7.38 pct | +81.03 pct |
Alibaba slides on profit miss as AI spending outpaces cloud gains
Alibaba Group Holding Ltd. (NYSE: BABA) fell 8.6 pct to $119.34, its sharpest single-session drop in months, after fiscal Q1 2027 results showed adjusted earnings per ADS of $1.26, down 42 pct year over year and well below the $1.85 Wall Street consensus, per Benzinga. Cloud revenue rose 45 pct, the fastest pace in 22 quarters, yet AI capital expenditure is running at 4.5 times the rate of new cloud revenue growth, a ratio that spooked investors who had expected the AI buildout to begin generating visible returns. StartupHub.ai data shows 91,616 companies tracked in our global database, and among the AI cloud and infrastructure names in that universe, the gap between AI capital spending and near-term cloud payoff is a recurring pattern across both public hyperscalers and private names. The market's read: aggressive infrastructure spending is consuming cash faster than cloud contract wins can offset, and Alibaba's management will need to narrow that gap visibly to restore confidence.
Tesla gains on Nevada robotaxi clearance and European Semi push
Tesla Inc. (NASDAQ: TSLA) gained 5.1 pct to $362.86, notching its third consecutive weekly gain, after Nevada regulators approved up to 5,000 Tesla robotaxis for operation in Las Vegas, per the Motley Fool. The same week, TSLA announced plans to showcase its electric Semi truck at the IAA Transportation show in Hannover, Germany, in September, signaling a serious push into Europe's commercial-vehicle market. CEO Elon Musk stated that he expects Tesla to outperform Wall Street's five-year revenue forecast. The Nevada permit is a volume deployment clearance, not a limited pilot, and places Tesla's autonomous fleet on a commercial timeline ahead of most competitor schedules.
Cloudflare crosses the AI-agent traffic threshold
Cloudflare Inc. (NYSE: NET) rose 5.1 pct to $293.14 after reporting second-quarter results above expectations and raising full-year top-line guidance. The headline figure: non-human and AI-agent traffic has surpassed 50 pct of total network volume, a milestone that positions Cloudflare as foundational infrastructure for the agentic AI wave. The company sits at the intersection of AI inference delivery and zero-trust security, two of the highest-conviction enterprise IT spending categories in 2026. NET is up 49.6 pct year to date and remains a top name on AI stocks to watch lists for investors seeking AI-agent infrastructure exposure without direct chip-sector concentration.
Notable but quieter
SoundHound AI Inc. (NASDAQ: SOUN) added 5.0 pct to $7.32 on elevated retail volume, extending voice-AI momentum. Snowflake Inc. (NYSE: SNOW) gained 3.6 pct to $332.78, up 24 pct over the past month on AI data-platform spending tailwinds. Palantir Technologies Inc. (NYSE: PLTR) rose 3.4 pct to $179.94 and is now up 46.4 pct over the trailing 30 days, one of the strongest mid-cap runs among top 2026 AI stocks. On the downside, Arm Holdings plc (NASDAQ: ARM) dropped 3.0 pct to $243.32, extending a 10.4 pct five-day slide with no fresh catalyst. CoreWeave Inc. (NASDAQ: CRWV) fell 2.1 pct to $87.85, pulling back from a 22 pct one-month gain as investors reassess AI infrastructure buildout pacing. Intel Corp. (NASDAQ: INTC) slid 2.2 pct to $90.07, continuing a 13 pct five-day decline despite a year-to-date gain of 128.7 pct.