The dominant equity story on Thursday was a renewed retreat from AI-linked technology shares, as investors questioned the pace of data-centre spending. Major US indices fell sharply; oil moved the other way, recovering ground after the previous session's slump. That split matters: one risk narrative did not explain every asset.
The tape at a glance
| Market | Direction | Read |
|---|---|---|
| S&P 500 / Nasdaq | Down | AI and technology shares led a broad sell-off |
| Brent crude | Up | Rebounded to a $98.29 settlement |
| EUR/USD | Down | About 0.1% lower over the UTC day |
| Bitcoin | Down | About 5.5% lower over the UTC day |
Indices
The S&P 500 closed at 7,353.73, down 4.36%; the Nasdaq Composite ended at 24,315.00, down 5.52%; and the Dow finished at 51,523.06, down 3.44%. Yahoo's dated daily bar and CNBC's closing quotes agree on the index closes, while both CNBC and the Associated Press describe the technology-led selling and concern about the AI data-centre buildout (AP). The session erased much of the post-election rally; the report points to a repricing of one crowded growth theme, not proof that every company tied to AI has the same exposure.
Commodities
Front-month ICE Brent, contract LCOF7, settled at $98.29 a barrel on the Nov. 5 New York session, up about 3.9%. CNBC's exchange-sourced quote records the contract and settlement date; AP and a dated petroleum market report independently give the same settlement and rise (AP; PFL Petroleum). AP linked the rebound to uncertainty around the Iran conflict and energy supply. This was a recovery after the prior day's sharp fall, not evidence that the broader equity risk mood had reversed.
Forex
EUR/USD slipped modestly across the explicitly defined 00:00 UTC-to-00:00 UTC window. Kraken recorded 1.12327 at the start and 1.12204 at the end; Bitstamp's corresponding candle ran from 1.12326 to 1.12170. Those venue records support a small decline, but not a claim about a New York close or a single confirmed catalyst (Kraken; Bitstamp).
Crypto
Bitcoin also weakened over that same UTC day. Coinbase's BTC/USD candle fell from $80,428.30 to $75,969.06; Kraken's XBT/USD candle showed a closely matching move, about 5.5% lower (Coinbase; Kraken). The shared direction with equities is consistent with risk-sensitive trading that day, but these observations alone do not establish that the stock sell-off caused the crypto move.
What it means for a systematic book
Thursday was a forceful, uneven session: equity benchmarks and Bitcoin fell while Brent rose. A portfolio built around one broad “risk-on” label would miss that divergence. For systematic research, the useful distinction is between observed co-movement and a tested relationship; one volatile session can prompt a review, but cannot establish a durable regime or an edge. Diversification and explicit rules are there to make that difference measurable rather than intuitive.