U.S. stock market movement: Petrobras surges on October 5th due to Brazil's election, Amapá's new oil layer, and oil exploration.

The Dow Jones closed up 0.18%, the Nasdaq rose 1.05%, and the S&P 500 gained 0.66%. Among the stocks with the highest trading volumes, Nvidia rose 2.12%, SpaceX surged 7.63%, Micron Technology fell 1.02%, and Tesla increased 2.2%.

Fitch Ratings has published a related assessment showing that oil hedging operations in North America have currently resulted in paper losses, while natural gas producers are moving to lock in favorable prices for 2028. It is understood that hedging activities by energy companies are primarily intended to counter commodity price fluctuations and stabilize operating cash flows. The recent paper losses in oil hedging are directly linked to the volatility in international oil prices. Meanwhile, natural gas producers' decisions to secure advantageous prices years in advance reflect the industry’s clear expectations regarding future supply and demand dynamics and price trends for natural gas. This early positioning aims to safeguard future profit margins and mitigate the operational uncertainties that potential market price fluctuations may bring.

Microsoft's internal Claude budget has been reduced by more than one-third from its peak, and the number of internal Claude Code users at Meta has dropped from around 60,000 to 30,000. Both companies emphasize that external customer demand is still growing, but the decline in internal usage puts pressure on Anthropic. According to Anthropic's IPO prospectus, two major clients together contributed about 25% of its revenue. Although the prospectus does not name specific clients, it is highly likely that Meta and Microsoft are these two clients or among them.