On September 18th local time, the three major US stock indices closed higher across the board. At the close, the Dow was up 0.27% at 46,142.42 points, the S&P 500 was up 0.48% at 6,631.96 points, and the Nasdaq was up 0.94% at 22,470.73 points. All three major US stock indices set new closing records.

Large tech stocks were mixed, with the "Magnificent Seven" index rising 0.61%. Among individual stocks, Nvidia rose over 3%, Google rose 1%, and Facebook rose 0.58%; Tesla fell over 2%, Apple fell 0.46%, Microsoft fell 0.31%, and Amazon fell 0.17%.

Chip stocks generally rose, with Intel surging over 22%. The Philadelphia Semiconductor Index (SOX) rose 3.6%, refreshing its historical high.

Applied Materials rose over 6%, ASML rose over 6%, Lam Research rose over 5%, Micron Technology rose over 5%, while ARM fell over 4%.

On the news front, on the 18th local time, US President Trump and UK Prime Minister Starmer signed a US-UK technology cooperation agreement at Chequers. Trump stated this move would solidify the friendship between the US and the UK. The UK government indicated that investments by US tech companies in the UK could help create over 5,000 jobs in Britain.

Intel's stock price surged 22.77%, and Nvidia's stock price rose 3.49%. Nvidia announced it would spend $5 billion to purchase Intel common stock at $23.28 per share. In terms of cooperation content, Intel and Nvidia will collaborate on developing AI systems for data centers, and Intel will incorporate Nvidia's graphics processing technology into its next-generation computer chips. Nvidia CEO Jensen Huang said in a conference call, "This will be an incredible investment." Furthermore, Nvidia will support Intel CPUs in its NVLink cabinets in the future.

Regarding economic data, US initial jobless claims recorded their largest decrease in nearly four years. US initial jobless claims for the last week were 231,000, compared to an expectation of 240,000; the previous figure was revised from 263,000 to 264,000.

White House economic advisor Hassett stated that the Federal Reserve's interest rate decision is a good first step; the Fed's rate cut moves in the right direction of significantly lower rates; economic growth will be achieved without inflation.

According to CME's "FedWatch Tool", the probability of the Fed keeping rates unchanged in October is 8.1%, while the probability of a 25 basis point cut is 91.9%. The probability of the Fed keeping rates unchanged in December is 0.7%, the cumulative probability of a 25 basis point cut is 15.4%, and the cumulative probability of a 50 basis point cut is 83.9%.

Most China-concept stocks declined. The Nasdaq Golden Dragon China Index fell 1.79%, and the China-concept Tech Leaders Index fell 2.06%.

Among individual stocks, Zeekr fell over 5%, JinkoSolar fell nearly 5%, Daqo New Energy fell over 4%, Tencent Music fell over 4%, NetEase fell over 4%, while Hesai Group rose nearly 3%, Lufax Holding rose over 2%, 21Vianet (Century互联) rose nearly 1%, and Tuya Inc. rose nearly 1%.