Marvell Technology Inc. fell 7% to $220.04 in midday trading Monday, leading a selloff in AI-linked semiconductor stocks after senior AI executives debated slowing frontier-AI development and investors turned cautious ahead of the Federal Reserve's rate decision. The decline erased part of Marvell's 159% year-to-date advance. Broadcom fell 4% to $346.03, NVIDIA retreated 3% to $211.87, Advanced Micro Devices dropped nearly 6% and Super Micro Computer lost more than 7%. The iShares Semiconductor ETF fell 5%, compared with a 0.3% decline for the Invesco QQQ Trust, indicating that pressure was concentrated in semiconductor companies whose valuations depend heavily on future AI infrastructure spending. Anthropic CEO Dario Amodei called for greater coordination on frontier-AI safety and described China as the "toughest dilemma" in establishing a global "speed limit" on development. OpenAI CEO Sam Altman and SpaceX CEO Elon Musk supported the broader effort, according to the Financial Times. The Federal Open Market Committee, or FOMC (the Fed's rate-setting committee), meets Tuesday and Wednesday, with a rate increase widely expected. Higher rates reduce the present value of distant cash flows, increasing pressure on high-multiple growth stocks. Marvell remains about 40% above its 200-day simple moving average, but trades below its 20-day and 100-day averages and near its 50-day average. Wall Street's consensus remains Buy, with an average price forecast of $295.25, although its strong growth and momentum scores contrast with a very low Value score. Investors will watch whether Marvell holds its intraday lows through the FOMC statement and whether the AI safety debate develops into a broader reassessment of semiconductor valuations.