Tariff plans and technology commitments shape Sunday's closed-market news

U.S. markets were closed Sunday, so QQQ and SPY remained at their carried Friday regular closes of $523.47 and $601.12, with no tradable reaction to the day's headlines. Trump said he would announce a 25% tariff on steel and aluminum imports on Monday. LEAP 2025 opened with $14.9 billion in technology investment commitments. T-Mobile launched a Starlink satellite-to-cell beta covering 500,000 square miles. Apple scheduled a Shanghai developer event and expanded home-robot hiring, while AI executives kept DeepSeek competition in focus.