US stock index futures fell; Nasdaq futures down 0.3%, Dow Jones futures down 0.2%, S&P 500 futures down 0.1%.

US Secretary of State Rubio said both Russia and Ukraine have expressed interest in a limited ceasefire covering grain and energy. He warned both sides have treated energy facilities as strategic targets, making negotiations over an energy ceasefire likely to be difficult, and said the US is willing to play a constructive role in advancing talks. Rubio added he discussed the conflict and bilateral ties with Russian Foreign Minister Lavrov and hopes President Putin will accept a G20 summit invitation as an opportunity for direct US-Russia dialogue.

1、當前標普500指數前十大成分股總市值佔指數比重接近40%，處於極端高位，顯著高於2000年互聯網泡沫頂點約27%的水平。 2、2022年熊市結束後，頭部大型企業持續跑贏大盤，推動這一佔比大幅上行15個百分點。 3、高度集中的市場結構暗藏顯著下行風險：僅少數幾隻龍頭股如果出現大幅下跌或是長期表現疲軟，就足以帶動整個指數走低。指數權重越集中，頭部個股走弱帶來的衝擊就越大。當前美股大盤，從未如此依賴少數幾家公司的表現。