During the post-market session on Sept 9, Big Tech stocks showed divergent performance. Apple (AAPL.US) rose 0.63% in post-market trading to $317.33, with post-market volume of approximately 2.24 million shares and turnover of about $707 million. Amazon (AMZN.US) edged up 0.03% to $252.48. Alphabet (GOOGL.US) gained 0.12% to $331.05, with post-market turnover of approximately $1.41 billion.

On the other hand, Meta (META.US) fell 0.65% in post-market trading to $649.45, with post-market volume of approximately 1.31 million shares. Tesla (TSLA.US) declined 0.31% to $366.66. TSMC (TSM.US) retreated 0.11% to $434.86. Overall, Big Tech stocks showed limited volatility during the post-market session, with investor sentiment remaining cautious.

Looking at the full day's performance, Big Tech stocks showed mixed results during regular trading hours. META surged 6.55% in regular hours, standing out as the sector's highlight, driven by optimistic market expectations for AI business. AAPL fell 0.28% in regular hours, AMZN declined 1.78%, GOOGL dropped 2.28%, TSLA fell 0.10%, and TSM declined 0.83%. Post-market performance contrasted with regular session trends, indicating investors were adjusting positions on certain names after the close.