October 2025 in returns

October 2025 was loud in places and hollow underneath. Japan's Nikkei gained 16.6%, the Nasdaq 4.7%, AMD 58.3% and Nvidia 8.5% — and yet only 468 of 869 stocks (54%) finished higher, and crypto fell apart entirely at 39 of 175 coins green (22%), with Solana down 10.3% and Ethereum 7.2%. Zcash was the exception and an extraordinary one, up 445.3%, joined by a handful of microcaps whose moves say more about float than fundamentals.

Sandisk rose another 77.7% on top of September's 113.8%, and that persistence is the tell: a two-month double in a storage name is a cycle, not a trade. AST SpaceMobile gained 63.5%, Nokia 43.7% and Celestica 39.8%. The month's worst was Fiserv at -48.3%, an unusually violent single-name break, with Alexandria Real Estate -30.1% and F5 -21.7% behind it. What makes October worth reading carefully is the gap between its headlines and its internals — a 16.6% move in a major index alongside barely-positive breadth and a collapsing crypto tail describes a market whose gains are being generated by fewer and fewer participants. That is the condition that precedes a November like the one that followed.