The S&P 500 rose 0.5% to fresh highs, but the rally lost breadth after three weeks of broad gains. The Nasdaq gained 1.5% while the Dow slipped 0.4%. Nvidia, AMD, Broadcom, Intel, and Micron drove nearly all of the S&P 500's advance. Intel surged 24.4% on Friday after beating estimates and guiding higher, posting its best single-day gain in 38 years and breaking its dot-com era record. Oil held near $106 per barrel, up from $96 at the week's open, as geopolitical premium persisted despite ceasefire optimism. Equal-weighted indices lagged the cap-weighted versions for the first time this quarter, signaling that the gains are concentrating in fewer names. For micro-cap investors, narrowing breadth in a rising tape is the warning signal that always precedes rotation.
This was the first week since the ceasefire rally began where market leadership contracted sharply. Without the five largest semiconductor names, the S&P 500 would have finished the week lower. The tape rewarded AI infrastructure exposure and punished breadth. Intel's 22% data center revenue growth validated the CPU renaissance thesis and triggered a fundamental re-rating. Defense stocks sold off through mid-week as ceasefire optimism built, then stabilized. For micro-cap allocators, the week demonstrated that post-crisis normalization does not mean broad participation. Cash-generative growth…