Meta Platforms is ripping toward a new milestone, with shares up 36% in September and roughly 1% away from a $2 trillion market value, after a run of product launches and legal relief helped flip the stock from laggard to standout. The rally marks Meta’s best month since July 2013 and extends a rebound that has made it the third-best performer in the S&P 500 since an Aug. 18 low, a sharp reversal for a company that was down 18% for the year less than six weeks ago.
What changed is not one thing, but a sequence. Meta settled a social-media lawsuit for as much as $18 billion, announced partnerships with Instacart-owner Maplebear and Expedia, and then rolled out its Muse personal AI assistant, which rose to the top of app charts. For investors, the story has shifted from whether AI would hurt Meta’s core business to whether the company can use AI to widen its lead.
The stock’s surge has also reset the valuation conversation. Meta now trades at 21 times forward earnings, a discount to the Nasdaq 100’s 22 times, even after the latest run. That gap matters because the market is paying for growth, not just size, and Meta has suddenly re-entered the conversation as one of the market’s most compelling large-cap growth names. More than 90% of Bloomberg-tracked analysts rate the shares a buy, suggesting the Street’s bias is still tilted toward more upside.
The immediate catalyst was Muse, Meta’s personal AI assistant, which climbed to the top of app charts after release. That matters because it gives traders a visible sign that Meta’s AI push is not just a research story or an internal infrastructure upgrade. It is reaching consumers. Rob Biederman, co-founder and managing partner at Asymmetric Capital Partners, said, “Muse clearly validates its AI strategy and position, after a year and a half where the stock was basically flat because people didn’t know if AI was going to be a net positive or a net negative.”
That line captures the emotional swing in the market. For much of the past year and a half, Meta was caught in the same debate weighing on many megacap tech stocks: does the AI spending spree produce a durable product edge, or just a larger bill? Muse gave bulls a cleaner answer, at least for now. It is not enough to prove the full business case, but it has become evidence that Meta can turn its AI investments into consumer-facing products quickly enough to keep investors engaged.
Biederman also said, “It’s logical that AI agents will become the front door to the internet for a lot of people, which puts the balance of power in Meta’s favor.” That is a big claim, but it shows the bull argument in plain language: if users increasingly start their online activity through AI assistants, the company controlling those interfaces can gain more leverage over attention, traffic and monetization. Meta’s platform scale gives that thesis extra punch.
The speed of the turnaround is what makes the stock move feel so dramatic. Less than six weeks ago, Meta was down 18% for the year after a disappointing late-July revenue forecast. At that point, it ranked among the 50 worst S&P 500 performers through Aug. 18, according to the fact pack. The market was focused on whether spending on AI, infrastructure and product development was getting ahead of returns.
Since then, the stock has surged 43% from the Aug. 18 low, making it the third-best performer in the S&P 500 over that stretch. That kind of rebound tends to attract momentum traders, but it can also force fundamental investors to reassess. When a stock has already moved this far this fast, the bar for disappointment rises. Meta is now being judged not on whether it can recover, but whether it can justify becoming a $2 trillion company.
That transition from damage control to validation is why the current setup feels different from a normal bounce. The legal settlement removed one source of uncertainty. The partnerships with Maplebear and Expedia expanded the story beyond core advertising. Muse gave the market a proof point for AI adoption. Together, those developments created a narrative the market can price with more confidence.
Even after the rally, Meta’s multiple is not screaming excess. At 21 times forward earnings, the stock is still cheaper than the Nasdaq 100 on a forward basis. That matters because it suggests the market is not pricing Meta as a speculative AI story, but as a mature profit engine with fresh optionality. In other words, investors are getting AI upside without paying the kind of premium usually reserved for companies with thinner earnings bases.
Doug Anmuth, a JPMorgan analyst, reinforced that view, saying, “There’s still meaningful upside potential as Meta is in the early stages of releasing frontier models and AI-driven products beyond advertising.” The key phrase is “beyond advertising.” That is where the market keeps pushing Meta’s long-term story. Advertising remains the core business, but the next leg of growth will depend on whether the company can create products that broaden usage and deepen engagement across its apps.
That said, the valuation also imposes discipline. A stock that is only about 1% from a $2 trillion market cap cannot rely forever on novelty. The market will want evidence that Muse, and whatever comes next, can translate into sustained user growth, stronger monetization and durable product adoption. The good news for bulls is that Meta is no longer trying to explain why AI spending matters. It now has to prove how much.
The next catalyst is already on the calendar, at least roughly. Meta’s next-generation AI model, codenamed Watermelon, is expected to launch later in October 2026. That gives the market another checkpoint soon after the current rally, and it will likely shape whether September’s jump is remembered as a rerating or a re-rating that still has room to run.
Meta Connect developer sessions also continued on Sept. 24, with follow-through on product execution now the near-term focus. That framing is important. Investors have moved past the phase where big AI promises alone were enough to boost sentiment. The company must keep shipping. If Watermelon lands well, it could reinforce the sense that Muse was not a one-off. If it disappoints, the stock’s near-term momentum could cool fast after such a steep run.
For now, though, the balance of evidence favors the bulls. The legal overhang has eased, partnerships are broadening the story, and Muse has given traders a concrete product to point to. Meta is not just recovering from a bad stretch; it is back in the market’s top tier of momentum names, with a $2 trillion valuation now close enough to feel less like a milestone and more like a checkpoint. The question is whether the company can turn this month’s burst of excitement into a durable higher floor before October’s next AI test arrives.
