Anthropic’s November IPO Deadline Tests Whether 2026 Window Stays Open

The calendar is the story now. With midterm elections six weeks out and the holiday shutdown looming, the IPO market has roughly 40 trading days left to salvage 2026. Anthropic’s decision on whether to file this week — Renaissance Capital’s Matt Kennedy says a prospectus could land as early as Friday — will determine if that window stays pried open or slams shut until 2027.

Three deals collapsed or cratered in the past week alone. Chinese manufacturer Kepuni Holdings yanked a $15 million Nasdaq listing Monday. Gravitics Holdings, a space-systems developer, cut its deal 60% to $50 million Tuesday. South Korea’s Elice Group plummeted 32% on debut Wednesday, the worst first-day drop ever for a Korean IPO raising over $100 million, according to Dealogic. Oura Ring pulled its offering hours before pricing in September.

Jay Ritter, the University of Florida professor known as “Mr. IPO,” puts the blame squarely on valuation disconnects. “Some of those companies have pulled their IPOs, rather than accepting a less optimistic valuation than they had hoped to get,” he said. “You’re just asking too much. It’s not that you’ve got a bad business model. It’s a question of price.”

The first half of 2026 looked different. Proceeds hit roughly $137 billion, Dealogic data show, but SpaceX’s $75 billion June offering carried most of that weight. Strip out the mega-deal and the picture frays.

Anthropic changes the math. A longtime investor, speaking to Fortune’s Shawn Tully, expects shares priced around $1.8 trillion — below the company’s $2 trillion target but implying a post-IPO valuation up to $2.4 trillion. That would exceed SpaceX’s $2.1 trillion first-day market cap. The draft prospectus reported Tuesday by the Wall Street Journal reveals the cost of that growth: an $80.7 billion net loss for the first six months of 2026 against $16.3 billion in revenue, up from $1.1 billion a year earlier.

Kennedy argues a successful Anthropic debut would reset investor psychology. “When investors make money with IPOs, they begin to put that money back into work on future deals,” he said. “With such a large deal, I think this has legs. It can help 2027 activity.”

But the filing has to happen now. Any slip past this week compresses the marketing timeline past the point where underwriters can comfortably price before Thanksgiving. After that, the midterm blackout and year-end lull make a 2026 debut nearly impossible. Companies that miss the window face a choice: accept a 2027 timeline or price at a discount the market hasn’t yet signaled it’s willing to pay.

Venture capital keeps flowing elsewhere. Arda Industries raised $160 million at a $1.5 billion valuation for AI manufacturing software. Eka Robotics secured $150 million for dexterous manipulation models. Daytona closed $60 million for AI agent infrastructure. Private markets still price optimism. Public markets, so far, demand proof.