• Anthropic filed its S-1 on Monday, revealing the company's internal financials.
• Investors, researchers, and tech onlookers shared their thoughts.
• Some applied S-1 learnings to their own industries, like startups and venture capital.

Anthropic is ready to IPO. Analysts and onlookers are weighing in.

On Monday, the AI lab filed its hotly anticipated S-1 paperwork. The prospectus offered an inside look at Anthropic's financials: a net loss of about $42 billion in 2025 and revenue of $4.6 billion. It plans to trade under the ticker symbol ANT.

The S-1 sets the stage for a blockbuster IPO. Here's what smart people are saying about Anthropic's filing:

Sarah Guo, founder of Conviction

Venture capitalist Sarah Guo opened her X post with a big "CONGRATS" to Anthropic on the S-1 filing.

Guo shared her first takeaways: the inflection in operating profit, the focus on novel discovery, the mismatch between consumption-based revenue and long-term compute obligations, and more.

"I am curious to see how 1) a company with strong mission changes - or doesn't - how it operates under quarterly public inspection and 2) how public opinion may change when retail owns a piece of the upside," Guo wrote.

Gary Marcus, emeritus professor at NYU

Gary Marcus, one of the AI industry's most outspoken critics, wrote on X that Anthropic provided financial statements through June 30 — but omitted a full Q3 update.

He predicted that the company's economics had not improved, and alleged that Anthropic was "trying to skirt the truth."

Earlier this month, Business Insider reported that Anthropic told investors it generated $16.8 billion in third-quarter revenue, up 45% from the prior quarter.

Ann Bordetsky, founder of Elora Capital

Ann Bordetsky was a partner at New Enterprise Associates' technology practice before founding her own firm, Elora Capital. She wrote on X that the S-1 was a "juicy read."

The filing will set "a (high) bar for how capital markets evaluate AI startups," Bordetsky wrote.

Harrison Rolfes, Senior Late-Stage Research Analyst at PitchBook

In a note sent to Business Insider, Harrison Rolfes said Anthropic's filing shows just how fast the company is growing — and just how expensive that growth is.

His main positive highlight: the $11.6 billion in revenue in the second quarter. His big worries: the $321.4 billion in future lease payments that haven't begun yet, and the $265.6 billion in fixed minimum purchase commitments.

"The compute commitments are enormous, and the suppliers are also lenders," Rolfes wrote, pointing to financing arrangements with Google, Amazon, and Broadcom. "The price range, Q3 revenue and the total compute commitment are still blank, so the next amendment should fill in a lot."

Finally, Rolfes said it's important for investors to note that Anthropic's founders retain outsize voting power. Put plainly, "public shareholders won't control the company," he wrote.

Sam Ro, financial journalist and founder of TKer

Sam Ro, a financial journalist and former Business Insider reporter, wrote in his Substack that Anthropic's longwinded AI risk section shouldn't make investors fret.

If AI really does create an existential catastrophe, he wrote, "having money might not be your biggest concern."

He also said it's anybody's guess whether Anthropic's stock price will rise or fall after it opens on the market.

The company hasn't been consistently profitable, he said, but "a company's valuation depends less on what it earned (or lost) in the past and more on what it's expected to earn in the years to come."

Gavin Baker, managing partner at Atreides Management

On X, Gavin Baker wrote that Anthropic's annual recurring revenue has "likely gone vertical," even after the company cut prices on its AI tokens.

"I am shocked, absolutely shocked," he wrote. "$100b plus in year-end ARR looks possible again."

Jacob Bourne, analyst at eMarketer

Jacob Bourne, an analyst at EMARKETER, a sister company to Business Insider, wrote in an email that Anthropic's filing comes as investors are increasingly wary of debt-fueled AI infrastructure projects.

"Anthropic's decision to press ahead is particularly noteworthy given its own warnings about AI risks, signaling a willingness to face heightened public scrutiny," he wrote.

Bourne also said the S-1 comes as the cost of developing frontier models remains "eye-watering." It's all evidence that companies are turning to public markets for fresh investments "to remain at the cutting edge of AI development," he wrote.

SemiAnalysis

SemiAnalysis, the research firm founded by Dylan Patel, posted the "most mind blowing stat" it had seen in the S-1. It cited Anthropic's raised capital, compared to its cash and investments.

Anthropic is "growing at a rapid pace" and "profitable on an operating income basis as of the June quarter," SemiAnalysis wrote.

"This is likely the most efficient scaling of a business in the history of capitalism," the firm wrote.

Brad Gerstner, CEO of Altimeter Capital

Brad Gerstner heaped his praise on Anthropic. He congratulated the team on "another important milestone!"

Altimeter will partner with Anthropic through "major participation in the IPO on top of our existing ownership," Gerstner wrote. He used an American flag and a rocket emoji.

Gerstner's venture capital firm is a longtime investor in Anthropic, co-leading the AI lab's Series H in May.

Matt Murphy, partner at Menlo Ventures

During an interview on CNBC, Matt Murphy, one of Anthropic's earliest investors, said he's increasingly bullish on the AI lab.

"You wait your entire 25-year career to find a technology wave like this," he said. "To be able to have invested in the leader early is just phenomenal."

Vivek Gopalan, partner at 8VC

Vivek Gopalan is an investor at 8VC, the venture capital firm cofounded by Joe Lonsdale. He posted a graph from Anthropic's S-1 showing rising revenue per dollar of compute.

"You need to believe that this is monotonic and increasing," Gopalan wrote.

Dan Shipper, CEO of Every

Dan Shipper had "big news" to share: a joke about Anthropic's ever-present safety focus. He celebrated that the S-1 "doesn't say 'or it might kill / unemploy everyone' in the first paragraph!"

The CEO of Every, an AI agent startup, called it a "win for humanity."

Dadisi Olutosin, cofounder and CTO of DealView AI

Dadisi Olutosin said on LinkedIn on Monday that Anthropic’s IPO filing raised a question for potential investors: “When does an extraordinary company become an overpriced investment?”

Olutosin wrote that at a reported valuation of $1.5 trillion to $2 trillion, buyers would pay about 101 times the company’s trailing revenue, compared with roughly 20.5 times the revenue pace at which Series H investors bought in.

“Innovation can transform an industry,” Olutosin said. “That doesn’t make every entry price attractive.”

Sinan Aral, MIT professor and cofounder of Milemark Capital

Sinan Aral said Anthropic’s potential valuation could make it one of the world’s most valuable companies, but that its infrastructure commitments also pose a “tremendous economic risk.”

Aral told CNBC's "Squawk Box" show on Monday that he has questions about what the AI lab’s margins and profitability would look like as it spends hundreds of billions of dollars on infrastructure. Aral also said there are many risks described in the company’s S-1, including the possibility that its products could act on their own.

“The question is, where is the enduring value?” Aral said. “And I think the enduring value is going to come from companies that can demonstrate enterprise profitability, productivity, and actual value add rather than just providing intelligence.”

Nick Moran, general partner at New Stack Ventures

Nick Moran wrote on LinkedIn said Anthropic’s $80.7 billion loss in the first half of 2026 was largely an accounting story.

“Anthropic lost $80 billion on paper mostly because it became more valuable,” he wrote.

Moran said the bigger question for investors is the price they’ll pay. While Anthropic’s revenue growth remained “spectacular,” Moran wrote, it slowed from the second quarter to the third as the company sought a higher valuation.

“The loss is an accounting story. The multiple is the real one,” Moran wrote. "Institutional and retail demand is real. I wouldn't be surprised to see it end up on the higher end of the range."

Brian Sozzi, executive editor of Yahoo Finance

Brian Sozzi wrote on LinkedIn that he has three takeaways from Anthropic’s IPO prospectus: the banks leading the offering, the AI lab’s adjusted profits, and its warning about risks to humanity.

Goldman Sachs and Morgan Stanley are the lead underwriters and “will be cleaning up here on fees,” Sozzi wrote on LinkedIn, adding that Anthropic was profitable on an adjusted operating and net basis in the first six months of the year.

Chamath Palihapitiya, venture capitalist and "All-In" podcast co-host

Venture capitalist and "All-In" podcast host Chamath Palihapitiya praised Anthropic in a brief X post after the S-1 dropped.

"Ant is an amazing business…," Palihapitiya wrote in a Monday noon X post.

The VC has previously been critical about Anthropic, advising consulting firms not to deploy Anthropic and OpenAI's products.

"If you are running a consulting business and you are deploying Anthropic or OpenAI directly into your organization (I'm looking at you PwC and Accenture) you are letting the fox into the hen house," Palihapitiya wrote on X in May.

Anish Acharya, general partner at Andreessen Horowitz

Anish Acharya, a general partner at Andreessen Horowitz, said his earlier predictions about Anthropic's financials have largely held true, calling it a gross-margin-positive profile and "obviously a tremendous business."

Acharya's post on Monday was a repost of a September post, in which he laid out some predictions for Anthropic.

He said in the earlier post, "Overall I think the market underweights how sophisticated anthropic has been in aligning its business interests with its technical and mission interests."

Aaron Levie, CEO and cofounder of Box

Aaron Levie, the CEO of enterprise cloud company Box, said the industry is still in the early stages of AI adoption, as most companies have not started using AI agents in full force.

As deploying agents increases token consumption, the average Fortune 500 customer's spending on Anthropic products could rise, he said in a Monday X post.

"This S-1 gives you a sense of both the strength of the frontier lab business model - even amidst massive competition - and how early we are in the build out of AI," Levie wrote.

• Execs and analysts are sounding the alarm after AI discovered a flaw affecting the majority of the internet.
• Experts say critical systems, from energy and water to healthcare, may be especially exposed.
• Here's what smart people are saying about the biggest threats to the internet at the moment.

It's been a nightmarish week for cybersecurity.

AI helped discover two "critical" flaws in the infrastructure of PHP, a programming language that up to 70% of websites use, prompting companies to race to roll out a fix or risk being hacked.

The incident has illustrated how AI is creating a new level of risk for businesses and consumers online, in a week when multiple other cyber threats caused headaches for security workers.

Here's what executives and analysts are saying about the biggest cyber threat of the moment — and how AI could make things even worse.

Jason Clinton, Anthropic's deputy chief information security officer

Anthropic's deputy security chief, Jason Clinton, warns that a "vulnerability tsunami" is coming — and says critical infrastructure hasn't caught up.

Clinton posted on X on Wednesday about the need to "patch critical infrastructure" before core network vulnerabilities get exploited. On Thursday, he issued another warning to companies.

"As bad as things have gotten in the past 4 days, they are going to get a lot worse before they get better," he wrote.

"Security leaders, never let a crisis go to waste: please go to your boards and ask for help right now. not for ai, for the basics. (we need to hold on for ~18 months.)," he added.

Andrew Curran, AI analyst

Andrew Curran, a prominent AI analyst, weighed in on several cybersecurity threats from Wednesday to Thursday.

"Regarding potential attacks on energy, food, and water infrastructure, the threat is quite real. Someone is currently probing infra and feeling it out, it is an active threat. Even a little preparation can be helpful, just in case," Curran wrote on Wednesday in response to an NSA cybersecurity advisory about threat actors.

On Thursday, Curran also highlighted a hack of Quest Diagnostics, which he said serves "roughly half" of the US's hospitals and physicians.

Matt Shumer, AI investor

In February, Matt Shumer, the former CEO of Hyperwrite, published a viral essay on his website titled "Something Big Is Happening," in which he warned of large-scale disruptions wrought by AI that could upend the world order.

Shumer published another essay on Thursday on his website and LinkedIn, this time titled "The Internet Is Under Attack. Here's How to Protect Yourself and Your Family."

"Right now, as you read this, swarms of AI agents are likely trying to break into the websites you use. Not one of them. Many of them," Shumer wrote. "We are in the middle of the biggest cybersecurity moment in years."

This is what could happen, per Shumer's post:

Your information leaks, so scammers know your name, birthday, address and bank, and their calls and texts sound real. Your accounts get taken over through some site you used once, years ago, with the same password you use everywhere. And the things you depend on, like an app, a pharmacy or a store's website, go down for days.

To be clear: this is ongoing, but the worst-case scenarios people are most scared of haven't happened. I hope they never do. But it's better to be safe than sorry, especially since this is going to keep happening.

Shumer also outlined four ways people can protect themselves, including updating all their software and staying off sites they're unfamiliar with while companies and websites alike make their security updates.

He also advises that people protect their bank accounts by being extra cautious about any and all codes and links that they receive. People should also "close the doors you aren't using" by unplugging smart gadgets and deleting apps that aren't being utilized.

"Every connected thing is another way in," Shumer wrote.

Marc Benioff, CEO of Salesforce

Marc Benioff agreed with Anthropic's Jason Clinton in an X post on Thursday.

"Jason is 100% right. Code red," Benioff wrote, along with a red alarm emoji.

Sriram Krishnan, venture capitalist and former White House advisor

Sriram Krishnan, a prominent venture capitalist and former senior AI policy advisor for President Donald Trump, said that the PHP vulnerabilities are a "harbinger of things to come" as AI models continue to detect long-standing cyber issues.

"However the entire software supply chain will need the muscles to rapidly build and deploy fixes," he said in a post on X.

The new cyber reality may require more public-private partnerships to build the required infrastructure, he said.

Deedy Das, venture capitalist

The Menlo Venture partner Deedy Das warned that "the era of vibe hacking is here" in a series of posts on X.

He said he'd seen firsthand that "even non-technical people" can exploit common vulnerabilities, such as PHP, using AI models. Das said someone could theoretically direct certain models to any website and instruct them to quickly locate the vulnerabilities.

"Once you figure it out, it is downright trivial to do. The digital infrastructure of the world is at risk," he wrote.

Aaron Levie, CEO of Box

AI agents have ended the era of "security through obscurity" because they can devote once-unthinkable time and effort to finding vulnerabilities, Box CEO Aaron Levie said on X. People will need to upgrade legacy infrastructure, modernize security policies, and tighten access controls, among other measures, he said.

"Agents will help on the defensive side because they can both accelerate this work and equally simulate the risk vectors," Levie wrote.

Yet Levie thinks humans also have an important role to play in the cyber revolution — he predicted a boom in cybersecurity jobs, which could become a huge investment area for companies.

"You will need more talent to point the agents at the most critical work, review findings, patch systems, respond to incidents, and more," he said.