Palantir has delivered an extraordinary rally in 2025, with its stock up 150% year-to-date while revenue in the third quarter expanded by 63% year-over-year to $1.18 billion and non-GAAP net income climbed 110% to $0.21 per diluted share. The company’s Gotham and Foundry platforms integrate data into a decisioning framework that improves through machine learning, and its adjacent Artificial Intelligence Platform enables natural-language workflows. Industry benchmarks underscore its strength: Forrester ranks Palantir as a leader in AI/ML and decisioning platforms, and IDC recognizes its decision-intelligence software leadership. With the AI/ML platform market forecast to grow at 38% annually through 2033, Palantir sits at the center of a rapidly expanding opportunity.

Despite stellar fundamentals, Palantir trades at an eye-watering 115 times sales, making it the most expensive stock in the S&P 500 by a wide margin (second-place peers trade at roughly 44 times sales). A review of 70 software companies over the past two decades shows that only seven have exceeded a 100 PS multiple, and all eventually slumped by at least 65%, with an average drawdown of 79%. Examples include Snowflake (peak PS of 222, down 73%), SentinelOne (148, down 83%), Zoom (123, down 90%) and Cloudflare (114, down 83%). Such precedents suggest Palantir’s valuation may be unsustainable.

History implies that once a software stock surpasses 100 times sales, the risk of a severe contraction is exceptionally high. Palantir’s peak valuation occurred in August 2025 at 137 times sales; applying the 79% average decline seen in similar cases points to a potential future valuation near 39 times sales. Even a less severe 60% correction would still leave the company trading at the highest PS multiple in the index. Warren Buffett’s warning—that overpaying for a great business can negate years of growth—resonates strongly for Palantir’s current risk-reward profile.

On the positive side, Palantir continues winning large government and defense contracts—£1.5 billion with the U.K. government, $10 billion for U.S. Army software and a $30 million ICE immigration-tracking deal—and is forging space-sector partnerships to broaden its market reach. Yet the stock’s extreme valuation tilts the risk-reward heavily toward downside, even as its AI-driven growth story remains compelling. Investors may wish to limit position size or await a valuation reset before increasing exposure, balancing Palantir’s market leadership against valuation-induced volatility.