Its correlation to the index leaves real room for its own story, and its up-day and down-day readings show what that story costs in swings.
Palantir Technologies (PLTR) has gained 29% over the past five trading days, against 5.6% for the S&P 500, a stretch that coincided with its second-quarter 2026 results. The instinct after a run like that is to get in before it gets away. The better question is how much of this stock’s return is its own story rather than the market you already own and what it does to your portfolio’s swings.
Only Part Of Palantir’s Direction Comes From The Market You Own
Over the past five years the stock’s correlation to the S&P 500 is 0.53, a middle reading that means it shares some of the market’s direction while retaining behavior of its own. The business explains where that own behavior comes from. Second-quarter 2026 revenue grew 93% year over year to $1.935 billion, and the U.S. business is now over 81% of the total, with both of its halves compounding quickly: U.S. government revenue grew 90% year over year on defense and civil programs, and U.S. commercial revenue grew 149% as customers moved from pilots to multi-year deals on its AIP software platform. By the company’s own account, its trailing-twelve-month Department of War revenue is still less than 25 basis points of the Pentagon’s budget. Program awards and enterprise deal cycles set the pace of Palantir’s revenue, and they do not run on the market’s clock. Near-zero correlation is available elsewhere, and against this stock it costs return: gold has a 0.09 correlation to PLTR and returned 17.9% annualized over those five years, against PLTR’s roughly 47% and the S&P 500’s 13.3%.
Capturing 262% Of The Market’s Down-Day Losses
Diversification is usually sold as smoothing, and this is where the stock stops cooperating. That 47% came at 67% annualized volatility against 17.2% for the index. The one-year capture readings are blunter: on days the S&P 500 rose over the past year, PLTR captured about 188% of the gain, and on days it fell, it took about 262% of the loss. Those are trailing-one-year figures and they can shift, but they say the stock amplifies both directions and falls harder than it rises, so it raises a portfolio’s amplitude rather than damping it. The last twelve months show that swing in plain form: the stock has returned -1.4% over that stretch and still trades about 24% below its 52-week high, even after this run. A drawdown of that depth takes a larger percentage gain to undo than the percentage that created it, which is the arithmetic the Trefis High Quality Portfolio is built around.
A Differentiated Return Engine, Not Ballast
On five years of evidence this is a return stream with real independence from the index, and over that window it has paid, but it is not a stabilizer. The business signal that decides the next stretch is conversion: PLTR closed the second quarter of 2026 with $13.1 billion of total remaining deal value, up 83% year over year, and the useful question is how quickly that deal value turns into billed revenue. Sizing the swing is a separate job, and the options market already prices how far this stock is expected to travel.
What Would You Do With A Gain Like PLTR’s 626%?
Diversification is the rare free lunch in investing, and the hardest part is applying it to a position that has already grown large. PLTR is up 626% over the past five years, and gains like that are exactly how one holding quietly becomes too large a share of a portfolio. Whether that has happened in your portfolio is exactly what the Trefis Wealth team checks, with the same rules-based systematic discipline that runs our High Quality Portfolio. Request a free vulnerability audit of your biggest positions.
