Palantir Technologies Inc. (PLTR.US) has endured six consecutive trading days of sharp declines, wiping out over $73 billion in market capitalization and delivering an unexpected rare victory to short sellers who have been consistently bruised throughout the year.

Since hitting an all-time high on August 12, the AI and data analytics-focused American data software giant has plummeted more than 17%, marking its longest losing streak since April 2024 and heading toward its worst weekly performance since the "tariff storm" in early April.

According to S3 Partners LLC data, this latest decline has generated over $1.6 billion in profits for short sellers, though this barely scratches the surface of the $4.5 billion in paper losses that Palantir short traders have accumulated year-to-date. Despite becoming the worst-performing component of the S&P 500 index over the past six trading days, the stock still leads the benchmark index with a stunning 106% gain in 2025.

This remarkable surge has pushed Palantir's valuation to dizzying heights. However, over the past year, contrarian traders have largely abandoned shorting the stock as its upward momentum appeared unstoppable. The short interest as a percentage of float—a key metric measuring the scale of available shares for shorting—has declined from nearly 5% a year ago to approximately 2.5%.

S3 Partners Managing Director Matthew Unterman noted that this indicates short sellers were forced to cover their positions as the stock climbed. "They either wanted to avoid this unstoppable momentum trading juggernaut, or they were forced out after being steamrolled by this freight train," described Interactive Brokers Chief Strategist Steve Sosnick regarding the shorts' predicament.

The current decline represents a microcosm of the broader tech selloff: heavyweight stock corrections are dragging down the S&P 500 and Nasdaq 100 indices as investors take profits and rotate toward lower-valued sectors.

Fny Capital Management Portfolio Manager Vikram Rai emphasized: "Palantir's selloff was long overdue and is not being driven by short sellers. When tech giants like Google (GOOGL.US), Meta (META.US), and Microsoft (MSFT.US) are all falling, severely overvalued high-beta stocks inevitably bear the brunt."

Unlike short squeezes that trigger covering rallies, this year's Palantir surge has been primarily driven by long investors. Notably, as the stock shows signs of weakness, short sellers are quietly returning. S3 data reveals that short positions have increased by approximately 10 million shares since early June (the company has about 2.3 billion shares outstanding).

Wall Street professionals predict that even if the stock quickly rebounds, contrarian short positions in Palantir will likely continue to build alongside any price recovery. "As soon as Palantir shows any signs of bouncing, the shorts will come back," Rai stated, adding, "While lacking a more precise description, the stock has indeed shown a downward trend." He also acknowledged being cautious about establishing short positions.