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Here is what Microsoft Co Pilot (AI) has to say on the subject:

is Citadel Advisors LLC a famous short seller?

Yes — Citadel Advisors LLC is well-known for its short selling activity, among many other trading strategies. As part of the broader Citadel enterprise founded by Ken Griffin, the firm is one of the largest and most influential hedge funds globally, with hundreds of billions in assets under management.

Citadel frequently takes short positions across various markets. As of July 2025, it held dozens of active short positions in companies across Europe and North America, including names like SMA Solar Technology AG, Signify NV, and Valeo3. These positions are typically disclosed when they exceed regulatory thresholds, such as 0.5% of a company’s issued share capital.

While Citadel isn’t exclusively a short seller — it also engages heavily in long positions, options trading, and market-making — its short trades often attract attention due to their scale and timing.