Honeywell Aerospace shares tumbled 21% in their first full session of trading on the Nasdaq, wiping out early gains and sending a stark signal of investor caution following the company's recent spin-off from Honeywell International.

The steep decline came after the newly independent aerospace and defense business issued guidance that disappointed market expectations, triggering a broad-based selloff among traders who had initially bid up the stock at the open.

The 21% drop referenced in market commentary reflects the severity of the pullback from the session's peak, marking a difficult start for the ticker.

The stock opened with a surge of approximately 7%, reflecting pent-up demand from investors seeking exposure to the pure-play aerospace entity.

However, the momentum quickly reversed as the market digested the company's forward-looking statements.

By the close, shares had settled down 82 cents, or 0.4%, at $220.19, but the intraday volatility and the significant drawdown from the day's highs underscored the fragility of the initial enthusiasm.

The 21% drop referenced in market commentary reflects the severity of the pullback from the session's peak, marking a difficult start for the ticker.