York Space Systems (Yellowstone) Stock Price, News & Analysis
Company Description
York Space Systems (Yellowstone) (NYSE: YSS) is a publicly traded aerospace & defense company in the Guided Missiles & Space Vehicles & Parts sector. The company has a market capitalization of $3.6B, ranking #1,680 among all listed U.S. companies by market cap.
YSS stock has declined 16.6% over the past year. Shares last traded at $28.03.
This page provides a comprehensive overview of YSS stock, including real-time price data, latest news, SEC filings, insider trading activity, financial highlights, upcoming events, and short interest trends.
Stock Performance
York Space Systems (Yellowstone) (YSS) stock last traded at $28.03. Over the past 12 months, the stock has lost 16.6%. At a market capitalization of $3.6B, YSS is classified as a mid-cap stock with approximately 125.0M shares outstanding.
Latest News
York Space Systems (Yellowstone) has 4 recent news articles, with the latest published 6 days ago. Of the recent coverage, 2 articles coincided with positive price movement and 2 with negative movement. Key topics include earnings, acquisition, earnings date. View all YSS news →
SEC Filings
York Space Systems (Yellowstone) has filed 5 recent SEC filings, including 2 Form 8-K, 1 Form 4, 1 Form 10-K, 1 Form 4/A. The most recent filing was submitted on March 19, 2026. SEC filings provide transparency into a company's financial condition, material events, and regulatory compliance. View all YSS SEC filings →
Insider Radar
Insider buying activity at York Space Systems (Yellowstone) over the past 90 days may reflect management confidence in the company's direction. Institutional investors and analysts often monitor insider purchases as a potential bullish indicator for the stock.
Financial Highlights
Upcoming Events
PExT demonstration extended
Expanded PExT demonstrations
York Space Systems (Yellowstone) has 2 upcoming scheduled events. The next event, "PExT demonstration extended", is scheduled for January 1, 2027 (in 270 days). Investors can track these dates to stay informed about potential catalysts that may affect the YSS stock price.
Short Interest History
Short interest in York Space Systems (Yellowstone) (YSS) currently stands at 3.3 million shares, up 8.5% from the previous reporting period, representing 20.5% of the float. Over the past 12 months, short interest has increased by 100.6%. This high level of short interest suggests significant bearish sentiment among traders.
Days to Cover History
Days to cover for York Space Systems (Yellowstone) (YSS) currently stands at 4.7 days, up 304.3% from the previous period. This days-to-cover ratio represents a balanced liquidity scenario for short positions. The days to cover has increased 365% over the past year, indicating either rising short interest or declining trading volume. The ratio has shown significant volatility over the period, ranging from 1.0 to 4.7 days.
YSS Company Profile & Sector Positioning
York Space Systems (Yellowstone) (YSS) operates in the Aerospace & Defense industry within the broader Guided Missiles & Space Vehicles & Parts sector and is listed on the NYSE. In monthly performance, the stock ranks #4 among all tracked companies.