C3is Inc. (NASDAQ:CISS) shares jumped 16.57% to $0.10 after the bell on Tuesday.
In the regular session, shares of the Greece-based shipping company closed at $0.088, down 21.34%, according to Benzinga Pro data.
C3is experienced an elevated trading session on Tuesday. Volume reached 67.91 million shares, about 3.16 times the stock’s average daily volume of 21.48 million shares.
SEC Filings Reveal Fresh Institutional Bets
The stock move comes after a Monday Securities and Exchange Commission filing revealed that venture capital firm Alta Partners LLC owns an 8.2% stake, or 1.16 million shares, including 28,303 shares associated with warrants.
In a separate SEC filing on the same day, private investment firm CVI Investments Inc., managed by Heights Capital Management Inc., disclosed a 9.9% stake totaling 1.22 million shares. This includes 980,000 common shares and shares linked to warrants, with ownership limited to the 9.99% threshold.
In late July, C3is priced a $6 million underwritten public offering of 11.54 million units.
Trading Metrics, Technical Analysis
C3is has a market capitalization of $1.07 million, with a 52-week high of $830.20 and a 52-week low of $0.08.
The Relative Strength Index (RSI) of CISS stands at 15.42.
Over the past 12 months, the stock has declined 99.98%.
Benzinga’s Edge Stock Rankings indicate that CISS has a negative price trend across all time frames.

Disclaimer: This content was partially produced with the help of AI tools and was reviewed and published by Benzinga editors.
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