New York, June 11, 2026, 15:05 ET
- RUBI was up about 43% and changed hands near $0.67, with intraday volume over 154 million shares.
- Trillium Trading now owns 175,000 Rubico Class A ordinary shares, or 5.4% of the class, according to a filing.
- The company had a 1-for-10 reverse stock split in April, and did a unit offering in May.
Rubico Inc. surged on Thursday, with RUBI on Nasdaq last quoted at $0.6732, up $0.2032, or roughly 43% from the day before. The stock started at $0.50 and swung between $0.46 and a session peak of $1.07. By 14:49 ET, trading volume hit 154.16 million shares.
Rubico drew attention after showing an outsized surge for a small-cap. Robinhood put its market cap at around $2.19 million, with about 153.54 million shares changing hands compared with an average of 6.31 million. Google Finance showed the market cap closer to $2.20 million and listed 3.26 million shares outstanding.
RUBI swung sharply during the session, trading as high as $1.07 and dropping to a low before settling near $0.67—well off the top but still up from the day’s bottom. The stock kept a busy microcap profile on the Nasdaq.
Trillium Trading, LLC disclosed a stake in Rubico, according to a fresh Schedule 13G out with the SEC. The filing shows Trillium owns 175,000 Class A ordinary shares in RUBI, or 5.4% of that class. Trillium has sole voting and dispositive power on those shares.
Trillium filed under Rule 13d-1(c) for an event dated June 10, 2026, with compliance officer Louis Capone signing off a day later, June 11. The certification said the securities weren’t held to change or influence the issuer’s control.
Rubico’s last capital markets update was in May, when it said it priced a public offering of 5,263,160 units at $0.95 per unit. Each unit had a common share or pre-funded warrant and 1.5 Class C warrants. The company said it expected to raise about $5.0 million in gross proceeds before expenses.
Rubico did a 1-for-10 reverse stock split in April. The board signed off on the split, which took effect at the opening bell April 9, 2026. Shares kept trading under the RUBI symbol on Nasdaq. Rubico said it aimed to boost its share price and stay in line with Nasdaq listing rules.
Shipping firm Rubico, registered in the Marshall Islands and run from Athens, owns and runs two 157,000 dwt Suezmax tankers it calls fuel-efficient and modern. The company trades shares on the Nasdaq Capital Market, ticker RUBI.
The company has warned in SEC filings about sharp swings in share price, saying these moves might not match the firm’s operations, mostly in thinly traded stocks or where activity jumps. That’s key for RUBI on June 11, since the official data points to a major intraday swing, very high volume, and a small market cap.
