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RUBI 424B3: Material agreement

Rubico Inc.

Filed with the SEC on · accession 0001171843-26-006729

RUBI filed a 424B3 (prospectus (offering)) with the SEC on Oct 21, 2026. The final terms of an offering of shares or bonds. The stock moved +0.7% by the first close after the filing.

Summary of the filing

Rubico Inc. entered into a Securities Purchase Agreement with an institutional investor to issue up to $15 million in Senior Convertible Notes and warrants, with the initial $8.5 million closing consummated on October 19, 2026.

For details, click here →How to read a 424B3 →

Key details

Initial Notes aggregate principal amount$9.4M
Second Close Notes aggregate principal amount$5.6M
Initial Closing aggregate purchase amount$8.5M
Maximum common shares offered under prospectus$50.0M
IssuerRubico Inc.
PurchaserInstitutional Investor

How RUBI stock reacted

Close before

$4.45

Oct 20, 2026

First close after

+0.67%

$4.47

5 trading days

-14.68%

$3.79

Since filing

-78.28%

$0.97

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Frequently asked questions

What did RUBI file with the SEC on Oct 21, 2026?

RUBI filed a 424B3 (Material agreement). Rubico Inc. entered into a Securities Purchase Agreement with an institutional investor to issue up to $15 million in Senior Convertible Notes and warrants, with the initial $8.5 million closing consummated on October 19, 2026.

What does a material agreement mean for RUBI stock?

A contract important enough that investors need to know about it — a big customer contract, a loan, a merger agreement or a partnership.

How do I read a 424B3?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B3 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did RUBI stock react to this filing?

RUBI closed at $4.45 before the filing and $4.47 on Oct 21, 2026 (+0.67%). Five trading days later: $3.79 (-14.68%).

Other RUBI SEC filings

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