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RUBI 424B5: Secondary offering

Filed with the SEC on · accession 0001171843-26-006687

RUBI filed a 424B5 (prospectus (offering)) with the SEC on Oct 19, 2026. The final terms of an offering of shares or bonds. The stock moved -45.3% by the first close after the filing.

Summary of the filing

Rubico Inc. is raising up to $15 million through a private placement of senior convertible notes and warrants to an institutional investor, structured in two tranches with an initial $8.5 million closing.

For details, click here →How to read a 424B5 →

Key details

Total offering principal amount of senior convertible notes$15.0M
First tranche gross proceeds$8.5M
Second tranche gross proceeds$5.0M
First tranche notes principal amount$9.4M
Second tranche notes principal amount$5.6M
IssuerRubico Inc.
Purchaserinstitutional investor

How RUBI stock reacted

Close before

$9.78

Oct 16, 2026

First close after

-45.32%

$5.34

5 trading days

-56.52%

$4.25

Since filing

-90.12%

$0.97

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Frequently asked questions

What did RUBI file with the SEC on Oct 19, 2026?

RUBI filed a 424B5 (Secondary offering). Rubico Inc. is raising up to $15 million through a private placement of senior convertible notes and warrants to an institutional investor, structured in two tranches with an initial $8.5 million closing.

What does a secondary offering mean for RUBI stock?

New shares dilute existing holders and are often sold at a discount to the market price.

How do I read a 424B5?

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 424B5 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did RUBI stock react to this filing?

RUBI closed at $9.78 before the filing and $5.34 on Oct 19, 2026 (-45.32%). Five trading days later: $4.25 (-56.52%).

Other RUBI SEC filings

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