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MX 424B3: Shelf registration

Magnachip Semiconductor

Filed with the SEC on · accession 0001193125-26-420750

MX filed a 424B3 (prospectus (offering)) with the SEC on Oct 14, 2026. Magnachip Semiconductor filed a 424B3 prospectus to register the resale of up to 1,461,988 shares of common stock by a selling stockholder, which were issued in a private placement pursuant to a September 18, 2026 share purchase agreement. The stock moved -6.0% by the first close after the filing.

Summary of the filing

Magnachip Semiconductor filed a 424B3 prospectus to register the resale of up to 1,461,988 shares of common stock by a selling stockholder, which were issued in a private placement pursuant to a September 18, 2026 share purchase agreement. The company will not receive any proceeds from the resale.

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

Key details

Shares of common stock registered for resaleshares 1.5M
Closing price per share on October 12, 2026$3
IssuerMagnachip Semiconductor Corporation
Selling shareholderSelling Stockholder

How MX stock reacted

Close before

$2.84

Oct 13, 2026

First close after

-5.99%

$2.67

5 trading days

-9.15%

$2.58

Since filing

-27.82%

$2.05

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Frequently asked questions

What did MX file with the SEC on Oct 14, 2026?

MX filed a 424B3 (Shelf registration). Magnachip Semiconductor filed a 424B3 prospectus to register the resale of up to 1,461,988 shares of common stock by a selling stockholder, which were issued in a private placement pursuant to a September 18, 2026 share purchase agreement. The company will not receive any proceeds from the resale.

What does a shelf registration mean for MX stock?

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

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 MX stock react to this filing?

MX closed at $2.84 before the filing and $2.67 on Oct 14, 2026 (-5.99%). Five trading days later: $2.58 (-9.15%).

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