Xencor Inc has announced an update regarding its major shareholder, PRIMECAP Management Co, which has increased its stake in the company to 13.29%. This change is significant as it reflects growing confidence in Xencor's business prospects and may influence the company's future direction.

Background

Xencor Inc, based in Pasadena, California, operates in the pharmaceutical preparations sector (SIC 2834). The company is publicly traded on the Nasdaq under the ticker XNCR. As an accelerated filer, Xencor is subject to specific regulatory requirements, which include regular financial disclosures to the SEC.

What the Filing Says

According to the recent filing dated November 6, 2026, PRIMECAP Management Co now beneficially owns 9,879,855 shares of Xencor, representing 13.29% of the company's total shares. The filing indicates that PRIMECAP has sole voting and dispositive power over these shares.

Impact

This increase in shareholding by PRIMECAP Management Co may affect various stakeholders, including existing shareholders, potential investors, and industry analysts. The heightened ownership could lead to increased scrutiny of Xencor's strategic decisions and operational performance.

What's Next

The filing does not say what happens next.

Shareholder Details

PRIMECAP Management Co, a registered investment advisor, has a significant influence on Xencor Inc due to its ownership stake. The filing indicates that PRIMECAP has sole voting and dispositive power over 9,879,855 shares, which constitutes 13.29% of the total shares outstanding. This ownership structure suggests a strong commitment to the company's long-term performance.

Other Beneficial Owners

The filing also notes that various persons have the right to receive or direct the receipt of dividends or proceeds from the sale of the securities. Notably, the PRIMECAP Odyssey Aggressive Growth Fund is mentioned as having an interest of more than five percent of Xencor's total outstanding common stock, indicating that the fund is a significant player in Xencor's shareholder landscape.

Regulatory Compliance

This Schedule 13G/A filing is an amendment to a previous filing and is required under the Securities Exchange Act of 1934. It reflects ongoing compliance with SEC regulations, ensuring transparency regarding significant shareholders and their influence on the company.

Filing Details

This filing was made on November 6, 2026, and is classified under the SEC file number 005-87750. It is important to note that the filing does not include any information on future plans or strategies that PRIMECAP Management Co may have regarding its investment in Xencor.