Westchester Capital Management, LLC and Westchester Capital Partners, LLC filed an amended Schedule 13G with the SEC on November 13, 2026, disclosing their combined beneficial ownership of Class A ordinary shares in GigCapital8 Corp as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: Westchester Capital Management, LLC reported 1,265,232 Class A ordinary shares, representing 4.93% of GigCapital8 Corp's outstanding shares.
  • Secondary filer: Westchester Capital Partners, LLC reported 11,768 Class A ordinary shares, representing 0.05% of the class.
  • Voting power split: Westchester Capital Management holds sole voting power over 93,467 shares and shared voting power over 1,171,765 shares.
  • Share count basis: Percentages are based on 25,657,625 shares outstanding as of August 5, 2026, as reported in GigCapital8 Corp's quarterly report filed that same date.
  • Event date: The filing event triggering this amended statement was September 30, 2026.
  • Registered investment advisers: Both reporting persons are classified as investment advisers (type "IA") organized under Delaware law, with offices at 100 Summit Lake Drive, Valhalla, NY 10595.

Westchester Capital's Position in GigCapital8 Corp

According to the amended Schedule 13G filed November 13, 2026, Westchester Capital Management, LLC serves as sub-advisor to a group of funds including The Merger Fund, The Merger Fund VL, Virtus Westchester Event-Driven Fund, Virtus Westchester Credit Event Fund, JNL/Westchester Capital Event Driven Fund, JNL Multi-Manager Alternative Fund, and Principal Funds, Inc. - Global Multi-Strategy Fund. These funds directly hold Class A ordinary shares of GigCapital8 Corp, a blank-check company incorporated with Class A ordinary shares carrying a par value of $0.0001 per share and CUSIP number G3864J100. GigCapital8 Corp's principal executive offices are listed in the filing as 1731 Embarcadero Rd., Suite 200, Palo Alto, CA 94303.

Westchester Capital Partners, LLC, also a registered investment adviser, serves as investment adviser to the Westchester Capital Master Trust, which also holds shares of the company. The filing states that Westchester Capital Management and Westchester Capital Partners "often make acquisitions in, and dispose of, securities of an issuer on the same terms and conditions and at the same time," and that the parties "may be deemed to constitute a 'group' for purposes of Section 13(g)(3) of the Act." The filing adds that it "shall not be construed as an admission that the Reporting Persons are a group, or have agreed to act as a group." Roy Behren and Michael T. Shannon each serve as Co-Presidents of Westchester Capital Management, according to the filing.

The filing certifies that the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer." Item 5 of the filing designates this as an ownership of 5 percent or less of a class, consistent with the 4.93% figure reported for Westchester Capital Management.

What Was Disclosed

Westchester Capital Management, LLC and Westchester Capital Partners, LLC jointly filed an amended Schedule 13G disclosing combined beneficial ownership of Class A ordinary shares in GigCapital8 Corp, with the larger entity holding a 4.93% stake as of September 30, 2026.