Laura G. O'Shaughnessy filed an amended Schedule 13D with the Securities and Exchange Commission on November 2, 2026, disclosing her beneficial ownership of Class B Common Stock in Graham Holdings Company, a Delaware-incorporated media and education conglomerate headquartered in Arlington, Virginia.

Key Highlights

  • Aggregate beneficial ownership: O'Shaughnessy reported 434,689 shares of Class B Common Stock as of November 2, 2026.
  • Percentage of class: The reported holdings constitute approximately 12.0% of Class B Common Stock outstanding, according to the filing.
  • Share base used: The percentage was calculated on 3,616,609 shares, comprising 3,204,785 shares outstanding as of October 23, 2026, plus 411,824 shares issuable upon conversion of Class A Common Stock.
  • Voting structure: O'Shaughnessy reported sole voting power over 200,197 shares and shared voting power over 234,492 shares, with sole dispositive power over zero shares and shared dispositive power over 42,787 shares.
  • Triggering event: The amendment was filed in part to reflect a change in outstanding shares reported by Graham Holdings in its Quarterly Report filed October 29, 2026, as well as certain earlier transactions by the reporting person.
  • Excluded shares: The aggregate in Row 11 does not include 58,167 Class B shares that O'Shaughnessy's spouse has the right to purchase under stock options, nor 13 Class B shares held by her spouse.

O'Shaughnessy's Ownership Structure Across Graham Holdings Share Classes

According to the filing, O'Shaughnessy's 434,689 aggregate beneficial ownership figure spans both Class A and Class B Common Stock of Graham Holdings Company, which operates in media, education, and other business segments and is headquartered at 1812 North Moore Street, Suite 2100, Arlington, Virginia. Class A Common Stock is convertible share for share into Class B Common Stock, which shaped how the filing calculated the ownership percentage.

The filing itemizes four distinct holdings. First, 191,705 shares of Class A Common Stock are held in trusts for the benefit of O'Shaughnessy and her siblings, over which she holds shared voting power through a revocable proxy granted by Daniel L. Mosley as trustee. Second, 200,197 shares of Class A Common Stock are held in trusts for the benefit of her father, over which she holds sole voting power via a revocable proxy granted by her father and Mr. Mosley as trustees. Third, 19,922 shares of Class A Common Stock are held directly by O'Shaughnessy, with shared voting and investment power with her spouse. Fourth, 22,865 shares of Class B Common Stock are held jointly with her spouse, also with shared voting and investment power.

The filing notes that this statement amends and supplements the original Schedule 13D filed by O'Shaughnessy dated September 5, 2024. The document was signed by Nicole M. Maddrey, identified as Attorney-in-Fact for Laura G. O'Shaughnessy, on November 2, 2026. The source of funds is listed as "OO," the code for funds from sources other than personal funds or borrowed funds, as designated in the filing.

What Was Disclosed

This amended Schedule 13D discloses that Laura G. O'Shaughnessy beneficially owned 434,689 shares, or approximately 12.0%, of Graham Holdings Company's Class B Common Stock as of November 2, 2026, distributed across multiple trust and direct-holding arrangements involving both Class A and Class B shares.