Brown Advisory Inc and affiliated entities filed Amendment No. 3 to Schedule 13G with the SEC on November 13, 2026, disclosing beneficial ownership of 3,791,899 shares of Oceaneering International Inc common stock as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: Brown Advisory Inc reported 3,791,899 shares, representing 3.81% of Oceaneering International Inc's common stock.
  • Triggering date: The event requiring filing occurred on September 30, 2026.
  • Voting power: Brown Advisory Inc holds sole voting power over 3,434,055 shares and no shared voting power.
  • Dispositive power: Brown Advisory Inc holds shared dispositive power over 3,789,349 shares and no sole dispositive power.
  • Three subsidiaries covered: The filing names Brown Investment Advisory and Trust Co (bank), Brown Advisory LLC (investment adviser), and Signature Financial Management, Inc. (investment adviser) as the relevant subsidiaries.
  • Ownership threshold: The filing was made under Item 5, confirming ownership of 5 percent or less of the class.

Brown Advisory's Reported Position in Oceaneering International

According to the Schedule 13G filing, Brown Advisory Inc, a Maryland-based parent holding company, submitted Amendment No. 3 disclosing its consolidated beneficial ownership in Oceaneering International Inc (NYSE:OII) common stock (CUSIP 675232102). The aggregate amount beneficially owned across all reporting persons is 3,791,899 shares, equating to 3.81% of the class, as of the September 30, 2026 event date.

The filing identifies three subsidiaries through which the position is held. Brown Advisory LLC, classified as an investment adviser, accounts for 3,758,246 shares of aggregate beneficial ownership and holds sole voting power over 3,400,716 shares with shared dispositive power over 3,758,246 shares. Brown Investment Advisory and Trust Co, classified as a bank, reports 31,067 shares of aggregate beneficial ownership with sole voting power over 31,067 shares. Signature Financial Management, Inc., a Virginia-incorporated investment adviser, reports 2,586 shares of aggregate beneficial ownership with sole voting power over 2,272 shares.

The filing states that "the total securities being reported are beneficially owned by investment companies and other managed accounts of direct/indirect subsidiaries of Brown Advisory Inc" and that subsidiaries "may be deemed to be beneficial owners of the reported securities because applicable investment advisory contracts provide voting and/or investment power over securities." All four entities certified 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." The filing was signed by Victor Fernandez, Chief Compliance Officer, on behalf of all four reporting persons.

What Was Disclosed

Brown Advisory Inc and three subsidiaries filed Amendment No. 3 to Schedule 13G reporting combined beneficial ownership of 3,791,899 shares, or 3.81%, of Oceaneering International Inc common stock as of September 30, 2026, held through investment advisory and banking subsidiaries.