Vanguard Portfolio Management Reduces Stake in Entegris Inc Below 5%

Executive Summary

On October 30, 2026, Vanguard Portfolio Management LLC filed an amended Schedule 13G (Amendment No. 1) with the SEC regarding its holdings in Entegris Inc ($ENTG). As of the event date of September 30, 2026, the reporting entity disclosed ownership of 7,617,615 shares of Common Stock, representing 4.98% of the outstanding class. This marks a reduction below the 5% beneficial ownership reporting threshold, triggering Item 5 disclosure.

Key Holdings & Voting Power Details

• Issuer: Entegris Inc (CIK: 0001101302)
• Reporting Entity: Vanguard Portfolio Management LLC (CIK: 0002100121)
• Class of Security: Common Stock (CUSIP: 29362U104)
• Aggregate Beneficial Ownership: 7,617,615 shares
• Percent of Class: 4.98%
• Voting Authority:
  • Sole Voting Power: 24,630 shares
  • Shared Voting Power: 0 shares
• Dispositive Authority:
  • Sole Dispositive Power: 7,617,615 shares
  • Shared Dispositive Power: 0 shares

Strategic & Market Implications

Because the stake has declined to 4.98% (below the 5% threshold), Vanguard Portfolio Management is no longer classified as a 5% beneficial owner under Section 13(d)/13(g) of the Securities Exchange Act of 1934. The filing was executed under Rule 13d-1(b) as a registered investment adviser holding shares in the ordinary course of business without activist intent.