Rambus RMBS Institutional Ownership

Updated Oct 24, 2026

Rambus Inc (NASDAQ:RMBS) appeared in the 13F filings of 618 institutional investors for the quarter ended June 30, 2026.

• Together they owned 92.57% of the outstanding stock in Q2 2026, down from 94.69% a quarter earlier.
• Total shares held in Rambus fell 1.94% versus Q1 2026, while the number of holders rose 35.53% versus Q2 2025.
• Among the 618 holders of Rambus, 326 added to their positions, 228 reduced their stakes and 64 left their positions unchanged.
• In total, institutional investors held 100.4Mn shares of Rambus at the end of Q2 2026, down 1.99Mn from the prior quarter and up 4.52Mn from a year earlier.
• As of June 30, 2026, the biggest holder of Rambus was BlackRock, Inc. with 13.96Mn shares, or 12.88% of shares outstanding.
• Among holders that already owned Rambus, the biggest buyers in Q2 2026 were FMR LLC (+7.14Mn shares), D. E. Shaw & Co., Inc. (+726.9K shares), Manufacturers Life Insurance Company, The (+694.79K shares), Susquehanna International Group, LLP (+470.11K shares) and Citadel Advisors LLC (+383.66K shares).
• Holders that trimmed the most shares of Rambus in Q2 2026 while keeping a position were BlackRock, Inc. (-2.34Mn shares), EdgePoint Investment Group Inc. (-861.53K shares), Geode Capital Management, LLC (-826.84K shares), Voya Investment Management LLC (-666.02K shares) and Ameriprise Financial Inc (-654.01K shares).
• Business Quant data shows the 10 biggest positions in Rambus as of Q2 2026 were held by BlackRock, Inc. (13.96Mn shares), FMR LLC (10.46Mn shares), Invesco Ltd. (6.63Mn shares), Vanguard Portfolio Management LLC (6.07Mn shares), Vanguard Capital Management LLC (4.87Mn shares), State Street Corp (3.92Mn shares), T. Rowe Price Associates Inc (3.33Mn shares), Geode Capital Management, LLC (2.3Mn shares), JPMorgan Chase & Co (2.1Mn shares) and Dimensional Fund Advisors LP (1.72Mn shares).