Innospec Inc. (IOSP) Institutional Ownership

Ownership Summary

A total of 9 institutions have reported a stake in Innospec Inc. (NASDAQ:IOSP) as of December 2025, according to recent 13F filings with the SEC.

• The collective stake of institutional investors in Innospec moved to 0.6% in December 2025, a shift down from the 59.8% reported for September 2025.
• Institutional share ownership changed by 68.67% QoQ, while the number of institutional owners saw a decrease of 96.50% YoY.
• The latest 13F cycle for Innospec reveals that of 9 total investors, 5 funds grew their exposure, whereas 2 reduced theirs and 2 made no changes.
• Collectively, institutional investors increased their stake in Innospec to 258.55K shares as of December 2025, a change that is up by 105.27K shares quarter on quarter and down 23.84Mn shares year over year.
• Assenagon Asset Management S.A.'s holding of 178.20K shares as of December 31, 2025 makes it the primary institutional investor in Innospec, owning 0.45% of the stock.
• Among the most significant buyers of Innospec during December 2025 were SG Americas Securities, LLC (56.42K), Assenagon Asset Management S.A. (48.81K), MassMutual Private Wealth & Trust, FSB (120), GAMMA Investing LLC (39), Diversified Trust Co (25).
• Leading sellers of Innospec stock in December 2025 included Versant Capital Management, Inc (112), True Wealth Design, LLC (39).
• The top 9 institutional holders of Innospec for the quarter ending December 2025 included Assenagon Asset Management S.A. (178.20K), SG Americas Securities, LLC (75.81K), Diversified Trust Co (3.82K), Versant Capital Management, Inc (433), MassMutual Private Wealth & Trust, FSB (120), GAMMA Investing LLC (114), True Wealth Design, LLC (38), Abound Wealth Management (2), Rialto Wealth Management, LLC (1).