INNOSPEC INC (IOSP) Institutional Ownership Changes & 13F Activity

INNOSPEC INC (IOSP) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Renaissance Technologies LLCSell-1,400118,900$8,682,078
Q4 2025Renaissance Technologies LLCSell-26,200120,300$9,207,762
Q3 2025Renaissance Technologies LLCSell-100146,500$11,303,940
Q2 2025Renaissance Technologies LLCBuy19,700146,600$12,327,594
Q1 2025Renaissance Technologies LLCBuy122,100126,900$12,023,775
Q4 2024Renaissance Technologies LLCSell-4004,800$528,288
Q3 2024Renaissance Technologies LLCSell-4,0005,200$588,068
Q2 2024Renaissance Technologies LLCBuy6,6009,200$1,137,028
Q4 2023Renaissance Technologies LLCSell-28,2002,600$320
Q2 2023Renaissance Technologies LLCSell-3,56230,800$3,094
Q1 2023Renaissance Technologies LLCBuy16,36234,362$3,528
Q4 2022Renaissance Technologies LLCSell-12,90018,000$1,851
Q3 2022Renaissance Technologies LLCBuy4,40030,900$2,647
Q2 2022Renaissance Technologies LLCBuy4,20026,500$2,538
Q3 2021Renaissance Technologies LLCSell-18,70022,300$1,878
Q2 2021Renaissance Technologies LLCSell-21,00041,000$3,715
Q3 2020Renaissance Technologies LLCBuy57,80062,000$3,926
Q2 2020Renaissance Technologies LLCSell-12,1004,200$324
Q1 2020Renaissance Technologies LLCSell-70016,300$1,133
Q4 2019Renaissance Technologies LLCSell-10,80017,000$1,758
Q3 2019Renaissance Technologies LLCBuy23,60027,800$2,478
Q2 2019Renaissance Technologies LLCSell-26,9004,200$383
Q4 2018Renaissance Technologies LLCBuy25,20031,100$1,921
Q3 2018Renaissance Technologies LLCSell-67,1005,900$453
Q3 2017Renaissance Technologies LLCSell-21,00073,000$4,500
Q2 2017Renaissance Technologies LLCSell-154,10094,000$6,162
Q1 2017Renaissance Technologies LLCBuy151,700248,100$16,064
Q4 2016Renaissance Technologies LLCSell-44,40096,400$6,603
Q3 2016Renaissance Technologies LLCSell-18,300140,800$8,562
Q2 2016Renaissance Technologies LLCSell-119,300159,100$7,317

Frequently asked questions about IOSP activity

  • Which institutional owners are buying IOSP?

    Institutional owners buying IOSP include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in IOSP activity?

    "Buy" means an investor increased their reported position in IOSP compared to the prior reporting period. This reflects growing exposure to INNOSPEC INC (IOSP) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in IOSP increasing?

    Institutional interest in IOSP can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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