Innospec Inc.
US ˙ NasdaqGS ˙ US45768S1050

SecurityIOSP / Innospec Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership23,792 shares
Latest Disclosed Value $ 1,737,292
Citigroup Inc reports 34.32% increase in ownership of IOSP / Innospec Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 23,792 shares of Innospec Inc. (US:IOSP) valued at $1,737,292 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 17,713 shares of Innospec Inc.. This represents a change in shares of 34.32% during the quarter. The current value of the position is $1,920,966 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F INNOSPEC COM 45768S105 23,792 6,079 34.32 1,737 28.19 0.0004
2026-02-13 2025-12-31 13F INNOSPEC COM 45768S105 17,713 -4,538 -20.39 1,356 -21.04 0.0006
2025-11-10 2025-09-30 13F INNOSPEC COM 45768S105 22,251 -6,040 -21.35 1,717 -27.84 0.0008
2025-08-11 2025-06-30 13F INNOSPEC COM 45768S105 28,291 -13,286 -31.96 2,379 -39.63 0.0012
2025-05-12 2025-03-31 13F INNOSPEC COM 45768S105 41,577 6,400 18.19 3,939 1.76 0.0020
2025-02-12 2024-12-31 13F INNOSPEC COM 45768S105 35,177 2,984 9.27 3,872 6.35 0.0023
2024-11-12 2024-09-30 13F INNOSPEC COM 45768S105 32,193 10,162 46.13 3,641 33.73 0.0021
2024-08-12 2024-06-30 13F INNOSPEC COM 45768S105 22,031 5,031 29.59 2,723 24.24 0.0017
2024-05-10 2024-03-31 13F INNOSPEC COM 45768S105 17,000 1,102 6.93 2,192 11.84 0.0014
2024-02-09 2023-12-31 13F INNOSPEC COM 45768S105 15,898 5,270 49.59 1,959 80.39 0.0014
2023-12-06 2023-09-30 13F/A-1 INNOSPEC COM 45768S105 10,628 -9,284 -46.63 1,086 -45.67 0.0008
2023-11-09 2023-09-30 13F INNOSPEC COM 45768S105 10,628 -9,284 1,086 0.0003
2023-08-10 2023-06-30 13F INNOSPEC COM 45768S105 19,912 8,212 70.19 2,000 66.44 0.0013
2023-05-11 2023-03-31 13F INNOSPEC COM 45768S105 11,700 -3,124 -21.07 1,201 -21.19 0.0008
2023-02-09 2022-12-31 13F INNOSPEC COM 45768S105 14,824 3,068 26.10 1,525 51.34 0.0012
2022-11-10 2022-09-30 13F INNOSPEC COM 45768S105 11,756 833 7.63 1,007 -3.73 0.0007
2022-08-10 2022-06-30 13F INNOSPEC COM 45768S105 10,923 -10,433 -48.85 1,046 -47.06 0.0008
2022-05-12 2022-03-31 13F INNOSPEC COM 45768S105 21,356 2,264 11.86 1,976 14.55 0.0012
2022-02-10 2021-12-31 13F INNOSPEC COM 45768S105 19,092 5,195 37.38 1,725 47.44 0.0009
2021-11-10 2021-09-30 13F INNOSPEC COM 45768S105 13,897 -1,743 -11.14 1,170 -17.43 0.0007
2021-08-10 2021-06-30 13F INNOSPEC COM 45768S105 15,640 12,464 392.44 1,417 334.66 0.0009
2021-05-13 2021-03-31 13F INNOSPEC COM 45768S105 3,176 -3,377 -51.53 326 -45.21 0.0002
2021-02-11 2020-12-31 13F INNOSPEC COM 45768S105 6,553 -6,601 -50.18 595 -28.57 0.0004
2020-11-12 2020-09-30 13F INNOSPEC COM 45768S105 13,154 -18,769 -58.79 833 -66.22 0.0005
2020-08-12 2020-06-30 13F INNOSPEC COM 45768S105 31,923 18,602 139.64 2,466 166.59 0.0019
2020-05-12 2020-03-31 13F INNOSPEC COM 45768S105 13,321 -25,031 -65.27 925 -76.68 0.0008
2020-02-12 2019-12-31 13F INNOSPEC COM 45768S105 38,352 19,577 104.27 3,967 136.98 0.0029
2019-11-08 2019-09-30 13F INNOSPEC COM 45768S105 18,775 7,787 70.87 1,674 66.90 0.0013
2019-08-12 2019-06-30 13F INNOSPEC COM 45768S105 10,988 -4,573 -29.39 1,003 -22.67 0.0008
2019-05-13 2019-03-31 13F INNOSPEC COM 45768S105 15,561 -433 -2.71 1,297 31.28 0.0013
2019-02-12 2018-12-31 13F INNOSPEC COM 45768S105 15,994 10,173 174.76 988 121.03 0.0010
2018-11-13 2018-09-30 13F INNOSPEC COM 45768S105 5,821 -405 -6.50 447 -6.29 0.0004
2018-08-10 2018-06-30 13F INNOSPEC COM 45768S105 6,226 -4,218 -40.39 477 -33.47 0.0004
2018-05-11 2018-03-31 13F INNOSPEC COM 45768S105 10,444 46 0.44 717 -2.32 0.0006
2018-02-12 2017-12-31 13F INNOSPEC COM 45768S105 10,398 -9,564 -47.91 734 -40.33 0.0006
2017-11-13 2017-09-30 13F INNOSPEC COM 45768S105 19,962 -2,522 -11.22 1,230 -16.55 0.0010
2017-08-11 2017-06-30 13F INNOSPEC COM 45768S105 22,484 -1,852 -7.61 1,474 -6.47 0.0013
2017-05-12 2017-03-31 13F INNOSPEC COM 45768S105 24,336 -18,250 -42.85 1,576 -45.97 0.0014
2017-02-10 2016-12-31 13F INNOSPEC COM 45768S105 42,586 22,765 114.85 2,917 141.87 0.0026
2016-11-10 2016-09-30 13F INNOSPEC COM 45768S105 19,821 -282 -1.40 1,206 30.38 0.0011
2016-08-12 2016-06-30 13F INNOSPEC COM 45768S105 20,103 -6,550 -24.58 925 -19.98 0.0009
2016-05-13 2016-03-31 13F INNOSPEC COM 45768S105 26,653 13,085 96.44 1,156 56.85 0.0013
2016-02-12 2015-12-31 13F INNOSPEC COM 45768S105 13,568 1,752 14.83 737 34.00 0.0007
2015-11-13 2015-09-30 13F INNOSPEC COM 45768S105 11,816 6,161 108.95 550 116.54 0.0005
2015-08-13 2015-06-30 13F INNOSPEC COM 45768S105 5,655 -2,285 -28.78 254 -30.98 0.0002
2015-05-14 2015-03-31 13F INNOSPEC COM 45768S105 7,940 777 10.85 368 20.66 0.0004
2015-02-17 2014-12-31 13F INNOSPEC COM 45768S105 7,163 5,329 290.57 305 362.12 0.0003
2014-11-14 2014-09-30 13F INNOSPEC COM 45768S105 1,834 461 33.58 66 11.86 0.0001
2014-08-14 2014-06-30 13F INNOSPEC COM 45768S105 1,373 -3,118 -69.43 59 -70.94 0.0001
2014-05-15 2014-03-31 13F INNOSPEC COM 45768S105 4,491 -5,169 -53.51 203 -54.48 0.0002
2014-02-14 2013-12-31 13F INNOSPEC COM 45768S105 9,660 3,840 65.98 446 64.58 0.0004
2013-11-14 2013-09-30 13F INNOSPEC COM 45768S105 5,820 240 4.30 271 20.44 0.0003
2013-08-14 2013-06-30 13F INNOSPEC COM 45768S105 5,580 5,580 225 0.0002
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.