Innospec Inc.
US ˙ NasdaqGS ˙ US45768S1050

SecurityIOSP / Innospec Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership103,702 shares
Latest Disclosed Value $ 7,937,617
Sei Investments Co reports 55.89% increase in ownership of IOSP / Innospec Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 103,702 shares of Innospec Inc. (US:IOSP) valued at $7,937,351 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 66,521 shares of Innospec Inc.. This represents a change in shares of 55.89% during the quarter. The current value of the position is $8,358,381 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)
2026-02-13 2025-12-31 13F INNOSPEC COM 45768S105 103,702 37,181 55.89 7,938 54.66 0.0078
2025-11-13 2025-09-30 13F INNOSPEC COM 45768S105 66,521 11,049 19.92 5,133 10.03 0.0055
2025-08-14 2025-06-30 13F INNOSPEC COM 45768S105 55,472 6,871 14.14 4,665 1.30 0.0054
2025-05-14 2025-03-31 13F/A-1 INNOSPEC COM 45768S105 48,601 -90,572 -65.08 4,605 -69.94 0.0059
2025-05-13 2025-03-31 13F INNOSPEC COM 45768S105 138,987 -186 15,261 0.0166
2025-02-11 2024-12-31 13F INNOSPEC COM 45768S105 139,173 -5,606 -3.87 15,317 -6.45 0.0197
2024-11-12 2024-09-30 13F INNOSPEC COM 45768S105 144,779 7,685 5.61 16,373 -3.36 0.0213
2024-08-13 2024-06-30 13F INNOSPEC COM 45768S105 137,094 -1,694 -1.22 16,943 -5.32 0.0240
2024-05-07 2024-03-31 13F INNOSPEC COM 45768S105 138,788 6,532 4.94 17,895 9.79 0.0262
2024-02-14 2023-12-31 13F INNOSPEC COM 45768S105 132,256 3,750 2.92 16,299 24.11 0.0262
2023-11-14 2023-09-30 13F INNOSPEC COM 45768S105 128,506 10,268 8.68 13,133 10.59 0.0236
2023-08-11 2023-06-30 13F INNOSPEC COM 45768S105 118,238 -14,506 -10.93 11,875 -12.86 0.0207
2023-05-12 2023-03-31 13F INNOSPEC COM 45768S105 132,744 54,297 69.21 13,629 68.91 0.0253
2023-02-10 2022-12-31 13F INNOSPEC COM 45768S105 78,447 3,231 4.30 8,069 25.22 0.0179
2022-11-14 2022-09-30 13F INNOSPEC COM 45768S105 75,216 17,292 29.85 6,443 16.34 0.0144
2022-08-15 2022-06-30 13F INNOSPEC COM 45768S105 57,924 53,378 1,174.18 5,538 1,240.92 0.0120
2022-05-13 2022-03-31 13F INNOSPEC COM 45768S105 4,546 55 1.22 413 1.98 0.0008
2022-02-14 2021-12-31 13F INNOSPEC COM 45768S105 4,491 4,491 405 0.0008
2020-12-04 2020-09-30 13F/A-1 INNOSPEC COM 45768S105 0 -4,825 -100.00 0 -100.00
2020-08-17 2020-06-30 13F/A-1 INNOSPEC COM 45768S105 4,825 -83 -1.69 372 9.09 0.0012
2020-08-11 2020-06-30 13F INNOSPEC COM 45768S105 4,825 -83 372 1,009.0698
2020-05-14 2020-03-31 13F INNOSPEC COM 45768S105 4,908 -180 -3.54 341 -35.17 0.0013
2020-02-06 2019-12-31 13F INNOSPEC COM 45768S105 5,088 -58 -1.13 526 14.60 0.0016
2019-11-12 2019-09-30 13F INNOSPEC COM 45768S105 5,146 219 4.44 459 2.00 0.0012
2019-08-14 2019-06-30 13F INNOSPEC COM 45768S105 4,927 -3,447 -41.16 450 -35.53 0.0015
2019-05-15 2019-03-31 13F INNOSPEC COM 45768S105 8,374 4,439 112.81 698 131.13 0.0023
2019-02-13 2018-12-31 13F INNOSPEC COM 45768S105 3,935 0 0.00 302 0.00 0.0011
2018-11-08 2018-09-30 13F INNOSPEC COM 45768S105 3,935 -19,348 -83.10 302 -83.05 0.0011
2018-08-03 2018-06-30 13F INNOSPEC COM 45768S105 23,283 -15,295 -39.65 1,782 -32.68 0.0061
2018-05-11 2018-03-31 13F INNOSPEC COM 45768S105 38,578 -4,509 -10.46 2,647 -12.98 0.0101
2018-02-08 2017-12-31 13F INNOSPEC COM 45768S105 43,087 -3,777 -8.06 3,042 5.26 0.0106
2017-11-06 2017-09-30 13F INNOSPEC COM 45768S105 46,864 10,037 27.25 2,890 19.72 0.0103
2017-07-31 2017-06-30 13F INNOSPEC COM 45768S105 36,827 18,420 100.07 2,414 102.52 0.0096
2017-05-05 2017-03-31 13F INNOSPEC COM 45768S105 18,407 479 2.67 1,192 -2.93 0.0052
2017-02-02 2016-12-31 13F INNOSPEC COM 45768S105 17,928 12,262 216.41 1,228 255.94 0.0059
2016-11-04 2016-09-30 13F INNOSPEC COM 45768S105 5,666 -89 -1.55 345 30.19 0.0018
2016-08-11 2016-06-30 13F INNOSPEC COM 45768S105 5,755 -1,136 -16.49 265 -11.37 0.0016
2016-05-10 2016-03-31 13F/A-1 INNOSPEC COM 45768S105 6,891 524 8.23 299 -13.58 0.0019
2016-02-03 2015-12-31 13F INNOSPEC COM 45768S105 6,367 -3,246 -33.77 346 -22.77 0.0021
2015-11-02 2015-09-30 13F/A-1 INNOSPEC COM 45768S105 9,613 -869 -8.29 448 -5.08 0.0041
2015-10-30 2015-09-30 13F DIREXION SHS ETF TR COM 45768S105 9,613 448
2015-08-07 2015-06-30 13F/A-1 INNOSPEC COM 45768S105 10,482 10,482 472 0.0043
2015-08-04 2015-06-30 13F INNOSPEC COM 45768S105 10,482 10,482 472 0.0043
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.