이노스펙(주)
US ˙ NasdaqGS ˙ US45768S1050

SecurityIOSP / Innospec Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership133,272 shares
Latest Disclosed Value $ 9,732,040
Janus Henderson Group Plc reports 11.65% decrease in ownership of IOSP / Innospec Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 133,272 shares of Innospec Inc. (US:IOSP) valued at $9,731,521 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 150,851 shares of Innospec Inc.. This represents a change in shares of -11.65% during the quarter. The current value of the position is $10,752,385 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)
2026-05-18 2026-03-31 13F/A-1 INNOSPEC COM 45768S105 133,272 -17,579 -11.65 9,732 -15.70 0.0046
2026-05-15 2026-03-31 13F INNOSPEC COM 45768S105 133,272 -17,579 9,732 0.0018
2026-02-17 2025-12-31 13F INNOSPEC COM 45768S105 150,851 -107,256 -41.55 11,546 -42.03 0.0052
2025-11-14 2025-09-30 13F INNOSPEC COM 45768S105 258,107 2,688 1.05 19,915 -7.27 0.0091
2025-08-14 2025-06-30 13F INNOSPEC COM 45768S105 255,419 -219,099 -46.17 21,478 -52.46 0.0105
2025-05-15 2025-03-31 13F INNOSPEC COM 45768S105 474,518 6,580 1.41 45,174 -12.29 0.0248
2025-02-14 2024-12-31 13F INNOSPEC COM 45768S105 467,938 4,527 0.98 51,502 -1.72 0.0262
2024-11-14 2024-09-30 13F INNOSPEC COM 45768S105 463,411 -90,810 -16.39 52,406 -23.49 0.0268
2024-08-14 2024-06-30 13F INNOSPEC COM 45768S105 554,221 -24,737 -4.27 68,496 -8.24 0.0367
2024-05-15 2024-03-31 13F INNOSPEC COM 45768S105 578,958 -2,095 -0.36 74,648 4.24 0.0407
2024-02-14 2023-12-31 13F INNOSPEC COM 45768S105 581,053 916 0.16 71,610 20.78 0.0427
2023-11-14 2023-09-30 13F INNOSPEC COM 45768S105 580,137 -58,476 -9.16 59,289 -7.56 0.0388
2023-08-14 2023-06-30 13F INNOSPEC COM 45768S105 638,613 74,436 13.19 64,141 10.73 0.0399
2023-05-15 2023-03-31 13F INNOSPEC COM 45768S105 564,177 125,785 28.69 57,923 28.46 0.0382
2023-02-14 2022-12-31 13F INNOSPEC COM 45768S105 438,392 -69,176 -13.63 45,093 3.70 0.0322
2023-01-13 2022-09-30 13F/A-1 INNOSPEC COM 45768S105 507,568 -104,777 -17.11 43,483 -25.87 0.0326
2022-11-14 2022-09-30 13F INNOSPEC COM 45768S105 507,568 -104,777 43,483 0.0110
2022-08-15 2022-06-30 13F INNOSPEC COM 45768S105 612,345 -181,994 -22.91 58,657 -20.21 0.0404
2022-05-16 2022-03-31 13F INNOSPEC COM 45768S105 794,339 -114,721 -12.62 73,516 -10.48 0.0355
2022-02-14 2021-12-31 13F INNOSPEC COM 45768S105 909,060 4,761 0.53 82,125 7.83 0.0343
2021-11-16 2021-09-30 13F INNOSPEC COM 45768S105 904,299 76,319 9.22 76,160 1.52 0.0333
2021-08-16 2021-06-30 13F INNOSPEC COM 45768S105 827,980 62,126 8.11 75,023 -4.61 0.0321
2021-05-17 2021-03-31 13F INNOSPEC COM 45768S105 765,854 -40,195 -4.99 78,646 7.54 0.0359
2021-02-16 2020-12-31 13F INNOSPEC COM 45768S105 806,049 52,521 6.97 73,133 53.28 0.0340
2020-11-16 2020-09-30 13F INNOSPEC COM 45768S105 753,528 157,856 26.50 47,713 3.69 0.0249
2020-08-14 2020-06-30 13F INNOSPEC COM 45768S105 595,672 59,994 11.20 46,016 23.62 0.0258
2020-05-14 2020-03-31 13F INNOSPEC COM 45768S105 535,678 13,531 2.59 37,224 -31.08 0.0256
2020-02-18 2019-12-31 13F INNOSPEC COM 45768S105 522,147 0 0.00 54,011 16.04 0.0277
2019-11-14 2019-09-30 13F INNOSPEC COM 45768S105 522,147 101,150 24.03 46,544 21.17 0.0252
2019-07-31 2019-06-30 13F INNOSPEC COM 45768S105 420,997 213,673 103.06 38,412 122.29 0.0209
2019-04-30 2019-03-31 13F INNOSPEC COM 45768S105 207,324 207,324 17,280 0.0096
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.