Innospec Inc.
US ˙ NasdaqGS ˙ US45768S1050

SecurityIOSP / Innospec Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership235,571 shares
Latest Disclosed Value $ 17,201,436
Morgan Stanley reports 3.27% decrease in ownership of IOSP / Innospec Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 235,571 shares of Innospec Inc. (US:IOSP) valued at $17,201,394 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 243,535 shares of Innospec Inc.. This represents a change in shares of -3.27% during the quarter. The current value of the position is $18,998,801 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)
2026-05-15 2026-03-31 13F INNOSPEC COM 45768S105 235,571 -7,964 -3.27 17,201 -7.72 0.0010
2026-05-27 2025-12-31 13F/A-1 INNOSPEC COM 45768S105 243,535 -10,218 -4.03 18,640 -4.80 0.0011
2026-02-13 2025-12-31 13F INNOSPEC COM 45768S105 243,535 -10,218 18,640 0.0011
2026-05-27 2025-09-30 13F/A-1 INNOSPEC COM 45768S105 253,753 -10,082 -3.82 19,580 -11.75 0.0012
2025-11-14 2025-09-30 13F INNOSPEC COM 45768S105 253,753 -10,082 19,580 0.0012
2025-08-15 2025-06-30 13F INNOSPEC COM 45768S105 263,835 24,640 10.30 22,186 -2.11 0.0014
2025-05-15 2025-03-31 13F INNOSPEC COM 45768S105 239,195 1,318 0.55 22,664 -13.43 0.0016
2025-05-15 2024-12-31 13F/A-1 INNOSPEC COM 45768S105 237,877 -16,877 -6.62 26,181 -9.13 0.0018
2025-02-14 2024-12-31 13F INNOSPEC COM 45768S105 237,877 -16,877 26,181 0.0018
2025-05-14 2024-09-30 13F/A-2 INNOSPEC COM 45768S105 254,754 17,277 7.28 28,810 -1.84 0.0021
2025-02-14 2024-09-30 13F/A-1 INNOSPEC COM 45768S105 254,754 17,277 28,810 0.0021
2024-11-14 2024-09-30 13F INNOSPEC COM 45768S105 254,754 17,277 28,810 0.0002
2025-05-14 2024-06-30 13F/A-2 INNOSPEC COM 45768S105 237,477 -77,698 -24.65 29,350 -27.78 0.0023
2024-10-17 2024-06-30 13F/A-1 INNOSPEC COM 45768S105 237,477 -77,698 29,350 0.0023
2024-08-14 2024-06-30 13F INNOSPEC COM 45768S105 237,477 -77,698 29,350 0.0023
2024-10-17 2024-03-31 13F/A-2 INNOSPEC COM 45768S105 315,175 95,769 43.65 40,639 50.29 0.0033
2024-08-16 2024-03-31 13F/A-1 INNOSPEC COM 45768S105 315,175 95,769 40,639 0.0004
2024-05-15 2024-03-31 13F INNOSPEC COM 45768S105 315,175 95,769 40,639 0.0033
2024-08-16 2023-12-31 13F/A-1 INNOSPEC COM 45768S105 219,406 18,305 9.10 27,040 31.56 0.0024
2024-02-13 2023-12-31 13F INNOSPEC COM 45768S105 219,406 18,305 27,040 0.0024
2023-11-15 2023-09-30 13F INNOSPEC COM 45768S105 201,101 -64,007 -24.14 20,553 -22.82 0.0021
2023-08-14 2023-06-30 13F INNOSPEC COM 45768S105 265,108 60,410 29.51 26,628 26.70 0.0026
2023-05-15 2023-03-31 13F INNOSPEC COM 45768S105 204,698 1,421 0.70 21,016 0.51 0.0023
2023-02-14 2022-12-31 13F INNOSPEC COM 45768S105 203,277 -10,445 -4.89 20,909 14.21 0.0024
2022-11-14 2022-09-30 13F INNOSPEC COM 45768S105 213,722 -1,343 -0.62 18,308 -11.13 0.0025
2022-10-27 2022-06-30 13F/A-1 INNOSPEC COM 45768S105 215,065 126,787 143.62 20,602 152.17 0.0027
2022-08-15 2022-06-30 13F INNOSPEC COM 45768S105 215,065 126,787 20,602 0.0027
2022-10-27 2022-03-31 13F/A-1 INNOSPEC COM 45768S105 88,278 -24,723 -21.88 8,170 -19.97 0.0011
2022-05-13 2022-03-31 13F INNOSPEC COM 45768S105 88,278 -24,723 8,170 0.0011
2022-02-14 2021-12-31 13F INNOSPEC COM 45768S105 113,001 -68,282 -37.67 10,209 -33.14 0.0013
2021-11-15 2021-09-30 13F INNOSPEC COM 45768S105 181,283 61,904 51.86 15,269 41.14 0.0021
2021-08-23 2021-06-30 13F/A-1 INNOSPEC COM 45768S105 119,379 57,445 92.75 10,818 70.09 0.0014
2021-08-16 2021-06-30 13F INNOSPEC COM 45768S105 119,379 57,445 10,818 0.0003
2021-05-17 2021-03-31 13F INNOSPEC COM 45768S105 61,934 -17,195 -21.73 6,360 -11.42 0.0009
2021-02-16 2020-12-31 13F INNOSPEC COM 45768S105 79,129 12,118 18.08 7,180 69.18 0.0011
2020-11-13 2020-09-30 13F INNOSPEC COM 45768S105 67,011 -5,940 -8.14 4,244 -24.69 0.0008
2020-08-14 2020-06-30 13F INNOSPEC COM 45768S105 72,951 6,981 10.58 5,635 22.90 0.0012
2020-05-26 2020-03-31 13F/A-1 INNOSPEC COM 45768S105 65,970 -59,586 -47.46 4,585 -64.70 0.0012
2020-05-15 2020-03-31 13F INNOSPEC COM 45768S105 65,970 -59,586 4,585 352.2236
2020-02-14 2019-12-31 13F INNOSPEC COM 45768S105 125,556 36,603 41.15 12,987 63.79 0.0030
2019-11-14 2019-09-30 13F INNOSPEC COM 45768S105 88,953 -27,461 -23.59 7,929 -25.35 0.0021
2019-08-14 2019-06-30 13F INNOSPEC COM 45768S105 116,414 -878 -0.75 10,622 8.65 0.0028
2019-05-15 2019-03-31 13F INNOSPEC COM 45768S105 117,292 8,096 7.41 9,776 44.96 0.0028
2019-02-14 2018-12-31 13F INNOSPEC COM 45768S105 109,196 -49,853 -31.34 6,744 -44.76 0.0020
2019-04-23 2018-09-30 13F/A-2 INNOSPEC COM 45768S105 159,049 51,756 48.24 12,208 48.64 0.0031
2018-11-20 2018-09-30 13F/A-1 INNOSPEC COM 45768S105 159,049 0 12,208 0.0031
2018-11-14 2018-09-30 13F INNOSPEC COM 45768S105 159,049 51,756 12,208
2019-04-23 2018-06-30 13F/A-1 INNOSPEC COM 45768S105 107,293 51,429 92.06 8,213 114.27 0.0022
2018-08-14 2018-06-30 13F INNOSPEC COM 45768S105 107,293 51,429 8,213
2019-04-23 2018-03-31 13F/A-1 INNOSPEC COM 45768S105 55,864 -11,849 -17.50 3,833 -19.83 0.0011
2018-05-14 2018-03-31 13F INNOSPEC COM 45768S105 55,864 -11,849 3,833
2019-04-23 2017-12-31 13F/A-1 INNOSPEC COM 45768S105 67,713 10,382 18.11 4,781 35.25 0.0013
2018-02-14 2017-12-31 13F INNOSPEC COM 45768S105 67,713 10,382 4,781
2017-11-14 2017-09-30 13F INNOSPEC COM 45768S105 57,331 -19,097 -24.99 3,535 -29.43 0.0011
2017-08-11 2017-06-30 13F INNOSPEC COM 45768S105 76,428 -18,168 -19.21 5,009 -18.23 0.0015
2017-05-22 2017-03-31 13F/A-1 INNOSPEC COM 45768S105 94,596 -20,930 -18.12 6,126 -22.59 0.0019
2017-05-12 2017-03-31 13F INNOSPEC COM 45768S105 94,596 6,126
2017-02-22 2016-12-31 13F/A-1 INNOSPEC COM 45768S105 115,526 7,356 6.80 7,914 20.35 0.0026
2017-02-13 2016-12-31 13F INNOSPEC COM 45768S105 115,526 7,914
2016-11-10 2016-09-30 13F INNOSPEC COM 45768S105 108,170 -12,414 -10.29 6,576 18.55 0.0022
2016-08-12 2016-06-30 13F INNOSPEC COM 45768S105 120,584 -15,197 -11.19 5,547 -5.78 0.0020
2016-05-12 2016-03-31 13F INNOSPEC COM 45768S105 135,781 75,487 125.20 5,887 79.76 0.0023
2016-02-09 2015-12-31 13F INNOSPEC COM 45768S105 60,294 -71,134 -54.12 3,275 -46.42 0.0012
2016-02-08 2015-09-30 13F/A-1 INNOSPEC COM 45768S105 131,428 -70,259 -34.84 6,112 -32.72 0.0023
2015-11-09 2015-09-30 13F INNOSPEC COM 45768S105 131,428 6,112
2015-08-12 2015-06-30 13F INNOSPEC COM 45768S105 201,687 -14,189 -6.57 9,084 -9.30 0.0031
2015-05-14 2015-03-31 13F INNOSPEC COM 45768S105 215,876 94,015 77.15 10,015 92.49 0.0037
2015-02-13 2014-12-31 13F INNOSPEC COM 45768S105 121,861 88,098 260.93 5,203 329.29 0.0019
2014-12-16 2014-09-30 13F/A-1 INNOSPEC COM 45768S105 33,763 -31,019 -47.88 1,212 -58.63 0.0005
2014-11-14 2014-09-30 13F INNOSPEC COM 45768S105 33,763 1,212
2014-05-13 2014-03-31 13F INNOSPEC COM 45768S105 64,782 -77,475 -54.46 2,930 -55.44 0.0012
2014-02-13 2013-12-31 13F INNOSPEC COM 45768S105 142,257 -2,440 -1.69 6,575 -2.62 0.0028
2013-11-13 2013-09-30 13F INNOSPEC INC COM COM 45768S105 144,697 5,502 3.95 6,752 20.72 0.0032
2013-08-08 2013-06-30 13F INNOSPEC INC COM COM 45768S105 139,195 139,195 5,593 0.0028
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.