Olin Corporation
US ˙ NYSE ˙ US6806652052

SecurityOLN / Olin Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership72,858 shares
Latest Disclosed Value $ 1,517,573
Sei Investments Co reports 110.12% increase in ownership of OLN / Olin Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 72,858 shares of Olin Corporation (US:OLN) valued at $1,517,632 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 34,674 shares of Olin Corporation. This represents a change in shares of 110.12% during the quarter. The current value of the position is $1,876,822 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 OLIN COM PAR $1 680665205 72,858 38,184 110.12 1,518 75.17 0.0015
2025-11-13 2025-09-30 13F OLIN COM PAR $1 680665205 34,674 -1,976 -5.39 866 17.66 0.0009
2025-08-14 2025-06-30 13F OLIN COM PAR $1 680665205 36,650 5,483 17.59 736 -2.52 0.0009
2025-05-14 2025-03-31 13F/A-1 OLIN COM PAR $1 680665205 31,167 19,238 161.27 755 87.34 0.0010
2025-05-13 2025-03-31 13F OLIN COM PAR $1 680665205 12,032 103 364 0.0004
2025-02-11 2024-12-31 13F OLIN COM PAR $1 680665205 11,929 -5,059 -29.78 403 -50.55 0.0005
2024-11-12 2024-09-30 13F OLIN COM PAR $1 680665205 16,988 4,827 39.69 815 42.23 0.0011
2024-08-13 2024-06-30 13F OLIN COM PAR $1 680665205 12,161 640 5.56 573 -15.36 0.0008
2024-05-07 2024-03-31 13F OLIN COM PAR $1 680665205 11,521 -1,044 -8.31 677 0.00 0.0010
2024-02-14 2023-12-31 13F OLIN COM PAR $1 680665205 12,565 -24,025 -65.66 678 -62.96 0.0011
2023-11-14 2023-09-30 13F OLIN COM PAR $1 680665205 36,590 -22,816 -38.41 1,829 -40.10 0.0033
2023-08-11 2023-06-30 13F OLIN COM PAR $1 680665205 59,406 -1,252 -2.06 3,053 -9.33 0.0053
2023-05-12 2023-03-31 13F OLIN COM PAR $1 680665205 60,658 19,451 47.20 3,367 54.33 0.0063
2023-02-10 2022-12-31 13F OLIN COM PAR $1 680665205 41,207 -1,008 -2.39 2,182 20.50 0.0048
2022-11-14 2022-09-30 13F OLIN COM PAR $1 680665205 42,215 -88,663 -67.74 1,810 -69.90 0.0040
2022-08-15 2022-06-30 13F OLIN COM PAR $1 680665205 130,878 6,639 5.34 6,013 -7.49 0.0130
2022-05-13 2022-03-31 13F OLIN COM PAR $1 680665205 124,239 27,877 28.93 6,500 17.18 0.0131
2022-02-14 2021-12-31 13F OLIN COM PAR $1 680665205 96,362 192 0.20 5,547 19.16 0.0104
2021-11-12 2021-09-30 13F OLIN COM PAR $1 680665205 96,170 2,808 3.01 4,655 7.04 0.0098
2021-08-06 2021-06-30 13F OLIN COM PAR $1 680665205 93,362 28,590 44.14 4,349 82.65 0.0096
2021-05-12 2021-03-31 13F OLIN COM PAR $1 680665205 64,772 -4,503 -6.50 2,381 39.73 0.0060
2021-02-08 2020-12-31 13F OLIN COM PAR $1 680665205 69,275 -31,844 -31.49 1,704 38.42 0.0044
2020-12-04 2020-09-30 13F/A-1 OLIN COM PAR $1 680665205 101,119 80,636 393.67 1,231 491.83 0.0036
2020-11-06 2020-09-30 13F OLIN COM PAR $1 680665205 103,173 82,690 1,256 3,024.1687
2020-08-17 2020-06-30 13F/A-1 OLIN COM PAR $1 680665205 20,483 -2,399 -10.48 208 -12.97 0.0006
2020-08-11 2020-06-30 13F OLIN COM PAR $1 680665205 22,373 -509 307 832.7538
2020-05-14 2020-03-31 13F OLIN COM PAR $1 680665205 22,882 994 4.54 239 -37.43 0.0009
2020-02-06 2019-12-31 13F OLIN COM PAR $1 680665205 21,888 -289 -1.30 382 -10.12 0.0011
2019-11-12 2019-09-30 13F OLIN COM PAR $1 680665205 22,177 -168 -0.75 425 -19.05 0.0011
2019-08-14 2019-06-30 13F OLIN COM PAR $1 680665205 22,345 3,097 16.09 525 11.23 0.0017
2019-05-15 2019-03-31 13F OLIN COM PAR $1 680665205 19,248 -48,613 -71.64 472 -72.48 0.0016
2019-02-13 2018-12-31 13F OLIN COM PAR $1 680665205 67,861 3,451 5.36 1,715 3.19 0.0061
2018-11-08 2018-09-30 13F OLIN COM PAR $1 680665205 64,410 -275,583 -81.06 1,662 -82.98 0.0060
2018-08-03 2018-06-30 13F OLIN COM PAR $1 680665205 339,993 -32,896 -8.82 9,765 -13.83 0.0332
2018-05-11 2018-03-31 13F OLIN COM PAR $1 680665205 372,889 52,031 16.22 11,332 -0.74 0.0434
2018-02-08 2017-12-31 13F OLIN COM PAR $1 680665205 320,858 55,546 20.94 11,416 25.63 0.0396
2017-11-06 2017-09-30 13F OLIN COM PAR $1 680665205 265,312 17,354 7.00 9,087 21.05 0.0323
2017-07-31 2017-06-30 13F OLIN COM PAR $1 680665205 247,958 58,614 30.96 7,507 20.61 0.0299
2017-05-05 2017-03-31 13F OLIN COM PAR $1 680665205 189,344 -44,305 -18.96 6,224 4.03 0.0273
2017-02-02 2016-12-31 13F OLIN COM PAR $1 680665205 233,649 62,885 36.83 5,983 70.75 0.0290
2016-11-04 2016-09-30 13F OLIN COM PAR $1 680665205 170,764 -21,803 -11.32 3,504 -26.74 0.0178
2016-08-11 2016-06-30 13F OLIN COM PAR $1 680665205 192,567 191,341 15,606.93 4,783 22,676.19 0.0287
2016-05-10 2016-03-31 13F/A-1 OLIN COM PAR $1 680665205 1,226 594 93.99 21 90.91 0.0001
2016-02-03 2015-12-31 13F OLIN COM PAR $1 680665205 632 -19,464 -96.86 11 -96.74 0.0001
2015-11-02 2015-09-30 13F/A-1 OLIN COM PAR $1 680665205 20,096 20,092 502,300.00 337 0.0031
2015-10-30 2015-09-30 13F OLIN COM PAR $1 680665205 20,096 340
2015-08-07 2015-06-30 13F/A-1 OLIN COM PAR $1 680665205 4 0 0.00 0 0.0000
2015-08-04 2015-06-30 13F OLIN COM PAR $1 680665205 4 0 0 0.0000
2015-05-14 2015-03-31 13F/A-1 OLIN COM PAR $1 680665205 4 0 0.00 0 0.0000
2015-05-01 2015-03-31 13F OLD REP INTL NOTE 3.750% 3/1 680665205 4 0
2015-02-10 2014-12-31 13F OLIN COM PAR $1 680665205 4 4 0 0.0000
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.