Steel Dynamics, Inc.
US ˙ NasdaqGS ˙ US8581191009

SecuritySTLD / Steel Dynamics, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership117,731 shares
Latest Disclosed Value $ 19,954,457
Sei Investments Co ownership in STLD / Steel Dynamics, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 117,731 shares of Steel Dynamics, Inc. (US:STLD) valued at $19,949,518 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 111,001 shares of Steel Dynamics, Inc.. This represents a change in shares of 6.06% during the quarter. The current value of the position is $32,391,330 USD.

Sei Investments Co has a history of taking positions in derivatives of the underlying security (STLD) in the form of stock options.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

STLD / Steel Dynamics, Inc. Historical Put/Call Ratio
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 STEEL DYNAMICS COM 858119100 117,731 6,730 6.06 19,954 28.91 0.0197
2025-11-13 2025-09-30 13F STEEL DYNAMICS COM 858119100 111,001 5,950 5.66 15,480 15.12 0.0166
2025-08-14 2025-06-30 13F STEEL DYNAMICS COM 858119100 105,051 7,208 7.37 13,447 9.83 0.0156
2025-05-14 2025-03-31 13F/A-1 STEEL DYNAMICS COM 858119100 97,843 10,225 11.67 12,243 22.52 0.0158
2025-05-13 2025-03-31 13F STEEL DYNAMICS COM 858119100 97,339 9,721 11,920 0.0130
2025-02-11 2024-12-31 13F STEEL DYNAMICS COM 858119100 87,618 -12,800 -12.75 9,994 -21.06 0.0128
2024-11-12 2024-09-30 13F STEEL DYNAMICS COM 858119100 100,418 -28,898 -22.35 12,660 -24.42 0.0164
2024-08-13 2024-06-30 13F STEEL DYNAMICS COM 858119100 129,316 21,204 19.61 16,750 4.52 0.0237
2024-05-07 2024-03-31 13F STEEL DYNAMICS COM 858119100 108,112 6,263 6.15 16,026 33.23 0.0235
2024-02-14 2023-12-31 13F STEEL DYNAMICS COM 858119100 101,849 -4,587 -4.31 12,028 5.41 0.0193
2023-11-14 2023-09-30 13F STEEL DYNAMICS COM 858119100 106,436 -2,450 -2.25 11,411 -3.79 0.0205
2023-08-11 2023-06-30 13F STEEL DYNAMICS COM 858119100 108,886 7,304 7.19 11,860 3.27 0.0207
2023-05-12 2023-03-31 13F STEEL DYNAMICS COM 858119100 101,582 -13,777 -11.94 11,485 1.90 0.0213
2023-02-10 2022-12-31 13F STEEL DYNAMICS COM 858119100 115,359 6,721 6.19 11,270 46.21 0.0250
2022-11-14 2022-09-30 13F STEEL DYNAMICS COM 858119100 108,638 11,760 12.14 7,708 19.58 0.0172
2022-08-15 2022-06-30 13F STEEL DYNAMICS COM 858119100 96,878 880 0.92 6,446 -20.47 0.0139
2022-05-13 2022-03-31 13F STEEL DYNAMICS COM 858119100 95,998 -5,639 -5.55 8,105 27.54 0.0163
2022-02-14 2021-12-31 13F STEEL DYNAMICS COM 858119100 101,637 -21,050 -17.16 6,355 -12.15 0.0119
2021-11-12 2021-09-30 13F STEEL DYNAMICS COM 858119100 122,687 -10,765 -8.07 7,234 -9.30 0.0152
2021-08-06 2021-06-30 13F STEEL DYNAMICS COM 858119100 133,452 12,977 10.77 7,976 42.35 0.0177
2021-05-12 2021-03-31 13F STEEL DYNAMICS COM 858119100 120,475 5,077 4.40 5,603 30.03 0.0141
2021-02-08 2020-12-31 13F STEEL DYNAMICS COM 858119100 115,398 546 0.48 4,309 30.14 0.0111
2020-12-04 2020-09-30 13F/A-1 STEEL DYNAMICS COM 858119100 114,852 -15,750 -12.06 3,311 -3.27 0.0096
2020-11-06 2020-09-30 13F STEEL DYNAMICS COM 858119100 130,198 -404 3,750 9,029.1662
2020-08-17 2020-06-30 13F/A-1 STEEL DYNAMICS COM 858119100 130,602 58,099 80.13 3,423 113.94 0.0106
2020-08-11 2020-06-30 13F STEEL DYNAMICS COM 858119100 78,719 6,216 2,347 6,366.3624
2020-05-14 2020-03-31 13F STEEL DYNAMICS COM 858119100 72,503 15,818 27.91 1,600 -14.26 0.0059
2020-02-06 2019-12-31 13F STEEL DYNAMICS COM 858119100 56,685 4,081 7.76 1,866 26.17 0.0056
2019-11-12 2019-09-30 13F STEEL DYNAMICS COM 858119100 52,604 -3,400 -6.07 1,479 -7.56 0.0038
2019-08-14 2019-06-30 13F STEEL DYNAMICS COM 858119100 56,004 -121,500 -68.45 1,600 -74.41 0.0052
2019-05-15 2019-03-31 13F STEEL DYNAMICS COM 858119100 177,504 62,087 53.79 6,253 21.65 0.0210
2019-02-13 2018-12-31 13F STEEL DYNAMICS COM 858119100 115,417 919 0.80 5,140 -0.91 0.0183
2018-11-08 2018-09-30 13F STEEL DYNAMICS COM 858119100 114,498 -19,115 -14.31 5,187 -15.52 0.0188
2018-08-03 2018-06-30 13F STEEL DYNAMICS COM 858119100 133,613 -17,327 -11.48 6,140 -8.00 0.0209
2018-05-11 2018-03-31 13F STEEL DYNAMICS COM 858119100 150,940 -73,416 -32.72 6,674 -31.03 0.0256
2018-02-08 2017-12-31 13F STEEL DYNAMICS COM 858119100 224,356 -9,826 -4.20 9,677 19.88 0.0336
2017-11-06 2017-09-30 13F STEEL DYNAMICS COM 858119100 234,182 -97,642 -29.43 8,072 -32.07 0.0287
2017-07-31 2017-06-30 13F STEEL DYNAMICS COM 858119100 331,824 -77,483 -18.93 11,882 -16.48 0.0474
2017-05-05 2017-03-31 13F STEEL DYNAMICS COM 858119100 409,307 253,372 162.49 14,227 156.39 0.0623
2017-02-02 2016-12-31 13F STEEL DYNAMICS COM 858119100 155,935 13,291 9.32 5,549 55.70 0.0269
2016-11-04 2016-09-30 13F STEEL DYNAMICS COM 858119100 142,644 -2,216 -1.53 3,564 0.42 0.0181
2016-08-11 2016-06-30 13F STEEL DYNAMICS COM 858119100 144,860 140,071 2,924.85 3,549 3,186.11 0.0213
2016-05-10 2016-03-31 13F/A-1 STEEL DYNAMICS COM 858119100 4,789 -5,778 -54.68 108 -42.55 0.0007
2016-02-03 2015-12-31 13F STEEL DYNAMICS COM 858119100 10,567 6,745 176.48 188 184.85 0.0011
2015-11-02 2015-09-30 13F/A-1 STEEL DYNAMICS COM 858119100 3,822 280 7.91 66 -9.59 0.0006
2015-10-30 2015-09-30 13F STEEL DYNAMICS COM 858119100 3,822 66
2015-08-07 2015-06-30 13F/A-1 STEEL DYNAMICS COM 858119100 3,542 314 9.73 73 14.06 0.0007
2015-08-04 2015-06-30 13F STEEL DYNAMICS COM 858119100 3,542 314 73 0.0007
2015-05-14 2015-03-31 13F/A-1 STEEL DYNAMICS COM 858119100 3,228 -7,114 -68.79 64 -68.47 0.0006
2015-05-01 2015-03-31 13F STATOIL ASA PUT 858119100 3,228 3,228 64 0.0006
2015-02-10 2014-12-31 13F STEEL DYNAMICS COM 858119100 10,342 10,342 203 0.0018
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2015-05-01 2015-03-31 13F STATOIL ASA PUT 3,228 64 n/a n/a n/a
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.