Select Water Solutions, Inc.
US ˙ NYSE ˙ US81617J3014

SecurityWTTR / Select Water Solutions, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership211,433 shares
Latest Disclosed Value $ 2,224,246
Sei Investments Co reports 514.60% increase in ownership of WTTR / Select Water Solutions, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 211,433 shares of Select Water Solutions, Inc. (US:WTTR) valued at $2,224,275 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 34,402 shares of Select Water Solutions, Inc.. This represents a change in shares of 514.60% during the quarter. The current value of the position is $3,807,908 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 SELECT WATER SOLUTIONS CL A COM 81617J301 211,433 177,031 514.60 2,224 505.99 0.0022
2025-11-13 2025-09-30 13F SELECT WATER SOLUTIONS CL A COM 81617J301 34,402 -6,721 -16.34 368 3.38 0.0004
2025-08-14 2025-06-30 13F SELECT WATER SOLUTIONS CL A COM 81617J301 41,123 -172,699 -80.77 355 -84.19 0.0004
2025-05-14 2025-03-31 13F/A-1 SELECT WATER SOLUTIONS CL A COM 81617J301 213,822 42,631 24.90 2,245 -0.93 0.0029
2025-05-13 2025-03-31 13F SELECT WATER SOLUTIONS CL A COM 81617J301 172,956 1,765 2,241 0.0024
2025-02-11 2024-12-31 13F SELECT WATER SOLUTIONS CL A COM 81617J301 171,191 144,765 547.81 2,267 670.75 0.0029
2024-11-12 2024-09-30 13F SELECT WATER SOLUTIONS CL A COM 81617J301 26,426 7,026 36.22 294 42.03 0.0004
2024-08-13 2024-06-30 13F SELECT WATER SOLUTIONS CL A COM 81617J301 19,400 -157 -0.80 208 15.00 0.0003
2024-05-07 2024-03-31 13F SELECT WATER SOLUTIONS CL A COM 81617J301 19,557 19,557 181 0.0003
2023-05-12 2023-03-31 13F SELECT ENERGY SVCS CL A COM 81617J301 0 -14,051 -100.00 0 -100.00
2023-02-10 2022-12-31 13F SELECT ENERGY SVCS CL A COM 81617J301 14,051 14,051 130 0.0003
2022-11-14 2022-09-30 13F SELECT ENERGY SVCS CL A COM 81617J301 0 -44,460 -100.00 0 -100.00
2022-08-15 2022-06-30 13F SELECT ENERGY SVCS CL A COM 81617J301 44,460 -74,833 -62.73 269 -72.75 0.0006
2022-05-13 2022-03-31 13F SELECT ENERGY SVCS CL A COM 81617J301 119,293 57,985 94.58 987 180.40 0.0020
2022-02-14 2021-12-31 13F SELECT ENERGY SVCS CL A COM 81617J301 61,308 833 1.38 352 21.80 0.0007
2021-11-12 2021-09-30 13F SELECT ENERGY SVCS CL A COM 81617J301 60,475 132 0.22 289 -14.24 0.0006
2021-08-06 2021-06-30 13F SELECT ENERGY SVCS CL A COM 81617J301 60,343 484 0.81 337 22.55 0.0007
2021-05-12 2021-03-31 13F SELECT ENERGY SVCS CL A COM 81617J301 59,859 -18,483 -23.59 275 -9.24 0.0007
2021-02-08 2020-12-31 13F SELECT ENERGY SVCS CL A COM 81617J301 78,342 18,602 31.14 303 42.25 0.0008
2020-12-04 2020-09-30 13F/A-1 SELECT ENERGY SVCS CL A COM 81617J301 59,740 19,564 48.70 213 21.02 0.0006
2020-11-06 2020-09-30 13F SELECT ENERGY SVCS CL A COM 81617J301 60,694 20,518 217 522.4878
2020-08-17 2020-06-30 13F/A-1 SELECT ENERGY SVCS CL A COM 81617J301 40,176 -2,632 -6.15 176 44.26 0.0005
2020-08-11 2020-06-30 13F SELECT ENERGY SVCS CL A COM 81617J301 36,898 -5,910 291 789.3530
2020-05-14 2020-03-31 13F SELECT ENERGY SVCS CL A COM 81617J301 42,808 6,785 18.84 122 -60.26 0.0004
2020-02-06 2019-12-31 13F SELECT ENERGY SVCS CL A COM 81617J301 36,023 25,542 243.70 307 379.69 0.0009
2019-11-12 2019-09-30 13F SELECT ENERGY SVCS CL A COM 81617J301 10,481 4 0.04 64 -34.69 0.0002
2019-08-14 2019-06-30 13F SELECT ENERGY SVCS CL A COM 81617J301 10,477 -38,311 -78.53 98 -82.69 0.0003
2019-05-15 2019-03-31 13F SELECT ENERGY SVCS CL A COM 81617J301 48,788 43,594 839.31 566 3,942.86 0.0019
2019-02-13 2018-12-31 13F SELECT ENERGY SVCS CL A COM 81617J301 5,194 2,397 85.70 14 -44.00 0.0000
2018-11-08 2018-09-30 13F SELECT ENERGY SVCS CL A COM 81617J301 2,797 -3,154 -53.00 25 -70.93 0.0001
2018-08-03 2018-06-30 13F SELECT ENERGY SVCS CL A COM 81617J301 5,951 -586 -8.96 86 4.88 0.0003
2018-05-11 2018-03-31 13F SELECT ENERGY SVCS CL A COM 81617J301 6,537 1,035 18.81 82 -18.81 0.0003
2018-02-08 2017-12-31 13F SELECT ENERGY SVCS CL A COM 81617J301 5,502 -116 -2.06 101 13.48 0.0004
2017-11-06 2017-09-30 13F SELECT ENERGY SVCS CL A COM 81617J301 5,618 5,618 89 0.0003
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.