Tradeweb Markets Inc.
US ˙ NasdaqGS ˙ US8926721064

SecurityTW / Tradeweb Markets Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership112,779 shares
Latest Disclosed Value $ 12,130,538
Sei Investments Co reports 34.26% decrease in ownership of TW / Tradeweb Markets Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 112,779 shares of Tradeweb Markets Inc. (US:TW) valued at $12,128,254 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 171,554 shares of Tradeweb Markets Inc.. This represents a change in shares of -34.26% during the quarter. The current value of the position is $11,326,395 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 TRADEWEB MKTS CL A 892672106 112,779 -58,775 -34.26 12,131 -36.28
2025-11-13 2025-09-30 13F TRADEWEB MKTS CL A 892672106 171,554 -121,459 -41.45 19,036 -55.62 0.0205
2025-08-14 2025-06-30 13F TRADEWEB MKTS CL A 892672106 293,013 -48,619 -14.23 42,897 -15.43 0.0497
2025-05-14 2025-03-31 13F/A-1 TRADEWEB MKTS CL A 892672106 341,632 22,451 7.03 50,721 21.38 0.0653
2025-05-13 2025-03-31 13F TRADEWEB MKTS CL A 892672106 322,647 3,466 42,624 0.0464
2025-02-11 2024-12-31 13F TRADEWEB MKTS CL A 892672106 319,181 -3,690 -1.14 41,786 4.65 0.0537
2024-11-12 2024-09-30 13F TRADEWEB MKTS CL A 892672106 322,871 -25,150 -7.23 39,929 8.24 0.0519
2024-08-13 2024-06-30 13F TRADEWEB MKTS CL A 892672106 348,021 -3,658 -1.04 36,890 0.70 0.0523
2024-05-07 2024-03-31 13F TRADEWEB MKTS CL A 892672106 351,679 -9,024 -2.50 36,635 11.75 0.0537
2024-02-14 2023-12-31 13F TRADEWEB MKTS CL A 892672106 360,703 44,912 14.22 32,781 29.44 0.0526
2023-11-14 2023-09-30 13F TRADEWEB MKTS CL A 892672106 315,791 -41,364 -11.58 25,326 3.55 0.0455
2023-08-11 2023-06-30 13F TRADEWEB MKTS CL A 892672106 357,155 32,449 9.99 24,458 -4.68 0.0427
2023-05-12 2023-03-31 13F TRADEWEB MKTS CL A 892672106 324,706 26,133 8.75 25,658 32.36 0.0477
2023-02-10 2022-12-31 13F TRADEWEB MKTS CL A 892672106 298,573 -35,690 -10.68 19,385 2.79 0.0431
2022-11-14 2022-09-30 13F TRADEWEB MKTS CL A 892672106 334,263 602 0.18 18,859 -17.06 0.0421
2022-08-15 2022-06-30 13F TRADEWEB MKTS CL A 892672106 333,661 32,143 10.66 22,737 -14.01 0.0491
2022-05-13 2022-03-31 13F TRADEWEB MKTS CL A 892672106 301,518 4,199 1.41 26,440 -11.20 0.0531
2022-02-14 2021-12-31 13F TRADEWEB MKTS CL A 892672106 297,319 -10,722 -3.48 29,774 19.65 0.0559
2021-11-12 2021-09-30 13F TRADEWEB MKTS CL A 892672106 308,041 16,647 5.71 24,884 1.38 0.0522
2021-08-06 2021-06-30 13F TRADEWEB MKTS CL A 892672106 291,394 -15,046 -4.91 24,546 9.03 0.0544
2021-05-12 2021-03-31 13F TRADEWEB MKTS CL A 892672106 306,440 33,351 12.21 22,513 31.38 0.0567
2021-02-08 2020-12-31 13F TRADEWEB MKTS CL A 892672106 273,089 14,158 5.47 17,136 13.47 0.0443
2020-12-04 2020-09-30 13F/A-1 TRADEWEB MKTS CL A 892672106 258,931 64,525 33.19 15,102 33.61 0.0437
2020-11-06 2020-09-30 13F TRADEWEB MKTS CL A 892672106 259,401 64,995 15,129 36,427.2682
2020-08-17 2020-06-30 13F/A-1 TRADEWEB MKTS CL A 892672106 194,406 29,024 17.55 11,303 62.56 0.0351
2020-08-11 2020-06-30 13F TRADEWEB MKTS CL A 892672106 57,490 -107,892 2,665 7,228.9544
2020-05-14 2020-03-31 13F TRADEWEB MKTS CL A 892672106 165,382 96,801 141.15 6,953 124.73 0.0255
2020-02-06 2019-12-31 13F TRADEWEB MKTS CL A 892672106 68,581 56,615 473.13 3,094 1,118.11 0.0092
2019-11-12 2019-09-30 13F TRADEWEB MKTS CL A 892672106 11,966 410 3.55 254 -30.79 0.0006
2019-08-14 2019-06-30 13F TRADEWEB MKTS CL A 892672106 11,556 11,556 367 0.0012
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.