Stagwell Inc.
US ˙ NasdaqGS ˙ US85256A1097

SecuritySTGW / Stagwell Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership182,037 shares
Latest Disclosed Value $ 890,146
Sei Investments Co reports 169.67% increase in ownership of STGW / Stagwell Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 182,037 shares of Stagwell Inc. (US:STGW) valued at $890,161 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 67,504 shares of Stagwell Inc.. This represents a change in shares of 169.67% during the quarter. The current value of the position is $1,172,318 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.

Upgrade to unlock premium data and export to Excel .

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 STAGWELL COM CL A 85256A109 182,037 114,533 169.67 890 134.21 0.0009
2025-11-13 2025-09-30 13F STAGWELL COM CL A 85256A109 67,504 32,500 92.85 380 142.04 0.0004
2025-08-14 2025-06-30 13F STAGWELL COM CL A 85256A109 35,004 -119,112 -77.29 158 -83.15 0.0002
2025-05-14 2025-03-31 13F/A-1 STAGWELL COM CL A 85256A109 154,116 -15,807 -9.30 932 -16.64 0.0012
2025-05-13 2025-03-31 13F STAGWELL COM CL A 85256A109 169,923 0 1,118 0.0012
2025-02-11 2024-12-31 13F STAGWELL COM CL A 85256A109 169,923 -9,147 -5.11 1,118 -11.06 0.0014
2024-11-12 2024-09-30 13F STAGWELL COM CL A 85256A109 179,070 -2,896 -1.59 1,257 1.29 0.0016
2024-08-13 2024-06-30 13F STAGWELL COM CL A 85256A109 181,966 5,918 3.36 1,241 13.33 0.0018
2024-05-07 2024-03-31 13F STAGWELL COM CL A 85256A109 176,048 -34,744 -16.48 1,095 -21.62 0.0016
2024-02-14 2023-12-31 13F STAGWELL COM CL A 85256A109 210,792 28,039 15.34 1,398 63.01 0.0022
2023-11-14 2023-09-30 13F STAGWELL COM CL A 85256A109 182,753 43,115 30.88 857 -14.81 0.0015
2023-08-11 2023-06-30 13F STAGWELL COM CL A 85256A109 139,638 -49,097 -26.01 1,007 -28.14 0.0018
2023-05-12 2023-03-31 13F STAGWELL COM CL A 85256A109 188,735 97,860 107.69 1,400 148.23 0.0026
2023-02-10 2022-12-31 13F STAGWELL COM CL A 85256A109 90,875 11,325 14.24 564 1.99 0.0013
2022-11-14 2022-09-30 13F STAGWELL COM CL A 85256A109 79,550 9,830 14.10 553 45.91 0.0012
2022-08-15 2022-06-30 13F STAGWELL COM CL A 85256A109 69,720 -1,654 -2.32 379 -26.69 0.0008
2022-05-13 2022-03-31 13F STAGWELL COM CL A 85256A109 71,374 10,255 16.78 517 -2.45 0.0010
2022-02-14 2021-12-31 13F STAGWELL COM CL A 85256A109 61,119 -17,030 -21.79 530 -11.52 0.0010
2021-11-12 2021-09-30 13F STAGWELL COM CL A 85256A109 78,149 6,719 9.41 599 43.30 0.0013
2021-08-06 2021-06-30 13F MDC PARTNERS CL A SUB VTG 552697104 71,430 -22,400 -23.87 418 42.66 0.0009
2021-05-12 2021-03-31 13F MDC PARTNERS CL A SUB VTG 552697104 93,830 0 0.00 293 24.15 0.0007
2021-02-08 2020-12-31 13F MDC PARTNERS CL A SUB VTG 552697104 93,830 6,052 6.89 236 67.38 0.0006
2020-12-04 2020-09-30 13F/A-1 MDC PARTNERS CL A SUB VTG 552697104 87,778 53,135 153.38 141 95.83 0.0004
2020-11-06 2020-09-30 13F MDC PARTNERS CL A SUB VTG 552697104 87,778 53,135 141 339.4967
2020-08-17 2020-06-30 13F/A-1 MDC PARTNERS CL A SUB VTG 552697104 34,643 0 0.00 72 44.00 0.0002
2020-08-11 2020-06-30 13F MDC PARTNERS CL A SUB VTG 552697104 34,643 0 96 260.4051
2020-05-14 2020-03-31 13F MDC PARTNERS CL A SUB VTG 552697104 34,643 0 0.00 50 -47.92 0.0002
2020-02-06 2019-12-31 13F MDC PARTNERS CL A SUB VTG 552697104 34,643 -93,649 -73.00 96 -73.48 0.0003
2019-11-12 2019-09-30 13F MDC PARTNERS CL A SUB VTG 552697104 128,292 -41,200 -24.31 362 -15.22 0.0009
2019-08-14 2019-06-30 13F MDC PARTNERS CL A SUB VTG 552697104 169,492 600 0.36 427 12.37 0.0014
2019-05-15 2019-03-31 13F MDC PARTNERS CL A SUB VTG 552697104 168,892 145,664 627.11 380 295.83 0.0013
2019-02-13 2018-12-31 13F MDC PARTNERS CL A SUB VTG 552697104 23,228 0 0.00 96 0.00 0.0003
2018-11-08 2018-09-30 13F MDC PARTNERS CL A SUB VTG 552697104 23,228 -36 -0.15 96 -10.28 0.0003
2018-08-03 2018-06-30 13F MDC PARTNERS CL A SUB VTG 552697104 23,264 12,099 108.37 107 33.75 0.0004
2018-05-11 2018-03-31 13F MDC PARTNERS CL A SUB VTG 552697104 11,165 1,304 13.22 80 -16.67 0.0003
2018-02-08 2017-12-31 13F MDC PARTNERS CL A SUB VTG 552697104 9,861 9,752 8,946.79 96 9,500.00 0.0003
2017-11-06 2017-09-30 13F MDC PARTNERS CL A SUB VTG 552697104 109 -27,574 -99.61 1 -99.64 0.0000
2017-07-31 2017-06-30 13F MDC PARTNERS CL A SUB VTG 552697104 27,683 26,989 3,888.90 274 3,814.29 0.0011
2017-05-05 2017-03-31 13F MDC PARTNERS CL A SUB VTG 552697104 694 -21,034 -96.81 7 -95.07 0.0000
2017-02-02 2016-12-31 13F MDC PARTNERS CL A SUB VTG 552697104 21,728 8,446 63.59 142 0.00 0.0007
2016-11-04 2016-09-30 13F MDC PARTNERS CL A SUB VTG 552697104 13,282 5,441 69.39 142 -0.70 0.0007
2016-08-11 2016-06-30 13F MDC PARTNERS CL A SUB VTG 552697104 7,841 5,469 230.56 143 155.36 0.0009
2016-05-10 2016-03-31 13F/A-1 MDC PARTNERS CL A SUB VTG 552697104 2,372 -147,804 -98.42 56 -98.28 0.0003
2016-02-03 2015-12-31 13F MDC PARTNERS CL A SUB VTG 552697104 150,176 150,176 3,262 0.0199
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.