Sei Investments Co reports 10.66% decrease in ownership of MTZ / MasTec, Inc.

MasTec, Inc.

US ˙ NYSE ˙ US5763231090

Security	MTZ / MasTec, Inc.
Institution	Sei Investments Co
Latest Disclosed Ownership	101,716 shares
Latest Disclosed Value	$ 22,109,954

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 101,716 shares of MasTec, Inc. (US:MTZ) valued at $22,110,007 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 113,856 shares of MasTec, Inc.. This represents a change in shares of -10.66% during the quarter. The current value of the position is $38,116,037 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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-02-13	2025-12-31	13F	MASTEC	COM	576323109	101,716	-12,140	-10.66	22,110	-8.75	0.0218
2025-11-13	2025-09-30	13F	MASTEC	COM	576323109	113,856	18,007	18.79	24,230	48.33	0.0261
2025-08-14	2025-06-30	13F	MASTEC	COM	576323109	95,849	24,578	34.49	16,335	96.39	0.0189
2025-05-14	2025-03-31	13F/A-1	MASTEC	COM	576323109	71,271	-11,797	-14.20	8,318	-26.45	0.0107
2025-05-13	2025-03-31	13F	MASTEC	COM	576323109	84,271	1,203		11,299		0.0123
2025-02-11	2024-12-31	13F	MASTEC	COM	576323109	83,068	-8,342	-9.13	11,309	0.50	0.0145
2024-11-12	2024-09-30	13F	MASTEC	COM	576323109	91,410	-20,373	-18.23	11,253	-5.91	0.0146
2024-08-13	2024-06-30	13F	MASTEC	COM	576323109	111,783	-29,605	-20.94	11,960	-9.29	0.0169
2024-05-07	2024-03-31	13F	MASTEC	COM	576323109	141,388	-62,987	-30.82	13,184	-14.80	0.0193
2024-02-14	2023-12-31	13F	MASTEC	COM	576323109	204,375	60,047	41.60	15,475	48.98	0.0248
2023-11-14	2023-09-30	13F	MASTEC	COM	576323109	144,328	-21,049	-12.73	10,387	-46.76	0.0187
2023-08-11	2023-06-30	13F	MASTEC	COM	576323109	165,377	26,296	18.91	19,510	48.54	0.0340
2023-05-12	2023-03-31	13F	MASTEC	COM	576323109	139,081	105,188	310.35	13,135	354.15	0.0244
2023-02-10	2022-12-31	13F	MASTEC	COM	576323109	33,893	-90,528	-72.76	2,892	-63.40	0.0064
2022-11-14	2022-09-30	13F	MASTEC	COM	576323109	124,421	26,162	26.63	7,901	12.17	0.0176
2022-08-15	2022-06-30	13F	MASTEC	COM	576323109	98,259	69,154	237.60	7,044	177.87	0.0152
2022-05-13	2022-03-31	13F	MASTEC	COM	576323109	29,105	1,624	5.91	2,535	0.00	0.0051
2022-02-14	2021-12-31	13F	MASTEC	COM	576323109	27,481	2,494	9.98	2,535	17.69	0.0048
2021-11-12	2021-09-30	13F	MASTEC	COM	576323109	24,987	-13,119	-34.43	2,154	-47.18	0.0045
2021-08-06	2021-06-30	13F	MASTEC	COM	576323109	38,106	-23,764	-38.41	4,078	-26.42	0.0090
2021-05-12	2021-03-31	13F	MASTEC	COM	576323109	61,870	-6,267	-9.20	5,542	18.22	0.0140
2021-02-08	2020-12-31	13F	MASTEC	COM	576323109	68,137	11,923	21.21	4,688	101.12	0.0121
2020-12-04	2020-09-30	13F/A-1	MASTEC	COM	576323109	56,214	-90,117	-61.58	2,331	-64.20	0.0067
2020-11-06	2020-09-30	13F	MASTEC	COM	576323109	57,018	-89,313		2,365		5,694.3942
2020-08-17	2020-06-30	13F/A-1	MASTEC	COM	576323109	146,331	-22,438	-13.30	6,511	17.89	0.0202
2020-08-11	2020-06-30	13F	MASTEC	COM	576323109	189,067	20,298		11,816		32,051.5290
2020-05-14	2020-03-31	13F	MASTEC	COM	576323109	168,769	-18,006	-9.64	5,523	-53.91	0.0203
2020-02-06	2019-12-31	13F	MASTEC	COM	576323109	186,775	-30,668	-14.10	11,983	-15.12	0.0357
2019-11-12	2019-09-30	13F	MASTEC	COM	576323109	217,443	-22,058	-9.21	14,117	14.38	0.0361
2019-08-14	2019-06-30	13F	MASTEC	COM	576323109	239,501	31,205	14.98	12,342	23.14	0.0403
2019-05-15	2019-03-31	13F	MASTEC	COM	576323109	208,296	54	0.03	10,023	7.83	0.0337
2019-02-13	2018-12-31	13F	MASTEC	COM	576323109	208,242	427	0.21	9,295	0.19	0.0331
2018-11-08	2018-09-30	13F	MASTEC	COM	576323109	207,815	15,132	7.85	9,277	-5.13	0.0336
2018-08-03	2018-06-30	13F	MASTEC	COM	576323109	192,683	-35,257	-15.47	9,779	-8.82	0.0332
2018-05-11	2018-03-31	13F	MASTEC	COM	576323109	227,940	-24,604	-9.74	10,725	-13.24	0.0411
2018-02-08	2017-12-31	13F	MASTEC	COM	576323109	252,544	76,893	43.78	12,362	51.68	0.0429
2017-11-06	2017-09-30	13F	MASTEC	COM	576323109	175,651	42,973	32.39	8,150	36.04	0.0290
2017-07-31	2017-06-30	13F	MASTEC	COM	576323109	132,678	19,190	16.91	5,991	31.82	0.0239
2017-05-05	2017-03-31	13F	MASTEC	COM	576323109	113,488	-1,324	-1.15	4,545	3.48	0.0199
2017-02-02	2016-12-31	13F	MASTEC	COM	576323109	114,812	45,942	66.71	4,392	114.45	0.0213
2016-11-04	2016-09-30	13F	MASTEC	COM	576323109	68,870	-10,404	-13.12	2,048	15.77	0.0104
2016-08-11	2016-06-30	13F	MASTEC	COM	576323109	79,274	23,085	41.08	1,769	55.58	0.0106
2016-05-10	2016-03-31	13F/A-1	MASTEC	COM	576323109	56,189	-119,714	-68.06	1,137	-62.81	0.0071
2016-02-03	2015-12-31	13F	MASTEC	COM	576323109	175,903	133,515	314.98	3,057	355.59	0.0186
2015-11-02	2015-09-30	13F/A-1	MASTEC	COM	576323109	42,388	10,059	31.11	671	4.52	0.0062
2015-10-30	2015-09-30	13F	MASTEC	COM	576323109	42,388			672
2015-08-07	2015-06-30	13F/A-1	MASTEC	COM	576323109	32,329	-346	-1.06	642	1.90	0.0058
2015-08-04	2015-06-30	13F	MASTEC	COM	576323109	32,329	-346		642		0.0058
2015-05-14	2015-03-31	13F/A-1	MASTEC	COM	576323109	32,675	-3,384	-9.38	630	-22.70	0.0055
2015-05-01	2015-03-31	13F	MASSEY ENERGY	NOTE 3.250% 8/0	576323109	32,675			630
2015-02-10	2014-12-31	13F	MASTEC	COM	576323109	36,059	36,059		815		0.0072

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.