Morgan Stanley reports 19.77% increase in ownership of MTZ / MasTec, Inc.

馬斯泰克公司

US ˙ NYSE ˙ US5763231090

Security	MTZ / MasTec, Inc.
Institution	Morgan Stanley
Latest Disclosed Ownership	586,743 shares
Latest Disclosed Value	$ 188,779,181

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 586,743 shares of MasTec, Inc. (US:MTZ) valued at $188,778,693 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 489,911 shares of MasTec, Inc.. This represents a change in shares of 19.77% during the quarter. The current value of the position is $219,870,204 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 (%)
2026-05-15	2026-03-31	13F	MASTEC	COM	576323109	586,743	96,832	19.77	188,779	77.27	0.0114
2026-05-27	2025-12-31	13F/A-1	MASTEC	COM	576323109	489,911	21,640	4.62	106,492	6.86	0.0064
2026-02-13	2025-12-31	13F	MASTEC	COM	576323109	489,911	21,640		106,492		0.0064
2026-05-27	2025-09-30	13F/A-1	MASTEC	COM	576323109	468,271	-60,670	-11.47	99,653	10.54	0.0060
2025-11-14	2025-09-30	13F	MASTEC	COM	576323109	468,271	-60,670		99,653		0.0060
2025-08-15	2025-06-30	13F	MASTEC	COM	576323109	528,941	52,238	10.96	90,148	62.03	0.0059
2025-05-15	2025-03-31	13F	MASTEC	COM	576323109	476,703	24,654	5.45	55,636	-9.60	0.0040
2025-05-15	2024-12-31	13F/A-1	MASTEC	COM	576323109	452,049	-59,290	-11.60	61,542	-2.23	0.0043
2025-02-14	2024-12-31	13F	MASTEC	COM	576323109	452,049	-59,290		61,542		0.0043
2025-05-14	2024-09-30	13F/A-2	MASTEC	COM	576323109	511,339	96,641	23.30	62,946	41.87	0.0046
2025-02-14	2024-09-30	13F/A-1	MASTEC	COM	576323109	511,339	96,641		62,946		0.0046
2024-11-14	2024-09-30	13F	MASTEC	COM	576323109	511,339	96,641		62,946		0.0005
2025-05-14	2024-06-30	13F/A-2	MASTEC	COM	576323109	414,698	-98,808	-19.24	44,369	-7.34	0.0034
2024-10-17	2024-06-30	13F/A-1	MASTEC	COM	576323109	414,698	-98,808		44,369		0.0034
2024-08-14	2024-06-30	13F	MASTEC	COM	576323109	414,698	-98,808		44,369		0.0034
2024-10-17	2024-03-31	13F/A-2	MASTEC	COM	576323109	513,506	-67,526	-11.62	47,884	8.84	0.0038
2024-08-16	2024-03-31	13F/A-1	MASTEC	COM	576323109	513,506	-67,526		47,884		0.0005
2024-05-15	2024-03-31	13F	MASTEC	COM	576323109	513,506	-67,526		47,884		0.0038
2024-08-16	2023-12-31	13F/A-1	MASTEC	COM	576323109	581,032	118,382	25.59	43,996	32.13	0.0039
2024-02-13	2023-12-31	13F	MASTEC	COM	576323109	581,032	118,382		43,996		0.0039
2023-11-15	2023-09-30	13F	MASTEC	COM	576323109	462,650	-14,341	-3.01	33,297	-40.83	0.0034
2023-08-14	2023-06-30	13F	MASTEC	COM	576323109	476,991	107,268	29.01	56,271	61.16	0.0055
2023-05-15	2023-03-31	13F	MASTEC	COM	576323109	369,723	-38,129	-9.35	34,917	0.33	0.0037
2023-02-14	2022-12-31	13F	MASTEC	COM	576323109	407,852	33,473	8.94	34,802	46.39	0.0040
2022-11-14	2022-09-30	13F	MASTEC	COM	576323109	374,379	82,085	28.08	23,773	13.51	0.0032
2022-10-27	2022-06-30	13F/A-1	MASTEC	COM	576323109	292,294	-5,670	-1.90	20,944	-19.30	0.0027
2022-08-15	2022-06-30	13F	MASTEC	COM	576323109	292,294	-5,670		20,944		0.0005
2022-10-27	2022-03-31	13F/A-1	MASTEC	COM	576323109	297,964	-25,203	-7.80	25,953	-12.98	0.0035
2022-05-13	2022-03-31	13F	MASTEC	COM	576323109	297,964	-25,203		25,953		0.0035
2022-02-14	2021-12-31	13F	MASTEC	COM	576323109	323,167	-174,930	-35.12	29,823	-30.61	0.0037
2021-11-15	2021-09-30	13F	MASTEC	COM	576323109	498,097	134,233	36.89	42,977	11.32	0.0058
2021-08-23	2021-06-30	13F/A-1	MASTEC	COM	576323109	363,864	102,619	39.28	38,607	57.72	0.0051
2021-08-16	2021-06-30	13F	MASTEC	COM	576323109	363,864	102,619		38,607		0.0011
2021-05-17	2021-03-31	13F	MASTEC	COM	576323109	261,245	14,777	6.00	24,478	45.66	0.0036
2021-02-16	2020-12-31	13F	MASTEC	COM	576323109	246,468	-208,616	-45.84	16,805	-12.49	0.0026
2020-11-13	2020-09-30	13F	MASTEC	COM	576323109	455,084	317,592	230.99	19,204	211.30	0.0037
2020-08-14	2020-06-30	13F	MASTEC	COM	576323109	137,492	-225,748	-62.15	6,169	-48.11	0.0014
2020-05-26	2020-03-31	13F/A-1	MASTEC	COM	576323109	363,240	-123,296	-25.34	11,889	-61.91	0.0032
2020-05-15	2020-03-31	13F	MASTEC	COM	576323109	363,240	-123,296		11,889		913.3230
2020-02-14	2019-12-31	13F	MASTEC	COM	576323109	486,536	91,856	23.27	31,217	21.81	0.0073
2019-11-14	2019-09-30	13F	MASTEC	COM	576323109	394,680	252,715	178.01	25,627	250.33	0.0068
2019-08-14	2019-06-30	13F	MASTEC	COM	576323109	141,965	-21,671	-13.24	7,315	-7.05	0.0019
2019-05-15	2019-03-31	13F	MASTEC	COM	576323109	163,636	-109,978	-40.19	7,870	-29.08	0.0022
2019-02-14	2018-12-31	13F	MASTEC	COM	576323109	273,614	-104,872	-27.71	11,097	-34.33	0.0033
2019-04-23	2018-09-30	13F/A-2	MASTEC	COM	576323109	378,486	-210,016	-35.69	16,899	-43.42	0.0042
2018-11-20	2018-09-30	13F/A-1	MASTEC	COM	576323109	378,486	0		16,899		0.0042
2018-11-14	2018-09-30	13F	MASTEC	COM	576323109	378,486	-210,016		16,899
2019-04-23	2018-06-30	13F/A-1	MASTEC	COM	576323109	588,502	72,290	14.00	29,867	22.98	0.0081
2018-08-14	2018-06-30	13F	MASTEC	COM	576323109	588,502	72,290		29,867
2019-04-23	2018-03-31	13F/A-1	MASTEC	COM	576323109	516,212	-39,125	-7.05	24,287	-10.66	0.0067
2018-05-14	2018-03-31	13F	MASTEC	COM	576323109	516,212	-39,125		24,287
2019-04-23	2017-12-31	13F/A-1	MASTEC	COM	576323109	555,337	100,407	22.07	27,185	28.78	0.0074
2018-02-14	2017-12-31	13F	MASTEC	COM	576323109	555,337	100,407		27,185
2017-11-14	2017-09-30	13F	MASTEC	COM	576323109	454,930	99,271	27.91	21,110	31.45	0.0063
2017-08-11	2017-06-30	13F	MASTEC	COM	576323109	355,659	128,818	56.79	16,059	76.78	0.0049
2017-05-22	2017-03-31	13F/A-1	MASTEC	COM	576323109	226,841	-243,794	-51.80	9,084	-49.54	0.0028
2017-05-12	2017-03-31	13F	MASTEC	COM	576323109	226,841			9,084
2017-02-22	2016-12-31	13F/A-1	MASTEC	COM	576323109	470,635	223,563	90.48	18,003	145.01	0.0059
2017-02-13	2016-12-31	13F	MASTEC	COM	576323109	470,635			18,003
2016-11-10	2016-09-30	13F	MASTEC	COM	576323109	247,072	139,755	130.23	7,348	206.81	0.0025
2016-08-12	2016-06-30	13F	MASTEC	COM	576323109	107,317	-174,958	-61.98	2,395	-58.08	0.0009
2016-05-12	2016-03-31	13F	MASTEC	COM	576323109	282,275	146,308	107.61	5,713	141.67	0.0022
2016-02-09	2015-12-31	13F	MASTEC	COM	576323109	135,967	84,574	164.56	2,364	190.42	0.0009
2016-02-08	2015-09-30	13F/A-1	MASTEC	COM	576323109	51,393	-19,312	-27.31	814	-42.11	0.0003
2015-11-09	2015-09-30	13F	MASTEC	COM	576323109	51,393			814
2015-08-12	2015-06-30	13F	MASTEC	COM	576323109	70,705	-735,856	-91.23	1,406	-90.97	0.0005
2015-05-14	2015-03-31	13F	MASTEC	COM	576323109	806,561	-1,208,516	-59.97	15,567	-65.83	0.0057
2015-02-13	2014-12-31	13F	MASTEC	COM	576323109	2,015,077	1,144,110	131.36	45,561	70.83	0.0167
2014-12-16	2014-09-30	13F/A-1	MASTEC	COM	576323109	870,967	184,223	26.83	26,670	-10.60	0.0103
2014-11-14	2014-09-30	13F	MASTEC	COM	576323109	870,967			26,670
2014-05-13	2014-03-31	13F	MASTEC	COM	576323109	686,744	-218,454	-24.13	29,832	0.73	0.0125
2014-02-13	2013-12-31	13F	MASTEC	COM	576323109	905,198	41,264	4.78	29,617	13.14	0.0126
2013-11-13	2013-09-30	13F	MASTEC INC COM ST	COM	576323109	863,934	369,493	74.73	26,178	60.93	0.0124
2013-08-08	2013-06-30	13F	MASTEC INC COM ST	COM	576323109	494,441	494,441		16,267		0.0082

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.