# MASTEC INC COM

MASTEC INC COM is a security (CUSIP 576323109) tracked across SEC portfolio filings. 883 institutional managers reported $17.9B on Form 13F as of 2026-06-30; 55 registered fund positions totaling $1.2B via N-PORT as of 2026-05-31.

## Summary

- Issuer: MASTEC INC
- Class: COM
- CUSIP: 576323109
- Asset category: EC
- 13F holders: 883
- 13F value: $17.9B
- 13F period: 2026-06-30
- N-PORT fund positions: 55
- N-PORT value: $1.2B
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 883 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BlackRock, Inc. | New York, NY | $2.4B | 7,309,609 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $1.3B | 5,932,754 |
| [PECONIC PARTNERS LLC](https://search.stillhousedata.com/firm/108857) | NEW YORK, NY | $1.2B | 3,578,431 |
| [Hill City Capital, LP](https://search.stillhousedata.com/firm/306709) | BOSTON, MA | $693.3M | 2,155,000 |
| STATE STREET CORP | BOSTON, MA | $601.6M | 1,869,788 |
| VICTORY CAPITAL MANAGEMENT INC | San Antonio, TX | $512.4M | 1,592,523 |
| [LONE PINE CAPITAL LLC](https://search.stillhousedata.com/firm/156602) | Greenwich, CT | $492.6M | 1,531,050 |
| FIRST TRUST ADVISORS LP | Wheaton, IL | $454.2M | 1,411,584 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $441.5M | 1,371,909 |
| BANK OF AMERICA CORP /DE/ | CHARLOTTE, NC | $427.9M | 1,330,066 |
| Hood River Capital Management LLC | PALM BEACH GARDENS, FL | $416.8M | 1,295,385 |
| Bank of New York Mellon Corp | NEW YORK, NY | $280.5M | 674,288 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $235.3M | 731,650 |
| [Electron Capital Partners, LLC](https://search.stillhousedata.com/firm/166102) | NEW YORK, NY | $229.4M | 713,013 |
| NORDEA INVESTMENT MANAGEMENT AB | STOCKHOLM, V7 | $225.5M | 529,463 |

## Top fund holders (N-PORT)

_Showing 15 of 55 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| State Street SPDR S&P MidCap 400SM ETF Trust | SPDR S&P MIDCAP 400 ETF TRUST | $595.0M | 245.68% |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $220.2M | 27.02% |
| [Fidelity Trend Fund](https://search.stillhousedata.com/fund/S000007496) | Fidelity Trend Fund | $46.4M | 112.08% |
| [Columbia Acorn Fund](https://search.stillhousedata.com/fund/S000009184) | COLUMBIA ACORN TRUST | $42.2M | 187.96% |
| [VANGUARD STRATEGIC EQUITY FUND](https://search.stillhousedata.com/fund/S000002593) | VANGUARD HORIZON FUNDS | $37.9M | 37.48% |
| [LORD ABBETT DEVELOPING GROWTH FUND INC](https://search.stillhousedata.com/fund/S000006834) | LORD ABBETT DEVELOPING GROWTH FUND, INC. | $34.9M | 157.29% |
| [PGIM Jennison Natural Resources Fund](https://search.stillhousedata.com/fund/S000004515) | Prudential Jennison Natural Resources Fund, Inc. | $34.3M | 341.29% |
| NXG NextGen Infrastructure Income Fund | NXG NextGen Infrastructure Income Fund | $21.9M | 475.45% |
| [Columbia Mid Cap Index Fund](https://search.stillhousedata.com/fund/S000010826) | COLUMBIA FUNDS SERIES TRUST | $16.6M | 65.24% |
| [FPA Queens Road Small Cap Value Fund](https://search.stillhousedata.com/fund/S000004901) | Bragg Capital Trust | $15.9M | 329.25% |
| Tortoise Energy Infrastructure Corp | Tortoise Energy Infrastructure Corp | $12.8M | 129.33% |
| [Large Cap Index Master Portfolio](https://search.stillhousedata.com/fund/S000033023) | Master Investment Portfolio | $11.8M | 3.26% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $11.5M | 1.95% |
| [BNY Mellon Midcap Index Fund, Inc.](https://search.stillhousedata.com/fund/S000000078) | BNY MELLON MIDCAP INDEX FUND, INC. | $9.7M | 70.14% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $9.7M | 3.22% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/576323109.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.