Lone Pine Capital 13F: New $556M Stake in MasTec (MTZ)

Lone Pine Capital Takes New Position in MasTec

In its recent Form 13F filing with the SEC covering holdings as of May 15, 2026, Lone Pine Capital reported a brand-new position in infrastructure engineering and construction firm MasTec, Inc. (NYSE:MTZ). The fund bought 1,531,050 shares, establishing a fresh stake valued at roughly $555.7 million. Because this is a backward-looking regulatory disclosure, the filing reflects holdings at that point in time and may not represent the fund's current position today.

Inside Lone Pine Capital's New Stake

Lone Pine Capital initiated the investment by acquiring 1,531,050 shares of MasTec. The position went from zero shares to 1,531,050 shares, with a reported cost basis of $270.64 per share. This new buy brings a substantial block of shares into the fund's portfolio.

MasTec Stock Performance and Valuation

MasTec shares change hands at $362.97. The stock has traded between a 52-week low of $182.34 and a 52-week high of $441.43. The company has a market capitalization of roughly $17.9 billion, a P/E ratio of 35.5, and a forward P/E of 17.8. Its 50-day moving average sits at $277.10, while its 200-day moving average is $305.67.

Analysts Set New Price Targets

Wall Street firms have active views on the stock's trajectory. On October 15, 2026, Keybanc maintained its Overweight rating while lowering its price target to $320.00 from $371.00. Earlier, on October 8, 2026, Stifel kept a Buy rating and lowered its target to $305.00 from $376.00. Truist Securities maintained a Buy rating with a $380.00 target on October 5, 2026, and TD Cowen maintained a Buy rating with a $320.00 target on the same day. Piper Sandler maintained an Overweight rating at $313.00 on September 28, 2026, following an earlier initiation at $321.00 on September 9, 2026. Goldman Sachs kept a Buy rating at $409.00 on August 12, 2026, and UBS maintained a Buy rating at $410.00 on August 4, 2026. Overall, the stock carries a consensus strong buy rating with a mean target price of $413.80 across 20 analyst opinions.

What MasTec Does

MasTec builds and maintains vital infrastructure across North America, handling projects for communications, clean energy, power delivery, and pipeline systems. The company constructs renewable energy generation facilities, wireless and fiber optic networks, electrical transmission grids, and heavy civil infrastructure like roads and bridges. It serves a broad customer base that includes major telecom providers, public utilities, private energy companies, and government agencies.

What to Watch at MTZ

Investors tracking Lone Pine Capital will wait for future quarterly 13F filings to see if the fund adjusts its exposure to MasTec. Meanwhile, the company's next earnings report is scheduled for October 29, 2026, which will provide fresh data on revenue growth and profit margins.