Current position

George Soros’s Mastec Inc (MTZ) position

Reported position history, portfolio importance and verified filing changes from public SEC disclosures.

Soros Fund ManagementVerified through Q2 2026
Relationship snapshot

At a glance

The full verified relationship, including prior ownership episodes and exits where supported.

First reportedQ1 2000Earliest verified positive filing snapshot
Latest statusCurrent positionBased on the latest supported relationship state
Peak shares84.00KHighest verified quarter-end share count
Quarters reported11Verified quarters with shares above zero
What happened?

Soros Fund Management first reported Mastec Inc in Q1 2000. After an earlier exit, the position later appeared again in a verified filing. The reported position was increased and reduced across later filings. Soros Fund Management currently reports 8.28K shares. The latest verified filing showed: Bought 110.5% more.

Verified SEC history

Position over time

See the same verified relationship through reported shares, portfolio weight or reported value.

Metric

Gaps indicate periods that cannot be safely connected or where a verified corporate action changes the raw share scale. Stock price, when available, is market context and not a transaction price.

Key filing events

What changed

Latest filing plus the most meaningful reported changes. Unchanged quarters are collapsed by default.

Q2 2026
Bought 110.5% more+4.34K shares · 8.28K shares reported after the change
Filing context

Quarter-end price $416.06 · Estimated holding basis $321.67

Q1 2026
Sold 73.3% of the position−10.77K shares · 3.93K shares remained
Filing context

Quarter-end price $321.74 · Estimated holding basis $217.37

Q4 2025
New position+14.70K shares · 14.70K shares reported
Filing context

Quarter-end price $217.37 · Estimated holding basis $217.37

Q2 2011
Sold the entire position−14.30K shares · No shares reported at quarter-end
Q1 2011
Bought 11.7% more+1.50K shares · 14.30K shares reported after the change
Filing context

Quarter-end price $20.77 · Estimated holding basis $12.15

Q4 2010
Bought 24.3% more+2.50K shares · 12.80K shares reported after the change
Filing context

Quarter-end price $14.61 · Estimated holding basis $11.13

Portfolio importance

How important is Mastec Inc in Soros Fund Management’s reported portfolio?

Relative importance is measured only within the verified primary non-option reported portfolio for each quarter.

Current portfolio weight0.0%Q2 2026
Current rank#181of 254 reported positions
Peak portfolio weight0.1%Q2 2000
Best historical rank#132Q2 2000
At peak importanceQ2 2000
MTZ
0.1%
Largest holding
5.5%
Cross-investor discovery

Who else owns Mastec Inc?

Also reported by 3 other tracked investors in their latest verified filings.

Daniel LoebThird Point LLC
MTZ2.6% of reported portfolio
Joel GreenblattGotham Asset Management
MTZ0.1% of reported portfolio
Ray DalioBridgewater Associates, LP
MTZ0.0% of reported portfolio
Explore Mastec Inc across all tracked investors →
SEC evidence & methodology

SEC filing evidence

Market context and filing-derived values are kept separate from actual transaction prices, which 13F filings do not disclose.

Latest verified stock price$214.382026-09-18

Market context only; not an investor transaction price.

Latest filing quarter-end price$416.06Q2 2026

Derived from validated reported value and shares where supported.

Estimated holding basis$321.67Historical reference — not actual purchase price

Calculated from supported filing history.

Latest verified investor filingQ2 2026 · filed 2026-08-14
Open SEC filing ↗

This tracker follows Soros Fund Management LLC’s Form 13F disclosures—not George Soros’s personal brokerage account. George Soros founded the firm; its current CEO and chief investment officer is Dawn Fitzpatrick. Form 13F does not reveal exact trade dates, execution prices or the purpose of an option position.