C. Robert Campbell

C. Robert Campbell: Director at MasTec. What C. Robert Campbell holds in an AI or semiconductor company tracked on Silicon Floor, from their SEC filings, broken down: the shares held and how, then any restricted shares, options or other rights declared.

MasTec (MTZ)

C. Robert Campbell holds 30,880 MasTec shares (0.04% of the company), worth about $6.4M at the last price, according to the Form 4 of Aug 14, 2026.

Declarations

Sources: SEC Schedules 13D and 13G (stakes above 5%, which count everything a person votes or can acquire within 60 days) and Forms 3, 4 and 5 (the shares a director, officer or 10% owner holds, filed within two business days of each trade). Values at the last price.

All holders · Who owns each AI company · All tracked companies · The AI market