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King

a person or thing preeminent in its class:  "the king of actors."

"IBM used to be the king of the IT industry"

Or use queen when the need arises.

Boss

One who makes important decisions or exercises authority.

"IBM used to be the boss of the IT industry"

Top Gun

the most important or powerful person in a particular sphere; the top-ranked person in a group.

"IBM used to be the top gun of the IT industry"

"IBM used to be the king/boss/top-gun of the IT industry"

King (or queen, if preferred) — TFD

a person or thing preeminent in its class:  "the king of actors."

Boss — TFD

One who makes important decisions or exercises authority.

Top Gun — Dictionary.com

the most important or powerful person in a particular sphere; the top-ranked person in a group.

King

a person or thing preeminent in its class: "the king of actors."

"IBM used to be the king of the IT industry"

Or use queen when the need arises.

Boss

One who makes important decisions or exercises authority.

"IBM used to be the boss of the IT industry"

King

a person or thing preeminent in its class: "the king of actors."

"IBM used to be the king of the IT industry"

Or use queen when the need arises.

Boss

One who makes important decisions or exercises authority.

"IBM used to be the boss of the IT industry"

Top Gun

the most important or powerful person in a particular sphere; the top-ranked person in a group.

"IBM used to be the top gun of the IT industry"

King

a person or thing preeminent in its class: "the king of actors."

"IBM used to be the king of the IT industry"

Boss

One who makes important decisions or exercises authority.

"IBM used to be the boss of the IT industry"

King

a person or thing preeminent in its class: "the king of actors."

"IBM used to be the king of the IT industry"

Or use queen when the need arises.

Boss

One who makes important decisions or exercises authority.

"IBM used to be the boss of the IT industry"