This list of California companies includes notable companies that are, or once were, headquartered in California.

Companies based in California

0–9

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

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U

V

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X

Y

Z

Companies formerly based in California

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

R

S

T

U

V

W

X