-

The expression tends to assimilate the big companies to octopus trying to embrace everything. The word for "pulpos" used in Latin American countries in contexts like the one you mention is "octopus"

It's in the line with octopus. Octopuses have suckers

--------------------------------------------------
Note added at 13 mins (2012-01-09 11:59:21 GMT)
--------------------------------------------------

1. One that sucks, especially an unweaned domestic animal.
2. Informal
a. One who is easily deceived; a dupe.
b. One that is indiscriminately attracted to something specified: "The nation's capital is a sucker for a symbolic gesture" (Jonathan Alter).
3. Slang
a. An unspecified thing. Used as a generalized term of reference, often as an intensive: "our goal of getting that sucker on the air before old age took the both of us" (Linda Ellerbee).
b. A person. Used as a generalized term of reference, often as an intensive: He's a mean sucker.
4. A lollipop.
5.
a. A piston or piston valve, as in a suction pump or syringe.
b. A tube or pipe, such as a siphon, through which something is sucked.
6. Any of numerous chiefly North American freshwater fishes of the family Catostomidae, having a toothless jaw and a thick-lipped mouth adapted for feeding by suction.
7. Zoology An organ or other structure adapted for sucking nourishment or for clinging to objects by suction.
8. Botany A secondary shoot produced from the base or roots of a woody plant that gives rise to a new plant.

--------------------------------------------------
Note added at 14 mins (2012-01-09 12:00:47 GMT)
--------------------------------------------------

Definitions 2a and 7 might serve your purpose.

"Pulpo" es otra manera de llamar a las "empresas tiburón"

http://diccionario.reverso.net/ingles-espanol/ram raider

From the Oxford English:

shark2
■ noun informal
a person who exploits or swindles others.

From the Oxford Spanish-English:

C (Chile familiar) (explotador) shark (familiar)

HTH