Find some images of well known company logos (magazines and the internet are good sources) and cut a segment off of each. The hunters must use the segments to identify the logos.
To lead the treasure hunters to the next clue there are two options
1) The first letter from each company name spells out the answer - the order the logos are shown is important for this option.
2) You can simply set a target for the hunters to reach. For example they may have to identify half of the logos to be given the answer.