I trying to correct this sentence.

Most stockholders favored the merger, the management did not.

I know this is a comma splice sentence

You can either put "but" after the comma or you can replace the comma with a semicolon.

To correct the comma splice sentence, you have a couple of options:

1. Replace the comma with a coordinating conjunction (such as "but") to connect the two independent clauses:
Most stockholders favored the merger, but the management did not.

2. Convert the sentence into two separate sentences:
Most stockholders favored the merger. The management did not.

Both options ensure that each independent clause is properly separated and makes the sentence grammatically correct.