But, the previous sentence bothers me more: how can it be a company geared to make money but... please not so much as being speculative (I guess making too much money).
Good luck.

In English there is less emphasis on the 'obligation' - after all, it's a legal document which necessarily implies rights and obligations. It's sufficient to state the purpose: 'for their mutual benefit'.

The first alternative seems the most faithful to the source text, but it may be a bit antiquated (a good number of the 2660 webpages I found on Google containing "mutually binding themselves" seem to refer to historical documents from the 1700's and 1800's, though there are some modern-looking ones in there too). The second alternative seems like it would fit the end of the sentence and might be a more modern alternative.