Then by that same logic, can't the LPs just leak slightly modified number so they're not identified?

You monster

Not a bad idea, except that it's illegal. If they invest on your phony numbers then they can sue you later for lying to them.

you never met a lawyer.

send notice to LP #1. subtract value from sending that note. send new value on a note to lp #2. subtract cost... put a note on all notes that they may be an hour out of date but represent the values as accurately as the law demands for that day.

Even if only a few cents?

What if you give everyone the same numbers in a different order? Or one spelling mistake in each release?

Those other options would probably be more legal but less likely to "propagate" to the leak.

"Number watermarking" is a very good solution against many different kinds of leaks. I wonder whether there exist services for big companies to "watermark" internal documents with very insignificant errors.