[sbisker]

You're doing nothing wrong. At the same time, I wouldn't walk just because they aren't being candid. Usually what this tells you - especially for later-stage startups - is that your options have very little expected value (think a few thousand a year in the best case), and you should act accordingly. Sometimes it's not because HR is full of evil monsters - sometimes it's their way of telling you an unpleasant truth that they aren't allowed to say directly.

Assuming if you're truly ready to walk if they don't share, this could even carry over to your negotiation. At this point, it's just business - if this company is willing to give you $XXk more than a competing offer with more candid numbers, then the cash could be worth it to hedge that risk. Depending, of course, on how much you value the upside.