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Reddit wants to raise $748M with IPO, sets value at $6.4B
(go.theregister.com)
This is a most excellent place for technology news and articles.
Face value is unlikely to be the amount reported - I doubt the options are granted below the last reported market rate. Hence it's probably relative to the amount of underlying stock the options represent.
You'd have to check the SEC-filings for more accuracy than that.