[1] 41% is average ratio from here: https://www.capshare.com/blog/409a-valuation-guide/
Fwiw capital loss can only be applied to offset capital gains, other than 3k/year.
0.27 strike price was the 409A valuation at the time that the options were issued. There is usually another 409A valuation after the funding round. But we don't know what that value is. You can speculate, but using the funding round as the amount is wrong.
The question I was asking was: does any lender do this as a matter of policy as opposed to one-offs? The answer appears to be yes - Silicon Valley Bank appears to have let customers collateralize loans with private shares.
As for Silicon Valley Bank... They're serving the needs of the individuals around them. It's definitely not a common thing, and you're probably not getting anything close to a car or mortgage interest rate. (But still probably better than an unsecured loan.)
From their own copy: [0]
> Our tailored lending solutions can help you unlock the value of your private assets and simplify your financial life—in a way many traditional banks can't or won't.
[0] https://www.svb.com/private-equity-venture-capital/private-b...
I normally don't comment on HN without having read TFA, but this one is way too long and I just skimmed over it. I think OP not exercising their options is more about getting feelings in the way of a financial decision. A 4.8MM valuation is really cheap. And it's not like exercising would incur a huge amount of taxes.