STO closest to the pin, page-103

There's a $0.20 disconnect between the STO price and the STOR price.

That's the "up-side potential premium". We're looking at a $3.85 short-dated call option. The $0.20 is your odds on the STO price rising high enough in the next two weeks to make the rights worth exercising if you buy them now.

Don't kid yourselves. It won't happen. The price will hover now at near $3.85 until the shortfall bookbuild is completed. In the last week or so before the bookbuild, it will fall below $3.85 far enough for the VWAP on STO to not exceed $3.85 (or at least by not very much). The shortfall bookbuild will return you no more than a handful of cents per unit of STOR if you get anything at all.

Following the bookbuild the price may rebound, climb slowly, or continue downward depending on sentiment and market conditions.

My recommendations (for what they're worth) for run-of-the-mill retail investors are:
1) Only buy STOR if you plan to exercise them.
2) Take a long term view of STO before you decide, the short term is full of silt from all the turbulence.
3) Buying STO avoids paying the premium you'd pay for STOR.
4) Buying STO has a lower risk associated. Buying STOR can leave you with nothing from your investment.

For what it's worth...