Including transaction fees, I had originally been paid $8.12 / share for 200-strike call options expiring on September 21, 2018 when Berkshire was trading for $196.48 / share.
Today, with the shares trading for $207.25 or so, the 200-strike call options were trading for $8.65 / share.
This suggests that I will have made ($207.25 – $196.48 =) $10.77 on the shares and, buying back the calls, would only loose ($8.12 – $8.65 =) $0.53. In other words, I would be able to close the position for a gain of ($10.77 – $0.53 =) $10.24 / share — over two dollars more than I had originally sold the calls for!
With this realization, I closed my two-contract position, pocketing about $400 more than I had originally expected.
Berkshire is trading between the $200 and $210 strike prices, and pricing on the $210 puts expiring in December is not as good as I got before, so I’d rather look for better pricing before extending this covered call transaction in the form of a short put.