In order to preserve, to the extent possible, the contract value (strike price*number of underlying shares) of an option or future OMX Derivatives Markets adjusts stock options and futures for reverse splits by multiplying the original strike price with an adjustment factor and dividing the original contract base (number of underlying shares) with the same factor.
As there was a 1:5 reverse split (every five shares held becomes one share) in Ericsson the adjustment factor was 5 and the strike price after adjustment thereby was five times higher while the number of underlyings became a fifth of its original size. By performing this adjustment the total value of the option/future was unchanged.
After the change, effected series end with an 'X', e.g. "ERICB8F75X"
Example: Call Option Ericsson B
Before Adjustment Strike price 20 Contract size 100 Total value 20*100=2000
After Adjustment Strike price 100 Contract size 20 Total value 100*20=2000
