These are my own sums, and I welcome any corrections or alternative views.
Currently, I hold just KMRW; no KMR; but I will trade either short-term as well as maintaining/increasing my long-term holding.
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As the shares move up, the warrants should out-perform the shares just by keeping (more or less) at-the-money, ie:
now:
KMR = 40
KMRW = 24 (KMRW out of the money since 24+19=43)
future:
KMR = 60
KMRW (if it comes up to at-the-money price) = 60-19 = 41
% gains:
KMR = (60-40)/40 = 50%
KMRW = (41-24)/24 = 70%
That's a modest outperformance of the warrants; but they don't expire until 2009, so there's plenty of scope for greater gains.
if:
KMR = 100
KMRW (if it comes up to at-the-money price) = 100-19 = 81
% gains:
KMR = (100-40)/40 = 150%
KMRW = (81-24)/24 = 237%
At some stage before expiry, I expect to sell enough of my KMRW to exercise the rest, leaving me with a decent chunk of shares.
100,000 KMRW, price 81p = value = £81,000
exercise cost = 100,000 x 19p = £19,000
number of KMRW to sell meet exercise cost of remainder = 19,000 (as it happens)
...leaving me with 81,000 KMR, price 100p = value £81,000
ie. converted KMRW to KMR at no cost, and avoiding the expiry of KMRW. The extra % gains get manifested as a larger number of KMR shares.
Of course there is no guarantee that KMRW will tend to remain at-the-money; it could do better, ie. give greater % gains.
The chart shows graphically how the warrants can outperform the shares
And this one shows the moves happen down as well as up
edit 20jan08: PYF/W chart no longer shows what I intended