Reinvest...before/on/after the day?12 Apr 2018 13:09
I thought that the analysis of whether to invest before, on, or after the day would be so interesting that I decided to take the morning out and do it myself.
Extremely interesting in that yet again the numbers when crunched show instinct to be not necessarily correct! (Well not my instinct at least.)
Just a quick description of what I did ... got the GSK dividend dates and data for the last two years, got the GSK and FTSE-100 OHLC data for the period. Averaged the OHLC to remove the worst of the daily swings. Used the 5 day average from D-15 to D-10 (where D is the dividend date) as the basis for comparisons. Used the FTSE100 to remove market variations from the GSK price.
General conclusion ... It's not worth buying in the 2-3 weeks leading up to the dividend payment date as the price seems to generally decline after the day. For the last 6/7 dividend payments you would have been significantly better off buying _after_ the payment date than on it.
Now the results, with the systemic market movements removed. Assuming you bought 15 trading days after the dividend payment the price you would have paid relative to the price on the actual dividend date would be:
Jan 18 -0.36%
Oct 17 -11.05%
Jul 17 -6.14%
Apr 17 -2.76%
Jan 17 +0.87%
Oct 16 -5.20%
Jul 16 +1.99%
So some of the reductions/savings are very significant ... on the contrary side, the increases are very small ... so overall, if you are going to reinvest in GSK then doing it 15 days after the dividend is paid seems like a good ploy.
BUT ... as always with these number based strategies ... they can go wrong, (some times seriously wrong) ... so do your own research, make your own choices ... and don't blame me for anything!
Mike
Jan 18