To say it has been a tough couple of days for anyone connected to Boeing (BA) would be an understatement.  In terms of the company’s stock, the last two days have seen the first back to back declines of 5%+ in close to a decade (June 2009).  As a result of this week’s decline, BA has lost its perch at the top of the DJIA in terms of best performers YTD, now coming in at number six.  That being said, the stock is still up over 17% on the year, and because of the DJIA’s unique way of weighting components by their share price rather than market cap, BA has still been the largest contributor to the DJIA’s YTD gains. Even more amazing? It’s still not even close.

The chart below shows the YTD attribution of each of the DJIA’s 30 components to the index’s total gain YTD.  Accounting for still more than 15% of the DJIA’s YTD gain, BA has had nearly twice the YTD impact on the DJIA so far this year as the next closest stock (Goldman Sachs – +8.7%).  The fact that BA still has had such an outsized impact on the DJIA even after its big decline this week shows not only how extreme its move higher to kick off the year was, but also how odd it is to weight a stock index by an arbitrary measure like each component’s share price.  One final note — it was somewhat ironic to see that the one stock that has had the most negative impact on the DJIA YTD is also the index’s newest component: Walgreen’s Boots Alliance (WBA) added last June.



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