Business as usual.
The stock has formed two days bearish reversal pattern - bearish engulfing - just under the upper border of mt-downtrend (read old posts) - standard downwards 'border reaction'.
From the FA point of views, one dimension is just a tax-issue --> after corp. tax cut in the states (from 35% to just 21%) the stock should become less attractive for the 'states investors'. Though, they may have 'another opinion'.... just at the moment (they may reconsider it just later on).
The matter is that 'asml' (as well as a number of other 'tech companies') was really attractive for 'investors'. Indeed, at just 'usual tax-rates' of 25% in the NL (for the 'average' NL-company, contrary to 35% in the states), the firm had a very special 'tax advantage' paying just ~(1-5)% until 2014 (read old posts). And even if paying ~14% in 2017, the firm was still more than 'twice' more efficient 'cash machine' relatively to an average states' company.
However, the current 14% tax-rates (in the NL) become just a bit less attractive relatively to (new) 21% tax-rates in the states, isn't it ? Moreover, taking into account that current 14% may/should grow up (as it's happened since 2010-2014) to standard tax-rates of 25% in the NL, the stock's "attractiveness" would deteriorate further essentially.
That's just 'one dimension'. There are also other 'fundamental dimensions' and consequences (for instance, cheaper dollars, etc.) that states' investors should account (and most likely they'll really do) for.
Just take care.
PS. Following hypothesis of 'market efficiency', all 'fundamental info' (known at the moment) is just 'priced in' the current price dynamics (though, it's not formally proved yet).