Transistor according to EN 60617-2
It seems a few things are coming together...

a) wrong part of the standard

I have bought EN 60617-2, just for finding out that the transistor is not listed. Part 2 only covers "symbol elements, qualifying symbols and other symbols having general application", which does not include the transistor.

The symbols listed in my part of the standard all have numbers in the form 02-xx-xx, so I assume that 02 refers to part 2 of the standard. 

When you read on in this answer, you'll find that the transistors have 05-xx-xx. This would match the title of part 5, which is "symbols for semiconductors and electric tubes", so only EN 60617-5 could be an authorative reference.

b) symbols on Wikipedia

First, only for some symbols, the reference to EN 60617 is mentioned, e.g. for the LED, which has the symbol number 05-03-02:



For the transistor, such a hint is not present, which is a first indicator that it is possibly not an EN 60617 symbol:



Instead, it's likely a symbol of the former standard DIN 40900.

c) the correct symbol

In the comments, The Photon pointed out that in a reference manual, the NPN transistor has symbol number 05-05-02 and the PNP transistor 05-05-01:



As pointed out by brhans in the comments already, the latter only has a circle, because the housing is connected to the collector, otherwise it would be omitted as well.

This would also match the Wikipedia entry for Transistor which uses the symbols



for NPN transistor and 



for PNP transistor, unfortunately without mentioning where that symbol comes from.