Looks like the PBM stocks are now taking a downward move . Express Scripts’ stock (ESRX) is under pressure partly following some comments from a short-seller in Barrons. Meanwhile, Medco (MHS)continues upwards. Some of this is probably caused by institutions re-allocating their PBM portfolio. Medco has added about a billion in market cap since it started trading last week, and is now finally worth a little more than what Merck paid for it back in 1994–not bad when you condsider that PCS (ADVP) has still not come close to being worth the $4 billion Eli Lilly paid McKesson for it back then!