The top holder of BC is actually moving it out. You can see the decrease. If he/she is dumping, the price will fall even more.
Address B6WWCjPVGt3PGdW8wyjDvtPLSSDGxBDHBe
9a39a88d1f... 10768 2014-03-02 08:27:00 (80000.0033) 4350003.5222 BC
7d8ca5e3c5... 11064 2014-03-02 13:36:06 (50000.0143) 4300003.5079 BC
23fdbef853... 11351 2014-03-02 18:40:29 (50000.0011) 4250003.5068 BC
65dd88aca0... 11739 2014-03-03 01:30:12 (109999.9999) 4140003.5069 BC
a28d4aad73... 12236 2014-03-03 10:21:45 (140000.0027) 4000003.5042 BC
f7670faf5d... 12447 2014-03-03 14:05:46 (250000.2117) 3750003.2925 BC
4c62a7f6b4... 12750 2014-03-03 19:28:16 (50000.0008) 3700003.2917 BC
affe78bf58... 12876 2014-03-03 21:45:33 (70000.0232) 3630003.2685 BC
Isn't it possible that, as someone said previously in this thread, the top few are just the exchanges?