Nowadays bitcoin market cap is
155Bln, and was more a few weeks ago
400Mln represents
0.26% of it
It didn't has much impact on the price
That is simple and effective mathematic logic...
It doesn't have much impact because the amount is so small in percentage but imo it's still a fairly decent amount that they could use to influence others and manipulate the price once they continue their 120,000 btc dump on September. If spoofy has this kind of amount who knows what he could do with the price of bitcoin.
Mt. Gox is going to kill bitcoin this year. 166,000 Bitcoin that will crash bitcoin to the bottom
Bitcoin still has 6 months of preparation for this dump, expecting bitcoin's price go to the bottom is too much .