On the week end (that is when players tend to sell what they got during the week) around Feb 11, someone dumped a massive amount of isotopes, I guesstimate about 100B worth of stock in 3 days, each day volume double than usual.
He probably ignored that a GoonSwarm related corporation called Bat Country (kill board) had recently started a Nitrogen Isotopes interdiction campaign. I promptly started posting about such campaign both in a thread in the Crime and Punishment forum and in another in General Discussion. At the same time I went to check the ice mining systems in The Forge and noticed them almost empty.
In few days price pushed through TP1 and then hit TP 2.
Capital at the beginning of the operation: 10.08B, 20M units bought at 504.
Half sold at 600 ISK (look at how many did that, the February 18 bar shadow is very big) for a total of 6B.
Half sold at 648 ISK, for a total of 6.48B.
Profit (excluding fees) is about 6 + 6.48 – 10.08 = 2.4B.
This means, the capital increased by about 23% in about one month, with 1 trading operation.