Insiders will not sell with multiple brokers because they still have to fill a form 4 with the SEC. If they are trying to avoid filling a form 4 they will go to jail. If you do not know what a form 4 is it is a form showing their trades that is made public. Also as far as I can see the supposed dumping is an automatic sale of 3394 shares which is usually done to help pay the taxes on their bonus shares given to them by the company.
If you want to see what a real short attack looks like look at KMI. I doubt there are many shorts in PSEC. But I do think that since PSEC hired a PR firm that they are getting the sheep to buy again. If I were still in this dog I would use this rise to be able to get out. Also I am not short, I am a former shareholder who got out a lot higher than it is now.
When you have capitulation you will have a huge down draft followed by a huge updraft with very large volume. You had the down but not the up. What I do think is going on is that there are some who think they are buying cheap when the stock continues to get cheaper. I would wait till you see the management being changed or they lower fees and announce a share buy back that is substantial with debt repayment. PSEC has to shrink before it can grow again. Another big worry is how low can the stock price go before their loan covenants are called and they have to repay debt or face bankruptcy.