Transferred Lenders

[lrivas4541]

I have about 115k in student loan debt. What I have noticed is that the lenders frequently sell the debt to other lenders. Then they say: "transferred, closed" or something along those lines. All of these accounts are still in deferment and none of them are negative. Do these sold items all stay on my credit report? Does it harm my report/score at all if companies continue to sell my debt? It seems really silly to have more than 1 account listed for each debt I owe. Can someone please explain this? I have also noticed the same thing with a few of my credit cards, especially with collections accounts.