For Epoch 314, in the total 500 ranked stakepools, 347 are multipools and 153 are single stakepools. Within the first 10 ranked stakepools, 9 are multipools. Within the first 100 ranked pools, 86 are multipools and 14 singlepools.
Further reading for newer members about the k500 parameter, staking and so on, here on the IOG Blogpost from Chief Scientist Aggelos Kiayias: The general perspective on staking in Cardano - IOHK Blog
And for the total distribution of stake, not only on the k500 pools, further statistics here: Group Single Pool Operators | Cardano Staking / Explorer