Citi upgrade, page-24

Custodians do it. Which is ironic because the definition of a custodian is: "a person who has responsibility for taking care of or protecting something". Any holder with "nominees" in the name is a 'custodian'. And guess what, the Top 5 are all custodians:

From the Top 20 in the last annual report:

1 J P MORGAN NOMINEES AUSTRALIA LIMITED 38,567,379 18.411%
2 HSBC CUSTODY NOMINEES (AUSTRALIA) LIMITED 37,248,556 17.781%
3 NATIONAL NOMINEES LIMITED 15,101,562 7.209%
4 CITICORP NOMINEES PTY LIMITED 13,568,289 6.477%
5 HSBC CUSTODY NOMINEES (AUSTRALIA) LIMITED - A/C 2 9,816,131 4.686%

They would be your cuplrits, in my humble opinion. I used to work for the one of the custodians listed above (in IT, never on the business side). They get paid a fee to loan out stock for corporate activities, one of which is shorting. I've always thought there was a possible conflict of interest there. On the one hand they hold stock for shareholders trying to maximise value, on the other they loan it out for shorting.