Yes, we do see shared-compat for 5.5.34:

http://www.percona.com/downloads/Percona-Server-5.5/Percona-Server-5.5.34-rel32.0/RPM/rhel6/x86_64/

and in 5.5.35: 

http://www.percona.com/downloads/Percona-Server-5.5/Percona-Server-5.5.35-rel33.0/RPM/rhel6/x86_64/

but not after that:

http://www.percona.com/downloads/Percona-Server-5.5/Percona-Server-5.5.36-34.1/binary/redhat/6/x86_64/

Also, for my CentOS after recent yum update:

[root@centos openxs]# rpm -qa | grep -i Percona
percona-toolkit-2.2.7-1.noarch
Percona-Server-shared-56-5.6.16-rel64.1.el6.x86_64
Percona-Server-server-56-5.6.16-rel64.1.el6.x86_64
Percona-Server-shared-51-5.1.73-rel14.11.603.rhel6.x86_64
Percona-Server-client-56-5.6.16-rel64.1.el6.x86_64
Percona-Server-devel-56-5.6.16-rel64.1.el6.x86_64
percona-release-0.0-1.x86_64

yum install shows:

[root@centos openxs]# yum install Percona-Server-shared-compat-5.5.35
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
 * base: ftp.colocall.net
 * epel: ftp.colocall.net
 * extras: ftp.colocall.net
 * rpmforge: ftp.colocall.net
 * updates: ftp.colocall.net
Setting up Install Process
No package Percona-Server-shared-compat-5.5.35 available.
Error: Nothing to do
[root@centos openxs]# yum install Percona-Server-shared-compat-5.5.36
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
 * base: ftp.colocall.net
 * epel: ftp.colocall.net
 * extras: ftp.colocall.net
 * rpmforge: ftp.colocall.net
 * updates: ftp.colocall.net
Setting up Install Process
No package Percona-Server-shared-compat-5.5.36 available.
Error: Nothing to do
[root@centos openxs]# yum install Percona-Server-shared-compat-5.5.34
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
 * base: ftp.colocall.net
 * epel: ftp.colocall.net
 * extras: ftp.colocall.net
 * rpmforge: ftp.colocall.net
 * updates: ftp.colocall.net
Setting up Install Process
No package Percona-Server-shared-compat-5.5.34 available.
Error: Nothing to do

We have only this available:

[root@centos openxs]# yum install Percona-Server-shared-compat
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
 * base: ftp.colocall.net
 * epel: ftp.colocall.net
 * extras: ftp.colocall.net
 * rpmforge: ftp.colocall.net
 * updates: ftp.colocall.net
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package Percona-Server-shared-compat.x86_64 0:5.1.68-rel14.6.551.rhel6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                       Arch    Version                   Repository
                                                                           Size
================================================================================
Installing:
 Percona-Server-shared-compat  x86_64  5.1.68-rel14.6.551.rhel6  percona  3.8 M

Transaction Summary
================================================================================
Install       1 Package(s)

Total download size: 3.8 M
Installed size: 11 M
Is this ok [y/N]: n
Exiting on user Command

but nothing more:

[root@centos openxs]# yum install Percona-Server-shared-compat-55
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
 * base: ftp.colocall.net
 * epel: ftp.colocall.net
 * extras: ftp.colocall.net
 * rpmforge: ftp.colocall.net
 * updates: ftp.colocall.net
Setting up Install Process
No package Percona-Server-shared-compat-55 available.
Error: Nothing to do
[root@centos openxs]# yum install Percona-Server-shared-compat-56
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
 * base: ftp.colocall.net
 * epel: ftp.colocall.net
 * extras: ftp.colocall.net
 * rpmforge: ftp.colocall.net
 * updates: ftp.colocall.net
Setting up Install Process
No package Percona-Server-shared-compat-56 available.
Error: Nothing to do

...