Pattern of Behaviour

What is it about these stocks that shows such strong correlation in their performance for the past few years?  They are definitely not in the same type of business.

Steady and Rising

• Adampak - Label manufacturing (http://www.adampak.com.sg/)
• Cerebos - Brand's (http://www.cerebos.com/)
• Hour Glass - Branded watches and stuff (http://www.thehourglass.com/)
• Hsu Fu Chi - Food (http://www.hsufuchifoods.com/ - website is quite hopeless!)
• M1 - Telco (http://www.m1.com.sg/)

Steady and Volatile Rising

• CSE Global - Software business, especially for the Oil & Gas industry (http://www.cse.com.sg/)
• Innotek - Component manufacturing (http://www.innotek.com.sg/)
• Kian Ann - Construction - Heavy machinery and diesel engine distributor (http://www.kianann.com.sg/)
• SingPost - Postal/logistics services, property/rental (http://www.singpost.com.sg/)
• Sing Inv & Fin - Finance (http://www.sif.com.sg/)
• Teckwah - Printing, packaging and supply-chain (http://www.teckwah.com.sg/)
• Zagro Asia - Animal and crop bio-medical (http://www.zagro.com/)