On Monday, Royal Ceramics Plc, a unit of listed Vallibel One Plc in which Perera owns 63.5 percent, bought a 79 percent stake in Lanka Ceramics from listed Ceylon Theatres group for 2.9 billion rupees.
In addition to Lanka Ceramics, the holding company, the acquisition brought in operating units, Lanka Walltiles, Lanka Tiles, Swisstek, an aluminum company and Horana Plantations, a tea estate.
"We now have a monopoly in ceramic tiles and aluminum industries," Perera said.
Sri Lanka's listed Hayleys group in which Perera owns 44 percent gained control of an unlisted aluminum extrusion firm Alumex, in 2010 for 2.1 billion rupees. Hayleys said at the time it had a 55 percent market share.
Perera personally owns a 29 percent stake in Lanka Alluminium, another listed company.
Royal Ceramics also owns the country's only sanitary wear producer, which is unlisted.
Perera said Horana Plantations would be a strategic fit with Talawakele and Kelani Valley Plantations of the Hayleys group.
Perera said he now had control of 28 out of 280 odd listed companies in the market.
Vallibel One has seven listed companies under its umbrella with the latest acquisitions and Hayleys group nine.
Perera also controls Vallibel Finance and Vallibel Power Erathne.
Among the more widely known material stakes in listed companies include Fortress Resorts, Pan Asia Bank and Sampath Bank.
He also owns stakes in unlisted companies in power generation and gaming.