Haycarb PLC is a coconut shell-based activated carbon manufacturing company in Sri Lanka.

The company expanded to the United Kingdom and Australia in 1989 and Indonesia in 2005 with the opening of the PT Mapalus Makawanua Charcoal Industry plant.

[5] A slowdown in gold mining demand, which uses activated carbon, resulted in the under-utilisation of Haycarb's manufacturing facilities in 2015 for three months.

At the time of appointment, Gunawardena was holding several positions including senior legal advisor to Colombo Port City, and a board member of DFCC Bank.

[12] CFA Society Sri Lanka set Haycarb as the subject of its annual research challenge in 2021.

[13] Haycarb ranked 44th in LMD 100, a list of quoted companies in Sri Lanka by revenue in its 2020/21 edition.