Starting in July, all adults in their 50s, school teachers and high school seniors will be eligible for their first Covid-19 shots, which will be expanded to everyone over 17 from August.
Sales fell slightly and net profit jumped 40 percent on year in the third quarter for listed companies.
Hanwha reported a drop in sales but a rise in profit.
Emart reported improved earnings in the third quarter, with operating profit jumping 30 percent on year. But its online operation remained in the red.
CJ CheilJedang reported more than a thousand percent jump in consolidated on-year net profit in the third quarter on improved business.
Hanwha Systems, provider of IT infrastructure, electronics and aerospace technology for defense, reported a net profit increase of 47.8 percent on year to 31.33 billion won ($28 million) during the the third quarter.
KT attributed a drop in its third-quarter operating profit to increased labor costs as the company announced its latest earnings report Friday.
Korean Air Lines swung to net loss in the third quarter as travel demand continued to remain sluggish due to Covid-19 travel restrictions.
Hyundai Heavy Industries Holdings swung to a net profit on quarter in the third quarter, but saw its earnings decline almost 50 percent on year, reported the company in a regulatory filing on Friday.
Amorepacific Group's net profit plummeted 93.7 percent on year to 7 billion won ($6.2 million) in the third quarter