Here is Top 20 S&P 500 winners in the third-quarter

The S&P 500 suffered worst month In September, but it still eked out a 0.2% gain for the third quarter.

Lots of stocks’ gains for the year were offset by the September slump.But there are some stocks helped keep the market afloat .

CNBC ranked the top performers in S&P 500 index for the third quarter using data from FactSet. The top 20 are dominated by lesser-known names in health care, technology and financials. Energy, the only sector to finish higher in September, made a small appearance.

Here are the biggest third-quarter winners in the S&P 500:Moderna, Inc. generated the highest return in the S&P for the third quarter, about 60%, as Covid-19 vaccines continued being rolled out to more people and talk of a Covid booster shot evolved. The vaccine maker’s stock popped after it announced it would test a combined Covid and flu vaccine.

Also, Moderna is higher by a whopping 268% for the year.

Paycom Software, Inc. is only up about 8% for the year. Still, the payroll services company generated the second-largest returns for the quarter, about 36%, as people began reentering the workforce. Government stimulus targeted at mid-market and small businesses helped the firm as well, according to Oppenheimer’s Brian Schwartz.

Monolithic Power Systems a high-performance analog semiconductor company, was up 29% for the quarter and about 32% for the year.

Quanta Services, a contracting services company, gained about 25% for the quarter. Stifel recently said the stock saw an impact from both lower oil prices and Covid-related shelter in place orders and that it anticipates some recovery in the market in the second half of the year.

Oil prices dipped in the middle of the quarter but have been rallying since. While many of the top performers for the third quarter had a down month in September or eked out small gains, Quanta is up more than 11% for the month.