The 3 stocks who published earnings prior to markets tumbling

UnitedHealth, Delta Air Lines, Inc., Fastenal Co are the ones to read about today.

The leading indices are falling — Nasdaq trades at 12,100 after losing 0.28%. S&P 500 slipping 0.21% and closing at 4,129.

With Q1 earnings season getting underway, around 100% of US companies have missed market estimates so far. This past week, ManpowerGroup Inc. & F.N.B. Corporation published downbeat reports while Whirlpool Corp & Activision Blizzard are scheduled to release their results in the coming days.

What is an earnings report?

An earnings report is an official statement of a company's profitability over a certain period of time. Usually, these reports are released four times a year (quarterly reports) and have a significant impact on the market. These announcements are typically taken into consideration when making predictions.

Markets are down, stocks have released their quarterly earnings reports. Have a look at this rundown.

UnitedHealth: EPS of zero, Revenue of $91.93 billion

Following the release of quarterly results, UnitedHealth trades at $503.35.

The healthcare services provider drops 1.65% in early trade and remains within touching distance of the $503.35 level.

Delta Air Lines: EPS of zero, Revenue of $12.76 billion

Delta Air Lines trades at $34.34 after the company released its quarterly results.

The major US airline gaining 1.69% and hovering around the $34.34 level.

The major US airline is now trading 11.74% below its 3-month high of $44.73. So far this year, it has been under-performing the Nasdaq by 10.76%. Currently, the legacy US airline carrier has a market capitalization of $22 billion with an average daily trading volume of 11.75 million shares.

Fastenal: EPS of zero, Revenue of $1.86 billion

Fastenal trades at $53.12 after the company released its quarterly results.

After dipping down to $53.11 today, the industrial and construction supplies provider is recovering but is not yet all the way back to $53.27.