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The study said that Cologuard was an "inefficient screening option" for colorectal cancer given its cost as compared to other CRC screening methods.

The index, which slightly underperformed the Dow Jones, had a smaller loss in August than in the previous month.

The single-cell sequencing firm originally said it was looking to raise $100 million in its initial public offering.

The index, which underperformed the Dow Jones and the Nasdaq, gave back the 11 percent gain it made in June.

Nasdaq told the company that its shares have failed to meet a minimum $1 per share closing price for 30 consecutive days and may face delisting action.

The firm said it needs more time to ensure that the DetermaVu assay is providing the most consistent and sensitive results for patients.

The investment bank gave Danaher a Neutral rating and a $148 price target on the firm's shares, while it gave Agilent an Overweight rating with an $83 price target.

Natera and Veracyte both received positive news regarding local coverage determinations from Medicare contractors, while the catalysts for Fluidigm's rise were unclear.

The index — which outperformed the Dow Jones, the Nasdaq, and the Biotechnology Index this month — gained more than 8 percent.