A Diagnostics & Imaging Week

Natus Medical (San Carlos, California) reported that Roth Capital Partners, the sole underwriter of its recently disclosed public offering of 770,000 shares of common stock valued at roughly $13.4 million has exercised its over-allotment option. Roth will purchase another 115,500 shares, bringing the total shares offered to 885,500 and the expected proceeds to $15.4 million based on a per share price of $18.27.

The offering closed last week. The company expects to receive about $15.4 million in net proceeds from the offering, after payment of underwriting discounts and expenses of the offering.

Natus is a provider of healthcare products used for the screening, treatment, monitoring and tracking of common medical ailments such as hearing impairment, neurological dysfunction, epilepsy, sleep disorders, and newborn care.

In other financing news:

• Graymark Healthcare (Oklahoma City), a medical holding company, reported that its 1-for-5 split of the company's common stock took effect last Friday, and that its stock symbol has changed from GRMK to GRMH.

Graymark reported last month that its board had approved the split.

The reverse split will reduce the number of shares of Graymark's common stock outstanding from about 117.7 million to roughly 23.5 million, the company said. Graymark stockholders received one new share for every five shares held.

Graymark owns and operates pharmacies, diagnostic sleep centers and a medical equipment company.