13G Filing: Nexthera Capital and Catalyst Biosciences Inc. (CBIO)

Item 3.

If This Statement is Filed Pursuant to Rule 13d 1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:

Item 4.

Ownership.

Provide the following information regarding the aggregate number and percentage of the class of securities of the Issuer.

(a)

Amount beneficially owned:

As of the close of business on December 26, 2017, the Reporting Persons may be deemed to have  beneficially owned 311,175 shares of Common Stock.

(b)

Percent of class:

The aggregate percentage of Common Stock reported owned by each person named herein is based upon approximately 5,813,780 shares of Common Stock outstanding as of December 20, 2017, which is the total number of Common Stock outstanding as reported in the Issuer’s Prospectus Supplement on Form 424B5 filed with the Securities and Exchange Commission on December 21, 2017. As of the close of business on December 26, 2017, the Reporting Persons may be deemed to have beneficially owned approximately 5.4% of the outstanding Common Stock.

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote:

See Cover Pages Items 5-9.

(ii)

Shared power to vote or to direct the vote

See Cover Pages Items 5-9.

(iii)

Sole power to dispose or to direct the disposition of

See Cover Pages Items 5-9.

(iv)

Shared power to dispose or to direct the disposition of

See Cover Pages Items 5-9.