13G Filing: Cormorant Asset Management and Ignyta Inc. (RXDX)

1

Names of Reporting Persons.

I.R.S. Identification Nos. of above persons (entities only)

Cormorant Global Healthcare Master Fund, LP

2

Check the Appropriate Box if a Member of a Group (See Instructions)

3

SEC Use Only

4

Citizenship or Place of Organization.

Cayman Islands

Number

of Shares

Beneficially

Owned by

Each

Reporting

Person With

0 shares

2,489,380 shares

Refer to Item 4 below.

0 shares

2,489,380 shares

Refer to Item 4 below.

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,489,380 shares

Refer to Item 4 below.

10

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)     [ ] N/A

11

Percent of Class Represented by Amount in Row (9)*

4.4%

Refer to Item 4 below.

12

Type of Reporting Person (See Instructions)

PN (Partnership)