X0306 4 2019-03-22 1 0001401708 NanoString Technologies Inc NSTG 0001431443 Clarus Lifesciences II, L.P. C/O CLARUS VENTURES, 101 MAIN STREET, SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 0001431439 Clarus Ventures II GP, L.P. C/O CLARUS VENTURES 101 MAIN STREET, SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 0001762201 Blackstone Clarus II L.L.C. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001484870 Blackstone Holdings II L.P. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001464695 Blackstone Holdings I/II GP Inc C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001393818 Blackstone Group L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001404071 Blackstone Group Management L.L.C. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001070844 SCHWARZMAN STEPHEN A C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 Common Stock 2019-03-22 4 S 0 2000000 21.62 D 2036025 I See Footnotes This amount represents the $23.00 public offering price per share of common stock, par value $0.0001 per share, of NanoString Technologies, Inc. (the "Issuer"), less the underwriting discount of $1.38 per share. These securities are held directly by Clarus Lifesciences II, L.P. ("Clarus II"). Clarus Ventures II GP, L.P. ("Clarus II GP") is the sole general partner of Clarus II. Blackstone Clarus II L.L.C. is the sole general partner of Clarus GP. The sole member of Blackstone Clarus II L.L.C. is Blackstone Holdings II L.P. The sole general partner of Blackstone Holdings II L.P. is Blackstone Holdings I/II GP Inc. The controlling shareholder of Blackstone Holdings I/II GP Inc. is The Blackstone Group L.P. The sole general partner of The Blackstone Group L.P. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly-owned by Blackstone's senior managing directors and controlled by its founder, Stephen A. Schwarzman. Information with respect to each of the Reporting Persons is given solely by such Reporting Person, and no Reporting Person has responsibility for the accuracy or completeness of information supplied by another Reporting Person. Each of the Reporting Persons (other than Clarus II) disclaims beneficial ownership of the securities held by Clarus II, except to the extent of such Reporting Person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, each of the Reporting Persons (other than Clarus II) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose. CLARUS LIFESCIENCES II, L.P., By: Clarus Ventures II GP, L.P., its GP, By: Blackstone Clarus II L.L.C., its GP, By: Blackstone Holdings II L.P., its managing member, By: Blackstone Holdings I/II GP Inc., its GP, By: /s/ John G. Finley, Title: CLO 2019-03-22 CLARUS VENTURES II GP, L.P., By: Blackstone Clarus II L.L.C., its GP, By: Blackstone Holdings II L.P., its managing member, By: Blackstone Holdings I/II GP Inc., its GP, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2019-03-22 BLACKSTONE CLARUS II L.L.C., By: Blackstone Holdings II L.P., its managing member, By: Blackstone Holdings I/II GP Inc., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2019-03-22 BLACKSTONE HOLDINGS II L.P., By: Blackstone Holdings I/II GP Inc., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2019-03-22 BLACKSTONE HOLDINGS I/II GP INC., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2019-03-22 THE BLACKSTONE GROUP L.P., By: Blackstone Group Management L.L.C., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2019-03-22 BLACKSTONE GROUP MANAGEMENT L.L.C., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2019-03-22 /s/ Stephen A. Schwarzman 2019-03-22