X0206 3 2013-06-25 0 0001401708 NanoString Technologies Inc NSTG 0001431443 Clarus Lifesciences II, L.P. C/O OF CLARUS VENTURES, LLC 101 MAIN STREET, SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 0001431439 Clarus Ventures II GP, L.P. C/O OF CLARUS VENTURES, LLC 101 MAIN STREET, SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 0001431437 Clarus Ventures II, LLC C/O OF CLARUS VENTURES, LLC 101 MAIN STREET, SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 Series C Preferred Stock 0.00 Common Stock 2249053 D Series D Preferred Stock 0.00 Common Stock 812045 D Series D Preferred Warrant (Right to Buy) 0.00 2018-11-01 Common Stock 162408 D Series E Preferred Stock 0.00 Common Stock 148342 D Reflects the automatic conversion of each share of Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock into one share of Common Stock to occur upon the closing of the Issuer's initial public offering. Each share has no expiration date. Reflects a 1-for-32 reverse stock split of the Issuer's outstanding shares effected June 12, 2013. Clarus Ventures II GP, L.P. (the "GPLP"), as the sole general partner of Clarus Lifesciences II, L.P. ("Clarus"), may be deemed to beneficially own certain of the shares held of record by Clarus. The GPLP disclaims beneficial ownership of all shares held of record by Clarus in which the GPLP does not have an actual pecuniary interest. Clarus Ventures II, LLC (the "GPLLC"), as the sole general partner of the GPLP, may be deemed to beneficially own certain of the shares held of record by Clarus. The GPLLC disclaims beneficial ownership of all shares held of record by Clarus in which it does not have an actual pecuniary interest. Each of Nicholas Galakatos, a member of the board of directors, and Messrs. Henner, Liptak, Simon, Steinmetz and Wheeler, as individual Managing Directors of the GPLLC, may be deemed to beneficially own certain of the shares held of record by Clarus. Each of Messrs. Galakatos, Henner, Liptak, Simon, Steinmetz and Wheeler disclaims beneficial ownership of all shares held of record by Clarus in which he does not have an actual pecuniary interest. /s/ Barbara Mery, Attorney-in-fact 2013-06-25 Barbara Mery, Attorney-in-fact on behalf of Clarus Ventures II GP, L.P. 2013-06-25 Barbara Mary, Attorney-in-fact on behalf of Clarus Ventures II, LLC 2013-06-25