X0306 4 2018-12-12 0 0001366527 Carbon Black, Inc. CBLK 0001357840 Highland Entrepreneurs Fund VII Limited Partnership C/O HIGHLAND CAPITAL PARTNERS ONE BROADWAY, 16TH FLOOR CAMBRIDGE MA 02142 0 0 1 0 0001407941 HEF VI, Limited Partnership C/O HIGHLAND CAPITAL PARTNERS ONE BROADWAY, 16TH FLOOR CAMBRIDGE MA 02142 0 0 1 0 Common Stock 2018-12-12 4 J 0 1166810 0 D 2035739 I By Highland Capital Partners VI Limited Partnership Common Stock 2018-12-12 4 J 0 639653 0 D 1116002 I By Highland Capital Partners VI-B Limited Partnership Common Stock 2018-12-12 4 J 0 57792 0 D 100829 I By Highland Entrepreneurs' Fund VI Limited Partnership Common Stock 2018-12-12 4 J 0 298754 0 D 521234 I By Highland Capital Partners VII Limited Partnership Common Stock 2018-12-12 4 J 0 72394 0 D 126304 I By Highland Capital Partners VII-B Limited Partnership Common Stock 2018-12-12 4 J 0 105428 0 D 183940 I By Highland Capital Partners VII-C Limited Partnership Common Stock 2018-12-12 4 J 0 9362 0 D 16331 I By Highland Entrepreneurs' Fund VII Limited Partnership Effective December 12, 2018, Highland Capital Partners VI Limited Partnership ("HCP VI"), a venture capital partnership, distributed in-kind, without consideration, a total of 1,166,810 shares of Common Stock of the Issuer to its limited partners, including Highland Management Partners VI Limited Partnership ("HMP VI LP"), the general partner of HCP VI, and to the limited partners of HMP VI LP. The general partner of HMP VI LP is Highland Management Partners VI, Inc. ("Highland Management"). Each of HMP VI LP and Highland Management disclaims Section 16 beneficial ownership of all shares except to the extent of their pecuniary interest, if any, therein. This report shall not be deemed to be an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purpose. Effective December 12, 2018, Highland Capital Partners VI-B Limited Partnership ("HCP VI-B"), a venture capital partnership, distributed in-kind, without consideration, a total of 639,653 shares of Common Stock of the Issuer to its limited partners, including HMP VI LP, the general partner of HCP VI-B, and to the limited partners of HMP VI LP. The general partner of HMP VI LP is Highland Management. Each of HMP VI LP and Highland Management disclaims Section 16 beneficial ownership of all shares except to the extent of their pecuniary interest, if any, therein. This report shall not be deemed to be an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purpose. Effective December 12, 2018, Highland Entrepreneurs' Fund VI Limited Partnership ("HEF VI"), a venture capital partnership, distributed in-kind, without consideration, a total of 57,792 shares of Common Stock of the Issuer to its limited partners, including HEF VI Limited Partnership ("HEF"), the general partner of HEF VI, and to the limited partners of HEF. The general partner of HEF is Highland Management. Each of HEF and Highland Management disclaims Section 16 beneficial ownership of all shares except to the extent of their pecuniary interest, if any, therein. This report shall not be deemed to be an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purpose. Effective December 12, 2018, Highland Capital Partners VII Limited Partnership ("HCP VII"), a venture capital partnership, distributed in-kind, without consideration, a total of 298,754 shares of Common Stock of the Issuer to its limited partners, including Highland Management Partners VII Limited Partnership ("HMP VII LP"), the general partner of HCP VII, and to the limited partners of HMP VII LP. The general partner of HMP VII LP is Highland Management Partners VII, LLC ("HMP VII LLC"). Each of HMP VII LP and HMP VII LLC disclaims Section 16 beneficial ownership of all shares except to the extent of their pecuniary interest, if any, therein. This report shall not be deemed to be an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purpose. Effective December 12, 2018, Highland Capital Partners VII-B Limited Partnership ("HCP VII-B"), a venture capital partnership, distributed in-kind, without consideration, a total of 72,394 shares of Common Stock of the Issuer to its limited partners, including HMP VII LP, the general partner of HCP VII-B, and to the limited partners of HMP VII LP. The general partner of HMP VII LP is HMP VII LLC. Each of HMP VII LP and HMP VII LLC disclaims Section 16 beneficial ownership of all shares except to the extent of their pecuniary interest, if any, therein. This report shall not be deemed to be an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purpose. Effective December 12, 2018, Highland Capital Partners VII-C Limited Partnership ("HCP VII-C"), a venture capital partnership, distributed in-kind, without consideration, a total of 105,428 shares of Common Stock of the Issuer to its limited partners, including HMP VII LP, the general partner of HCP VII-C, and to the limited partners of HMP VII LP. The general partner of HMP VII LP is HMP VII LLC. Each of HMP VII LP and HMP VII LLC disclaims Section 16 beneficial ownership of all shares except to the extent of their pecuniary interest, if any, therein. This report shall not be deemed to be an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purpose. Effective December 12, 2018, Highland Entrepreneurs' Fund VII Limited Partnership ("HEF VII"), a venture capital partnership, distributed in-kind, without consideration, a total of 9,362 shares of Common Stock of the Issuer to its limited partners, including HMP VII LP, the general partner of HEF VII, and to the limited partners of HMP VII LP. The general partner of HMP VII LP is HMP VII LLC. Each of HMP VII LP and HMP VII LLC disclaims Section 16 beneficial ownership of all shares except to the extent of their pecuniary interest, if any, therein. This report shall not be deemed to be an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purpose. Because no more than 10 reporting persons can file any Form 4 through the Securities and Exchange Commission's EDGAR system, Highland Management Partners VI, Inc., Highland Management Partners VI Limited Partnership, Highland Capital Partners VI-B Limited Partnership, Highland Capital Partners VI Limited Partnership, Highland Entrepreneurs' Fund VI Limited Partnership, Highland Management Partners VII, LLC, Highland Management Partners VII Limited Partnership, Highland Capital Partners VII Limited Partnership, Highland Capital Partners VII-B Limited Partnership and Highland Capital Partners VII-C Limited Partnership have filed a separate Form 4. The Reporting Persons are jointly filing this Form 4 pursuant to Rule 16a-3(j) under the Exchange Act. By: /s/ Jessica Healy, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Entrepreneurs' Fund VII Limited Partnership 2018-12-14 By: /s/ Jessica Healey, Authorized Manager of Highland Management Partners VI, Inc., the general partner of HEF VI Limited Partnership 2018-12-14