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SEC FORM 3 SEC Form 3
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
Pegueros Vanessa

(Last) (First) (Middle)
C/O CARBON BLACK, INC.
1100 WINTER STREET

(Street)
WALTHAM MA 02451

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
02/06/2019
3. Issuer Name and Ticker or Trading Symbol
Carbon Black, Inc. [ CBLK ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
Remarks:
Exhibit 24 - Power of Attorney
No securities are beneficially owned.
/s/ Vanessa Pegueros 02/08/2019
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
LIMITED POWER OF ATTORNEY
The undersigned hereby constitutes and appoints each of Eric
Pyenson and Mark Sullivan, signing singly, and with full power
of substitution, the undersigned's true and lawful attorney-
in-fact to:

(1)execute for and on behalf of the undersigned, in the
undersigned's capacity as an officer, director and/or ten
percent (10%) shareholder of Carbon Black, Inc., a Delaware
corporation (the "Company"), from time to time the following
U.S. Securities and Exchange Commission ("SEC") forms: (i) Form
ID, including any attached or related documents (such as Update
Passphrase Authentication), to effect the assignment of codes to
the undersigned to be used in the transmission of information to
the SEC using the EDGAR System; (ii) Form 3, Initial Statement
of Beneficial Ownership of Securities, including any attached 
documents; (iii) Form 4, Statement of Changes in Beneficial
Ownership of Securities, including any attached documents;
(iv) Form 5, Annual Statement of Beneficial Ownership of
Securities in accordance with Section 16(a) of the Securities
Exchange Act of 1934, as amended, and the rules thereunder,
including any attached documents; (v) Schedule 13D; and (vi)
amendments of each thereof, in accordance with the
 Securities
Exchange Act of 1934, as amended, and the rules thereunder,
including any attached documents;

(2)do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete
and execute any such Form 3, 4 or 5, Schedule 13D or any
amendment(s) thereto, and timely file such form(s) with the
SEC and any securities exchange, national association or
similar authority; and

(3)take any other action of any type whatsoever in connection
with the foregoing which, in the opinion of such attorney-in-fact,
may be of benefit to, in the best interest of, or legally required
by, the undersigned, it being understood that the documents
executed by such attorney-in-fact on behalf of the undersigned
pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may
approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact, 
acting singly, full power and authority to do and perform any and
every act and thing whatsoever requisite, necessary or proper to
be done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the undersigned 
might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all
that such attorney-in-fact, or such attorney-in-fact's substitute
or substitutes, shall lawfully do or cause to be done by virtue
of this power of attorney and the rights and powers herein granted.  
The undersigned acknowledges that the foregoing attorneys-in-fact,
in serving in such capacity at the request of the undersigned, are
not assuming, nor is the Company assuming, any of the undersigned's
responsibilities to comply with Section 16 or Regulation 13D-G of the
Securities Exchange Act of 1934, as amended.  The undersigned hereby
agrees to indemnify the attorneys-in-fact and the Company from and
against any demand, damage, loss, cost or expense arising from any
false or misleading information provided by the undersigned to the
attorneys-in-fact.

This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file such forms with respect
to the undersigned's holdings of and transactions in securities issued
by the Company, unless earlier revoked by the undersigned in a signed 
writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of February 8, 2019.

/s/ Vanessa Pegueros
Vanessa Pegueros