FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

COURTOT PHILIPPE F 		2. Issuer Name and Ticker or Trading Symbol

QUALYS, INC. [ QLYS ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      __ X __ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Chairman, President & CEO
(Last)          (First)          (Middle)

C/O QUALYS, INC., 1600 BRIDGE PARKWAY 		3. Date of Earliest Transaction (MM/DD/YYYY)

11/9/2017
(Street)

REDWOOD CITY, CA 94065
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   11/9/2017     M (1)    20000   A $3.80   5564435   D    
Common Stock   11/9/2017     S (1)    16833   D $56.2555   (2) 5547602   D    
Common Stock   11/9/2017     S (1)    3167   D $56.631   (3) 5544435   D    
Common Stock   11/10/2017     M (1)    20000   A $3.80   5564435   D    
Common Stock   11/10/2017     S (1)    2711   D $56.2218   (4) 5561724   D    
Common Stock   11/10/2017     S (1)    17289   D $56.8265   (5) 5544435   D    
Common Stock                  100000   I   See Footnote   (6)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy)   $3.80   11/9/2017     M   (1)       20000      (7) 12/2/2019   Common Stock   20000   $0.00   461927   D    
Stock Option (right to buy)   $3.80   11/10/2017     M   (1)       20000      (7) 12/2/2019   Common Stock   20000   $0.00   441927   D    

Explanation of Responses:
(1)  The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 29, 2017.
(2)  The sale price represents the weighted average price of the shares sold ranging from $55.55 to $56.525 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.
(3)  The sale price represents the weighted average price of the shares sold ranging from $56.55 to $56.95 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.
(4)  The sale price represents the weighted average price of the shares sold ranging from $55.50 to $56.45 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.
(5)  The sale price represents the weighted average price of the shares sold ranging from $56.50 to $57.25 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.
(6)  These shares are held directly by a custodian under the Uniform Gifts to Minors Act for the benefit of the Reporting Person's minor child.
(7)  The option is fully vested and immediately exercisable.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
COURTOT PHILIPPE F
C/O QUALYS, INC.
1600 BRIDGE PARKWAY
REDWOOD CITY, CA 94065 		X X Chairman, President & CEO

Signatures
/s/ Bruce Posey by power of attorney for Philippe F. Courtot 11/13/2017
** 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 4(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 control number.
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