Qualys director sells 511 shares at $175.27

A QUALYS, INC. director sold 511 shares under a pre-arranged Rule 10b5-1 trading plan and now holds 6,270 shares directly.

Rhea-AI Filing Summary

QUALYS, INC. (QLYS) director Thomas Berquist reported selling 511 shares of common stock on September 2, 2026 at $175.27 per share in an open-market or private sale. After this sale, he directly holds 6,270 shares of QUALYS common stock. The sale was made under a Rule 10b5-1 trading plan adopted on February 27, 2026.

Insider Trade Summary 10b5-1

Net Seller: 511 shares

Net Sell 1 txn

Insider Berquist Thomas

Role Director

Sold 511 shs ($90K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	511	$175.27	$90K

Holdings After Transaction: Common Stock — 6,270 shares (Direct)

Footnotes (1)

1. F1. The sale transaction reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2026.

Key Figures

Shares sold: 511 shares Sale price per share: $175.27 per share Shares held after sale: 6,270 shares

3 metrics

Shares sold 511 shares Common stock sold by director on September 2, 2026

Sale price per share $175.27 per share Price for the 511 shares of common stock sold

Shares held after sale 6,270 shares Director’s direct QUALYS common stock holdings following the sale

Key Terms

Rule 10b5-1 trading plan

1 terms

Rule 10b5-1 trading plan regulatory

"The sale transaction reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2026."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

FAQ

What insider trading did QUALYS (QLYS) disclose for Thomas Berquist?

QUALYS director Thomas Berquist reported selling 511 shares of common stock on September 2, 2026 at $175.27 per share in an open-market or private transaction, leaving him with 6,270 shares held directly.

Was the QUALYS (QLYS) insider sale made under a Rule 10b5-1 plan?

Yes. The filing states the 511-share sale on September 2, 2026 was effected pursuant to a Rule 10b5-1 trading plan adopted by Thomas Berquist on February 27, 2026.

How many QUALYS (QLYS) shares did the director sell and at what price?

Thomas Berquist sold 511 QUALYS common shares at a price of $175.27 per share on September 2, 2026, according to the Form 4 filing.

How many QUALYS (QLYS) shares does Thomas Berquist own after the reported sale?

After the 511-share sale reported for September 2, 2026, Thomas Berquist directly owns 6,270 shares of QUALYS common stock.

What is the role of Thomas Berquist at QUALYS (QLYS) in this Form 4?

In this Form 4, Thomas Berquist is identified as a director of QUALYS, INC. reporting a sale of the company’s common stock from his direct holdings.

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Available on EDGAR 09/03/2026 - 04:06 PM Accepted by SEC EDGAR 09/03/2026 - 04:04 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Berquist Thomas

(Last) (First) (Middle)

C/O QUALYS, INC.

919 E. HILLSDALE BLVD.

(Street)

FOSTER CITY CALIFORNIA 94404

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
QUALYS, INC. [ QLYS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/02/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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	09/02/2026		S(1)		511	D	$175.27	6,270	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)		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: 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

Explanation of Responses:

1. The sale transaction reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2026.

	/s/ Bruce Posey, by power of attorney	09/03/2026
	** 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 Number.
* Form 4: SEC 1474 (03-26)