Qualys (NASDAQ: QLYS) director sells 500 shares under 10b5-1 plan

Rhea-AI Filing Summary

QUALYS, INC. director Wendy Pfeiffer reported an open-market sale of 500 shares of Common Stock at $101.21 per share. After this transaction, she directly owns 10,582 shares. The sale was carried out under a pre-arranged Rule 10b5-1 trading plan adopted on February 20, 2026, indicating it was scheduled in advance as part of ongoing portfolio management.

Insights

Equity compensation and insider-trading analyst

Routine, pre-planned sale of a small share block by a Qualys director.

Director Wendy Pfeiffer sold 500 shares of Qualys Common Stock at $101.21 per share in an open-market transaction. Following the sale, she continues to hold 10,582 shares directly, indicating she retains a meaningful equity position.

The filing notes the trade was executed under a Rule 10b5-1 trading plan adopted on February 20, 2026. Such plans pre-schedule trades, reducing the informational value of the exact timing. With no derivative exercises or large position changes disclosed, this appears to be a routine liquidity event rather than a thesis-changing move.

Insider Trade Summary 10b5-1

Net Seller: 500 shares ($50,605)

Net Sell 1 txn

Insider Pfeiffer Wendy

Role null

Sold 500 shs ($51K)

Type	Security	Shares	Price	Value
Sale	Common Stock	500	$101.21	$51K

Holdings After Transaction: Common Stock — 10,582 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 500 shares Sale price: $101.21 per share Shares owned after sale: 10,582 shares +1 more

4 metrics

Shares sold 500 shares Open-market sale on May 22, 2026

Sale price $101.21 per share Price for Common Stock sold

Shares owned after sale 10,582 shares Direct holdings following transaction

Net shares sold 500 shares Net buy/sell shares for this Form 4 period

Key Terms

Rule 10b5-1 trading plan, open-market sale, Form 4, Common Stock

4 terms

Rule 10b5-1 trading plan regulatory

"The sale transaction ... was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person..."

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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"The sale transaction reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan..."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 Insider Transactions: What Each Field Means →

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^*

Pfeiffer Wendy

(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)
05/22/2026

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	05/22/2026		S(1)		500	D	$101.21	10,582	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 20, 2026.

	/s/ Bruce Posey, by power of attorney	05/26/2026
	** 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)

FAQ

What insider transaction did QUALYS (QLYS) director Wendy Pfeiffer report?

Director Wendy Pfeiffer reported selling 500 shares of Qualys Common Stock. The shares were sold in an open-market transaction at a price of $101.21 per share, and she continued to hold 10,582 shares directly after the sale.

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

Yes. The filing states the sale was effected under a Rule 10b5-1 trading plan adopted on February 20, 2026. These plans pre-schedule trades, indicating the timing of the sale was determined in advance rather than being an opportunistic market decision.

How many QUALYS (QLYS) shares does Wendy Pfeiffer own after the reported sale?

After selling 500 shares, Wendy Pfeiffer directly owns 10,582 shares of Qualys Common Stock. This post-transaction holding shows she maintained a significant equity position in the company despite the sale disclosed in this Form 4 filing.

What was the price of the QUALYS (QLYS) shares sold by director Wendy Pfeiffer?

The 500 shares of Qualys Common Stock sold by director Wendy Pfeiffer were transacted at $101.21 per share. This price reflects the sale value for this specific trade and is directly disclosed in the Form 4 transaction details.

Does the QUALYS (QLYS) Form 4 show any option exercises or derivative trades?

No derivative transactions are listed in this Form 4. The transaction summary reports zero derivative exercises and no derivative positions, with only a single open-market sale of 500 shares of Common Stock disclosed for the reporting period.