Qualys, Inc.
US ˙ NasdaqGS ˙ US74758T3032

SecurityQLYS / Qualys, Inc.
InstitutionParallel Advisors, LLC
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Parallel Advisors, LLC ownership in QLYS / Qualys, Inc.

On June 2, 2026 - Parallel Advisors, LLC filed a 13F-HR/A form disclosing ownership of 0 shares of Qualys, Inc. (US:QLYS) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 528 shares of Qualys, Inc.. This represents a change in shares of -100.00% during the quarter. The current value of the position is $0 USD.

Parallel Advisors, LLC has a history of taking positions in derivatives of the underlying security (QLYS) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

QLYS / Qualys, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-06-02 2026-03-31 13F/A-1 QUALYS INC COM Stock 74758T303 0 -528 -100.00 0 -100.00
2026-02-11 2025-12-31 13F QUALYS INC COM Stock 74758T303 528 1 0.19 70 1.45 0.0013
2025-11-13 2025-09-30 13F QUALYS INC COM Stock 74758T303 527 43 8.88 70 0.00 0.0013
2025-07-08 2025-06-30 13F QUALYS INC COM Stock 74758T303 484 218 81.95 69 109.09 0.0014
2025-04-08 2025-03-31 13F QUALYS INC COM Stock 74758T303 266 48 22.02 33 10.00 0.0008
2025-02-10 2024-12-31 13F QUALYS INC COM Stock 74758T303 218 17 8.46 31 20.00 0.0007
2024-11-13 2024-09-30 13F QUALYS INC COM Stock 74758T303 201 -19 -8.64 26 -19.35 0.0006
2024-08-08 2024-06-30 13F QUALYS INC COM Stock 74758T303 220 -54 -19.71 31 -31.11 0.0008
2024-05-06 2024-03-31 13F QUALYS INC COM Stock 74758T303 274 -76 -21.71 46 -33.82 0.0012
2024-02-12 2023-12-31 13F QUALYS INC COM Stock 74758T303 350 141 67.46 69 119.35 0.0020
2024-05-20 2023-09-30 13F/A-1 QUALYS INC COM Stock 74758T303 209 58 38.41 32 63.16 0.0011
2023-11-14 2023-09-30 13F QUALYS INC COM Stock 74758T303 209 58 32 0.0011
2024-05-20 2023-06-30 13F/A-1 QUALYS INC COM Stock 74758T303 151 -126 -45.49 20 -47.22 0.0006
2023-08-04 2023-06-30 13F QUALYS INC COM Stock 74758T303 151 -126 20 0.0006
2024-05-20 2023-03-31 13F/A-1 QUALYS INC COM Stock 74758T303 277 115 70.99 36 100.00 0.0012
2023-04-25 2023-03-31 13F QUALYS INC COM Stock 74758T303 277 115 36 0.0012
2023-02-06 2022-12-31 13F QUALYS INC COM Stock 74758T303 162 -29 -15.18 18 -33.33 0.0008
2022-11-10 2022-09-30 13F QUALYS INC COM Stock 74758T303 191 -372 -66.07 27 -61.97 0.0012
2022-08-01 2022-06-30 13F QUALYS INC COM Stock 74758T303 563 70 14.20 71 0.00 0.0033
2022-04-28 2022-03-31 13F QUALYS INC COM Stock 74758T303 493 -34 -6.45 71 -1.39 0.0028
2022-01-20 2021-12-31 13F QUALYS INC COM Stock 74758T303 527 337 177.37 72 242.86 0.0027
2021-11-02 2021-09-30 13F/A-1 QUALYS INC COM Stock 74758T303 190 19 11.11 21 23.53 0.0008
2021-08-06 2021-06-30 13F QUALYS INC COM Stock 74758T303 171 -18 -9.52 17 -15.00 0.0007
2021-04-23 2021-03-31 13F QUALYS INC COM Stock 74758T303 189 -17 -8.25 20 -20.00 0.0009
2021-02-02 2020-12-31 13F QUALYS INC COM Stock 74758T303 206 5 2.49 25 25.00 0.0014
2020-10-27 2020-09-30 13F QUALYS INC COM Stock 74758T303 201 44 28.03 20 25.00 0.0012
2020-07-16 2020-06-30 13F QUALYS INC COM Stock 74758T303 157 -37 -19.07 16 0.00 0.0010
2020-04-27 2020-03-31 13F QUALYS INC COM Stock 74758T303 194 0 0.00 16 0.00 0.0013
2020-01-30 2019-12-31 13F QUALYS INC COM Stock 74758T303 194 149 331.11 16 433.33 0.0012
2019-11-01 2019-09-30 13F QUALYS INC COM Stock 74758T303 45 0 0.00 3 -25.00 0.0003
2019-08-05 2019-06-30 13F QUALYS INC COM Stock 74758T303 45 0 0.00 4 0.00 0.0004
2019-05-01 2019-03-31 13F QUALYS INC COM Stock 74758T303 45 0 0.00 4 33.33 0.0004
2019-02-05 2018-12-31 13F QUALYS INC COM Stock 74758T303 45 0 0.00 3 -25.00 0.0004
2018-11-01 2018-09-30 13F QUALYS INC COM Stock 74758T303 45 40 800.00 4 0.0005
2018-07-30 2018-06-30 13F QUALYS INC COM Stock 74758T303 5 0 0.00 0 0.0000
2018-05-08 2018-03-31 13F QUALYS INC COM Stock 74758T303 5 0 0.00 0 0.0000
2018-02-13 2017-12-31 13F QUALYS INC COM Stock 74758T303 5 0 0.00 0 0.0000
2017-11-15 2017-09-30 13F/A-1 QUALYS INC COM Stock 74758T303 5 0 0.00 0 0.0000
2017-08-07 2017-06-30 13F QUALYS INC COM Stock 74758T303 5 0 0.00 0 0.0000
2017-05-12 2017-03-31 13F/A-1 QUALYS INC COM Stock 74758T303 5 -259 -98.11 0 -100.00
2017-05-12 2017-03-31 13F QUALYS INC COM Stock 74758T303 5 0
2017-02-14 2016-12-31 13F QUALYS INC COM Stock 74758T303 264 264 8 0.0019
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-01-19 2021-12-31 13F QUALYS INC COM Stock Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-10-22 2021-09-30 13F QUALYS INC COM Stock Call 171 17 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.