Flowserve Corporation
US ˙ NYSE ˙ US34354P1057

SecurityFLS / Flowserve Corporation
InstitutionParallel Advisors, LLC
Latest Disclosed Ownership939 shares
Latest Disclosed Value $ 65,148
Parallel Advisors, LLC ownership in FLS / Flowserve Corporation

On February 11, 2026 - Parallel Advisors, LLC filed a 13F-HR form disclosing ownership of 939 shares of Flowserve Corporation (US:FLS) valued at $65,148 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 968 shares of Flowserve Corporation. This represents a change in shares of -3.00% during the quarter. The current value of the position is $70,819 USD.

Parallel Advisors, LLC has a history of taking positions in derivatives of the underlying security (FLS) 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.

FLS / Flowserve Corporation 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)
2026-02-11 2025-12-31 13F FLOWSERVE CORP COM Stock 34354P105 939 -29 -3.00 65 27.45 0.0012
2025-11-13 2025-09-30 13F FLOWSERVE CORP COM Stock 34354P105 968 162 20.10 51 21.43 0.0009
2025-07-08 2025-06-30 13F FLOWSERVE CORP COM Stock 34354P105 806 344 74.46 42 90.91 0.0008
2025-04-08 2025-03-31 13F FLOWSERVE CORP COM Stock 34354P105 462 -158 -25.48 23 -37.14 0.0005
2025-02-10 2024-12-31 13F FLOWSERVE CORP COM Stock 34354P105 620 64 11.51 36 25.00 0.0008
2024-11-13 2024-09-30 13F FLOWSERVE CORP COM Stock 34354P105 556 348 167.31 29 180.00 0.0007
2024-08-08 2024-06-30 13F FLOWSERVE CORP COM Stock 34354P105 208 29 16.20 10 25.00 0.0003
2024-05-06 2024-03-31 13F FLOWSERVE CORP COM Stock 34354P105 179 0 0.00 8 14.29 0.0002
2024-02-12 2023-12-31 13F FLOWSERVE CORP COM Stock 34354P105 179 28 18.54 7 16.67 0.0002
2024-05-20 2023-09-30 13F/A-1 FLOWSERVE CORP COM Stock 34354P105 151 0 0.00 6 20.00 0.0002
2023-11-14 2023-09-30 13F FLOWSERVE CORP COM Stock 34354P105 151 0 6 0.0002
2024-05-20 2023-06-30 13F/A-1 FLOWSERVE CORP COM Stock 34354P105 151 0 0.00 6 0.00 0.0002
2023-08-04 2023-06-30 13F FLOWSERVE CORP COM Stock 34354P105 151 0 6 0.0002
2024-05-20 2023-03-31 13F/A-1 FLOWSERVE CORP COM Stock 34354P105 151 40 36.04 5 66.67 0.0002
2023-04-25 2023-03-31 13F FLOWSERVE CORP COM Stock 34354P105 151 40 5 0.0002
2023-02-06 2022-12-31 13F FLOWSERVE CORP COM Stock 34354P105 111 -69 -38.33 3 -25.00 0.0001
2022-11-10 2022-09-30 13F FLOWSERVE CORP COM Stock 34354P105 180 -96 -34.78 4 -50.00 0.0002
2022-08-01 2022-06-30 13F FLOWSERVE CORP COM Stock 34354P105 276 -186 -40.26 8 -50.00 0.0004
2022-04-28 2022-03-31 13F FLOWSERVE CORP COM Stock 34354P105 462 -66 -12.50 16 0.00 0.0006
2022-01-20 2021-12-31 13F FLOWSERVE CORP COM Stock 34354P105 528 313 145.58 16 128.57 0.0006
2021-11-02 2021-09-30 13F/A-1 FLOWSERVE CORP COM Stock 34354P105 215 -44 -16.99 7 -30.00 0.0003
2021-08-06 2021-06-30 13F FLOWSERVE CORP COM Stock 34354P105 259 30 13.10 10 11.11 0.0004
2021-04-23 2021-03-31 13F FLOWSERVE CORP COM Stock 34354P105 229 7 3.15 9 12.50 0.0004
2021-02-02 2020-12-31 13F FLOWSERVE CORP COM Stock 34354P105 222 -335 -60.14 8 -46.67 0.0004
2020-10-27 2020-09-30 13F FLOWSERVE CORP COM Stock 34354P105 557 10 1.83 15 0.00 0.0009
2020-07-16 2020-06-30 13F FLOWSERVE CORP COM Stock 34354P105 547 -374 -40.61 15 -31.82 0.0010
2020-04-27 2020-03-31 13F FLOWSERVE CORP COM Stock 34354P105 921 564 157.98 22 22.22 0.0018
2020-01-30 2019-12-31 13F FLOWSERVE CORP COM Stock 34354P105 357 -12 -3.25 18 5.88 0.0014
2019-11-01 2019-09-30 13F FLOWSERVE CORP COM Stock 34354P105 369 38 11.48 17 0.00 0.0015
2019-08-05 2019-06-30 13F FLOWSERVE CORP COM Stock 34354P105 331 120 56.87 17 70.00 0.0017
2019-05-01 2019-03-31 13F FLOWSERVE CORP COM Stock 34354P105 211 -132 -38.48 10 -23.08 0.0011
2019-02-05 2018-12-31 13F FLOWSERVE CORP COM Stock 34354P105 343 -70 -16.95 13 -43.48 0.0018
2018-11-01 2018-09-30 13F FLOWSERVE CORP COM Stock 34354P105 413 0 0.00 23 43.75 0.0029
2018-07-30 2018-06-30 13F FLOWSERVE CORP COM Stock 34354P105 413 28 7.27 16 -5.88 0.0023
2018-05-08 2018-03-31 13F FLOWSERVE CORP COM Stock 34354P105 385 -19 -4.70 17 0.00 0.0027
2018-02-13 2017-12-31 13F FLOWSERVE CORP COM Stock 34354P105 404 -15 -3.58 17 6.25 0.0028
2017-11-15 2017-09-30 13F/A-1 FLOWSERVE CORP COM Stock 34354P105 419 -88 -17.36 16 -23.81 0.0028
2017-08-07 2017-06-30 13F FLOWSERVE CORP COM Stock 34354P105 507 -26 -4.88 21 -22.22 0.0040
2017-05-12 2017-03-31 13F/A-1 FLOWSERVE CORP COM Stock 34354P105 533 38 7.68 27 12.50 0.0054
2017-05-12 2017-03-31 13F FLOWSERVE CORP COM Stock 34354P105 533 27
2017-02-14 2016-12-31 13F FLOWSERVE CORP COM Stock 34354P105 495 495 24 0.0056
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 FLOWSERVE CORP COM Stock Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-10-22 2021-09-30 13F FLOWSERVE CORP COM Stock Call 259 10 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.