Westlake Corporation
GB ˙ LSE ˙ US9604131022
85,04 US$ ↓ −1,12 (−1,30%)
2026-06-04
DELAT PRIS
SecurityGB:0LVK / Westlake Corporation
InstitutionUBS Group AG
Latest Disclosed Ownership811,266 shares
Latest Disclosed Value $ 94,772,095
UBS Group AG ownership in 0LVK / Westlake Corporation

On May 5, 2026 - UBS Group AG filed a 13F-HR form disclosing ownership of 811,266 shares of Westlake Corporation (GB:0LVK) valued at $94,853,221 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 648,012 shares of Westlake Corporation. This represents a change in shares of 25.19% during the quarter. The current value of the position is $68,990,061 USD.

UBS Group AG has a history of taking positions in derivatives of the underlying security (0LVK) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put 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.

GB:0LVK / Westlake 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)
2026-05-05 2026-03-31 13F WESTLAKE COM 960413102 811,266 163,254 25.19 94,772 97.80 0.0142
2026-01-29 2025-12-31 13F WESTLAKE COM 960413102 648,012 87,532 15.62 47,914 10.94 0.0078
2025-11-13 2025-09-30 13F WESTLAKE COM 960413102 560,480 117,013 26.39 43,191 28.27 0.0068
2025-08-14 2025-06-30 13F WESTLAKE COM 960413102 443,467 -165,611 -27.19 33,672 -44.73 0.0058
2025-05-13 2025-03-31 13F WESTLAKE COM 960413102 609,078 51,518 9.24 60,926 -4.69 0.0112
2025-02-14 2024-12-31 13F WESTLAKE COM 960413102 557,560 516,948 1,272.89 63,924 947.42 0.0118
2024-11-14 2024-09-30 13F WESTLAKE COM 960413102 40,612 19,942 96.48 6,104 103.91 0.0013
2024-08-14 2024-06-30 13F WESTLAKE COM 960413102 20,670 -11,576 -35.90 2,993 -39.25 0.0007
2024-05-13 2024-03-31 13F WESTLAKE COM 960413102 32,246 -15,923 -33.06 4,927 -26.91 0.0012
2024-02-09 2023-12-31 13F WESTLAKE COM 960413102 48,169 16,964 54.36 6,742 73.29 0.0020
2023-11-09 2023-09-30 13F WESTLAKE COM 960413102 31,205 -33,520 -51.79 3,890 -49.69 0.0013
2023-08-11 2023-06-30 13F WESTLAKE COM 960413102 64,725 52,179 415.90 7,733 431.41 0.0026
2023-05-12 2023-03-31 13F WESTLAKE COM 960413102 12,546 -8,612 -40.70 1,455 -32.92 0.0005
2023-02-08 2022-12-31 13F WESTLAKE COM 960413102 21,158 18,288 637.21 2,170 767.60 0.0008
2022-11-10 2022-09-30 13F WESTLAKE COM 960413102 2,870 -32,388 -91.86 250 -92.77 0.0001
2022-08-10 2022-06-30 13F WESTLAKE COM 960413102 35,258 14,315 68.35 3,456 33.69 0.0014
2022-05-16 2022-03-31 13F WESTLAKE COM 960413102 20,943 4,962 31.05 2,585 66.45 0.0009
2022-02-14 2021-12-31 13F WESTLAKE CHEM COM 960413102 15,981 -40,395 -71.65 1,553 -69.77 0.0004
2021-11-15 2021-09-30 13F WESTLAKE CHEM COM 960413102 56,376 42,818 315.81 5,138 320.80 0.0016
2021-08-13 2021-06-30 13F WESTLAKE CHEM COM 960413102 13,558 -5,515 -28.92 1,221 -27.92 0.0004
2021-05-12 2021-03-31 13F WESTLAKE CHEM COM 960413102 19,073 16,531 650.31 1,694 714.42 0.0006
2021-02-11 2020-12-31 13F WESTLAKE CHEM COM 960413102 2,542 -4,489 -63.85 208 -53.15 0.0001
2020-11-12 2020-09-30 13F WESTLAKE CHEM COM 960413102 7,031 -2,518 -26.37 444 -13.28 0.0002
2020-07-31 2020-06-30 13F WESTLAKE CHEM COM 960413102 9,549 -1,280 -11.82 512 23.67 0.0002
2020-05-01 2020-03-31 13F WESTLAKE CHEM COM 960413102 10,829 -48,512 -81.75 414 -90.05 0.0002
2020-02-14 2019-12-31 13F WESTLAKE CHEM COM 960413102 59,341 16,582 38.78 4,162 48.54 0.0014
2019-11-14 2019-09-30 13F WESTLAKE CHEM COM 960413102 42,759 -44,613 -51.06 2,802 -53.82 0.0011
2019-08-14 2019-06-30 13F WESTLAKE CHEM COM 960413102 87,372 48,409 124.24 6,068 129.50 0.0023
2019-05-14 2019-03-31 13F WESTLAKE CHEM COM 960413102 38,963 16,489 73.37 2,644 77.81 0.0011
2019-02-14 2018-12-31 13F WESTLAKE CHEM COM 960413102 22,474 -61,473 -73.23 1,487 -78.69 0.0007
2018-11-14 2018-09-30 13F WESTLAKE CHEM COM 960413102 83,947 20,586 32.49 6,977 2.30 0.0028
2018-08-14 2018-06-30 13F WESTLAKE CHEM COM 960413102 63,361 -19,487 -23.52 6,820 -25.94 0.0030
2018-05-15 2018-03-31 13F WESTLAKE CHEM COM 960413102 82,848 72,753 720.68 9,209 756.65 0.0040
2018-02-14 2017-12-31 13F WESTLAKE CHEM COM 960413102 10,095 -101,070 -90.92 1,075 -88.36 0.0004
2017-11-14 2017-09-30 13F WESTLAKE CHEM COM 960413102 111,165 30,995 38.66 9,236 74.00 0.0043
2017-11-14 2017-06-30 13F/A-1 WESTLAKE CHEM COM 960413102 80,170 72,528 949.07 5,308 951.09 0.0027
2017-08-14 2017-06-30 13F WESTLAKE CHEM COM 960413102 80,170 72,528 5,308
2017-11-14 2017-03-31 13F/A-1 WESTLAKE CHEM COM 960413102 7,642 -34,873 -82.03 505 -78.78 0.0003
2017-05-12 2017-03-31 13F WESTLAKE CHEM COM 960413102 7,642 -34,873 505
2017-02-14 2016-12-31 13F WESTLAKE CHEM COM 960413102 42,515 13,855 48.34 2,380 55.25 0.0013
2016-11-14 2016-09-30 13F WESTLAKE CHEM COM 960413102 28,660 -42,564 -59.76 1,533 -49.84 0.0009
2016-08-12 2016-06-30 13F WESTLAKE CHEM COM 960413102 71,224 34,920 96.19 3,056 81.90 0.0019
2016-05-12 2016-03-31 13F WESTLAKE CHEM COM 960413102 36,304 10,103 38.56 1,680 17.98 0.0011
2016-02-16 2015-12-31 13F WESTLAKE CHEM COM 960413102 26,201 -28,463 -52.07 1,424 -49.79 0.0009
2015-11-13 2015-09-30 13F WESTLAKE CHEM COM 960413102 54,664 5,809 11.89 2,836 -15.37 0.0020
2015-08-14 2015-06-30 13F WESTLAKE CHEM COM 960413102 48,855 -8,931 -15.46 3,351 -19.39 0.0022
2015-05-14 2015-03-31 13F WESTLAKE CHEM COM 960413102 57,786 6,964 13.70 4,157 33.88 0.0029
2015-02-17 2014-12-31 13F WESTLAKE CHEM COM 960413102 50,822 50,822 3,105 0.0022
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
(%)
2018-11-14 2018-09-30 13F WESTLAKE CHEM COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-08-14 2018-06-30 13F WESTLAKE CHEM COM Call 15,000 1,614 n/a n/a n/a
2015-05-14 2015-03-31 13F WESTLAKE CHEM COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2015-02-17 2014-12-31 13F WESTLAKE CHEM COM Call 100 6 n/a n/a n/a
Disclosed Put 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
(%)
2025-02-14 2024-12-31 13F WESTLAKE COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-11-14 2024-09-30 13F WESTLAKE COM Put 59,900 9,002 n/a n/a n/a
2019-11-14 2019-09-30 13F WESTLAKE CHEM COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-08-14 2019-06-30 13F WESTLAKE CHEM COM Put 50,000 108.33 3,473 113.20 n/a n/a n/a
2019-05-14 2019-03-31 13F WESTLAKE CHEM COM Put 24,000 0.00 1,629 2.58 n/a n/a n/a
2019-02-14 2018-12-31 13F WESTLAKE CHEM COM Put 24,000 1,588 n/a n/a n/a
2018-11-14 2018-09-30 13F WESTLAKE CHEM COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2018-08-14 2018-06-30 13F WESTLAKE CHEM COM Put 15,000 -41.86 1,614 -43.72 n/a n/a n/a
2018-05-15 2018-03-31 13F WESTLAKE CHEM COM Put 25,800 2,868 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.