Valero Energy Corporation
MX ˙ BMV ˙ US91913Y1001
SecurityMX:VLO / Valero Energy Corporation
InstitutionCastleark Management Llc
Latest Disclosed Ownership7,380 shares
Latest Disclosed Value $ 1,823,450
Castleark Management Llc reports 58.35% decrease in ownership of VLO / Valero Energy Corporation

On May 15, 2026 - Castleark Management Llc filed a 13F-HR form disclosing ownership of 7,380 shares of Valero Energy Corporation (MX:VLO) valued at $1,823,450 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 17,720 shares of Valero Energy Corporation. This represents a change in shares of -58.35% during the quarter.

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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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)
2026-05-15 2026-03-31 13F VALERO ENERGY COM 91913Y100 7,380 -10,340 -58.35 1,823 -36.79 0.0603
2026-02-12 2025-12-31 13F VALERO ENERGY COM 91913Y100 17,720 0 0.00 2,885 -4.41 0.0847
2025-11-17 2025-09-30 13F VALERO ENERGY COM 91913Y100 17,720 14,160 397.75 3,017 531.17 0.0846
2025-08-18 2025-06-30 13F VALERO ENERGY COM 91913Y100 3,560 -5,850 -62.17 479 -61.51 0.0144
2025-05-15 2025-03-31 13F VALERO ENERGY COM 91913Y100 9,410 6,180 191.33 1,243 214.43 0.0431
2025-02-18 2024-12-31 13F VALERO ENERGY COM 91913Y100 3,230 0 0.00 396 -9.40 0.0138
2024-11-15 2024-09-30 13F VALERO ENERGY COM 91913Y100 3,230 -41,930 -92.85 436 -93.84 0.0178
2024-08-14 2024-06-30 13F VALERO ENERGY COM 91913Y100 45,160 -84,540 -65.18 7,079 -68.02 0.2892
2024-05-16 2024-03-31 13F VALERO ENERGY COM 91913Y100 129,700 123,330 1,936.11 22,138 2,573.67 0.9210
2024-02-15 2023-12-31 13F VALERO ENERGY COM 91913Y100 6,370 -11,070 -63.47 828 -66.49 0.0367
2023-11-15 2023-09-30 13F VALERO ENERGY COM 91913Y100 17,440 2,960 20.44 2,471 45.52 0.1259
2023-08-16 2023-06-30 13F VALERO ENERGY COM 91913Y100 14,480 -1,750 -10.78 1,699 -25.03 0.0769
2023-05-16 2023-03-31 13F VALERO ENERGY COM 91913Y100 16,230 -8,460 -34.26 2,266 -27.68 0.1113
2023-02-10 2022-12-31 13F VALERO ENERGY COM 91913Y100 24,690 0 0.00 3,132 18.73 0.1636
2022-11-15 2022-09-30 13F VALERO ENERGY COM 91913Y100 24,690 -6,010 -19.58 2,638 -19.15 0.1468
2022-08-16 2022-06-30 13F VALERO ENERGY COM 91913Y100 30,700 21,140 221.13 3,263 236.05 0.1746
2022-05-16 2022-03-31 13F VALERO ENERGY COM 91913Y100 9,560 0 0.00 971 35.24 0.0419
2022-02-16 2021-12-31 13F VALERO ENERGY COM 91913Y100 9,560 -3,000 -23.89 718 -18.96 0.0264
2021-11-12 2021-09-30 13F VALERO ENERGY COM 91913Y100 12,560 -20,395 -61.89 886 -65.57 0.0339
2021-08-17 2021-06-30 13F VALERO ENERGY COM 91913Y100 32,955 -5,400 -14.08 2,573 -6.30 0.0864
2021-05-14 2021-03-31 13F VALERO ENERGY COM 91913Y100 38,355 -2,660 -6.49 2,746 18.36 0.0989
2021-02-17 2020-12-31 13F VALERO ENERGY COM 91913Y100 41,015 35,060 588.75 2,320 799.22 0.0868
2020-11-16 2020-09-30 13F VALERO ENERGY COM 91913Y100 5,955 -54,675 -90.18 258 -92.77 0.0101
2020-08-14 2020-06-30 13F VALERO ENERGY COM 91913Y100 60,630 44,900 285.44 3,566 399.44 0.1551
2020-05-13 2020-03-31 13F VALERO ENERGY COM 91913Y100 15,730 -275,975 -94.61 714 -97.39 0.0423
2020-02-14 2019-12-31 13F VALERO ENERGY CORP COM 91913Y100 291,705 231,465 384.24 27,318 432.00 1.0932
2019-11-15 2019-09-30 13F VALERO ENERGY CORP COM 91913Y100 60,240 -13,460 -18.26 5,135 -18.61 0.2095
2019-08-13 2019-06-30 13F VALERO ENERGY CORP COM 91913Y100 73,700 19,850 36.86 6,309 38.11 0.2420
2019-05-14 2019-03-31 13F VALERO ENERGY CORP COM 91913Y100 53,850 41,580 338.88 4,568 396.52 0.1719
2019-02-12 2018-12-31 13F VALERO ENERGY CORP COM 91913Y100 12,270 -320,641 -96.31 920 -97.57 0.0392
2018-11-14 2018-09-30 13F VALERO ENERGY CORP COM 91913Y100 332,911 72,578 27.88 37,869 31.25 1.0882
2018-08-15 2018-06-30 13F VALERO ENERGY CORP COM 91913Y100 260,333 189,483 267.44 28,853 338.96 0.8881
2018-05-14 2018-03-31 13F VALERO ENERGY CORP COM 91913Y100 70,850 25,100 54.86 6,573 56.31 0.2082
2018-02-15 2017-12-31 13F VALERO ENERGY CORP COM 91913Y100 45,750 16,200 54.82 4,205 85.00 0.1262
2017-11-15 2017-09-30 13F VALERO ENERGY CORP COM 91913Y100 29,550 -14,500 -32.92 2,273 -23.52 0.0713
2017-08-15 2017-06-30 13F VALERO ENERGY CORP COM 91913Y100 44,050 -31,130 -41.41 2,972 -40.37 0.0971
2017-05-15 2017-03-31 13F VALERO ENERGY CORP COM 91913Y100 75,180 37,180 97.84 4,984 91.99 0.1562
2017-02-15 2016-12-31 13F VALERO ENERGY CORP COM 91913Y100 38,000 0 0.00 2,596 28.90 0.0828
2016-11-15 2016-09-30 13F VALERO ENERGY CORP COM 91913Y100 38,000 -12,000 -24.00 2,014 -21.02 0.0609
2016-08-10 2016-06-30 13F VALERO ENERGY CORP COM 91913Y100 50,000 -21,670 -30.24 2,550 -44.53 0.0813
2016-05-17 2016-03-31 13F VALERO ENERGY CORP COM 91913Y100 71,670 -81,710 -53.27 4,597 -57.61 0.1436
2016-02-17 2015-12-31 13F VALERO ENERGY CORP COM 91913Y100 153,380 27,000 21.36 10,845 42.79 0.3259
2015-11-17 2015-09-30 13F VALERO ENERGY CORP COM 91913Y100 126,380 -66,200 -34.38 7,595 -37.00 0.2444
2015-08-17 2015-06-30 13F VALERO ENERGY CORP COM 91913Y100 192,580 -14,300 -6.91 12,056 -8.40 0.3221
2015-05-15 2015-03-31 13F VALERO ENERGY CORP COM 91913Y100 206,880 1,790 0.87 13,162 29.65 0.3174
2015-02-10 2014-12-31 13F VALERO ENERGY CORP COM 91913Y100 205,090 62,250 43.58 10,152 33.84 0.2616
2014-11-17 2014-09-30 13F VALERO ENERGY CORP COM 91913Y100 142,840 58,920 70.21 7,585 80.42 0.2157
2014-08-15 2014-06-30 13F VALERO ENERGY CORP COM 91913Y100 83,920 -58,920 -41.25 4,204 -44.57 0.1159
2014-05-20 2014-03-31 13F VALERO ENERGY CORP COM 91913Y100 142,840 19,800 16.09 7,585 22.32 0.2157
2014-02-20 2013-12-31 13F VALERO ENERGY CORP COM 91913Y100 123,040 -24,650 -16.69 6,201 -9.26 0.1800
2014-11-21 2013-09-30 13F/A-1 VALERO ENERGY CORP COM 91913Y100 147,690 -13,030 -8.11 6,834 22.30 0.1927
2013-11-20 2013-09-30 13F VALERO ENERGY CORP COM 91913Y100 94,340 3,222
2013-09-26 2013-06-30 13F VALERO ENERGY COM 91913Y100 160,720 160,720 5,588 0.1854
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.