Occidental Petroleum Corporation
US ˙ NYSE ˙ US6745991058

SecurityOXY / Occidental Petroleum Corporation
InstitutionRobeco Institutional Asset Management B.V.
Latest Disclosed Ownership128,535 shares
Latest Disclosed Value $ 8,354,775
Robeco Institutional Asset Management B.V. ownership in OXY / Occidental Petroleum Corporation

On April 21, 2026 - Robeco Institutional Asset Management B.V. filed a 13F-HR form disclosing ownership of 128,535 shares of Occidental Petroleum Corporation (US:OXY) valued at $8,354,775 USD as of March 31, 2026. The entity filed a previous 13F-HR on April 23, 2025 disclosing 0 shares of Occidental Petroleum Corporation. The current value of the position is $7,317,498 USD.

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)
2026-04-21 2026-03-31 13F OCCIDENTAL PETE COM 674599105 128,535 128,535 8,355 0.0119
2025-04-23 2025-03-31 13F OCCIDENTAL PETE COM 674599105 0 -33,052 -100.00 0 -100.00
2025-01-23 2024-12-31 13F OCCIDENTAL PETE COM 674599105 33,052 33,052 1,633 0.0031
2024-04-24 2024-03-31 13F OCCIDENTAL PETE COM 674599105 0 -10,832 -100.00 0 -100.00
2024-02-14 2023-12-31 13F/A-1 OCCIDENTAL PETE COM 674599105 10,832 -2,079 -16.10 647 -22.82 0.0016
2024-02-08 2023-12-31 13F OCCIDENTAL PETE COM 674599105 0 -12,911 11 0.0020
2023-10-24 2023-09-30 13F OCCIDENTAL PETE COM 674599105 12,911 0 0.00 838 10.28 0.0022
2023-07-24 2023-06-30 13F OCCIDENTAL PETE COM 674599105 12,911 -3,520 -21.42 759 -25.95 0.0020
2023-05-04 2023-03-31 13F OCCIDENTAL PETE COM 674599105 16,431 -109,596 -86.96 1,026 -87.09 0.0028
2023-02-07 2022-12-31 13F OCCIDENTAL PETE COM 674599105 126,027 -294,722 -70.05 7,938 -69.30 0.0229
2022-12-01 2022-09-30 13F/A-1 OCCIDENTAL PETE COM 674599105 420,749 -53,140 -11.21 25,856 -7.34 0.0836
2022-10-27 2022-09-30 13F OCCIDENTAL PETE COM 674599105 420,749 -53,140 25,856 0.0824
2022-12-01 2022-06-30 13F/A-1 OCCIDENTAL PETE COM 674599105 473,889 -85,910 -15.35 27,904 -12.15 0.0867
2022-07-27 2022-06-30 13F OCCIDENTAL PETE COM 674599105 473,889 -85,910 27,904 0.0855
2022-12-01 2022-03-31 13F/A-1 OCCIDENTAL PETE COM 674599105 559,799 -34,452 -5.80 31,764 84.37 0.0748
2022-04-26 2022-03-31 13F OCCIDENTAL PETE COM 674599105 559,799 -34,452 31,764 0.0739
2022-12-01 2021-12-31 13F/A-1 OCCIDENTAL PETE COM 674599105 594,251 290,077 95.37 17,228 91.49 0.0367
2022-01-31 2021-12-31 13F OCCIDENTAL PETE COM 674599105 594,251 290,077 17,228 0.0362
2022-12-01 2021-09-30 13F/A-1 OCCIDENTAL PETE COM 674599105 304,174 61,728 25.46 8,997 18.71 0.0199
2021-10-20 2021-09-30 13F OCCIDENTAL PETE COM 674599105 304,174 61,728 8,997 0.0197
2022-12-01 2021-06-30 13F/A-1 OCCIDENTAL PETE COM 674599105 242,446 -3,909 -1.59 7,579 15.60 0.0168
2021-07-28 2021-06-30 13F OCCIDENTAL PETE COM 674599105 242,446 -3,909 7,579 0.0166
2022-12-01 2021-03-31 13F/A-1 OCCIDENTAL PETE COM 674599105 246,355 11,215 4.77 6,556 61.12 0.0162
2021-04-23 2021-03-31 13F OCCIDENTAL PETE COM 674599105 246,355 11,215 6,556 0.0159
2022-12-01 2020-12-31 13F/A-1 OCCIDENTAL PETE COM 674599105 235,140 98,567 72.17 4,069 197.88 0.0107
2021-01-28 2020-12-31 13F OCCIDENTAL PETE COM 674599105 235,140 98,567 4,069 0.0106
2021-01-19 2020-09-30 13F/A-1 OCCIDENTAL PETE COM 674599105 136,573 -89,736 -39.65 1,366 -67.03 0.0042
2020-10-29 2020-09-30 13F OCCIDENTAL PETE COM 674599105 136,573 -89,736 1,366 4,218.6526
2021-01-19 2020-06-30 13F/A-1 OCCIDENTAL PETE COM 674599105 226,309 -8,478 -3.61 4,143 52.43 0.0141
2020-07-20 2020-06-30 13F OCCIDENTAL PETE COM 674599105 226,309 -8,478 4,143 14,057.9380
2021-01-19 2020-03-31 13F/A-1 OCCIDENTAL PETE COM 674599105 234,787 -5,043 -2.10 2,718 -72.50 0.0109
2020-04-30 2020-03-31 13F OCCIDENTAL PETE COM 674599105 234,787 -5,043 2,718 10,894.3570
2021-01-19 2019-12-31 13F/A-1 OCCIDENTAL PETE COM 674599105 239,830 -39,742 -14.22 9,884 -20.51 0.0316
2020-02-06 2019-12-31 13F OCCIDENTAL PETE COM 674599105 239,830 -39,742 9,884 31,613.2139
2021-01-19 2019-09-30 13F/A-1 OCCIDENTAL PETE COM 674599105 279,572 -880,873 -75.91 12,435 -78.69 0.0439
2019-10-17 2019-09-30 13F OCCIDENTAL PETE COM 674599105 279,572 -880,873 12,435 43,838.4889
2021-01-19 2019-06-30 13F/A-1 OCCIDENTAL PETE COM 674599105 1,160,445 -235,178 -16.85 58,345 -36.85 0.2060
2019-07-19 2019-06-30 13F OCCIDENTAL PETE COM 674599105 1,160,445 -235,178 58,345 205,739.7312
2021-01-19 2019-03-31 13F/A-1 OCCIDENTAL PETE COM 674599105 1,395,623 -231,706 -14.24 92,393 -7.48 0.3398
2019-05-02 2019-03-31 13F OCCIDENTAL PETE COM 674599105 1,395,623 -231,706 92,393 339,234.2287
2021-01-19 2018-12-31 13F/A-1 OCCIDENTAL PETE CORP DEL COM 674599105 1,627,329 920 0.06 99,860 -25.37 0.4484
2019-02-08 2018-12-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 1,627,329 920 99,860 447,617.5014
2021-01-19 2018-09-30 13F/A-1 OCCIDENTAL PETE CORP DEL COM 674599105 1,626,409 263,621 19.34 133,805 17.17 0.5299
2018-10-25 2018-09-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 1,625,755 262,967 133,751
2021-01-19 2018-06-30 13F/A-1 OCCIDENTAL PETE CORP DEL COM 674599105 1,362,788 686,144 101.40 114,197 158.91 0.5202
2018-08-03 2018-06-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 1,362,788 686,144 114,197
2021-01-19 2018-03-31 13F/A-1 OCCIDENTAL PETE CORP DEL COM 674599105 676,644 592,239 701.66 44,106 608.30 0.2070
2018-05-07 2018-03-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 676,644 592,239 44,106 206,263.1299
2021-01-19 2017-12-31 13F/A-1 OCCIDENTAL PETE CORP DEL COM 674599105 84,405 44,017 108.99 6,227 140.05 0.0323
2018-01-25 2017-12-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 84,405 44,017 6,227
2021-01-19 2017-09-30 13F/A-1 OCCIDENTAL PETE CORP DEL COM 674599105 40,388 24,482 153.92 2,594 172.48 0.0161
2017-10-17 2017-09-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 40,388 24,482 2,594 16,070.7400
2021-01-19 2017-06-30 13F/A-1 OCCIDENTAL PETE CORP DEL COM 674599105 15,906 -650 -3.93 952 -9.16 0.0061
2017-08-07 2017-06-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 15,906 -650 952 6,198.2867
2021-01-19 2017-03-31 13F/A-1 OCCIDENTAL PETE CORP DEL COM 674599105 16,556 0 0.00 1,048 -11.11 0.0070
2017-05-15 2017-03-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 16,556 0 1,048 6,960.7527
2017-02-09 2016-12-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 16,556 -37,125 -69.16 1,179 -69.88 0.0092
2016-11-07 2016-09-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 53,681 -16,859 -23.90 3,914 -26.58 0.0289
2016-07-22 2016-06-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 70,540 1,757 2.55 5,331 13.28 0.0404
2016-05-16 2016-03-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 68,783 -31,576 -31.46 4,706 -30.63 0.0378
2016-02-08 2015-12-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 100,359 -1,103,833 -91.67 6,784 -91.48 0.0580
2015-11-12 2015-09-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 1,204,192 175,101 17.02 79,657 -0.47 0.6068
2015-08-17 2015-06-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 1,029,091 426,565 70.80 80,032 81.97 0.6075
2015-04-24 2015-03-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 602,526 -57,740 -8.74 43,982 -17.37 0.3307
2015-02-12 2014-12-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 660,266 38,421 6.18 53,225 -10.98 0.3816
2014-11-10 2014-09-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 621,845 -120,435 -16.23 59,790 -21.51 0.4271
2014-08-13 2014-06-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 742,280 81,137 12.27 76,180 20.92 0.5451
2014-05-07 2014-03-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 661,143 119,598 22.08 63,000 22.32 0.4833
2014-02-04 2013-12-31 13F OCCIDENTAL PETE CORP DEL COM 674599105 541,545 50,816 10.36 51,503 12.20 0.4280
2013-11-12 2013-09-30 13F OCCIDENTAL PETE CORP DEL COM 674599105 490,729 8,996 1.87 45,903 6.78 0.4459
2013-08-27 2013-06-30 13F Occidental Petroleum COM 674599105 481,733 481,733 42,987 0.4349
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.