Diamondback Energy, Inc.
US ˙ NasdaqGS ˙ US25278X1090

SecurityFANG / Diamondback Energy, Inc.
InstitutionHolocene Advisors, LP
Latest Disclosed Ownership523,874 shares
Latest Disclosed Value $ 103,617,038
Holocene Advisors, LP reports 57.92% decrease in ownership of FANG / Diamondback Energy, Inc.

On May 15, 2026 - Holocene Advisors, LP filed a 13F-HR form disclosing ownership of 523,874 shares of Diamondback Energy, Inc. (US:FANG) valued at $103,617,038 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,244,969 shares of Diamondback Energy, Inc.. This represents a change in shares of -57.92% during the quarter. The current value of the position is $110,322,626 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.

Upgrade to unlock premium data and export to Excel .

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 DIAMONDBACK ENERGY COM 25278X109 523,874 -721,095 -57.92 103,617 -44.64 0.2499
2026-02-17 2025-12-31 13F DIAMONDBACK ENERGY COM 25278X109 1,244,969 23,319 1.91 187,156 7.06 0.3930
2025-11-14 2025-09-30 13F DIAMONDBACK ENERGY COM 25278X109 1,221,650 209,731 20.73 174,818 25.73 0.3983
2025-08-14 2025-06-30 13F DIAMONDBACK ENERGY COM 25278X109 1,011,919 70,430 7.48 139,038 -7.63 0.3393
2025-05-15 2025-03-31 13F DIAMONDBACK ENERGY COM 25278X109 941,489 941,489 150,525 0.4391
2025-02-14 2024-12-31 13F DIAMONDBACK ENERGY COM 25278X109 0 -938,474 -100.00 0 -100.00
2024-11-14 2024-09-30 13F DIAMONDBACK ENERGY COM 25278X109 938,474 457,896 95.28 161,793 68.17 0.6534
2024-08-14 2024-06-30 13F DIAMONDBACK ENERGY COM 25278X109 480,578 -281,629 -36.95 96,207 -36.31 0.4016
2024-05-15 2024-03-31 13F DIAMONDBACK ENERGY COM 25278X109 762,207 38,558 5.33 151,047 34.59 0.5547
2024-02-14 2023-12-31 13F DIAMONDBACK ENERGY COM 25278X109 723,649 128,646 21.62 112,223 21.78 0.4373
2023-11-14 2023-09-30 13F DIAMONDBACK ENERGY COM 25278X109 595,003 -380,583 -39.01 92,154 -28.09 0.4035
2023-08-14 2023-06-30 13F DIAMONDBACK ENERGY COM 25278X109 975,586 -228,484 -18.98 128,153 -21.26 0.5469
2023-05-15 2023-03-31 13F DIAMONDBACK ENERGY COM 25278X109 1,204,070 200,081 19.93 162,754 18.52 0.8001
2023-02-14 2022-12-31 13F DIAMONDBACK ENERGY COM 25278X109 1,003,989 -224,909 -18.30 137,326 -7.23 0.8376
2022-11-14 2022-09-30 13F DIAMONDBACK ENERGY COM 25278X109 1,228,898 39,285 3.30 148,033 2.71 0.9458
2022-08-15 2022-06-30 13F DIAMONDBACK ENERGY COM 25278X109 1,189,613 82,114 7.41 144,122 -5.07 0.8704
2022-05-16 2022-03-31 13F DIAMONDBACK ENERGY COM 25278X109 1,107,499 -197,892 -15.16 151,816 7.83 0.7911
2022-02-14 2021-12-31 13F DIAMONDBACK ENERGY COM 25278X109 1,305,391 -110,102 -7.78 140,786 5.06 0.7328
2021-11-15 2021-09-30 13F DIAMONDBACK ENERGY COM 25278X109 1,415,493 1,039,446 276.41 134,005 279.54 0.7282
2021-08-16 2021-06-30 13F DIAMONDBACK ENERGY COM 25278X109 376,047 -360,348 -48.93 35,307 -34.76 0.1994
2021-05-17 2021-03-31 13F DIAMONDBACK ENERGY COM 25278X109 736,395 192,515 35.40 54,118 105.58 0.3394
2021-02-16 2020-12-31 13F DIAMONDBACK ENERGY COM 25278X109 543,880 118,050 27.72 26,324 105.24 0.1661
2020-11-16 2020-09-30 13F DIAMONDBACK ENERGY COM 25278X109 425,830 425,830 12,826 0.0975
2020-08-14 2020-06-30 13F DIAMONDBACK ENERGY COM 25278X109 0 -761,551 -100.00 0 -100.00
2020-05-15 2020-03-31 13F DIAMONDBACK ENERGY COM 25278X109 761,551 761,551 19,953 0.2143
2020-02-14 2019-12-31 13F DIAMONDBACK ENERGY COM 25278X109 0 -388,717 -100.00 0 -100.00
2019-11-14 2019-09-30 13F DIAMONDBACK ENERGY COM 25278X109 388,717 181,985 88.03 34,950 55.14 0.3599
2019-08-14 2019-06-30 13F DIAMONDBACK ENERGY COM 25278X109 206,732 46,732 29.21 22,528 38.68 0.2873
2019-05-15 2019-03-31 13F DIAMONDBACK ENERGY COM 25278X109 160,000 -93,893 -36.98 16,245 -30.98 0.2486
2019-02-14 2018-12-31 13F DIAMONDBACK ENERGY COM 25278X109 253,893 234,296 1,195.57 23,536 788.49 0.3793
2018-11-14 2018-09-30 13F DIAMONDBACK ENERGY COM 25278X109 19,597 17,408 795.25 2,649 819.79 0.0427
2018-08-14 2018-06-30 13F DIAMONDBACK ENERGY COM 25278X109 2,189 2,189 288 0.0061
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.