Diamondback Energy, Inc.
US ˙ NasdaqGS ˙ US25278X1090

SecurityFANG / Diamondback Energy, Inc.
InstitutionAviva Plc
Latest Disclosed Ownership164,795 shares
Latest Disclosed Value $ 32,594,803
Aviva Plc reports 2.87% increase in ownership of FANG / Diamondback Energy, Inc.

On May 14, 2026 - Aviva Plc filed a 13F-HR form disclosing ownership of 164,795 shares of Diamondback Energy, Inc. (US:FANG) valued at $32,594,803 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 160,197 shares of Diamondback Energy, Inc.. This represents a change in shares of 2.87% during the quarter. The current value of the position is $34,704,179 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)
2026-05-14 2026-03-31 13F DIAMONDBACK ENERGY COM 25278X109 164,795 4,598 2.87 32,595 35.35 0.0547
2026-02-12 2025-12-31 13F DIAMONDBACK ENERGY COM 25278X109 160,197 8,314 5.47 24,082 10.80 0.0406
2025-11-13 2025-09-30 13F DIAMONDBACK ENERGY COM 25278X109 151,883 9,124 6.39 21,734 10.80 0.0395
2025-08-07 2025-06-30 13F DIAMONDBACK ENERGY COM 25278X109 142,759 9,171 6.87 19,615 -8.16 0.0405
2025-05-15 2025-03-31 13F DIAMONDBACK ENERGY COM 25278X109 133,588 19,135 16.72 21,358 13.91 0.0515
2025-02-13 2024-12-31 13F DIAMONDBACK ENERGY COM 25278X109 114,453 -21,022 -15.52 18,751 -19.72 0.0487
2024-11-14 2024-09-30 13F DIAMONDBACK ENERGY COM 25278X109 135,475 3,149 2.38 23,356 -11.83 0.0605
2024-08-02 2024-06-30 13F DIAMONDBACK ENERGY COM 25278X109 132,326 23,625 21.73 26,490 22.97 0.0734
2024-05-14 2024-03-31 13F DIAMONDBACK ENERGY COM 25278X109 108,701 26,738 32.62 21,541 69.48 0.0709
2024-02-09 2023-12-31 13F DIAMONDBACK ENERGY COM 25278X109 81,963 29,158 55.22 12,711 55.42 0.0456
2023-11-13 2023-09-30 13F DIAMONDBACK ENERGY COM 25278X109 52,805 45,868 661.21 8,178 797.69 0.0344
2023-08-10 2023-06-30 13F DIAMONDBACK ENERGY COM 25278X109 6,937 -125,043 -94.74 911 -94.89 0.0037
2023-05-12 2023-03-31 13F DIAMONDBACK ENERGY COM 25278X109 131,980 -5,073 -3.70 17,840 -4.84 0.0808
2023-02-14 2022-12-31 13F/A-2 DIAMONDBACK ENERGY COM 25278X109 137,053 -9,447 -6.45 18,746 6.23 0.0922
2023-02-10 2022-12-31 13F/A-1 DIAMONDBACK ENERGY COM 25278X109 137,053 -9,447 3,310 0.0158
2023-02-09 2022-12-31 13F DIAMONDBACK ENERGY COM 25278X109 137,053 -9,447 19 0.0901
2022-11-14 2022-09-30 13F DIAMONDBACK ENERGY COM 25278X109 146,500 -7,578 -4.92 17,647 -5.46 0.1017
2022-08-04 2022-06-30 13F DIAMONDBACK ENERGY COM 25278X109 154,078 99,537 182.50 18,667 149.66 0.0993
2022-05-13 2022-03-31 13F DIAMONDBACK ENERGY COM 25278X109 54,541 -20,722 -27.53 7,477 -7.90 0.0374
2022-02-10 2021-12-31 13F DIAMONDBACK ENERGY COM 25278X109 75,263 -2,927 -3.74 8,118 9.67 0.0340
2021-11-12 2021-09-30 13F DIAMONDBACK ENERGY COM 25278X109 78,190 29,702 61.26 7,402 62.61 0.0330
2021-08-10 2021-06-30 13F DIAMONDBACK ENERGY COM 25278X109 48,488 -929 -1.88 4,552 25.36 0.0200
2021-05-13 2021-03-31 13F DIAMONDBACK ENERGY COM 25278X109 49,417 17,552 55.08 3,631 135.47 0.0177
2021-02-10 2020-12-31 13F DIAMONDBACK ENERGY COM 25278X109 31,865 -484 -1.50 1,542 58.32 0.0080
2020-11-12 2020-09-30 13F DIAMONDBACK ENERGY COM 25278X109 32,349 -1,429 -4.23 974 -31.07 0.0057
2020-08-13 2020-06-30 13F/A-1 DIAMONDBACK ENERGY COM 25278X109 33,778 -22,687 -40.18 1,413 -4.46 0.0088
2020-08-13 2020-06-30 13F DIAMONDBACK ENERGY COM 25278X109 33,778 -22,687 1,413 4,277.7570
2020-05-14 2020-03-31 13F DIAMONDBACK ENERGY COM 25278X109 56,465 -5,103 -8.29 1,479 -74.13 0.0108
2020-02-10 2019-12-31 13F DIAMONDBACK ENERGY COM 25278X109 61,568 121 0.20 5,717 3.48 0.0346
2019-11-12 2019-09-30 13F DIAMONDBACK ENERGY COM 25278X109 61,447 2,592 4.40 5,525 -13.85 0.0374
2019-07-30 2019-06-30 13F DIAMONDBACK ENERGY COM 25278X109 58,855 -507 -0.85 6,413 6.40 0.0441
2019-05-14 2019-03-31 13F DIAMONDBACK ENERGY COM 25278X109 59,362 502 0.85 6,027 10.47 0.0404
2019-02-12 2018-12-31 13F DIAMONDBACK ENERGY COM 25278X109 58,860 11,390 23.99 5,456 -14.98 0.0407
2018-11-13 2018-09-30 13F DIAMONDBACK ENERGY COM 25278X109 47,470 -1,770 -3.59 6,417 -0.96 0.0352
2018-08-01 2018-06-30 13F DIAMONDBACK ENERGY COM 25278X109 49,240 -320 -0.65 6,479 3.33 0.0382
2018-05-14 2018-03-31 13F DIAMONDBACK ENERGY COM 25278X109 49,560 49,560 6,270 0.0383
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.