Diamondback Energy, Inc.
US ˙ NasdaqGS ˙ US25278X1090

SecurityFANG / Diamondback Energy, Inc.
InstitutionTortoise Capital Advisors, L.l.c.
Latest Disclosed Ownership51,684 shares
Latest Disclosed Value $ 10,222,578
Tortoise Capital Advisors, L.l.c. ownership in FANG / Diamondback Energy, Inc.

On May 15, 2026 - Tortoise Capital Advisors, L.l.c. filed a 13F-HR form disclosing ownership of 51,684 shares of Diamondback Energy, Inc. (US:FANG) valued at $10,222,578 USD as of March 31, 2026. The entity filed a previous 13F-HR on November 13, 2025 disclosing 0 shares of Diamondback Energy, Inc.. The current value of the position is $9,955,372 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)
2026-05-15 2026-03-31 13F Diamondback Energy cs 25278X109 51,684 51,684 10,223 0.0588
2025-11-13 2025-09-30 13F Diamondback Energy cs 25278X109 0 -42,137 -100.00 0 -100.00
2025-08-14 2025-06-30 13F Diamondback Energy cs 25278X109 42,137 -21,837 -34.13 5,790 -43.40 0.0755
2025-05-14 2025-03-31 13F Diamondback Energy COM 25278X109 63,974 -17,687 -21.66 10,228 -23.55 0.1237
2025-02-13 2024-12-31 13F Diamondback Energy cs 25278X109 81,661 -18,664 -18.60 13,379 -22.65 0.1713
2024-11-13 2024-09-30 13F Diamondback Energy com 25278X109 100,325 0 0.00 17,296 -13.88 0.2229
2024-08-05 2024-06-30 13F Diamondback Energy cs 25278X109 100,325 -2,604 -2.53 20,084 -1.53 0.2657
2024-05-10 2024-03-31 13F Diamondback Energy cs 25278X109 102,929 -1,454 -1.39 20,397 26.01 0.2849
2024-02-14 2023-12-31 13F Diamondback Energy cs 25278X109 104,383 0 0.00 16,188 0.13 0.2498
2023-11-13 2023-09-30 13F Diamondback Energy cs 25278X109 104,383 0 0.00 16,167 17.91 0.2463
2023-08-14 2023-06-30 13F Diamondback Energy cs 25278X109 104,383 -14 -0.01 13,712 -2.83 0.2091
2023-05-11 2023-03-31 13F Diamondback Energy cs 25278X109 104,397 0 0.00 14,111 -1.18 0.2121
2023-02-13 2022-12-31 13F Diamondback Energy cs 25278X109 104,397 67,187 180.56 14,279 218.59 0.2140
2022-11-14 2022-09-30 13F Diamondback Energy cs 25278X109 37,210 3 0.01 4,482 -0.58 0.0707
2022-08-15 2022-06-30 13F/A-1 Diamondback Energy cs 25278X109 37,207 0 0.00 4,508 -11.61 0.0705
2022-08-10 2022-06-30 13F Diamondback Energy cs 25278X109 37,207 0 4,508 0.0704
2022-05-16 2022-03-31 13F Diamondback Energy cs 25278X109 37,207 0 0.00 5,100 27.09 0.0678
2022-02-14 2021-12-31 13F Diamondback Energy cs 25278X109 37,207 0 0.00 4,013 13.94 0.0606
2021-11-04 2021-09-30 13F Diamondback Energy cs 25278X109 37,207 -2,532 -6.37 3,522 -5.60 0.0569
2021-08-10 2021-06-30 13F Diamondback Energy cs 25278X109 39,739 22 0.06 3,731 27.82 0.0566
2021-05-17 2021-03-31 13F Diamondback Energy cs 25278X109 39,717 0 0.00 2,919 51.87 0.0488
2021-02-16 2020-12-31 13F/A-1 Diamondback Energy cs 25278X109 39,717 0 0.00 1,922 60.70 0.0372
2020-11-13 2020-09-30 13F Diamondback Energy cs 25278X109 39,717 0 0.00 1,196 -28.00 0.0239
2020-08-14 2020-06-30 13F Diamondback Energy cs 25278X109 39,717 -21,423 -35.04 1,661 3.68 0.0267
2020-05-14 2020-03-31 13F/A-1 Diamondback Energy cs 25278X109 61,140 -10,941 -15.18 1,602 -76.06 0.0295
2020-05-14 2020-03-31 13F Diamondback Energy cs 25278X109 61,140 -10,941 1,602 17,940.3353
2020-02-21 2019-12-31 13F/A-2 Diamondback Energy COM 25278X109 72,081 -6,950 -8.79 6,693 -5.81 0.0425
2020-02-19 2019-12-31 13F/A-1 Diamondback Energy COM 25278X109 72,081 0 6,693 0.0412
2020-02-14 2019-12-31 13F Diamondback Energy COM 25278X109 72,081 -6,950 6,693 26,930.9779
2019-11-14 2019-09-30 13F Diamondback Energy COM 25278X109 79,031 -7,906 -9.09 7,106 -24.99 0.0435
2019-08-14 2019-06-30 13F Diamondback Energy COM 25278X109 86,937 5,635 6.93 9,474 14.77 0.0621
2019-05-13 2019-03-31 13F Diamondback Energy COM 25278X109 81,302 -27,242 -25.10 8,255 -17.96 0.0510
2019-02-13 2018-12-31 13F Diamondback Energy COM 25278X109 108,544 -2,617 -2.35 10,062 -33.04 0.0732
2018-12-13 2018-09-30 13F/A-1 Diamondback Energy COM 25278X109 111,161 -4,700 -4.06 15,028 -1.42 0.0877
2018-11-08 2018-09-30 13F Diamondback Energy COM 25278X109 111,161 -4,700 15,028
2018-08-07 2018-06-30 13F Diamondback Energy COM 25278X109 115,861 -21,695 -15.77 15,244 1,509.71 0.0979
2018-05-17 2018-03-31 13F/A-1 Diamondback Energy COM 25278X109 137,556 -9,500 -6.46 947 -94.90 0.0066
2018-05-15 2018-03-31 13F Diamondback Energy COM 25278X109 137,556 947
2018-02-14 2017-12-31 13F Diamondback Energy COM 25278X109 147,056 9,557 6.95 18,566 37.84 0.1218
2017-11-17 2017-09-30 13F/A-1 DIAMONDBACK ENERGY COM 25278X109 137,499 -1,043 -0.75 13,469 9.47 0.0881
2017-11-13 2017-09-30 13F DIAMONDBACK ENERGY COM 25278X109 137,499 -1,043 13,469
2017-11-13 2017-06-30 13F/A-1 DIAMONDBACK ENERGY COM 25278X109 138,542 1,433 1.05 12,304 -13.47 0.0798
2017-08-01 2017-06-30 13F DIAMONDBACK ENERGY COM 25278X109 138,542 1,433 12,304
2017-05-15 2017-03-31 13F DIAMONDBACK ENERGY COM 25278X109 137,109 3,657 2.74 14,220 5.43 0.0872
2017-02-14 2016-12-31 13F DIAMONDBACK ENERGY COM 25278X109 133,452 43,295 48.02 13,487 54.95 0.0867
2016-11-14 2016-09-30 13F DIAMONDBACK ENERGY COM 25278X109 90,157 -1,155 -1.26 8,704 4.50 0.0582
2016-08-11 2016-06-30 13F DIAMONDBACK ENERGY COM 25278X109 91,312 -279 -0.30 8,329 17.82 0.0582
2016-05-13 2016-03-31 13F DIAMONDBACK ENERGY COM 25278X109 91,591 2,231 2.50 7,069 18.25 0.0566
2016-02-12 2015-12-31 13F DIAMONDBACK ENERGY COM 25278X109 89,360 995 1.13 5,978 4.73 0.0504
2015-11-16 2015-09-30 13F DIAMONDBACK ENERGY COM 25278X109 88,365 9,625 12.22 5,708 -3.82 0.0450
2015-08-13 2015-06-30 13F DIAMONDBACK ENERGY COM 25278X109 78,740 64,497 452.83 5,935 442.50 0.0362
2015-05-08 2015-03-31 13F DIAMONDBACK ENERGY COM 25278X109 14,243 14,243 1,094 0.0065
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.