Diamondback Energy, Inc.
US ˙ NasdaqGS ˙ US25278X1090

SecurityFANG / Diamondback Energy, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership297,070 shares
Latest Disclosed Value $ 58,757,489
Citigroup Inc ownership in FANG / Diamondback Energy, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 297,070 shares of Diamondback Energy, Inc. (US:FANG) valued at $58,757,475 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 291,700 shares of Diamondback Energy, Inc.. This represents a change in shares of 1.84% during the quarter. The current value of the position is $62,559,971 USD.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (FANG) in the form of stock options. The firm currently holds call options representing 55,300 of underlying shares valued at $10,937,787 USD and put options representing 99,000 of underlying shares valued at $19,581,210 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

FANG / Diamondback Energy, Inc. Historical Put/Call Ratio
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)
2026-05-11 2026-03-31 13F DIAMONDBACK ENERGY COM 25278X109 297,070 5,370 1.84 58,757 33.99 0.0251
2026-02-13 2025-12-31 13F DIAMONDBACK ENERGY COM 25278X109 291,700 -67,239 -18.73 43,851 -14.63 0.0194
2025-11-10 2025-09-30 13F DIAMONDBACK ENERGY COM 25278X109 358,939 -30,203 -7.76 51,364 -3.94 0.0229
2025-08-11 2025-06-30 13F DIAMONDBACK ENERGY COM 25278X109 389,142 -31,551 -7.50 53,468 -20.51 0.0263
2025-05-12 2025-03-31 13F DIAMONDBACK ENERGY COM 25278X109 420,693 104,304 32.97 67,260 29.76 0.0344
2025-02-12 2024-12-31 13F DIAMONDBACK ENERGY COM 25278X109 316,389 54,261 20.70 51,834 14.70 0.0307
2024-11-12 2024-09-30 13F DIAMONDBACK ENERGY COM 25278X109 262,128 10,023 3.98 45,191 -10.46 0.0262
2024-08-12 2024-06-30 13F DIAMONDBACK ENERGY COM 25278X109 252,105 -146,875 -36.81 50,469 -36.17 0.0323
2024-05-10 2024-03-31 13F DIAMONDBACK ENERGY COM 25278X109 398,980 895 0.22 79,066 28.07 0.0519
2024-02-09 2023-12-31 13F DIAMONDBACK ENERGY COM 25278X109 398,085 229,408 136.00 61,735 136.31 0.0435
2023-12-06 2023-09-30 13F/A-1 DIAMONDBACK ENERGY COM 25278X109 168,677 13,208 8.50 26,125 27.92 0.0195
2023-11-09 2023-09-30 13F DIAMONDBACK ENERGY COM 25278X109 168,677 13,208 26,125 0.0078
2023-08-10 2023-06-30 13F DIAMONDBACK ENERGY COM 25278X109 155,469 -31,040 -16.64 20,422 -18.99 0.0134
2023-05-11 2023-03-31 13F DIAMONDBACK ENERGY COM 25278X109 186,509 -123,609 -39.86 25,210 -40.57 0.0177
2023-02-09 2022-12-31 13F DIAMONDBACK ENERGY COM 25278X109 310,118 -168,860 -35.25 42,418 -26.48 0.0338
2022-11-10 2022-09-30 13F DIAMONDBACK ENERGY COM 25278X109 478,978 31,398 7.02 57,697 6.40 0.0413
2022-08-10 2022-06-30 13F DIAMONDBACK ENERGY COM 25278X109 447,580 235,666 111.21 54,225 86.66 0.0404
2022-05-12 2022-03-31 13F DIAMONDBACK ENERGY COM 25278X109 211,914 20,898 10.94 29,050 41.01 0.0177
2022-02-10 2021-12-31 13F DIAMONDBACK ENERGY COM 25278X109 191,016 18,788 10.91 20,602 26.36 0.0110
2021-11-10 2021-09-30 13F DIAMONDBACK ENERGY COM 25278X109 172,228 -39,598 -18.69 16,304 -18.02 0.0096
2021-08-10 2021-06-30 13F DIAMONDBACK ENERGY COM 25278X109 211,826 14,999 7.62 19,887 37.48 0.0120
2021-05-13 2021-03-31 13F DIAMONDBACK ENERGY COM 25278X109 196,827 -515,341 -72.36 14,465 -58.04 0.0094
2021-02-11 2020-12-31 13F DIAMONDBACK ENERGY COM 25278X109 712,168 339,850 91.28 34,470 207.38 0.0203
2020-11-12 2020-09-30 13F DIAMONDBACK ENERGY COM 25278X109 372,318 156,257 72.32 11,214 24.10 0.0073
2020-08-12 2020-06-30 13F DIAMONDBACK ENERGY COM 25278X109 216,061 33,826 18.56 9,036 89.28 0.0071
2020-05-12 2020-03-31 13F DIAMONDBACK ENERGY COM 25278X109 182,235 51,980 39.91 4,774 -60.53 0.0043
2020-02-12 2019-12-31 13F DIAMONDBACK ENERGY COM 25278X109 130,255 4,849 3.87 12,095 7.28 0.0088
2019-11-08 2019-09-30 13F DIAMONDBACK ENERGY COM 25278X109 125,406 9,035 7.76 11,274 -11.10 0.0089
2019-08-12 2019-06-30 13F DIAMONDBACK ENERGY COM 25278X109 116,371 52,255 81.50 12,681 94.79 0.0102
2019-05-13 2019-03-31 13F DIAMONDBACK ENERGY COM 25278X109 64,116 -64,478 -50.14 6,510 -45.40 0.0063
2019-02-12 2018-12-31 13F DIAMONDBACK ENERGY COM 25278X109 128,594 108,609 543.45 11,922 341.39 0.0121
2018-11-13 2018-09-30 13F DIAMONDBACK ENERGY COM 25278X109 19,985 -62,739 -75.84 2,701 -75.18 0.0024
2018-08-10 2018-06-30 13F DIAMONDBACK ENERGY COM 25278X109 82,724 41,901 102.64 10,884 110.69 0.0100
2018-05-11 2018-03-31 13F DIAMONDBACK ENERGY COM 25278X109 40,823 19,148 88.34 5,166 88.82 0.0043
2018-02-12 2017-12-31 13F DIAMONDBACK ENERGY COM 25278X109 21,675 -29,682 -57.80 2,736 -45.61 0.0022
2017-11-13 2017-09-30 13F DIAMONDBACK ENERGY COM 25278X109 51,357 36,018 234.81 5,030 269.04 0.0041
2017-08-11 2017-06-30 13F DIAMONDBACK ENERGY COM 25278X109 15,339 -252 -1.62 1,363 -15.71 0.0012
2017-05-12 2017-03-31 13F DIAMONDBACK ENERGY COM 25278X109 15,591 3,061 24.43 1,617 27.73 0.0014
2017-02-10 2016-12-31 13F DIAMONDBACK ENERGY COM 25278X109 12,530 3,269 35.30 1,266 41.61 0.0011
2016-11-10 2016-09-30 13F DIAMONDBACK ENERGY COM 25278X109 9,261 3,051 49.13 894 57.67 0.0008
2016-08-12 2016-06-30 13F DIAMONDBACK ENERGY COM 25278X109 6,210 -2,426 -28.09 567 -14.99 0.0006
2016-05-13 2016-03-31 13F DIAMONDBACK ENERGY COM 25278X109 8,636 4,930 133.03 667 167.87 0.0007
2016-02-12 2015-12-31 13F DIAMONDBACK ENERGY COM 25278X109 3,706 -440 -10.61 249 -6.74 0.0002
2015-11-13 2015-09-30 13F DIAMONDBACK ENERGY COM 25278X109 4,146 522 14.40 267 -2.20 0.0002
2015-08-13 2015-06-30 13F DIAMONDBACK ENERGY COM 25278X109 3,624 -6,214 -63.16 273 -63.89 0.0002
2015-05-14 2015-03-31 13F DIAMONDBACK ENERGY COM 25278X109 9,838 121 1.25 756 30.34 0.0007
2015-02-17 2014-12-31 13F DIAMONDBACK ENERGY COM 25278X109 9,717 -188,509 -95.10 580 -96.09 0.0005
2014-11-14 2014-09-30 13F DIAMONDBACK ENERGY COM 25278X109 198,226 177,756 868.37 14,824 715.85 0.0130
2014-08-14 2014-06-30 13F DIAMONDBACK ENERGY COM 25278X109 20,470 14,213 227.15 1,817 330.57 0.0017
2014-05-15 2014-03-31 13F DIAMONDBACK ENERGY COM 25278X109 6,257 -157 -2.45 422 24.48 0.0004
2014-02-14 2013-12-31 13F DIAMONDBACK ENERGY COM 25278X109 6,414 6,388 24,569.23 339 33,800.00 0.0003
2013-11-14 2013-09-30 13F DIAMONDBACK ENERGY COM 25278X109 26 -1,816 -98.59 1 -98.36 0.0000
2013-08-14 2013-06-30 13F DIAMONDBACK ENERGY COM 25278X109 1,842 1,842 61 0.0001
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-11 2026-03-31 13F DIAMONDBACK ENERGY COM Call 55,300 -65.93 10,938 -55.17 n/a n/a n/a
2026-02-13 2025-12-31 13F DIAMONDBACK ENERGY COM Call 162,300 -20.09 24,399 -16.05 n/a n/a n/a
2025-11-10 2025-09-30 13F DIAMONDBACK ENERGY COM Call 203,100 170.80 29,064 182.03 n/a n/a n/a
2025-08-11 2025-06-30 13F DIAMONDBACK ENERGY COM Call 75,000 0.00 10,305 -14.06 n/a n/a n/a
2025-05-12 2025-03-31 13F DIAMONDBACK ENERGY COM Call 75,000 650.00 11,991 632.05 n/a n/a n/a
2025-02-12 2024-12-31 13F DIAMONDBACK ENERGY COM Call 10,000 0.00 1,638 -4.99 n/a n/a n/a
2024-11-12 2024-09-30 13F DIAMONDBACK ENERGY COM Call 10,000 0.00 1,724 -13.84 n/a n/a n/a
2024-08-12 2024-06-30 13F DIAMONDBACK ENERGY COM Call 10,000 0.00 2,002 1.01 n/a n/a n/a
2024-05-10 2024-03-31 13F DIAMONDBACK ENERGY COM Call 10,000 0.00 1,982 27.81 n/a n/a n/a
2024-02-09 2023-12-31 13F DIAMONDBACK ENERGY COM Call 10,000 0.00 1,551 0.13 n/a n/a n/a
2023-12-06 2023-09-30 13F/A DIAMONDBACK ENERGY COM Call 10,000 1,549 n/a n/a n/a
2023-11-09 2023-09-30 13F DIAMONDBACK ENERGY COM Call 10,000 1,549 n/a n/a n/a
2022-05-12 2022-03-31 13F DIAMONDBACK ENERGY COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-10 2021-12-31 13F DIAMONDBACK ENERGY COM Call 37,500 127.27 4,044 158.90 n/a n/a n/a
2021-11-10 2021-09-30 13F DIAMONDBACK ENERGY COM Call 16,500 1,562 n/a n/a n/a
2021-08-10 2021-06-30 13F DIAMONDBACK ENERGY COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-05-13 2021-03-31 13F DIAMONDBACK ENERGY COM Call 2,000 -97.75 147 -96.59 n/a n/a n/a
2021-02-11 2020-12-31 13F DIAMONDBACK ENERGY COM Call 89,000 4.95 4,308 68.61 n/a n/a n/a
2020-11-12 2020-09-30 13F DIAMONDBACK ENERGY COM Call 84,800 -30.38 2,555 -49.84 n/a n/a n/a
2020-08-12 2020-06-30 13F DIAMONDBACK ENERGY COM Call 121,800 64.59 5,094 162.71 n/a n/a n/a
2020-05-12 2020-03-31 13F DIAMONDBACK ENERGY COM Call 74,000 47.65 1,939 -58.34 n/a n/a n/a
2020-02-12 2019-12-31 13F DIAMONDBACK ENERGY COM Call 50,120 136.82 4,654 144.56 n/a n/a n/a
2019-11-08 2019-09-30 13F DIAMONDBACK ENERGY COM Call 21,164 -20.33 1,903 -34.27 n/a n/a n/a
2019-08-12 2019-06-30 13F DIAMONDBACK ENERGY COM Call 26,564 34.22 2,895 44.10 n/a n/a n/a
2019-05-13 2019-03-31 13F DIAMONDBACK ENERGY COM Call 19,792 -65.91 2,009 -62.68 n/a n/a n/a
2019-02-12 2018-12-31 13F DIAMONDBACK ENERGY COM Call 58,064 372.07 5,383 223.69 n/a n/a n/a
2018-11-13 2018-09-30 13F DIAMONDBACK ENERGY COM Call 12,300 108.47 1,663 114.30 n/a n/a n/a
2018-08-10 2018-06-30 13F DIAMONDBACK ENERGY COM Call 5,900 -16.90 776 -13.59 n/a n/a n/a
2018-05-11 2018-03-31 13F DIAMONDBACK ENERGY COM Call 7,100 -87.61 898 -87.59 n/a n/a n/a
2018-02-12 2017-12-31 13F DIAMONDBACK ENERGY COM Call 57,300 522.83 7,235 703.00 n/a n/a n/a
2017-11-13 2017-09-30 13F DIAMONDBACK ENERGY COM Call 9,200 53.33 901 69.04 n/a n/a n/a
2017-08-11 2017-06-30 13F DIAMONDBACK ENERGY COM Call 6,000 -16.67 533 -28.65 n/a n/a n/a
2017-05-12 2017-03-31 13F DIAMONDBACK ENERGY COM Call 7,200 620.00 747 639.60 n/a n/a n/a
2017-02-10 2016-12-31 13F DIAMONDBACK ENERGY COM Call 1,000 -33.33 101 -30.34 n/a n/a n/a
2016-11-10 2016-09-30 13F DIAMONDBACK ENERGY COM Call 1,500 -46.43 145 -43.14 n/a n/a n/a
2016-08-12 2016-06-30 13F DIAMONDBACK ENERGY COM Call 2,800 2,700.00 255 3,087.50 n/a n/a n/a
2016-05-13 2016-03-31 13F DIAMONDBACK ENERGY COM Call 100 -75.00 8 -70.37 n/a n/a n/a
2016-02-12 2015-12-31 13F DIAMONDBACK ENERGY COM Call 400 -82.61 27 -81.88 n/a n/a n/a
2015-11-13 2015-09-30 13F DIAMONDBACK ENERGY COM Call 2,300 149 n/a n/a n/a
2015-08-13 2015-06-30 13F DIAMONDBACK ENERGY COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2015-05-14 2015-03-31 13F DIAMONDBACK ENERGY COM Call 14,000 1,076 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-11 2026-03-31 13F DIAMONDBACK ENERGY COM Put 99,000 -60.71 19,581 -48.31 n/a n/a n/a
2026-02-13 2025-12-31 13F DIAMONDBACK ENERGY COM Put 252,000 0.00 37,883 5.05 n/a n/a n/a
2025-11-10 2025-09-30 13F DIAMONDBACK ENERGY COM Put 252,000 64.71 36,061 71.54 n/a n/a n/a
2025-08-11 2025-06-30 13F DIAMONDBACK ENERGY COM Put 153,000 -24.44 21,022 -35.07 n/a n/a n/a
2025-05-12 2025-03-31 13F DIAMONDBACK ENERGY COM Put 202,500 177.40 32,376 170.72 n/a n/a n/a
2025-02-12 2024-12-31 13F DIAMONDBACK ENERGY COM Put 73,000 0.00 11,960 -4.97 n/a n/a n/a
2024-11-12 2024-09-30 13F DIAMONDBACK ENERGY COM Put 73,000 0.00 12,585 -13.88 n/a n/a n/a
2024-08-12 2024-06-30 13F DIAMONDBACK ENERGY COM Put 73,000 0.00 14,614 1.02 n/a n/a n/a
2024-05-10 2024-03-31 13F DIAMONDBACK ENERGY COM Put 73,000 14,466 n/a n/a n/a
2021-08-10 2021-06-30 13F DIAMONDBACK ENERGY COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-05-13 2021-03-31 13F DIAMONDBACK ENERGY COM Put 100,000 12.99 7,349 71.55 n/a n/a n/a
2021-02-11 2020-12-31 13F DIAMONDBACK ENERGY COM Put 88,500 -16.19 4,284 34.67 n/a n/a n/a
2020-11-12 2020-09-30 13F DIAMONDBACK ENERGY COM Put 105,600 -18.46 3,181 -41.27 n/a n/a n/a
2020-08-12 2020-06-30 13F DIAMONDBACK ENERGY COM Put 129,500 85.80 5,416 196.60 n/a n/a n/a
2020-05-12 2020-03-31 13F DIAMONDBACK ENERGY COM Put 69,700 11.88 1,826 -68.43 n/a n/a n/a
2020-02-12 2019-12-31 13F DIAMONDBACK ENERGY COM Put 62,300 -0.86 5,784 2.37 n/a n/a n/a
2019-11-08 2019-09-30 13F DIAMONDBACK ENERGY COM Put 62,840 24.67 5,650 2.86 n/a n/a n/a
2019-08-12 2019-06-30 13F DIAMONDBACK ENERGY COM Put 50,404 217.65 5,493 240.97 n/a n/a n/a
2019-05-13 2019-03-31 13F DIAMONDBACK ENERGY COM Put 15,868 -75.16 1,611 -72.79 n/a n/a n/a
2019-02-12 2018-12-31 13F DIAMONDBACK ENERGY COM Put 63,868 75.46 5,921 20.32 n/a n/a n/a
2018-11-13 2018-09-30 13F DIAMONDBACK ENERGY COM Put 36,400 200.83 4,921 209.11 n/a n/a n/a
2018-08-10 2018-06-30 13F DIAMONDBACK ENERGY COM Put 12,100 572.22 1,592 598.25 n/a n/a n/a
2018-05-11 2018-03-31 13F DIAMONDBACK ENERGY COM Put 1,800 -67.27 228 -67.15 n/a n/a n/a
2018-02-12 2017-12-31 13F DIAMONDBACK ENERGY COM Put 5,500 34.15 694 72.64 n/a n/a n/a
2017-11-13 2017-09-30 13F DIAMONDBACK ENERGY COM Put 4,100 -53.93 402 -49.11 n/a n/a n/a
2017-08-11 2017-06-30 13F DIAMONDBACK ENERGY COM Put 8,900 790.00 790 659.62 n/a n/a n/a
2017-05-12 2017-03-31 13F DIAMONDBACK ENERGY COM Put 1,000 -80.77 104 -80.23 n/a n/a n/a
2017-02-10 2016-12-31 13F DIAMONDBACK ENERGY COM Put 5,200 -10.34 526 -6.07 n/a n/a n/a
2016-11-10 2016-09-30 13F DIAMONDBACK ENERGY COM Put 5,800 -82.04 560 -80.99 n/a n/a n/a
2016-08-12 2016-06-30 13F DIAMONDBACK ENERGY COM Put 32,300 2,836.36 2,946 3,365.88 n/a n/a n/a
2016-05-13 2016-03-31 13F DIAMONDBACK ENERGY COM Put 1,100 0.00 85 14.86 n/a n/a n/a
2016-02-12 2015-12-31 13F DIAMONDBACK ENERGY COM Put 1,100 450.00 74 469.23 n/a n/a n/a
2015-11-13 2015-09-30 13F DIAMONDBACK ENERGY COM Put 200 13 n/a n/a n/a
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.