Latest filingSep 14, 2026Most recent Form 4
FANG
Diamondback Energy, Inc.
NasdaqEnergyCrude Petroleum & Natural Gas
Insider activity for last month from 08/15 to 09/15. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$397M4 sells
Net open-market-$397M4 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period5transactions
- S · Open-market sells · dominant4 · 80%
- F · Tax withholding1 · 20%
Activity by reported role
A joint filing can contribute to multiple roles7transactions
- Chief executive officer · dominant2 · 29%
- EV2 · 29%
- CE1 · 14%
- COO1 · 14%
- Director1 · 14%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (3)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeVan't Hof Matthew KaesCommon Stock · Direct
116,440Aug 20, 2026
Wesson Daniel NCommon Stock · Direct
70,789Aug 20, 2026
Plaumann Mark LawrenceCommon Stock · Direct
12,437Aug 21, 2026
Barkmann AlbertCommon Stock · Direct
23,889Sep 10, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 15 → Sep 15
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Top insiders
By absolute net value across the selected period- VK-$2.1M
- WN-$1.6M
- PL-$210.6k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
FANG transaction history
Filters apply within this company and selected period by defaultLatest insider transactions
Form 4 filings from last month. Click any column to sort; click it again to flip the order.
| ID | Ticker | Insider | Role | Type | Shares | Value | Code | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|
| #83432 | FANG | Van't Hof Matthew Kaes | CEO | sale | 500 | -$10.7M | S | 08/24 | 08/20 |
| #83431 | FANG | Van't Hof Matthew Kaes | CEO | sale | 9.50k | -$203M | S | 08/24 | 08/20 |
| #83427 | FANG | Wesson Daniel N | EVCOO | sale | 7.50k | -$161M | S | 08/24 | 08/20 |
| #83423 | FANG | Plaumann Mark Lawrence | DIR | sale | 1.00k | -$21.0M | S | 08/24 | 08/21 |
Diamondback Energy, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Diamondback Energy, Inc.?
Barkmann Albert, Van't Hof Matthew Kaes, Wesson Daniel N, Plaumann Mark Lawrence.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Plaumann Mark Lawrence reported a sale on Aug 21, 2026 valued at $21.0M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $3,971,238.60. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.