Six of 147: Yacktman Is 53.2% of the Tracked Diamondback Stake, and the Verified Cohort Grew 4.2% in a Quarter When the Price Fell 11.1%

GetCoattail Research — The Filing Tape #125. Diamondback Energy surfaced on a trending-stocks screen this week listed as a Strong Buy with three Buy ratings and one Hold, and the filings describe a small, concentrated tracked register that grew modestly in the second quarter: 6 of the 147 superinvestors held the stock at June 30, 2026, totalling 1,905,076 shares, verified against the first quarter for a combined increase of 4.2% among continuing holders. Insiders recorded no purchase in the last year and exactly one in the entire parsed record, Congress has no row at all, and short interest stands at 2.72% of the share count.

The Hype

Diamondback's attention this week is a screen story. The stock appeared on TipRanks' Trending Stocks by Analyst screener — SCHW and SMTC topped the page's order, followed by covered or skipped names including BAC, RKLB, BNY, BLK, ARWR and WCN — listed as a Strong Buy with a price target of $236.21 (15.82% upside as printed), 3 Buy, 1 Hold and 0 Sell ratings, a printed change of +4.84%, a market value of $57.11B as printed, in Energy, dated October 16, 2026. TipRanks Our price file shows the path behind the screen: the stock fell 11.1% in the second quarter, from $197.79 on March 31 to $175.78 on June 30, then rose to $184.71 by October 2 — up 5.1% from the June 30 close, up 22.9% year to date, and 13.6% below the 252-session high of $213.69 (May 4, 2026).

The Tape

For Diamondback Energy — the one hundred and twenty-fifth Filing Tape audit — the tape shows six June holders growing 4.2% on a verified continuing basis, a full market adding shares faster than filers, no insider purchase in a year, no Congress row, a 5% register whose largest position has fallen at every print, and a borrow down sharply since June.

Lens 1 — the superinvestors: six June holders, one at 53.2% of the stake, a verified cohort up 4.2%. We track 149 managers whose 13F portfolios we collect from SEC EDGAR — 147 are in the collection (144 at a June 30 period-end, 3 early filers at September 30, none of them holding this name, so there is no period split) — and the June 30, 2026 register for the common stock (CUSIP 25278X109) is 6 distinct managers holding 1,905,076 shares worth $334,877,213, long only, with no option rows and no debt rows: 3 are labelled DECREASED, 2 INCREASED and 1 NEW. Yacktman Asset Management is the largest: 1,014,114 shares worth $178,260,959 — 53.2% of the tracked stake — at a 2.20% portfolio weight, labelled INCREASED at +1.0% (filed August 11, 2026). The second holder, GQG Partners, holds 587,036 shares (30.8%, NEW, at a 0.19% weight), so the top two hold 84.0% — 1,601,150 shares — between them. The rest are Tortoise Capital Advisors (131,944 shares, INCREASED +155.3%), Arnold Van Den Berg - Century Management (81,302 shares, DECREASED -2.0%, at the register's largest weight, 3.02%), Guinness Asset Management (66,789 shares, DECREASED -10.9%) and Energy Income Partners (23,891 shares, DECREASED -53.4%). The growth verifies row by row under two register methods that agree exactly (methodology): the five continuing holders held 1,264,871 shares at March 31 and 1,318,040 at June 30 (+53,169 shares, +4.2%), with no unverified holder and no exit. The pipeline register rose 50.6% (1,264,871 to 1,905,076 shares) — a different figure from the continuing cohort's +4.2%, differing only because the new holder, GQG Partners, sits in the second register alone. Every row implies $175.78, the June 30 close. 13F figures are as of June 30, 2026, published up to 45 days later.

Lens 2 — institutions: nine more filers reporting 24.54% more shares. At June 30, 2026, 1,190 institutions reported positions, up 9 from 1,181 at March 31 (+0.76%); 1,183 are long. Reported shares rose 24.54%, from 160,853,700 to 200,321,126 (+39,467,426 shares), and reported value rose 10.17% to $35,140,440,703, labelled "reported" because the aggregate includes option rows (methodology). Flow counts agree: 1,010 entered, 1,001 exited, net +9, and the by-CUSIP row matches the by-ticker row on every field. The reported value implies $175.42 against a June 30 close of $175.78 (-0.20%).

Lens 3 — insiders: no purchase in a year, exactly one in the whole record, against 105 sales. The parsed Form 4 record holds 109 filings through October 2, 2026, and it contains exactly one purchase transaction: 2,000 shares for $313,019.80, by 1 buyer, with no officer purchase transaction — so the sole purchase is not an officer purchase, and it is older than the one-year window, which holds no purchase at all. The last 90 days hold 0 purchases and 16 sales: 18,300,509 shares for $3,756,249,395.24, by 9 sellers, 8 of them officer sale transactions, across 15 filings. The one-year window holds 92 sales (46,783,754 shares, $8,900,725,396.61, 11 sellers, 40 officer sale transactions) across 79 filings, and the full record holds 105 sales (46,826,807 shares, $8,906,943,400.30, 11 sellers, 50 officer sale transactions). The sales imply $205.25 per share (90 days), $190.25 (one year) and $190.21 (full record), and the single purchase implies $156.51, each inside its window's close range on our price file — so the dollar totals are cited for every window.

Lens 4 — Congress: no row in any aggregate. The combined record (as of October 3, 2026), the House aggregate (as of October 3, 2026) and the Senate aggregate (as of October 1, 2026) each carry no row for this name. That absence is itself the finding.

Lens 5 — the 5% register: nine filings, and a largest position that has fallen at every print. Our full parse holds 9 SC 13D/G filings matching the site aggregate — 6 SC 13D family (all SC 13D/A), 3 SC 13G family (2 SC 13G, 1 SC 13G/A); 7 amendments, 17 reporter names across 27 reporter rows. The maximum is 35.1%: SGF FANG Holdings, LP printed 101,686,727 shares at 35.1% as of August 13, 2025 (filed August 15, 2025, SC 13D/A) — and Greth Lyndal printed the identical shares and percentage in the same filing, a joint report of one position, never summed; that filing also lists nine further Stephens- and Endeavor-affiliated rows at 0 shares and 0.0%. The SGF print then fell at every step: 99,686,727 at 34.8% (November 28, 2025), 97,686,727 at 34.1% (February 3, 2026), 84,036,722 at 29.9% (March 12, 2026), 74,036,722 at 26.3% (June 4, 2026) and 64,957,047 at 23.2% as of September 16, 2026, in the latest filing (filed September 17, 2026), with Greth Lyndal identical at each step. In the passive family, The Vanguard Group printed 0 shares at 0.0% as of March 13, 2026, Vanguard Capital Management printed 14,701,028 shares at 5.21% as of March 31, 2026, and one SC 13G as of June 30, 2026 carries four Wellington rows on the same 16,420,247 shares — three at 5.8% and Wellington Management Company LLP at 5.7% — again one position, not summed.

Lens 6 — short interest: a borrow down 23.7% since June and 37.8% below its 2022 peak. The latest FINRA settlement, September 15, 2026, records 7,630,501 shares sold short — 2.72% of the 280,024,353 shares outstanding — at 4.09 days to cover, down 7.03% from the prior settlement (8,207,836 on August 31, 2026). Against June 30, 2026 (10,005,127) the latest is down 23.7%, and against a year ago (8,209,666 on September 15, 2025) down 7.1%. The series maximum across 137 settlements is 12,273,997 on November 15, 2022, so the latest sits 37.8% below that peak; the minimum is 2,710,768 on May 28, 2021. The recent path runs 10,005,127 (June 30), 9,172,001 (July 15), 8,265,155 (July 31), 7,605,686 (August 14), 8,207,836 (August 31) and 7,630,501 (September 15) — three falls, a rise, then a fall. The series is published as collected.

The Gap

The narrative arriving this week is an analyst-consensus story: a Strong Buy trending listing, 3 Buy ratings against one Hold and no Sell, a printed target above the last close, on a stock that fell 11.1% in the second quarter and has since recovered 5.1%. The June tape is narrower than the listing. The tracked register is small — six holders — and concentrated, with one holder at 53.2% and the top two at 84.0%; its verified continuing growth of 4.2% is real but modest, the largest holder added only 1.0%, and the register's rise of 50.6% is one new holder, not broad buying. The broad market did add shares — 24.54% more on 9 more filers. The insider record is one-way: no purchase in the last year, a single 2,000-share purchase in the entire 109-filing record, against $8.9 billion of sales over one year. Congress is absent entirely. The largest 5% position has fallen at every print, from 35.1% to 23.2%, while the borrow has eased 23.7% since June. One plausible reading is that the trending case rests on breadth the filings do not show: the tracked money is few and concentrated, insider buying confirmation is absent, and one lens — Congress — is simply empty.

What Would Change the Picture

Nothing above is a recommendation. These filings would change it:

• 1. The 2026Q3 13F season (filing window closing mid-November 2026). All five continuing June holders verify, so the cohort's +4.2% is a clean baseline. Whether Yacktman's 1,014,114-share stake — 53.2% of the tracked total, up only 1.0% in Q2 — moves materially, and whether GQG Partners' new 587,036-share position grows or disappears, decides whether this lens stays concentrated.

• 2. A first insider purchase in a year, or a second in the record. The record holds exactly 1 purchase in 109 filings — none in the last year and none in the last 90 days — against 105 sales.
• 3. A first Congress row in any aggregate. All three aggregates carry no row. A first recorded transaction in any of them would change this lens from absent to present.

• 4. A break in the SGF print series, or a new 5% print above 35.1%. The largest position has fallen at every one of its six prints, from 35.1% as of August 13, 2025 to 23.2% as of September 16, 2026. A print that rises, or any new filing above the 35.1% maximum, would change this lens.
• 5. Short interest back through the June 2026 level in either direction. The borrow stands at 7,630,501 shares, down 23.7% from June, at 2.72% of the share count. A reading back above the June 30, 2026 settlement of 10,005,127 would reverse the summer decline; a move toward the series minimum of 2,710,768 would extend it.

Related reading: Four of 147: One Holder Is 52.2% of the Tracked Waste Connections Stake, and the Verified Cohort Grew 5.5% in a Quarter When the Price Rose 2.6% — Filing Tape #124; Seven of 147: Eagle Capital Holds 78.1% of the Tracked EQT Stake, and the Verified Cohort Grew 168.5% in a Quarter When the Price Fell 16.5% — Filing Tape #123. Diamondback Energy's own page: Diamondback Energy (FANG) on GetCoattail.

Methodology and data notes

• As-of & limits: The lenses rest on different clocks, none live: 13F is a June 30, 2026 snapshot published up to 45 days later; Form 4 runs through October 2, 2026; Congress aggregates run through October 3, 2026 (Senate through October 1, 2026); 13D/G through September 17, 2026; short interest through September 15, 2026; the price file ends October 2, 2026. Five limits are specific to this audit. First, the roster expanded before the recent audits — from 85 managers (83 filing) to 149 (147 filing) — so "of 147" counts are not comparable to earlier pieces' "of 83" figures. Second, this name carries no period split: all six tracked holders sit on a June 30, 2026 period-end and none of the three September 30, 2026 early filers holds this name, so every tracked figure here is a single-date figure. Third, the full pipeline register moved much faster than the continuing cohort: the register rose 50.6% (1,264,871 shares at March 31 to 1,905,076 at June 30) because it contains the new GQG Partners position of 587,036 shares in the second quarter only, while the verified continuing cohort rose 4.2%; both figures are stated wherever the cohort change is cited. Fourth, the Congress lens is empty in all three aggregates — an absence of a row, not a row of zeros — and it is reported as a finding, not omitted. Fifth, the TipRanks screener listing (dated October 16, 2026 on the page for this name) postdates the 13F snapshot and the short-interest series; the listing is known to this audit only from outside coverage, not from our own files, and none of its price figures are cited here beyond the listing's own printed target and market value, which are reported as screen content in The Hype; every other price figure here is from our own price file.
• Superinvestor lens: 147 managers in the collection (of a 149-manager roster; 144 at a June 30, 2026 period-end and 3 early filers at September 30, 2026, none of them holding this name) collected directly from SEC EDGAR Form 13F (managers_13f collection, regenerated October 15, 2026 for the expanded roster); Diamondback positions are counted on the common-stock CUSIP 25278X109, long rows only. Six distinct managers hold a long position at June 30, 2026, totalling 1,905,076 shares worth $334,877,213, with a direction count of 3 DECREASED, 2 INCREASED and 1 NEW, no option rows and no exited manager. Yacktman Asset Management's share of the stake is 53.2% = 1,014,114 / 1,905,076, at a 2.20% portfolio weight; GQG Partners' is 30.8% = 587,036 / 1,905,076, and the top two together are 84.0% = 1,601,150 / 1,905,076. All five continuing holders verify row by row against the first quarter under two independent methods that agree exactly. Under the rule used in the previous audits — a holder's first-quarter row accepted only when its implied shares-change reproduces the EDGAR shares-change label at one decimal place — the verified continuing total is 1,264,871 shares at March 31 moving to 1,318,040 at June 30 (+4.2%): Arnold Van Den Berg - Century Management 82,958 → 81,302 (-2.0%), Yacktman Asset Management 1,003,970 → 1,014,114 (+1.0%), Tortoise Capital Advisors 51,684 → 131,944 (+155.3%), Energy Income Partners 51,283 → 23,891 (-53.4%), Guinness Asset Management 74,976 → 66,789 (-10.9%). Because two recent audits found the generic accession-prefix method failing on shared filing-agent prefixes, the check was also rerun identifying filings by accession (filing total equal to the manager's collection total, unique) and pairing second- and first-quarter filings of the same manager by maximum CUSIP-set overlap under the same agent prefix (Arnold Van Den Berg - Century Management overlap 113 CUSIPs, Yacktman Asset Management 73, Tortoise Capital Advisors 82, Energy Income Partners 83, Guinness Asset Management 139 — each uniquely the maximum); the corrected method returns the identical first-quarter rows, so no correction changes any figure here. The pipeline register then reconciles in both quarters (first quarter: 5 rows and 1,264,871 shares, exactly the verified continuing total, with no exit and no other row; second quarter: 6 rows and 1,905,076 shares = the continuing total of 1,318,040 plus the new GQG Partners position of 587,036 — so the register change of +50.6% differs from the continuing cohort's +4.2% only because of the new holder). Implied per-share value: every long row implies $175.78, the June 30, 2026 close, so the cohort implied price is $175.78, 0.0% against the close. The remaining holders are Tortoise Capital Advisors (131,944 shares, $23,193,116, 0.24% weight, INCREASED +155.3%, filed August 14, 2026), Arnold Van Den Berg - Century Management (81,302 shares, $14,291,324, 3.02% weight, DECREASED -2.0%, filed August 14, 2026), Guinness Asset Management (66,789 shares, $11,740,170, 0.20% weight, DECREASED -10.9%, filed July 29, 2026), Energy Income Partners (23,891 shares, $4,199,560, 0.07% weight, DECREASED -53.4%, filed August 7, 2026) and GQG Partners (587,036 shares, $103,192,084, 0.19% weight, NEW, filed August 12, 2026).
• Full-market lens: SEC Form 13F Data Sets full-market aggregation. The primary table is the full13f collection's by-ticker file (holders = distinct filers reporting the ticker's CUSIP; 1,183 reported long positions out of 1,190 filers). Diamondback carries a single CUSIP in this aggregation (25278X109), and the backfill fixtures' by-CUSIP row matches the by-ticker row exactly on every field — holders (1,190), long holders (1,183), shares (200,321,126), reported value ($35,140,440,703), prior holders (1,181) and prior reported value ($31,895,232,108). The by-ticker file's entered/exited fields (1,010 and 1,001, a net of +9 that matches the change in holder count) are gross flows, so this audit headlines the net change. Reported-value caution: the aggregate value ($35,140,440,703 over 200,321,126 shares) implies $175.42 per share against a June 30, 2026 close of $175.78 in our price file, a gap of -0.20%. The aggregate sums the VALUE of every information-table row — including put and call option rows — while the share count covers long common-stock rows only, so we headline filer and share counts and label dollar values "reported."
• Insider lens: full-parse Form 4 aggregation (agg_by_ticker), record as of October 2, 2026 (109 filings). Sale and purchase counts are transaction-code counts (S and P) in non-derivative rows; grants and exercises are not counted as purchases, and one filing can contain many transaction rows. The 90-day window (July 5 to October 2, 2026) holds 0 purchase transactions and 16 sale transactions (18,300,509 shares, $3,756,249,395.24, 0 buyers, 9 sellers, 8 officer sale transactions) across 15 filings. The one-year window (October 3, 2025 to October 2, 2026) holds 0 purchase transactions and 92 sales (46,783,754 shares, $8,900,725,396.61, 11 sellers, 40 officer sale transactions) across 79 filings, and the full record holds 1 purchase transaction (2,000 shares, $313,019.80, 1 buyer, 0 officer purchase transactions) and 105 sales (46,826,807 shares, $8,906,943,400.30, 11 sellers, 50 officer sale transactions). The site's insider aggregate (90-day window, as of October 19, 2026) matches the full parse's 90-day window for this name exactly: 0 purchases, 16 sale transactions, 9 sellers and $3,756,249,395.24 of sale value on both sides. Window price checks on our price file: the sales imply $205.25 per share in the 90-day window, inside its close range ($173.73 to $211.53); $190.25 over one year, inside its range ($137.29 to $213.69); and $190.21 over the full record, inside its full-period range ($67.88 to $213.69); the single purchase implies $156.51 per share, inside the full-period range — so dollar totals are cited for every window.
• 13D/G lens: full-parse SC 13D/G parsed filings (9 filings matching issuer CIK 1539838 on CUSIP 25278X109: 6 SC 13D family filings, all SC 13D/A, and 3 SC 13G family filings — 2 SC 13G and 1 SC 13G/A, 7 of the 9 amendments), filings through September 17, 2026. The site aggregation carries this name under a ticker-keyed row; that row (9 filings, 6 D-filings, 3 G-filings, 7 amendments, 17 reporters, latest date September 17, 2026, maximum 35.1%, total reported 1,124,563,360 shares) matches the parsed filings on filings, form mix, amendments, latest date, maximum and the cross-date reported total. The total sums reporter rows across filings and dates, so it is a filing-volume total, not a stake; joint reporters printing the same position (SGF FANG Holdings, LP and Greth Lyndal at every SGF step; the four Wellington rows on one filing) are reported exactly as they appear in each file and are never summed. The maximum of 35.1% is SGF FANG Holdings, LP's print of 101,686,727 shares as of August 13, 2025 (filed August 15, 2025, SC 13D/A), with Greth Lyndal identical in the same filing, which also lists nine further affiliated reporter rows at 0 shares and 0.0%; the same SGF/Greth pair then printed 99,686,727 shares at 34.8% as of November 28, 2025 (filed December 2, 2025), 97,686,727 at 34.1% as of February 3, 2026 (filed February 5, 2026), 84,036,722 at 29.9% as of March 12, 2026 (filed March 16, 2026), 74,036,722 at 26.3% as of June 4, 2026 (filed June 5, 2026) and 64,957,047 at 23.2% as of September 16, 2026 (filed September 17, 2026). The passive prints are The Vanguard Group at 0 shares and 0.0% as of March 13, 2026 (filed March 26, 2026, SC 13G/A), Vanguard Capital Management at 14,701,028 shares and 5.21% as of March 31, 2026 (filed April 29, 2026, SC 13G), and the Wellington filing as of June 30, 2026 (filed August 13, 2026, SC 13G) with three reporter rows at 16,420,247 shares and 5.8% and Wellington Management Company LLP at 16,420,247 shares and 5.7%. The parsed coverage for this issuer holds these 9 filings; a 5% holder that has not filed in the covered window would not appear here.
• Congress lens: Senate PTR archive and House PTR archive as maintained on this site. The combined record (as of October 3, 2026) carries no row for this name; the House aggregate (as of October 3, 2026) carries no row; the Senate aggregate (as of October 1, 2026) carries no row. No member count, transaction count or date can be stated for this lens, because the aggregates hold no entry at all — the lens is reported as "None" in the summary table and in the text, as this series requires for an absent lens.
• Short interest lens: FINRA Equity Short Interest files (biweekly settlement dates), collected directly from FINRA's public distribution. This is not the single-name standard case in one respect: the series is every row under symbol FANG (market class NNM on all 137 rows), but the issuer-name field appears in two truncated spellings of the same name — "Diamondback Energy, Inc. Commm" on 39 rows and "Diamondback Energy, Inc. Commo" on 98 rows, FINRA field-truncation variants — covering 137 settlements from January 15, 2021 (7,407,775 shares) to September 15, 2026, with all 137 settlement dates distinct. The latest reading is 7,630,501 shares on September 15, 2026, down 7.03% from the prior settlement (8,207,836 on August 31, 2026), down 23.7% from the June 30, 2026 settlement of 10,005,127 and down 7.1% from the year-ago settlement of 8,209,666 on September 15, 2025, at 4.09 days to cover. The series maximum is 12,273,997 on November 15, 2022 and the series minimum is 2,710,768 on May 28, 2021. Series discontinuity check — none: no single-settlement step in the series reaches 2 times (the largest step is 1.400x, on June 30, 2021) and none falls to 0.5 times or below (the smallest step is 0.700x, on November 30, 2022), and our own daily price file holds no single-day move of 1.5 times or more, or 0.6 times or less, anywhere in its history. Exactly one row in the series carries a FINRA flag — a revision flag ("R") on June 15, 2021, at 3,183,085 shares — and no row carries a stock-split flag. The full series is published as collected, with no smoothing or rebasing. The recent path runs 10,005,127 (June 30), 9,172,001 (July 15), 8,265,155 (July 31), 7,605,686 (August 14), 8,207,836 (August 31) and 7,630,501 (September 15). FINRA publishes each settlement about two weeks after the fact, so the October price action is not yet in this series. The share-count ratio (2.72%) uses the fundamentals file's shares-outstanding figure below.
• Fundamentals note: our fundamentals collection carries Diamondback's revenue of $15,026,000,000, net income of $1,664,000,000 and assets of $71,059,000,000, all three sourced to the financial-series cache and all labelled fiscal 2025, so this name carries no fiscal-vintage split. The file is marked ok for this name, with no missing fields: shares outstanding of 280,024,353 (sourced in the file to the DEI entity-common-stock shares-outstanding count, with a shares-end date of July 31, 2026) and a file-computed market value of $51,798,903,621.55. The file does not flag the issuer as a foreign private issuer, and it carries SIC 1311, Crude Petroleum & Natural Gas, and a Nasdaq listing. The file's price for the name is $184.98 as of October 6, 2026; our daily-close file ends October 2, 2026 at $184.71, and we keep the two files' figures separate rather than blending them.
• Prices: our own daily-close file for FANG through October 2, 2026 ($184.71 close, +22.9% year to date on that file; the 252-session closing high is $213.69 on May 4, 2026, so the last close sits 13.6% below it; the 252-session closing low is $137.29 on November 5, 2025, so the last close sits 34.5% above it; closes of $197.79 at March 31, 2026 and $175.78 at June 30, 2026, a second-quarter change of -11.1%; change from June 30 to October 2 of +5.1%; change from the September 30, 2025 close of $143.10 of +29.1%). The series in our price file begins June 1, 2021 at $86.61 and holds 1,342 rows.
• Market context sources: the TipRanks Trending Stocks by Analyst screener (full-page crawl, October 19, 2026), on which Diamondback followed SCHW and SMTC at the top of the page's order, covered names (BAC, RKLB, JBHT, BNY, BLK, ARWR, WCN, JPM and WFC among them) and skipped names (TSM, IBKR, PNC, EADSF, TTE, FHN, ARBFF and ACN, skipped as recorded in earlier runs; PILBF and WING, skipped in this run as recorded in the selection notes), and was listed as a Strong Buy with a price target of $236.21 (15.82% upside as printed), 3 Buy, 1 Hold and 0 Sell ratings, a printed change of +4.84%, a market value of $57.11B as printed, in Energy, dated October 16, 2026 on the page. Figures we could not confirm were left out; the external items above are reported speech from that outlet, not GetCoattail measurements, and none of its price figures are cited in this audit beyond the screener's printed target and market value as reported in The Hype.
• Diamondback Energy is in the GetCoattail stock-page universe: Diamondback Energy (FANG) stock page. Series data: fang_lens_data.csv · fang_short_interest_series.csv. Earlier audits: Waste Connections · EQT Corp.

Past patterns are not a promise of future results. For education only — not investment advice.

This article describes public filings as of the dates stated. It is not investment advice and makes no recommendation. Filings lag reality: 13F positions are as of June 30, 2026, and later trading is not yet public.

Revision history: v1.0 — October 19, 2026: first publication.