PartnerFacts
Data last updated: Oct 23, 2026, 5:45 PM ETLatest filing: Oct 22, 2026Now: Oct 24, 2026, 10:25 AM ET

Sponsor Check › Sponsor group

Y

Yorktown

One sponsor team, 20 deal companies · New York, NY

Grouped because: 10 shared people, same business address (18 issuers), similar issuer names (12), same person name on both filings (1) (automatic match from the filings) · not the same sponsor?

20deal companies
$2.72Breported sold
793investors
24Form D filings
2010–2026active
1new, last 12 mo
Follow this sponsor groupLook further ↓

Data last updated Oct 23, 2026, 5:45 PM ET · Latest filing in this group Apr 27, 2026 · Courts (RECAP) last checked: Oct 24, 2026, 2:16 AM ET · SEC enforcement last checked: covered by the index scan as of Oct 24, 2026, 2:50 AM ET

The short version

Yorktown is a sponsor group of 20 issuers that PartnerFacts links to one sponsor (shared people, same business address, similar issuer names, same person name on both filings; automatic match from the filings), filing 24 Form D filings between Oct 2010 and Apr 2026.

What this means One team, 20 deal companies, about 16 years of track record in SEC filings. We link the companies because the same people or address appear on their forms — tap "Request a correction" if that is wrong.

Combined reported sold: $2.72B to 793 investors (latest filing per issuer). Industries as reported: Pooled Investment Fund (15), Oil and Gas (4), "Other" (1). Issuers are based in NY (14), TX (3), CO (3).

What this means $2.72B raised across the group, about $3.43M per investor. Amounts come from each company's latest Form D; they are what the sponsor reported, not audited figures.

Principal people: Peter A Leidel (15 issuers, executive officer and director), W Howard Keenan (14 issuers, executive officer and director), Robert A Signorino (13 issuers, executive officer and director), Tomas R LaCosta (13 issuers, executive officer and director), Bryan H Lawrence (12 issuers, executive officer and director) and 27 more.

What this means The person on the most companies is usually the one running the show; their page lists every deal.

Activity: 1 new offering in the last 12 months; latest filing Apr 27, 2026.

What this means still raising money this year.

Public records searched: federal courts (CourtListener / RECAP), SEC enforcement releases, state securities regulators (AK, AL, AR, AZ, CA, CO, CT, DC, DE, FINRA, FL, GA, HI, ID, IL, KS, KY, LA, MA, MD, ME, MI, MO, MS, MT, NASAA, NC, ND, NH, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, WA, WI, WV, WY), property records (NYC, FL, IL and TX counties) — 17 court cases matching the name, 10 bankruptcy cases matching the name listed in Key records below.

What this means 27 records came back. Each one is listed below with a link to the original document and a line saying why it matched. A name match is not proof it is the same person or company — read the why line and the document. Being sued or named in a release is an accusation, not a finding.

We compared 24 public filings for Yorktown and found 12 differences, 4 worth asking the sponsor about: 29% of the money raised went to insiders; 13 other issuers file from the same address; and more below.

What this means These are differences between the sponsor's own SEC filings — both values, dates and sources are listed in Key records, section 4. Most have ordinary explanations; ask the sponsor.

What the community is saying

Community search for Yorktown has not run yet — it is joining a line of 53,844 names; searches run around the clock at the hosts' allowed rate. Searched so far: 641 names.

Community comments are quoted as written by their authors. Sources searched: Bing (site:reddit.com / site:biggerpockets.com) and Reddit's own search, plus DuckDuckGo/Brave/BiggerPockets search when they are answering.

Key records

Five things investors ask first. Items still in human review are counted, not shown.

1. Lawsuits

17 cases: 16 closed (disposition not in docket feed), 1 dismissed

C & M Resources, LLC v. Extraction Oil & Gas, Inc. closed
District Court, D. Colorado · No. 1:24-cv-00037 · Filed Jan 5, 2024 · Closed Jul 18, 2024 · Nature of suit: 190 Contract: Other · Cause: 28:1332 Diversity-Breach of Contract
Role of C & M Resources, LLC v. Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2024-07-18 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in the issuer's state (CO)
Sabatini v. Extraction Oil & Gas Inc. closed
District Court, D. Colorado · No. 1:21-cv-02832 · Filed Oct 21, 2021 · Closed Apr 5, 2022 · Nature of suit: 850 Securities, Commodities, Exchange · Cause: 15:0078m(a) - Securities Exchange Act
Role of Sabatini v. Extraction Oil & Gas Inc.: Party · Outcome: Terminated 2022-04-05 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in the issuer's state (CO)
Plumley v. Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:21-cv-01454 · Filed Oct 15, 2021 · Closed Mar 8, 2022 · Nature of suit: 850 Securities/Commodities · Cause: 15:78m(a) Securities Exchange Act
Role of Plumley v. Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2022-03-08 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
Rosenblatt v. Extraction Oil & Gas, Inc. closed
District Court, S.D. New York · No. 1:21-cv-08344 · Filed Oct 8, 2021 · Closed Nov 10, 2021 · Nature of suit: 850 Securities/Commodities · Cause: 15:78m(a) Securities Exchange Act
Role of Rosenblatt v. Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-11-10 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in NY (not the issuer's state)
Harbour v. Extraction Oil & Gas, Inc. closed
District Court, D. Colorado · No. 1:21-cv-02685 · Filed Oct 3, 2021 · Closed Nov 9, 2021 · Nature of suit: 850 Securities, Commodities, Exchange · Cause: 15:78 Securities Exchange Act
Role of Harbour v. Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-11-09 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in the issuer's state (CO)
In re:Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:21-cv-00012 · Filed Jan 6, 2021 · Closed Oct 20, 2021 · Nature of suit: Bankruptcy Appeal (801) · Cause: 28:0158 Bankruptcy Appeal from Judgment/Order
Role of In re:Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-10-20 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In Re: Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01745 · Filed Dec 22, 2020 · Closed Feb 4, 2021
Role of In Re: Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-02-04 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In Re: Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01564 · Filed Nov 20, 2020 · Closed Oct 20, 2021
Role of In Re: Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-10-20 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In re: Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01532 · Filed Nov 16, 2020 · Closed Feb 4, 2021 · Nature of suit: Bankruptcy Appeal (801) · Cause: 28:0158 Bankruptcy Appeal from Judgment/Order
Role of In re: Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-02-04 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In Re:Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01521 · Filed Nov 12, 2020 · Closed Jan 11, 2021
Role of In Re:Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-01-11 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In Re: Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01506 · Filed Nov 9, 2020 · Closed Oct 20, 2021
Role of In Re: Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-10-20 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In Re: Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01456 · Filed Oct 28, 2020 · Closed Jan 12, 2021
Role of In Re: Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-01-12 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In re: Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01458 · Filed Oct 28, 2020 · Closed Jan 11, 2021
Role of In re: Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-01-11 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In re: Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01457 · Filed Oct 28, 2020 · Closed Feb 4, 2021 · Nature of suit: 422 Bankruptcy Appeal (801) · Cause: 28:0158 Bankruptcy Appeal from Judgment/Order
Role of In re: Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-02-04 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In Re: Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01412 · Filed Oct 21, 2020 · Closed Oct 20, 2021 · Nature of suit: Bankruptcy Appeal (801) · Cause: 28:0158 Bankruptcy Appeal from Judgment/Order
Role of In Re: Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-10-20 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
In Re:Extraction Oil & Gas, Inc. closed
District Court, D. Delaware · No. 1:20-cv-01411 · Filed Oct 21, 2020 · Closed Jan 11, 2021
Role of In Re:Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-01-11 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
WildEarth Guardians v. Extraction Oil & Gas, Inc. dismissed
District Court, D. Colorado · No. 1:19-cv-01286 · Filed May 3, 2019 · Closed Jan 20, 2021 · Nature of suit: 893 Environmental Matters · Cause: 42:7604 - Clean Air Act -- Citizen Suit to Enforce Clean Air Act
Role of WildEarth Guardians v. Extraction Oil & Gas, Inc.: Party · Outcome: Terminated 2021-01-20 — FJC Integrated Database disposition: Dismissed: other Docket on CourtListener ↗
company name words appear in the caption; court in the issuer's state (CO)
What was searched

Sources searched: CourtListener bulk data (RECAP dockets as of 2026-09-30; recall-first rule 10-24) — federal district + bankruptcy courts State courts: not covered (one-tap state court links under Look further). PACER: not searched. · Last checked Oct 24, 2026, 2:16 AM ET.

Court records show docket facts only; we never restate allegations as facts. Outcome wording comes from the docket feed; where it does not state a disposition we say so.

State courts: not covered (one-tap state court links under Look further). No state offers a lawful automated statewide source PartnerFacts can use today. Texas (re:SearchTX) terms prohibit storing results in a database open to third parties; New York (WebCivil) and Massachusetts (MassCourts) require a browser check that blocks scripted queries; California has no statewide index (58 county portals; Rule of Court 2.503 grants name-based access case by case); Florida, Utah and Illinois offer paid or partial access whose terms for automated use are unverified. Washington (dw.courts.wa.gov; bulk index reports under a JISC data-dissemination agreement), Delaware (CourtConnect; Court of Chancery not included) and Arizona (apps.azcourts.gov/publicaccess, which has an official channel to request high-volume access) are the candidates; PartnerFacts will request written permission before any automated search. Federal courts are searched through CourtListener / RECAP.

2. Regulatory actions

None found in sources searched — SEC enforcement releases (index scan as of Oct 24, 2026, 2:50 AM ET) · state securities regulators: 48 regulators (FINRA, NASAA, 37 states) — crawled Oct 24, 2026, 8:48 AM ET

What was searched

SEC enforcement searched: SEC litigation releases and administrative proceedings — respondent names in the sec.gov index titles (30,205 releases, 1995-09-19 to 2026-10-23); release text is read only to confirm a candidate. Names that appear only in the body of a release are not found. — Searched SEC litigation releases and administrative proceedings (1995→ / 2007→) (30,205 records as of Oct 24, 2026, 2:50 AM ET) — nothing matched Yorktown..

State securities regulators: Securities regulators searched (64,910 actions): FINRA (38,350 actions, 1995–2026), NASAA (31 actions, 2000–2026; listing starts 1997), AK Division of Banking and Securities (273 actions, 1971–2025), AL Securities Commission (880 actions, 2001–2026), AR Securities Department (1,305 actions, 1998–2026), AZ Corporation Commission Securities Division (411 actions, 2017–2026), CA DFPI (25 actions, 2007–2024; listing starts 2002 — 16 of 12,159 DFPI respondent pages read so far; sponsor-name matches are read first), CO Division of Securities (731 actions, 2001–2026; older years from the Internet Archive (snapshot of 2026-05-02)), CT Department of Banking Securities Division (940 actions, 2006–2026; older years from the Internet Archive (snapshot of 2026-04-22)), DC DISB Securities Bureau (25 actions, 2012–2026), DE DOJ Investor Protection Unit (257 actions, 1987–2026), FL Office of Financial Regulation (49 actions, 2018–2026), GA Secretary of State Securities Division (65 actions, 2015–2026; listing starts 2012), HI DCCA Securities Enforcement Branch (26 actions, 2012–2026), ID Department of Finance Securities Bureau (663 actions, 1994–2026), IL Secretary of State Securities Department (4,122 actions, 2003–2023), KS Insurance Department Securities Division (58 actions), KY Department of Financial Institutions (342 actions, 2005–2026), LA Office of Financial Institutions Securities Division (13 actions, 2010–2025; listing starts 2008), MA Secretary of the Commonwealth Securities Division (125 actions, 2012–2025; live site blocks automated access — loaded from the Internet Archive snapshot of 2026-02-04), MD Attorney General Securities Division (1,054 actions, 2004–2026), ME Office of Securities (539 actions, 2000–2026), MI LARA Corporations, Securities & Commercial Licensing Bureau (201 actions), MO Secretary of State Securities Division (919 actions, 1998–2026), MS Secretary of State Securities Division (209 actions, 1995–2026), MT Commissioner of Securities and Insurance (597 actions, 2000–2026), NC Secretary of State Securities Division (265 actions, 2004–2024), ND Securities Department (711 actions, 1990–2026; the regulator no longer publishes this list live — loaded from the Internet Archive snapshot of 2026-01-06), NH Bureau of Securities Regulation (402 actions, 2002–2026), NM Regulation and Licensing Department Securities Division (90 actions, 2010–2025), NV Secretary of State Securities Division (118 actions, 2018–2026), NY Attorney General Investor Protection Bureau (44 actions, 2012–2026), OH Division of Securities (327 actions, 1993–2006), OK Department of Securities (2,531 actions, 1998–2026), OR Division of Financial Regulation (589 actions, 1988–2026), PA Department of Banking and Securities (1,448 actions, 2008–2024; the regulator no longer publishes this list live — loaded from the Internet Archive snapshot of 2024-08-09), RI DBR Securities Division (98 actions, 2005–2025), SC Attorney General Securities Division (540 actions, 2006–2026), SD Division of Insurance – Securities Regulation (106 actions, 2017–2026), TN Department of Commerce and Insurance Securities Division (405 actions, 1992–2026), TX State Securities Board (936 actions, 1999–2026), UT Division of Securities (772 actions, 2000–2026; older years from the Internet Archive (snapshot of 2010-05-27)), VT DFR Securities Division (137 actions, 2010–2026), WA DFI (2,039 actions, 2001–2026), WI DFI Division of Securities (1,072 actions, 1998–2026), WV Securities Commission (State Auditor) (64 actions), WY Secretary of State Compliance Division (6 actions, 2016–2024) — last crawled Oct 24, 2026, 8:48 AM ET. No machine-readable public listing today for IA, IN, MN, NE, NJ, VA (see docs/state-regulators.md).

3. Bankruptcies

10 cases: 10 closed (disposition not in docket feed)

Leazer v. Extraction Oil & Gas, Inc. closed
United States Bankruptcy Court, D. Delaware · No. 20-50963 · Filed Oct 26, 2020 · Closed Sep 21, 2021
Role of Leazer v. Extraction Oil & Gas, Inc.: Party · Outcome: Case closed 2021-09-21 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
Extraction Oil & Gas, Inc. v. Rocky Mountain Midstream LLC closed
United States Bankruptcy Court, D. Delaware · No. 20-50840 · Filed Sep 8, 2020 · Closed Jan 27, 2021
Role of Extraction Oil & Gas, Inc. v. Rocky Mountain Midstream LLC: Party · Outcome: Case closed 2021-01-27 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
Extraction Oil & Gas, Inc. v. Elevation Midstream, LLC closed
United States Bankruptcy Court, D. Delaware · No. 20-50839 · Filed Sep 4, 2020 · Closed Feb 13, 2023 · Nature of suit: 91 Declaratory judgment
Role of Extraction Oil & Gas, Inc. v. Elevation Midstream, LLC: Party · Outcome: Case closed 2023-02-13 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
Extraction Oil & Gas, Inc. v. Platte River Midstream, LLC closed
United States Bankruptcy Court, D. Delaware · No. 20-50833 · Filed Aug 25, 2020 · Closed Feb 8, 2021
Role of Extraction Oil & Gas, Inc. v. Platte River Midstream, LLC: Party · Outcome: Case closed 2021-02-08 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
Extraction Oil & Gas, Inc. v. Grand Mesa Pipeline, LLC closed
United States Bankruptcy Court, D. Delaware · No. 20-50816 · Filed Aug 19, 2020 · Closed Feb 16, 2021 · Nature of suit: 91 Declaratory judgment
Role of Extraction Oil & Gas, Inc. v. Grand Mesa Pipeline, LLC: Party · Outcome: Case closed 2021-02-16 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
Extraction Oil & Gas, Inc. v. REP Processing, LLC closed
United States Bankruptcy Court, D. Delaware · No. 20-50813 · Filed Aug 14, 2020 · Closed Jan 27, 2021
Role of Extraction Oil & Gas, Inc. v. REP Processing, LLC: Party · Outcome: Case closed 2021-01-27 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
Extraction Oil & Gas, Inc. closed
United States Bankruptcy Court, D. Delaware · No. 20-11548 · Filed Jun 14, 2020 · Closed Oct 22, 2021
Role of Extraction Oil & Gas, Inc.: Party · Outcome: Case closed 2021-10-22 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in DE (not the issuer's state)
Byman, Chapter 11 Trustee v. Brigham Resources Operating, LLC closed
United States Bankruptcy Court, S.D. Texas · No. 18-03182 · Filed Jul 5, 2018 · Closed Mar 4, 2019
Role of Byman, Chapter 11 Trustee v. Brigham Resources Operating, LLC: Party · Outcome: Case closed 2019-03-04 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
company name words appear in the caption; court in the issuer's state (TX)
Sattin, Trustee v. Yorktown Inc. closed matched at sponsor-group level (Yorktown)
United States Bankruptcy Court, D. Connecticut · No. 00-03158 · Filed Sep 20, 2000 · Closed Feb 1, 2001
Role of Yorktown Inc.: Defendant · Outcome: Case closed 2001-02-01 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
exact company name; name has one distinctive word; court in CT (not the issuer's state); filed 2000, issuer incorporated 2007
Leeds Building Products, Inc. v. Yorktown, Inc. closed matched at sponsor-group level (Yorktown)
United States Bankruptcy Court, N.D. Georgia · No. 93-06851 · Filed Nov 17, 1993 · Closed Jan 30, 1995
Role of Yorktown, Inc.: Defendant · Outcome: Case closed 1995-01-30 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
exact company name; name has one distinctive word; court in GA (not the issuer's state); filed 1993, issuer incorporated 2007
What was searched

Sources searched: Federal bankruptcy courts via CourtListener / RECAP archive (federal district courts, federal bankruptcy courts). State courts: not covered (one-tap state court links under Look further). PACER: not searched (RECAP only). · Last checked Oct 24, 2026, 2:16 AM ET.

Court records show docket facts only; we never restate allegations as facts. Outcome wording comes from the docket feed; where it does not state a disposition we say so.

State courts: not covered (one-tap state court links under Look further). No state offers a lawful automated statewide source PartnerFacts can use today. Texas (re:SearchTX) terms prohibit storing results in a database open to third parties; New York (WebCivil) and Massachusetts (MassCourts) require a browser check that blocks scripted queries; California has no statewide index (58 county portals; Rule of Court 2.503 grants name-based access case by case); Florida, Utah and Illinois offer paid or partial access whose terms for automated use are unverified. Washington (dw.courts.wa.gov; bulk index reports under a JISC data-dissemination agreement), Delaware (CourtConnect; Court of Chancery not included) and Arizona (apps.azcourts.gov/publicaccess, which has an official channel to request high-volume access) are the candidates; PartnerFacts will request written permission before any automated search. Federal courts are searched through CourtListener / RECAP.

4. Differences between public sources

No comparisons published

What is compared

No public statement by this sponsor group has been collected yet, so there is nothing to compare. Sources compared: the sponsor's own website (known from the issuer's own filings — Form C issuer website, EDGAR company profile — an approved profile claim or Form ADV Item 1.I of its matched adviser) · SEC Form D · SEC Form ADV (IAPD) · Internet Archive · No website is on file for this sponsor group yet.

12 differences found between the filings for Yorktown — 4 worth asking about (compared 24 filings on Oct 24, 2026)

Note · Jul 5, 2018 – Mar 4, 2019

Bankruptcy case: Byman, Chapter 11 Trustee v. Brigham Resources Operating, LLC — filed Jul 5, 2018

United States Bankruptcy Court, S.D. Texas docket "Byman, Chapter 11 Trustee v. Brigham Resources Operating, LLC" filed Jul 5, 2018, closed Mar 4, 2019. Brigham Resources, LLC (member issuer) is listed as Party ("Byman, Chapter 11 Trustee v. Brigham Resources Operating, LLC"). Our match estimate: 60%.

What this means A bankruptcy filing was found. Many are old or personal and have nothing to do with the deal — but ask what it was and when it closed.

Docket · United States Bankruptcy Court, S.D. Texas ↗Brigham Resources, LLC — PartnerFacts page ↗
Sources
Note · Nov 20, 2012 – Aug 9, 2016

Bankruptcy case: Trollco, Inc. v. Choury — filed Nov 20, 2012

United States Bankruptcy Court, D. Colorado docket "Trollco, Inc. v. Choury" filed Nov 20, 2012, closed Aug 9, 2016. Mark Choury (listed on the same filings) is listed as Defendant ("Choury"). Our match estimate: 70%.

What this means A bankruptcy filing was found. Many are old or personal and have nothing to do with the deal — but ask what it was and when it closed.

Docket · United States Bankruptcy Court, D. Colorado ↗Mark Choury — PartnerFacts page ↗
Sources
Worth asking · Apr 17, 2013

29% of the money raised went to insiders — Brigham Resources, LLC

The Apr 17, 2013 Form D/A reports $55,326,040 sold and $16,097,365 of the proceeds used for payments to officers, directors or promoters.

What this means The filing reports how much of the money raised was paid to insiders. Over 10% is high for most deals. Ask what it paid for.

Form D/A · Apr 17, 2013 ↗Brigham Resources, LLC — PartnerFacts page ↗
Sources
Worth asking · Apr 17, 2013

29% of the money raised went to insiders — Brigham Resources, LLC

The Apr 17, 2013 Form D reports $55,326,040 sold and $16,097,365 of the proceeds used for payments to officers, directors or promoters.

What this means The filing reports how much of the money raised was paid to insiders. Over 10% is high for most deals. Ask what it paid for.

Form D · Apr 17, 2013 ↗Brigham Resources, LLC — PartnerFacts page ↗
Sources
Note · Apr 17, 2013 – Mar 2, 2016

Yorktown includes 2 deals that stopped filing before reaching their target

Yorktown Energy Partners XI, L.P. (last filing Mar 2, 2016; $0 sold of $1,700,000,000); Brigham Resources, LLC (last filing Apr 17, 2013; $55,326,040 sold of $651,600,000). Each has no filing in more than two years and reported under half its target sold.

What this means An issuer whose last filing is more than two years old and reported under half its target sold. The raise may have closed early or quietly stopped. Ask what happened to each.

Yorktown Energy Partners XI, L.P. — PartnerFacts page ↗Brigham Resources, LLC — PartnerFacts page ↗
Sources
Worth asking · Jan 18, 2024 – May 28, 2025

13 other issuers file from the same address — 2 member issuers (Brigham Royalties Fund I, LP; BROY Bevo PIV, LP)

The address on file, 5914 W. Courtyard Dr., Suite 200, Austin, TX, is used by 15 issuers in our index across 3 sponsor groups; 13 are outside this group. It is not on our registered-agent list, so it may be a shared office or administrator.

What this means Many unrelated companies file from this address. Often a registered agent or a fund administrator; sometimes a shared office. Ask where the team actually works.

Brigham Royalties Fund I, LP — PartnerFacts page ↗BROY Bevo PIV, LP — PartnerFacts page ↗EDGAR filer page · Brigham Royalties Fund I, LP ↗
Sources
Worth asking · Nov 1, 2010 – Jun 4, 2018

12 other issuers file from the same address — 3 member issuers (ULTRAGOLD HOLDINGS LLC; Extraction Oil & Gas Holdings, LLC; Thunder Basin Resources, LLC)

The address on file, 1888 Sherman Street, Suite 780, Denver, CO, is used by 15 issuers in our index across 2 sponsor groups; 12 are outside this group. It is not on our registered-agent list, so it may be a shared office or administrator.

What this means Many unrelated companies file from this address. Often a registered agent or a fund administrator; sometimes a shared office. Ask where the team actually works.

ULTRAGOLD HOLDINGS LLC — PartnerFacts page ↗Extraction Oil & Gas Holdings, LLC — PartnerFacts page ↗Thunder Basin Resources, LLC — PartnerFacts page ↗EDGAR filer page · ULTRAGOLD HOLDINGS LLC ↗
Sources
Note · Oct 5, 2010 – Jan 18, 2024

10 offerings have no amendment in the last 12 months and may still be open

No amendment in the last 12 months on an offering that may still be open — Brigham Royalties Fund I, LP (latest filing Jan 18, 2024) · No amendment in the last 12 months on an offering that may still be open — Yorktown Eagle Partners LLC (latest filing Apr 14, 2023) · No amendment in the last 12 months on an offering that may still be open — Yorktown Midstream Partners, L.P. (latest filing Aug 6, 2020) · No amendment in the last 12 months on an offering that may still be open — Yorktown Renewable Energy Infrastructure Fund, L.P. (latest filing Jan 31, 2020) · No amendment in the last 12 months on an offering that may still be open — Yorktown Energy Partners XII, L.P. (latest filing Oct 15, 2019) · and 5 more

What this means SEC rules expect a yearly amendment while an offering is still going. Ask the sponsor which of these raises have closed.

Form D · Jan 18, 2024 ↗Brigham Royalties Fund I, LP — PartnerFacts page ↗Form D · Apr 14, 2023 ↗Yorktown Eagle Partners LLC — PartnerFacts page ↗
Sources
Note · Apr 17, 2013

Offering amount lowered between filings — Brigham Resources, LLC

The Apr 17, 2013 filing says $651,600,000 offered; the Apr 17, 2013 Form D/A says $650,000,000.

What this means The target raise got smaller. That can mean the plan shrank or the sponsor stopped early. Ask what changed in the deal.

Form D (earlier) · Apr 17, 2013 ↗Form D/A (later) · Apr 17, 2013 ↗Brigham Resources, LLC — PartnerFacts page ↗
Sources
Note · Oct 6, 2010 – Apr 14, 2023

5 people are written more than one way across the filings

Robert A Signorino is written 2 different ways on the filings · Peter A Leidel is written 2 different ways on the filings · Mark A. Erickson is written 2 different ways on the filings · W Howard Keenan is written 2 different ways on the filings · Tomas R LaCosta is written 2 different ways on the filings

What this means Middle names and suffixes come and go on these forms. Check full legal names against your documents.

Form D · Oct 6, 2010 ↗Form D · Apr 14, 2023 ↗Robert A Signorino — PartnerFacts page ↗Form D · Aug 10, 2017 ↗
Sources
Note · Aug 10, 2017 – Jun 4, 2018

Reported revenue range changed between filings — Thunder Basin Resources, LLC

"No Revenues" (Aug 10, 2017); then "Decline to Disclose" (Jun 4, 2018).

What this means This is the size band the issuer picks for itself on the form. A change can mean the business grew or shrank — or that it chose not to say. Ask for current numbers.

Form D · Aug 10, 2017 ↗Form D · Jun 4, 2018 ↗Thunder Basin Resources, LLC — PartnerFacts page ↗
Sources
Note · Oct 6, 2010 – Apr 27, 2026

Member companies list addresses in 3 different states

NY (14), CO (3), TX (3).

What this means The same team filing from more than one place can mean an office move or deals held by different entities. Ask where the sponsor actually operates.

Yorktown — sponsor group page ↗ULTRAGOLD HOLDINGS LLC — PartnerFacts page ↗Brigham Resources, LLC — PartnerFacts page ↗Extraction Oil & Gas Holdings, LLC — PartnerFacts page ↗
Sources
What is compared

What is compared: every Form D and D/A we hold for this subject, side by side — filing dates vs. first-sale dates (the 15-day rule), amendment timing on open offerings (the yearly-amendment expectation), amounts sold, investor counts, offering amounts and minimums across amendments, industry and size bands, addresses, how each person's name and role is written, paid sellers' CRD numbers, and (for groups) where the member companies were formed and sit. Everything is as filed by the issuer; the SEC does not check it. Differences are common and usually have ordinary explanations — we show both values, the dates, and the source so you can ask. As of Oct 24, 2026.

5. Money to insiders

2 of 21 offerings report sales commissions totalling $4,751,744; 2 report finder's fees totalling $1,196,242; 2 report proceeds to related persons totalling $16,601,365. (includes amounts the issuer reported as estimates)

Offering (latest filing)Sales commissionsFinder's feesTo insidersPaid to sell itSource
Apr 27, 2026 D
AK Resources LLC
File 021-581939
$0$0$0None listed on this filingEDGAR ↗
May 28, 2025 D
BROY Bevo PIV, LP
File 021-547388
$0$0$0None listed on this filingEDGAR ↗
Jan 18, 2024 D
Brigham Royalties Fund I, LP
File 021-502885
$0$0$0None listed on this filingEDGAR ↗
Apr 14, 2023 D
Yorktown Eagle Partners LLC
File 021-478989
$0$0$0None listed on this filingEDGAR ↗
Aug 6, 2020 D/A
Yorktown Midstream Partners, L.P.
File 021-345916
$0$0$0None listed on this filingEDGAR ↗
Jan 31, 2020 D
Yorktown Renewable Energy Infrastructure Fund, L.P.
File 021-359437
$0$0$0None listed on this filingEDGAR ↗
Oct 15, 2019 D/A
Yorktown Energy Partners XII, L.P.
File 021-323500
$0$0$0None listed on this filingEDGAR ↗
Jun 4, 2018 D
Thunder Basin Resources, LLC
File 021-313777
$0$180,492 (est.)$0None listed on this filingEDGAR ↗
Apr 6, 2018 D
YT Triple Crown Co Investment Partners, LP
File 021-309573
$0$0$0None listed on this filingEDGAR ↗
Aug 10, 2017 D
Thunder Basin Resources, LLC
File 021-292559
$0$1,015,750 (est.)$504,000 (est.)None listed on this filingEDGAR ↗
Jun 28, 2016 D
Coral Sea Co Investment Partners, L.P.
File 021-265865
$0$0$0None listed on this filingEDGAR ↗
Mar 2, 2016 D
Yorktown Energy Partners XI, L.P.
File 021-258387
$0$0$0
Yorktown Partners LLC will receive a Management Fee based on the amount of assets raised in the offering
None listed on this filingEDGAR ↗
Jun 30, 2015 D
YT Brigham Co Investment Partners, LP
File 021-242806
$0$0$0None listed on this filingEDGAR ↗
Jun 12, 2014 D
Extraction Oil & Gas Holdings, LLC
File 021-219098
$4,719,244$0$0Moelis & Company LLC BrokerCheck CRD 145115 ↗
Financial West Investment Group, Inc. BrokerCheck CRD 16668 ↗		EDGAR ↗
Jun 10, 2014 D
YT Extraction Co Investment Partners, LP
File 021-218896
$0$0$0None listed on this filingEDGAR ↗
May 28, 2013 D
Yorktown Energy Partners X, L.P.
File 021-197125
$0$0$0
Yorktown Partners LLC will receive a Management Fee based on the amount of assets raised in the offering.
None listed on this filingEDGAR ↗
May 24, 2013 D
YTM4 Co Investment Partners, LP
File 021-197032
$0$0$0None listed on this filingEDGAR ↗
Apr 17, 2013 D/A
Brigham Resources, LLC
File 021-195123
$0$0$16,097,365None listed on this filingEDGAR ↗
Nov 1, 2010 D
ULTRAGOLD HOLDINGS LLC
File 021-149826
$32,500$0$0Financial West Group BrokerCheck CRD 16668 ↗
via Joseph Merback (CRD 2156180 ↗)
EDGAR ↗
Oct 20, 2010 D
Yorktown Energy Partners IX, L.P.
File 021-149340
$0$0$0 (est.)
Yorktown Partners LLC will receive a Management Fee based on the amount of assets raised in the offering.
None listed on this filingEDGAR ↗
Oct 6, 2010 D
YTM3 Co Investment Partners, LP
File 021-148632
$0$0$0None listed on this filingEDGAR ↗
How this is counted

Counts come from Form D Items 12–15 on the filings in our index (latest filing per offering; one offering = one SEC file number; an amendment updates its offering rather than adding one). "To insiders" = gross proceeds used for payments to executive officers, directors or promoters. "—" = not reported on that filing. Amounts marked (est.) were reported as estimates. "Paid to sell it" = sales compensation recipients named on that filing (Item 12), each linked to FINRA BrokerCheck when a CRD number is reported.

Counted across all 20 issuers in this group — every filing in our index, latest filing per offering (SEC file number).

Property records 0 documents · 0 ownership records · last checked Oct 24, 2026, 10:16 AM ET · NYC and Cook County lookup still to run

0 recorded documents and 0 ownership records matched to Yorktown in the sources searched.

Not found in sources searched as of Oct 24, 2026, 10:16 AM ET: Hillsborough County FL Clerk of Court Official Records daily index (publicrec.hillsclerk.com D/P/M files), 2 daily files (Oct 14, 2026 to Oct 15, 2026) — loaded Oct 23, 2026, 8:59 PM ET; Harris County TX (HCAD ownership rolls 2005–2026) — 1,032,426 records, loaded Oct 24, 2026, 8:00 AM ET; Dallas County TX (DCAD ownership rolls 2021–2027) — 285,535 records, loaded Oct 24, 2026, 8:20 AM ET; Hillsborough County FL (FL DOR 2026 ownership roll + Clerk recorded-document index Oct 14, 2026 to Oct 15, 2026), Miami-Dade County FL (FL DOR 2026 ownership roll), Broward County FL (FL DOR 2026 ownership roll), Palm Beach County FL (FL DOR 2026 ownership roll) — 514,336 records, loaded Oct 24, 2026, 8:25 AM ET; King County WA (Assessor sale records 0000-00-00–2026-10-14; no owner-of-record names published) — 538,619 records, loaded Oct 24, 2026, 8:27 AM ET; Cook County IL (Assessor sale records 1982–2026 + ownership rolls 1999–2026) — 1,263,035 records, loaded Oct 24, 2026, 9:34 AM ET. Still to be looked up for this group: NYC ACRIS via NYC Open Data (Real Property Parties 636b-3b5g, Master bnx9-e6tj, Legals 8h5j-fqxa, Document Control Codes 7isb-wh4c) · NYC PLUTO ownership via NYC Open Data (64uk-42ks) · Cook County IL Assessor via Cook County Open Data (Parcel Sales wvhk-k5uv; Parcel Addresses 3723-97qp). Records in other counties, and recorder indexes we do not yet cover, were not searched.

Property records coverage: New York City (ACRIS recorded documents and PLUTO ownership, looked up per issuer when its page is viewed; re-checked when the page is viewed again more than 30 days after the last check); Harris County TX (ownership only, no deed, mortgage or sale records; HCAD ownership rolls 2005–2026); Dallas County TX (ownership only, no deed, mortgage or sale records; DCAD ownership rolls 2021–2027); Hillsborough County FL (FL DOR 2026 ownership roll + Clerk recorded-document index Oct 14, 2026 to Oct 15, 2026), Miami-Dade County FL (FL DOR 2026 ownership roll), Broward County FL (FL DOR 2026 ownership roll), Palm Beach County FL (FL DOR 2026 ownership roll); King County WA (Assessor sale records 0000-00-00–2026-10-14; no owner-of-record names published); Cook County IL (Assessor sale records 1982–2026 + ownership rolls 1999–2026); also looked up per issuer when its page is viewed. Recorder indexes (party names on deeds, mortgages and liens) in TX, AZ, NV, CA and WA counties and outside the Clerk index in FL, mortgages and liens outside NYC and Hillsborough County, lis pendens and foreclosure notices everywhere, Los Angeles County CA, Clark County NV, New York City bulk pass (not finished; per-issuer lookups only so far), Maricopa County AZ (loader ready; commercial-purpose statement not yet filed), Salt Lake County UT, and all other counties are not covered — not searched. Last refresh by source: NYC ACRIS via NYC Open Data (Real Property Parties 636b-3b5g, Master bnx9-e6tj, Legals 8h5j-fqxa, Document Control Codes 7isb-wh4c) Oct 24, 2026, 9:34 AM ET; Cook County IL Assessor via Cook County Open Data (Parcel Sales wvhk-k5uv; Parcel Addresses 3723-97qp) Oct 24, 2026, 9:34 AM ET; Cook County IL Assessor via Cook County Open Data (Parcel Sales wvhk-k5uv; Parcel Addresses 3723-97qp) Oct 24, 2026, 8:30 AM ET; King County WA Assessor Real Property Sales extract (EXTR_RPSale.csv) Oct 24, 2026, 8:27 AM ET; Florida DOR NAL roll (Palm Beach 60) Oct 24, 2026, 8:25 AM ET; Florida DOR NAL roll (Broward 16) Oct 24, 2026, 8:24 AM ET; Florida DOR NAL roll (Dade 23) Oct 24, 2026, 8:23 AM ET; Florida DOR NAL roll (Hillsborough 39) Oct 24, 2026, 8:21 AM ET; Dallas Central Appraisal District ACCOUNT_INFO.CSV Oct 24, 2026, 8:20 AM ET; Harris County Appraisal District real_acct.txt Oct 24, 2026, 8:00 AM ET; Hillsborough County FL Clerk daily index Oct 23, 2026, 8:59 PM ET. NYC and Cook County are also looked up per issuer when its page is viewed; the most recent such lookup on this site finished Oct 24, 2026, 3:30 AM ET. Parties are named as the recorder's index names them (role suffixes as recorded); no address, account number or trust date is shown for an individual, and individual owners of record (home ownership) are not matched or shown. Items still in human review are not shown.

Issuers in this group

Why each issuer is here is stated in the "Linked by" column. Low-confidence links are never shown — they wait for human review.

SourceIssuerLinked byLocationIndustryFilingsSold (max)InvestorsMin. investment (latest filing)Active
EDGAR ↗YC YTM3 Co Investment Partners, LPshared people, same business addressNEW YORK, NYPooled Investment Fund1$185,000,00017$3,000,0002010–2010
EDGAR ↗YE Yorktown Energy Partners IX, L.P.shared people, same business address, similar issuer namesNEW YORK, NYPooled Investment Fund1$1,227,500,000105$700,0002010–2010
EDGAR ↗UH ULTRAGOLD HOLDINGS LLCshared people, same person name on both filings, same business addressDENVER, COOther1$2,900,00010$25,0002010–2010
EDGAR ↗BR Brigham Resources, LLCshared people, similar issuer namesAUSTIN, TXOil and Gas2$55,326,04046No minimum reported2013–2013
EDGAR ↗YC YTM4 Co Investment Partners, LPshared people, same business addressNEW YORK, NYPooled Investment Fund1$109,000,00015$2,000,0002013–2013
EDGAR ↗YE Yorktown Energy Partners X, L.P.shared people, same business address, similar issuer namesNEW YORK, NYPooled Investment Fund1$1,600,000148$1,000,0002013–2013
EDGAR ↗YE YT Extraction Co Investment Partners, LPshared people, same business address, similar issuer namesNEW YORK, NYPooled Investment Fund1$62,000,000
offering $62,000,000 · similar: $155,000–$5,250,000
18
similar: 4–27
$250,000
similar: $1,000–$100,000
2014–2014
EDGAR ↗EO Extraction Oil & Gas Holdings, LLCshared people, same person name on both filings, same business address, similar issuer namesDENVER, COOil and Gas1$196,955,494
offering $202,955,397 · similar: $1,050,000–$13,125,000
56
similar: 3–19
$12,077
similar: $11,000–$62,888
2014–2014
EDGAR ↗YB YT Brigham Co Investment Partners, LPshared people, same business address, similar issuer namesNEW YORK, NYPooled Investment Fund1$55,000,000
offering $55,000,000 · similar: $155,000–$5,250,000
11
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2015–2015
EDGAR ↗YE Yorktown Energy Partners XI, L.P.shared people, same business address, similar issuer namesNEW YORK, NYPooled Investment Fund1$0
offering $1,700,000,000 · similar: $155,000–$5,250,000
0
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2016–2016
EDGAR ↗CS Coral Sea Co Investment Partners, L.P.shared people, same business addressNEW YORK, NYPooled Investment Fund1$102,040,816
offering $102,040,816 · similar: $155,000–$5,250,000
4
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2016–2016
EDGAR ↗TB Thunder Basin Resources, LLCsame person name on both filings, same business addressDENVER, COOil and Gas2$48,802,000
offering $7,500,000 · similar: $1,050,000–$13,125,000
16
similar: 3–19
$1,000
similar: $11,000–$62,888
2017–2018
EDGAR ↗YT YT Triple Crown Co Investment Partners, LPshared people, same business addressNEW YORK, NYPooled Investment Fund1$49,000,000
offering $49,000,000 · similar: $155,000–$5,250,000
5
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2018–2018
EDGAR ↗YE Yorktown Energy Partners XII, L.P.shared people, same business address, similar issuer namesNEW YORK, NYPooled Investment Fund2$239,836,842
offering Indefinite · similar: $155,000–$5,250,000
84
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2018–2019
EDGAR ↗YM Yorktown Midstream Partners, L.P.shared people, same business address, similar issuer namesNEW YORK, NYPooled Investment Fund2$138,150,000
offering Indefinite · similar: $155,000–$5,250,000
24
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2019–2020
EDGAR ↗YR Yorktown Renewable Energy Infrastructure Fund, L.P.shared people, same business address, similar issuer namesNEW YORK, NYPooled Investment Fund1$125,000,000
offering Indefinite · similar: $155,000–$5,250,000
2
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2020–2020
EDGAR ↗YE Yorktown Eagle Partners LLCshared people, similar issuer namesNEW YORK, NYPooled Investment Fund1$9,308,000
offering Indefinite · similar: $155,000–$5,250,000
16
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2023–2023
EDGAR ↗BR Brigham Royalties Fund I, LPshared people, same business address, similar issuer namesAUSTIN, TXPooled Investment Fund1$146,452,133
offering $250,000,000 · similar: $155,000–$5,250,000
208
similar: 4–27
$60,000
similar: $1,000–$100,000
2024–2024
EDGAR ↗BB BROY Bevo PIV, LPshared people, same business addressAUSTIN, TXPooled Investment Fund1$0
offering Indefinite · similar: $155,000–$5,250,000
0
similar: 4–27
No minimum reported
similar: $1,000–$100,000
2025–2025
EDGAR ↗AR AK Resources LLCshared people, same business addressNEW YORK, NYOil and Gas1$5,000,000
offering $5,000,000 · similar: $1,050,000–$13,125,000
8
similar: 3–19
$3,000
similar: $11,000–$62,888
2026–2026

"Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Pooled Investment Fund / 506(b) (83,801 filings); Oil and Gas / 506(b) (1,000 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

Timeline of offerings

SourceFiledIssuerFormIndustryOfferedSold
EDGAR ↗Apr 27, 2026AK Resources LLCDOil and Gas$5,000,000$5,000,000
EDGAR ↗May 28, 2025BROY Bevo PIV, LPDPooled Investment FundIndefinite$0
EDGAR ↗Jan 18, 2024Brigham Royalties Fund I, LPDPooled Investment Fund$250,000,000$146,452,133
EDGAR ↗Apr 14, 2023Yorktown Eagle Partners LLCDPooled Investment FundIndefinite$9,308,000
EDGAR ↗Aug 6, 2020Yorktown Midstream Partners, L.P.D/APooled Investment FundIndefinite$138,150,000
EDGAR ↗Jan 31, 2020Yorktown Renewable Energy Infrastructure Fund, L.P.DPooled Investment FundIndefinite$125,000,000
EDGAR ↗Oct 15, 2019Yorktown Energy Partners XII, L.P.D/APooled Investment FundIndefinite$239,836,842
EDGAR ↗Aug 6, 2019Yorktown Midstream Partners, L.P.DPooled Investment FundIndefinite$0
EDGAR ↗Oct 15, 2018Yorktown Energy Partners XII, L.P.DPooled Investment FundIndefinite$0
EDGAR ↗Jun 4, 2018Thunder Basin Resources, LLCDOil and Gas$7,500,000$7,500,000
EDGAR ↗Apr 6, 2018YT Triple Crown Co Investment Partners, LPDPooled Investment Fund$49,000,000$49,000,000
EDGAR ↗Aug 10, 2017Thunder Basin Resources, LLCDOil and Gas$48,802,000$48,802,000
EDGAR ↗Jun 28, 2016Coral Sea Co Investment Partners, L.P.DPooled Investment Fund$102,040,816$102,040,816
EDGAR ↗Mar 2, 2016Yorktown Energy Partners XI, L.P.DPooled Investment Fund$1,700,000,000$0
EDGAR ↗Jun 30, 2015YT Brigham Co Investment Partners, LPDPooled Investment Fund$55,000,000$55,000,000
EDGAR ↗Jun 12, 2014Extraction Oil & Gas Holdings, LLCDOil and Gas$202,955,397$196,955,494
EDGAR ↗Jun 10, 2014YT Extraction Co Investment Partners, LPDPooled Investment Fund$62,000,000$62,000,000
EDGAR ↗May 28, 2013Yorktown Energy Partners X, L.P.DPooled Investment FundIndefinite$1,600,000
EDGAR ↗May 24, 2013YTM4 Co Investment Partners, LPDPooled Investment Fund$109,000,000$109,000,000
EDGAR ↗Apr 17, 2013Brigham Resources, LLCD/AOil and Gas$650,000,000$55,326,040
EDGAR ↗Apr 17, 2013Brigham Resources, LLCDOil and Gas$651,600,000$55,326,040
EDGAR ↗Nov 1, 2010ULTRAGOLD HOLDINGS LLCDOther$3,000,000$2,900,000
EDGAR ↗Oct 20, 2010Yorktown Energy Partners IX, L.P.DPooled Investment FundIndefinite$1,227,500,000
EDGAR ↗Oct 6, 2010YTM3 Co Investment Partners, LPDPooled Investment Fund$185,000,000$185,000,000

Activity: 1 new offering in the last 12 months across all issuers in this group (new offering = a Form D that is not an amendment, D/A) · most recent filing Apr 27, 2026. Industry history, as reported on each offering's latest filing: Previous offerings: Pooled Investment Fund (2010), Other (2010), Oil and Gas (2013), Pooled Investment Fund (2013–2014), Oil and Gas (2014), Pooled Investment Fund (2015–2016), Oil and Gas (2017), Pooled Investment Fund (2018), Oil and Gas (2018), Pooled Investment Fund (2018–2025). Latest offering: Oil and Gas (Apr 27, 2026).

People across the group

NameRolesIssuers hereFirst → last listed
PL Peter A LeidelDirector, Executive Officer15Oct 6, 2010 → Apr 14, 2023
WK W Howard KeenanDirector, Executive Officer14Oct 6, 2010 → Apr 14, 2023
RS Robert A SignorinoDirector, Executive Officer13Oct 6, 2010 → Apr 14, 2023
TL Tomas R LaCostaDirector, Executive Officer13Oct 6, 2010 → Apr 14, 2023
BL Bryan H LawrenceDirector, Executive Officer12Oct 6, 2010 → Apr 27, 2026
JC James C CrainDirector6Mar 2, 2016 → Aug 6, 2020
RR Robert RoosaExecutive Officer3Apr 17, 2013 → May 28, 2025
ME Mark A. EricksonDirector, Executive Officer3Nov 1, 2010 → Jun 4, 2018
BL Bryan R LawrenceDirector2Jun 12, 2014 → Apr 6, 2018
JG John S. GaensbauerDirector2Nov 1, 2010 → Jun 12, 2014
AK Ali A. KourosExecutive Officer1Apr 27, 2026 → Apr 27, 2026
YX Yorktown XII Company LP entityExecutive Officer1Apr 14, 2023 → Apr 14, 2023
BL Bryan LawrenceExecutive Officer1Apr 14, 2023 → Apr 14, 2023
AC Andrew CalerichExecutive Officer, Director1Aug 10, 2017 → Jun 4, 2018
MC Mark ChouryExecutive Officer1Aug 10, 2017 → Jun 4, 2018
JS John ShimpDirector1Aug 10, 2017 → Jun 4, 2018
CF Cay FreihoferDirector1Aug 10, 2017 → Jun 4, 2018
BL Bryan LawrenceDirector1Aug 10, 2017 → Jun 4, 2018
MO Matthew OwensExecutive Officer, Director1Jun 12, 2014 → Jun 12, 2014
PK Peter R. KaganDirector1Apr 17, 2013 → Apr 17, 2013
JL James LevyDirector1Apr 17, 2013 → Apr 17, 2013
ES Eugene ShepherdExecutive Officer, Director1Apr 17, 2013 → Apr 17, 2013
JS J SilvaExecutive Officer1Apr 17, 2013 → Apr 17, 2013
RA Richard AubeDirector1Apr 17, 2013 → Apr 17, 2013
SH Steve HurleyDirector1Apr 17, 2013 → Apr 17, 2013
BB Ben M. BrighamExecutive Officer, Director1Apr 17, 2013 → Apr 17, 2013
RW Richard WilkenDirector1Apr 17, 2013 → Apr 17, 2013
HC Harold CarterDirector1Apr 17, 2013 → Apr 17, 2013
WE W. Durand EpplerDirector1Nov 1, 2010 → Nov 1, 2010
LL Louis-Phillipe LapradeDirector1Nov 1, 2010 → Nov 1, 2010
BB Britt D. BanksDirector1Nov 1, 2010 → Nov 1, 2010
JL Jean LapradeDirector1Nov 1, 2010 → Nov 1, 2010

Business registration (state registry / Secretary of State)

1 of 20 issuers have a matched state registry record — records by status: active 1.

Registries searched: AL (Alabama Secretary of State — Business Entity Records (arc-sos.state.al.us), searched by issuer name, data as of Oct 24, 2026); CO (Colorado Secretary of State — Business Entities in Colorado (data.colorado.gov), data as of Oct 23, 2026); CT (Connecticut Secretary of the State — Business Registry (data.ct.gov), data as of Oct 24, 2026); FL (Florida Department of State, Division of Corporations — quarterly corporate data file (Sunbiz), data as of Oct 7, 2026); NY (New York Department of State — Corporations and Other Entities (data.ny.gov: All Filings + Active Corporations), data as of Oct 20, 2026); OR (Oregon Secretary of State — Active Businesses, All (data.oregon.gov), data as of Oct 20, 2026); PA (Pennsylvania Department of State — Registered Businesses, Current (data.pa.gov), data as of Oct 6, 2026); TX (Texas Comptroller — Active Franchise Taxpayers incl. Secretary of State file data (data.texas.gov), data as of Oct 24, 2026). Registries of other states have not been searched: many publish no bulk file and require a CAPTCHA or bot challenge on their search page, which we do not bypass (Delaware, for example, offers no public bulk file). A registry listing is the state's own record of the entity; it says nothing about the offering itself.

Adviser registration (Form ADV)

Searched SEC Form ADV bulk data (registered + exempt reporting advisers) (24,962 records as of Oct 2, 2026, 8:00 AM ET) — nothing matched Yorktown.

Meta advertising

No Meta Pixel ids or Facebook / Instagram page links on file for Yorktown as of Oct 24, 2026 — the sponsor website is read for them once it is on file (runs automatically). Meta Ad Library: not searched by PartnerFacts (no API access); a one-tap Ad Library search is under Look further.

Other offering types (Regulation A and Regulation Crowdfunding)

Searched SEC Regulation A Data Sets (Forms 1-A, 1-K, 1-Z; 2015 Q2 → 2026 Q3); SEC Crowdfunding Offerings Data Sets (Form C family; 2016 Q2 → 2026 Q3); EDGAR form index for 2026 Q3 → 2026 Q4 (51,358 records as of Oct 23, 2026, 8:41 PM ET) — nothing matched this name.

Public profiles and social

No website or social profile named in Yorktown's SEC filings (Form C, Reg A, Form ADV; checked Oct 24, 2026). Web search for this name: #357,719 of 374,652 in line (1,386 issuers searched so far). One-tap searches: Look further ↓

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Securities regulators

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Business registries

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