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Private equityFirmbuyoutlower middle market

Mainline Investment Advisers, LLC

Private Equity

Wynnewood, PA

MainLine Investment Partners focuses on alternative investments in operating businesses & special opportunity real estate assets.

This is the graph view. The full profile, with its team, deals and sources, is on Private Equity.Open the full profile →

Search this name across graphsid dfx:pe:68df1909-f073-4a61-b0ae-397fb3f693fa

Data as of Sep 17, 2026 (this record's last observation) from federal regulator filings, firm and issuer disclosures. Page built Sep 20, 2026, 1:55 AM UTC and rebuilt at most every 15 minutes.

Relationships: 40
Dated events: 40
On other graphs: 5
Observed: Sep 13, 2026 to Sep 17, 2026
31 observations

Across DFX

same identity by shared identifier, citation, or a bridge measured by hand

Venture Capitalidentity

Mainline Investment Advisers, LLC

Venture manager · shared crd

Independent Sponsorsidentity

Mainline Investment Advisers, LLC

Capital provider to sponsors · shared crd

RIA / Wealth Managementidentity

MAINLINE INVESTMENT ADVISERS, LLC

Registered adviser · shared crd

Private Creditidentity

MAINLINE INVESTMENT ADVISERS, LLC

Private credit manager · shared crd

Real Estate Fundsidentity

Mainline Investment Advisers, LLC

Real estate fund manager · shared crd

Facts

fact = as filed or announced; derived = computed by DFX; estimate = a band, never a point

Funds: 27
PE funds: 27
Vintages: 2014 to 2018
PE GAV, 2024 filing: $226Mgross asset value on Form ADV; never dry powder
Regulatory AUM: $245M
Investments: 0
Active investments: 0
Size band: LOWER MIDDLE MARKETderivedproxy: $0.23bn Private Equity Fund GAV on the Form ADV filed 2024-07-19
Stated sectors: real_estate
Latest ADV filing: Jul 19, 2024
Employees (ADV): 6
Website: mainlineco.com

Funds

Fund	Vintage	Lifecycle	ADV type	Form D sold	GAV
MLH Altmed, LLC	2018	Wound down	Private Equity Fund	n/a	$10.8M
MLH Holdings, LLC	2018	Harvest	Private Equity Fund	n/a	$177M
Mlip Mlh Investments, LLC	2018	Harvest	Private Equity Fund	n/a	$47.9M
Mainline Special Opportunities Fund, L.P.	2014	Harvest	Private Equity Fund	n/a	$16,579
Mainline So/unequal Partners, L.P.	2014	Harvest	Private Equity Fund	n/a	$54,326
Cms/gennx360 Capital Fund, L.P.	n/a	Wound down	Private Equity Fund	n/a	$1.2M
Cms/llm Preferred Equity Partners Q, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
CMS Distressed Opportunities Fund, L.P.	n/a	Unknown	Private Equity Fund	n/a	$0
CMS Private Equity Partners Xviii-Q, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
Cms/krg Capital Fund III, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
CMS Small-Cap Private Equity Fund II, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
CMS Mezzanine Debt Fund Q, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
Cms/krg Capital Fund IV, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
CMS Small-Cap Private Equity Fund Ii-Q, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
CMS Mezzanine Debt Fund, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
CMS Private Equity Partners Xviii, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
Cms/mistral Equity Partners, L.P.	n/a	Wound down	Private Equity Fund	n/a	$19.8M
Cms/cgf IV, L.P.	n/a	Wound down	Private Equity Fund	n/a	$0
CMS Specialty Finance Fund Q, L.P.	n/a	Wound down	Private Equity Fund	n/a	$5.3M
Cms/quad Education Fund Q, L.P.	n/a	Wound down	Private Equity Fund	n/a	$13.6M
CMS Small-Cap Private Equity Fund Q, L.P.	n/a	Harvest	Private Equity Fund	n/a	$0
CMS Specialty Finance Fund, L.P.	n/a	Wound down	Private Equity Fund	n/a	$2.4M
CMS Platinum Fund, L.P.	n/a	Harvest	Private Equity Fund	n/a	$1.2M
CMS Distressed Opportunities Fund Q, L.P.	n/a	Unknown	Private Equity Fund	n/a	$0
CMS Small-Cap Private Equity Fund, L.P.	n/a	Harvest	Private Equity Fund	n/a	$0

Relationships

Employs (8)

→ David Andrew ClapperPersonMember/Partner And Minority Owner
Aug 1, 2011 to presentfactForm ADV, The subject's own site
→ Donna Marie RittershausenPersonChief Compliance Officer
Apr 1, 2021 to presentfactForm ADV, The subject's own site
→ William Alan LandmanPersonManaging Member
Aug 1, 2011 to presentfactForm ADV, The subject's own site
→ Alexander C ChadwickPersonVice President
Aug 1, 2015 to presentfactForm ADV
→ William J RomanelliPersonTreasurer And Vice President, Chief Financial Officer
Mar 1, 2022 to presentfactForm ADV
→ John Tucker AdamsPersonCfo, Treasurer, Vice President
Dec 1, 2014 to Mar 30, 2022inferenceForm ADV
→ Richard Alan MitchellPersonChief Compliance Officer, General Counsel, Vice President And Secretary
Aug 1, 2011 to May 3, 2021inferenceForm ADV
→ Matthew Warren BrownPersonVice President
Aug 1, 2011 to Mar 30, 2021inferenceForm ADV

Firm member (1)

→ Mainline InvestmentFirmAnchor adviser
factDFX's own graph

Manages (27)

→ Mlip Mlh Investments, LLCFundPrivate Equity Fund
Mar 29, 2018 to presentfactForm ADV
→ Mainline So/unequal Partners, L.P.FundPrivate Equity Fund
Mar 28, 2014 to presentfactForm ADV
→ MLH Altmed, LLCFundPrivate Equity Fund
Mar 29, 2018 to presentfactForm ADV
→ MLH Holdings, LLCFundPrivate Equity Fund
Mar 29, 2018 to presentfactForm ADV
→ CMS Private Equity Partners Xviii, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Private Equity Partners Xviii-Q, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Distressed Opportunities Fund, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Distressed Opportunities Fund Q, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Small-Cap Private Equity Fund, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Small-Cap Private Equity Fund Q, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/krg Capital Fund III, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/llm Preferred Equity Partners Q, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/cgf IV, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/quad Education Fund Q, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/north Castle Partners IV, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Platinum Fund, L.P.FundOther Private Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/gennx360 Capital Fund, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Specialty Finance Fund, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Specialty Finance Fund Q, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/pegasus Partners IV, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/mistral Equity Partners, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Cms/krg Capital Fund IV, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Mezzanine Debt Fund, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Mezzanine Debt Fund Q, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Small-Cap Private Equity Fund II, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ CMS Small-Cap Private Equity Fund Ii-Q, L.P.FundPrivate Equity Fund
Jan 24, 2012 to presentfactForm ADV
→ Mainline Special Opportunities Fund, L.P.FundPrivate Equity Fund
Mar 28, 2014 to presentfactForm ADV

Owns (1)

← Mainline Investment Partners, LLCFirmSole Managing Member - 100% Owner
Aug 1, 2011 to presentfactForm ADV

Dated events

32 bookkeeping events (roster, classification and holdings changes) folded below

Occurred
Mar 30, 2022
Person left
John Tucker Adams (Cfo, Treasurer, Vice President) no longer on Schedule A of Mainline Investment Advisers, LLC
Form ADVobserved 6 days ago
Occurred
Mar 1, 2022
Person joined
William J Romanelli joined Schedule A of Mainline Investment Advisers, LLC as Cfo, Treasurer And Vice President
Form ADVobserved 6 days ago
Occurred
May 3, 2021
Person left
Richard Alan Mitchell (Chief Compliance Officer, General Counsel, Vice President And Secretary) no longer on Schedule A of Mainline Investment Advisers, LLC
Form ADVobserved 6 days ago
Occurred
Apr 1, 2021
Person joined
Donna Marie Rittershausen joined Schedule A of Mainline Investment Advisers, LLC as Secretary, Chief Compliance Officer
Form ADVobserved 6 days ago
Occurred
Mar 30, 2021
Person left
Matthew Warren Brown (Vice President) no longer on Schedule A of Mainline Investment Advisers, LLC
Form ADVobserved 6 days ago
Occurred
Aug 1, 2015
Person joined
Alexander C Chadwick joined Schedule A of Mainline Investment Advisers, LLC as Vice President
Form ADVobserved 6 days ago
Occurred
Dec 1, 2014
Person joined
John Tucker Adams joined Schedule A of Mainline Investment Advisers, LLC as Cfo, Treasurer, Vice President
Form ADVobserved 6 days ago
Occurred
Jan 24, 2012
Adviser first adv filing
Mainline Investment Advisers, LLC first filed Form ADV in the extract (IA)
Form ADVobserved 6 days ago

Show 32 bookkeeping events

Occurred
Apr 28, 2026
Mainline Investment Advisers, LLC: Private Equity Funds on Form ADV 5 (2024 extract) -> 7 (roster 2026-09-01)
Occurred
Mar 29, 2024
Fund 805-5658778608 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2024
Fund 805-2025315512 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2024
Fund 805-2764098277 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2024
Fund 805-1586363259 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 30, 2022
Fund 805-9008570319 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 30, 2021
Fund 805-6936317738 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 30, 2021
Fund 805-5687718017 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 30, 2021
Fund 805-2905862324 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 30, 2020
Fund 805-6692379363 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2019
Fund 805-7756743722 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2019
Fund 805-7318521725 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2019
Fund 805-6577470721 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2019
Fund 805-6966042818 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2018
MLH Holdings, LLC first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $20,825,500
Occurred
Mar 29, 2018
Fund 805-8836189868 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 29, 2018
Mlip Mlh Investments, LLC first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $15,390,001
Occurred
Mar 29, 2018
MLH Altmed, LLC first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $10,825,500
Occurred
Mar 24, 2017
Fund 805-1313884979 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 24, 2017
Fund 805-6732424031 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 24, 2017
Fund 805-7919385506 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 24, 2017
Fund 805-2535727085 no longer reported on Form ADV by Mainline Investment Advisers, LLC
Occurred
Mar 28, 2014
Mainline Special Opportunities Fund, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $5,166,000
Occurred
Mar 28, 2014
Mainline So/unequal Partners, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $9,599,000
Occurred
Jan 24, 2012
CMS Small-Cap Private Equity Fund II, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $2,138,895
Occurred
Jan 24, 2012
CMS Mezzanine Debt Fund Q, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $35,696,031
Occurred
Jan 24, 2012
CMS Mezzanine Debt Fund, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $4,086,102
Occurred
Jan 24, 2012
Cms/krg Capital Fund IV, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $29,550,108
Occurred
Jan 24, 2012
Cms/mistral Equity Partners, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $43,946,910
Occurred
Jan 24, 2012
Cms/pegasus Partners IV, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $42,148,352
Occurred
Jan 24, 2012
CMS Specialty Finance Fund Q, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $20,436,314
Occurred
Jan 24, 2012
CMS Specialty Finance Fund, L.P. first reported on Form ADV by Mainline Investment Advisers, LLC (Private Equity Fund), GAV $9,102,163

Who to call

the organisation, the role and the published line, with the filing or website that published it; revealed to signed-in accounts

The firm's published line

Revealable: 1 business phone (Form ADV), 1 office address (Form ADV), 1 website (Form ADV), 1 work email (firm website) · as of 2026-09-17

Also named here, with no published line of their own (reach them through the firm): David Andrew Clapper (Member/Partner And Minority Owner), Donna Marie Rittershausen (Chief Compliance Officer), William Alan Landman (Managing Member), Alexander C Chadwick (Vice President), William J Romanelli (Treasurer And Vice President, Chief Financial Officer).

Who to call is the organisation, the person's role and the line they published themselves: a business phone, office address, website or profile link from Form ADV, Form 13F or their own website, with that source named on every value. The counts above are what a reveal returns; a personal email is rarely published, so most reveals are the firm's line. Never data bought from a provider, never anything personal. Reveals by plan

Provenance

Graph: Private Equity
Canonical id: dfx:pe:68df1909-f073-4a61-b0ae-397fb3f693fa
First observed: Sep 13, 2026
Last observed: Sep 17, 2026 2 days ago
Source families: Federal regulator filings, Firm and issuer disclosures
3 registered feeds stand behind this record; each fact above carries its own dates and, where the publisher serves one, its document.
Resolution: Identity across graphs by shared identifier (CRD, CIK, EIN, ADV fund id, individual CRD) or citation; a name match is shown as a candidate and never merged.

Mainline Investment Advisers, LLC

Private Equity

Wynnewood, PA

MainLine Investment Partners focuses on alternative investments in operating businesses & special opportunity real estate assets.

This is the graph view. The full profile, with its team, deals and sources, is on Private Equity.Open the full profile →

Search this name across graphsid dfx:pe:68df1909-f073-4a61-b0ae-397fb3f693fa

Data as of Sep 17, 2026 (this record's last observation) from federal regulator filings, firm and issuer disclosures. Page built Sep 20, 2026, 1:55 AM UTC and rebuilt at most every 15 minutes.