Firm profile

Diameter Capital Partners LP

NEW YORK, NYCRD 289307Registration Status: ApprovedEffective since August 17, 2017SEC # 801-111022Latest ADV August 27, 2026

Diameter Capital Partners LP is an SEC registered investment adviser organized as a limited partnership with a primary office location in New York, NY. Its latest Form ADV filing, dated August 27, 2026, reports $28.8B in regulatory assets under management, 130 employees, 3 offices, and 44 accounts.

Assets Under Management
$28.8B
Employees
130
Offices
3 offices
Total Clients
44

Associated firm names

1 name listed
  • DIAMETER CAPITAL PARTNERS LP

Leadership

3 roles identified
CCOMichael J. Cohn
CFOMatthew G. Gilmartin
COOMatthew G. Gilmartin

Advisory services offered

1 types reported
Portfolio management for pooled investment vehicles

Fee models offered

2 types reported
Asset based fees
Performance-based fees

Offices & Contact

Primary office

NEW YORK, New York, United States

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Primary office regionOther reported regions

Shading shows states and countries with reported offices. Cities are listed below; shading does not indicate service coverage.

New York

NEW YORKPrimary office

Florida

WEST PALM BEACH

United Kingdom

LONDON

3 office records listed · 3 total offices reported. Counts can use different reporting dates. SEC filers may list only their largest 25 additional offices.

Contact and digital presence

ADV profile links

Regulatory Assets Under Management Breakdown

Total regulatory assets under management$28.8Bas of August 27, 2026
Discretionary100.0%
$28.8B
100% of total RAUM100.0%
Non-discretionary0.0%
$0
0% of total RAUM0.0%
All regulatory assets under management are discretionary.

Client Coverage Demographics

Top client segmentPooled Investment Vehicles represent 100.0% of total clients.
Top client categories% of clientsClients
1
Pooled Investment Vehicles
100.0%
44

Assets under management Growth by Quarter

Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.

Total AUM$28.8B
Total Accounts44
10Y AUM Change+$28.0B (+3672.8%)

Private Funds

Private funds reported by Diameter Capital Partners LP

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Employee Growth by Quarter

Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.

Total Employees130
Clients per Employee0:1
10Y Employee Change+116 (+828.6%)

Historical AUM and employee figures reflect available SEC Form ADV filings under this CRD. Filing gaps may reflect registration status changes, dormant periods, state registration periods, firm restructuring, or other reporting changes. Rialytix does not interpolate missing periods.


Ownership

Reported direct and indirect ownership ranges

Each range applies to a separate reported relationship and should not be added together.

Reported ownership ranges

Highlighted bands show the percentage range reported in Form ADV.

0%25%50%75%100%
SG DIAMETER LLCDirect owner · Schedule AInterest in DIAMETER CAPITAL PARTNERS LP
25% to < 50%
DIAMETER MANAGEMENT INTERMEDIATE LPDirect owner · Schedule AInterest in DIAMETER CAPITAL PARTNERS LP
25% to < 50%
APO INVESTMENT MANAGER AGGREGATOR VEHICLE, L.P.Direct owner · Schedule AInterest in DIAMETER CAPITAL PARTNERS LP
5% to < 10%
SCOTT KREITLER GOODWINDirect owner · Schedule AInterest in DIAMETER CAPITAL PARTNERS LP
< 5%
JONATHAN NMN LEWINSOHNDirect owner · Schedule AInterest in DIAMETER CAPITAL PARTNERS LP
< 5%
DIAMETER CAPITAL PARTNERS GP LLCDirect owner · Schedule AInterest in DIAMETER CAPITAL PARTNERS LP
< 5%
SCOTT KREITLER GOODWINIndirect owner · Schedule BInterest in SG DIAMETER LLC
75%+
JONATHAN NMN LEWINSOHNIndirect owner · Schedule BInterest in DIAMETER MANAGEMENT INTERMEDIATE LP
75%+
SCOTT KREITLER GOODWINIndirect owner · Schedule BInterest in DIAMETER CAPITAL PARTNERS GP LLC
50% to < 75%
JONATHAN NMN LEWINSOHNIndirect owner · Schedule BInterest in DIAMETER CAPITAL PARTNERS GP LLC
50% to < 75%

Bars represent the reported range at that individual ownership step, not an estimated percentage of the advisory firm. Indirect relationships may refer to intermediate entities rather than directly to Diameter Capital Partners LP.

Reported ownership and control details

Form ADV · Filing date 2026-08-27 · Schedules A and B

12 entries
#Owner / person & roleInterest in entityReported interestControl personTitle / status acquiredSource
1SCOTT KREITLER GOODWINCO-FOUNDER,MANAGING MEMBER AND LIMITED PARTNERIndividualDIAMETER CAPITAL PARTNERS LPLess than 5%Code NAYesCO-FOUNDER,MANAGING MEMBER AND LIMITED PARTNER11/2016Schedule APDF page 190
2JONATHAN NMN LEWINSOHNCO-FOUNDER,MANAGING MEMBER AND LIMITED PARTNERIndividualDIAMETER CAPITAL PARTNERS LPLess than 5%Code NAYesCO-FOUNDER,MANAGING MEMBER AND LIMITED PARTNER11/2016Schedule APDF page 190
3DIAMETER CAPITAL PARTNERS GP LLCGENERAL PARTNERDomestic entityDIAMETER CAPITAL PARTNERS LPLess than 5%Code NAYesGENERAL PARTNER11/2016Schedule APDF page 190
4MATTHEW GERARD GILMARTINCHIEF FINANCIAL OFFICER AND CHIEF OPERATING OFFICERIndividualDIAMETER CAPITAL PARTNERS LPLess than 5%Code NAYesCHIEF FINANCIAL OFFICER AND CHIEF OPERATING OFFICER07/2019Schedule APDF page 190
5SG DIAMETER LLCLIMITED PARTNERDomestic entityDIAMETER CAPITAL PARTNERS LP25% to less than 50%Code CYesLIMITED PARTNER07/2021Schedule APDF page 190
6DIAMETER MANAGEMENT INTERMEDIATE LPLIMITED PARTNERDomestic entityDIAMETER CAPITAL PARTNERS LP25% to less than 50%Code CYesLIMITED PARTNER07/2021Schedule APDF page 190
7MICHAEL JOSHUA COHNCHIEF COMPLIANCE OFFICER AND GENERAL COUNSELIndividualDIAMETER CAPITAL PARTNERS LPLess than 5%Code NAYesCHIEF COMPLIANCE OFFICER AND GENERAL COUNSEL08/2024Schedule APDF page 190
8APO INVESTMENT MANAGER AGGREGATOR VEHICLE, L.P.LIMITED PARTNERDomestic entityDIAMETER CAPITAL PARTNERS LP5% to less than 10%Code ANoLIMITED PARTNER07/2026Schedule APDF page 190
9SCOTT KREITLER GOODWINMEMBERIndividualDIAMETER CAPITAL PARTNERS GP LLC50% to less than 75%Code DYesMEMBER11/2016Schedule BPDF page 191
10JONATHAN NMN LEWINSOHNMEMBERIndividualDIAMETER CAPITAL PARTNERS GP LLC50% to less than 75%Code DYesMEMBER11/2016Schedule BPDF page 191
11SCOTT KREITLER GOODWINMEMBERIndividualSG DIAMETER LLC75% or moreCode EYesMEMBER07/2021Schedule BPDF page 191
12JONATHAN NMN LEWINSOHNLIMITED PARTNERIndividualDIAMETER MANAGEMENT INTERMEDIATE LP75% or moreCode EYesLIMITED PARTNER07/2021Schedule BPDF page 191

Less than 5% may include zero. Code F identifies a role without specifying a percentage. Reported interests may overlap and may not include every owner. Total indirect ownership is not calculated.

Compliance & Disclosures

Filing dated 8/27/2026 4:52:01 PM

Responses were selected by the RIA in its filing. Questions are shortened for readability; “you” refers to the reporting firm, and some questions also cover advisory affiliates.

RIA or supervised-person involvementThe RIA reported that none of the events below involve the firm or its supervised persons.RIA responseNo
AFelonies2 No

In the past ten years, have you or any advisory affiliate:

  • A1Been convicted of or pleaded guilty or no contest to a felony?No
  • A2Been charged with a felony?No
BMisdemeanors2 No

In the past ten years, have you or any advisory affiliate:

  • B1Been convicted of or pleaded guilty or no contest to a misdemeanor involving investments, an investment-related business, fraud, false statements or omissions, wrongful taking of property, bribery, perjury, forgery, counterfeiting, or extortion?No
  • B2Been charged with a misdemeanor of the kind listed above?No
CSEC or CFTC actions5 No

Has the SEC or CFTC ever:

  • C1Found you or an advisory affiliate made a false statement or omission?No
  • C2Found you or an advisory affiliate violated SEC or CFTC regulations or statutes?No
  • C3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • C4Entered an order against you or an advisory affiliate in connection with investment-related activity?No
  • C5Imposed a civil money penalty on you or an advisory affiliate, or ordered you or an advisory affiliate to cease and desist from any activity?No
DOther regulatory actions5 No

Has any other federal regulatory agency, state regulatory agency, or foreign financial regulatory authority ever:

  • D1Found you or an advisory affiliate made a false statement or omission, or was dishonest, unfair, or unethical?No
  • D2Found you or an advisory affiliate violated investment-related regulations or statutes?No
  • D3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • D4In the past ten years, entered an order against you or an advisory affiliate in connection with investment-related activity?No
  • D5Denied, suspended, or revoked your or an advisory affiliate’s registration or license, or otherwise prevented association with an investment-related business or restricted activities?No
ESelf-regulatory organization actions4 No

Has a self-regulatory organization or commodities exchange ever:

  • E1Found you or an advisory affiliate made a false statement or omission?No
  • E2Found you or an advisory affiliate violated its rules, other than a violation designated as a minor rule violation under an SEC-approved plan?No
  • E3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • E4Disciplined you or an advisory affiliate by expulsion, suspension, barring association with other members, or otherwise restricting activities?No
FProfessional authorizations1 No
  • FHas an authorization to act as an attorney, accountant, or federal contractor granted to you or an advisory affiliate ever been revoked or suspended?No
GPending regulatory proceedings1 No
  • GAre you or any advisory affiliate now the subject of a regulatory proceeding that could result in a “Yes” answer to any part of C, D, or E?No
HCivil judicial actions and proceedings4 No

(1) Court actions

Has a domestic or foreign court:

  • H(1)(a)In the past ten years, enjoined you or an advisory affiliate in connection with investment-related activity?No
  • H(1)(b)Found that you or an advisory affiliate violated investment-related statutes or regulations?No
  • H(1)(c)Dismissed, pursuant to a settlement agreement, an investment-related civil action brought against you or an advisory affiliate by a state or foreign financial regulatory authority?No

(2) Pending civil proceedings

  • H(2)Are you or any advisory affiliate now the subject of a civil proceeding that could result in a “Yes” answer to any part of H(1)?No

* Metrics are based on the latest available data, including Form ADV filings, brochures, and relationship summaries pulled from the SEC IAPD, and may be subject to change. Learn what is included in the Rialytix data. Please refer to the firm's official disclosures for the most accurate information using their CRD number. This is not investment advice.