Founded in 2003, Argonne Capital Group is a closely-held private investment firm that seeks to make equity investments in a diverse range of middle market enterprises.
Stated: EBITDA $5.0M to $150M · equity check up to $300M · Business services, Industrials, Consumer, Automotive and 2 more
Industries: Business services (stated) · Industrial services (stated) · Manufacturing (stated)
Middle market2024 PE fund GAV $1.6B22 PE funds of 22, latest vintage 202514 investment professionalslast event May 6, 2026
ethnic, educational
Stated: Energy, Infrastructure
Industries: Energy, utilities and infrastructure (1 company)
Middle market2024 PE fund GAV $2.3B16 PE funds of 18, latest vintage 20236 platforms8 investment professionalslast event Jul 24, 2026
Ascend PartnersNew York, NY · ascendpartners.com · SEC registered investment adviser
Buyout firm · probableStated: Healthcare, Infrastructure
Industries: Healthcare services (stated) · Life sciences (stated) · Energy, utilities and infrastructure (stated)
Middle market2024 PE fund GAV $2.2B17 PE funds of 18, latest vintage 20249 investment professionalslast event Sep 16, 2026
Hybrid manager · probable ••• Locked
Stated: Media and telecom, Consumer, Hospitality and leisure, Technology and 1 more
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
unsized2024 PE fund GAV not reported0 PE funds of 0investment professionals not trackedlast event Aug 14, 2025
••• Locked
Stated: Food and beverage, Environmental services, Agriculture, Energy and 1 more
Industries: Industrial services (stated) · Energy, utilities and infrastructure (stated) · Consumer products and retail (stated)
Lower middle market2024 PE fund GAV $230M2 PE funds of 2, latest vintage 202211 investment professionalslast event May 7, 2022
••• Locked
Stated: Real estate
Industries: Real estate (stated)
unsized2024 PE fund GAV $02 PE funds of 21 investment professionallast event Sep 1, 2026
••• Locked
Stated: EBITDA $4.0M to $25.0M · equity check $15.0M to $75.0M · Infrastructure, Transportation and logistics
Industries: Transportation and logistics (stated) · Energy, utilities and infrastructure (stated)
Middle market2024 PE fund GAV $1.6B7 PE funds of 7, latest vintage 20225 investment professionalslast event Mar 31, 2026
••• Locked
Stated: equity check $50.0M to $150M · Infrastructure
Industries: Energy, utilities and infrastructure (stated)
Lower middle market2024 PE fund GAV $337M3 PE funds of 3, latest vintage 20233 investment professionalslast event Sep 17, 2026
••• Locked
Stated: Real estate
Industries: Real estate (stated)
Middle market2024 PE fund GAV $1.3B2 PE funds of 2, latest vintage 2025investment professionals not trackedlast event Mar 31, 2026
••• Locked
Stated: Technology, Real estate
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Lower middle market2024 PE fund GAV $106M1 PE fund of 12 investment professionalslast event Sep 1, 2026
Private credit manager · probable ••• Locked
Stated: equity check $300M+ · Real estate, Industrials, Building products
Industries: Industrial services (stated) · Manufacturing (stated) · Real estate (stated)
Lower middle market2024 PE fund GAV $341M4 PE funds of 8, latest vintage 2025investment professionals not trackedlast event Sep 17, 2026
••• Locked
Stated: Transportation and logistics, Infrastructure, Industrials, Manufacturing and 3 more
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Lower middle market2024 PE fund GAV $540M3 PE funds of 314 investment professionalslast event Jun 9, 2025
Private credit manager · probable ••• Locked
Stated: Infrastructure, Real estate, Financial services, Building products and 1 more
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Upper middle market2024 PE fund GAV $352M4 PE funds of 13, latest vintage 20238 investment professionalslast event Apr 27, 2026
••• Locked
Stated: Financial services, Energy, Real estate
Industries: Financial services (stated) · Energy, utilities and infrastructure (stated) · Real estate (stated)
Upper middle market2024 PE fund GAV $6.5B16 PE funds of 16, latest vintage 2025investment professionals not trackedlast event Jul 13, 2026
••• Locked
Stated: Infrastructure, Real estate, Software, Consumer and 6 more
Industries: Software (2 companies) · Tech-enabled and IT services (1 company) · Hardware and deep tech (1 company)
Upper middle market2024 PE fund GAV not reported24 PE funds of 27, latest vintage 202216 investment professionalslast event Sep 1, 2026
Infrastructure · probable ••• Locked
Stated: Infrastructure, Industrials, Distribution, Transportation and logistics and 3 more
Industries: Industrial services (stated) · Manufacturing (stated) · Distribution (stated)
Upper middle market2024 PE fund GAV $7.0B31 PE funds of 31, latest vintage 20222 investment professionalslast event Mar 31, 2026
Venture firm with private equity activity · probable ••• Locked
Stated: Life sciences, Real estate, Technology
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Lower middle market2024 PE fund GAV $124M7 PE funds of 7, latest vintage 20252 investment professionalslast event Jun 30, 2026
••• Locked
Stated: equity check $25.0M to $150M · minority · Technology, Infrastructure
Industries: Transportation and logistics (1 company) · Software (stated) · Tech-enabled and IT services (stated)
Lower middle market2024 PE fund GAV $731M5 PE funds of 5, latest vintage 202411 investment professionalslast event Jul 13, 2026
Hybrid manager · probable ••• Locked
Stated: Real estate
Industries: Real estate (stated)
Lower middle market2024 PE fund GAV $963M5 PE funds of 9, latest vintage 202488 investment professionalslast event Sep 16, 2026
B••••••• • C••New York, NY · b•••••••••.com · SEC registered investment adviser
Buyout firm••• Locked
Stated: Financial services, Real estate
Industries: Financial services (stated) · Real estate (stated)
Middle market2024 PE fund GAV $1.7B90 PE funds of 90, latest vintage 2024investment professionals not trackedlast event Jul 1, 2026
B•• C••••••Atlanta, GA · b•••••••••.com · SEC registered investment adviser
Venture firm with private equity activity · probable••• Locked
Stated: Education, Infrastructure, Building products
Industries: Manufacturing (stated) · Energy, utilities and infrastructure (stated) · Education (stated)
Lower middle market2024 PE fund GAV $425M13 PE funds of 53, latest vintage 202621 investment professionalslast event Mar 25, 2026
••• Locked
Stated: Real estate
Industries: Manufacturing (2 companies) · Consumer products and retail (1 company) · Consumer services (1 company)
unsized2024 PE fund GAV not reported3 PE funds of 7, latest vintage 2024investment professionals not trackedlast event Sep 17, 2026
••• Locked
Stated: Real estate, Technology
Industries: Business services (10 companies) · Financial services (1 company) · Software (stated)
unsized2024 PE fund GAV not reported0 PE funds of 1, latest vintage 2022investment professionals not trackedlast event Sep 1, 2026
••• Locked
Stated: Energy, Agriculture, Real estate
Industries: Energy, utilities and infrastructure (stated) · Real estate (stated) · Agriculture (stated)
Large cap2024 PE fund GAV $45B125 PE funds of 129, latest vintage 20251 investment professionallast event Aug 12, 2026
Hybrid manager · probable ••• Locked
Stated: Technology, Media and telecom, Infrastructure
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
unsized2024 PE fund GAV not reported0 PE funds of 01 investment professionallast event Oct 30, 2025
Hybrid manager · probable ••• Locked
Stated: majority · Real estate
Industries: Real estate (stated)
unsized2024 PE fund GAV not reported0 PE funds of 0investment professionals not trackedlast event Feb 21, 2025
••• Locked
Stated: Energy, Healthcare, Financial services, Infrastructure and 2 more
Industries: Healthcare services (stated) · Life sciences (stated) · Financial services (stated)
Lower middle market2024 PE fund GAV $351M2 PE funds of 2, latest vintage 20218 investment professionalslast event May 11, 2018
••• Locked
Stated: Environmental services, Industrials, Infrastructure, Building products
Industries: Industrial services (stated) · Manufacturing (stated) · Energy, utilities and infrastructure (stated)
Lower middle market2024 PE fund GAV $501M7 PE funds of 7, latest vintage 20233 investment professionalslast event Mar 31, 2026
••• Locked
Stated: Energy, Infrastructure
Industries: Energy, utilities and infrastructure (1 company)
Lower middle market2024 PE fund GAV $802M6 PE funds of 6, latest vintage 20194 investment professionalslast event Mar 30, 2026
Venture firm with private equity activity · probable ••• Locked
Stated: Technology, Infrastructure, Aerospace and defense
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Lower middle market2024 PE fund GAV $286M7 PE funds of 11, latest vintage 20242 investment professionalslast event Mar 31, 2026
••• Locked
Stated: Financial services, Infrastructure
Industries: Financial services (4 companies) · Software (3 companies) · Tech-enabled and IT services (2 companies)
Lower middle market2024 PE fund GAV $342M10 PE funds of 10, latest vintage 202410 investment professionalslast event Aug 14, 2026
••• Locked
Stated: Healthcare, Business services, Industrial services, Industrials and 3 more
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Middle market2024 PE fund GAV $2.3B39 PE funds of 45, latest vintage 202549 investment professionalslast event Aug 28, 2026
B•• S••••• L••New York, NY · b•••••••••.com · SEC registered investment adviser
Buyout firm••• Locked
Stated: Real estate
Industries: Real estate (stated)
Lower middle market2024 PE fund GAV $762M10 PE funds of 16, latest vintage 20252 investment professionalslast event Mar 30, 2026
Stated: Infrastructure, Real estate
Industries: Energy, utilities and infrastructure (stated) · Real estate (stated)
Upper middle market2024 PE fund GAV $15B5 PE funds of 5, latest vintage 2018investment professionals not trackedlast event Jul 9, 2024
••• Locked
Stated: Financial services, Real estate
Industries: Financial services (stated) · Real estate (stated)
Lower middle market2024 PE fund GAV $73.8M1 PE fund of 1, latest vintage 202410 investment professionalslast event Mar 29, 2012
••• Locked
Stated: Energy, Transportation and logistics, Real estate
Industries: Transportation and logistics (stated) · Energy, utilities and infrastructure (stated) · Real estate (stated)
unsized2024 PE fund GAV not reported1 PE fund of 2, latest vintage 20143 investment professionalslast event Sep 1, 2026
••• Locked
Stated: Real estate, Infrastructure, Technology, Media and telecom
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Lower middle market2024 PE fund GAV $312M1 PE fund of 16 investment professionalslast event Aug 13, 2026
••• Locked
Stated: equity check $12.0M to $20.0M · Media and telecom, Real estate, Industrials, Distribution and 1 more
Industries: Industrial services (stated) · Manufacturing (stated) · Distribution (stated)
Lower middle market2024 PE fund GAV not reported4 PE funds of 4, latest vintage 20162 investment professionalslast event Sep 1, 2026
Private credit manager · probable ••• Locked
Stated: Real estate
Industries: Real estate (stated)
Lower middle market2024 PE fund GAV $339M1 PE fund of 2, latest vintage 202210 investment professionalslast event Sep 17, 2026
••• Locked
Stated: Life sciences, Infrastructure, Real estate, Environmental services
Industries: Life sciences (stated) · Industrial services (stated) · Energy, utilities and infrastructure (stated)
Lower middle market2024 PE fund GAV $13.8M24 PE funds of 24, latest vintage 2023138 investment professionalslast event Mar 30, 2012
••• Locked
Stated: control · Infrastructure, Manufacturing, Consumer, Energy
Industries: Manufacturing (stated) · Energy, utilities and infrastructure (stated) · Consumer products and retail (stated)
Lower middle market2024 PE fund GAV $42.0M9 PE funds of 9, latest vintage 20192 investment professionalslast event Mar 30, 2026
Hybrid manager · probable ••• Locked
Stated: Real estate
Industries: Real estate (stated)
unsized2024 PE fund GAV not reported0 PE funds of 04 investment professionalslast event May 2, 2025
Real estate private equity · probable ••• Locked
Stated: majority · Infrastructure, Real estate, Technology, Industrials and 4 more
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Middle market2024 PE fund GAV $1.5B4 PE funds of 4, latest vintage 20208 investment professionalslast event Aug 18, 2022
••• Locked
Stated: Industrials, Energy, Infrastructure
Industries: Industrial services (stated) · Manufacturing (stated) · Energy, utilities and infrastructure (stated)
Lower middle market2024 PE fund GAV $225M12 PE funds of 12, latest vintage 20234 investment professionalslast event Mar 17, 2026
••• Locked
Stated: Real estate
Industries: Industrial services (1 company) · Manufacturing (1 company) · Real estate (stated)
Lower middle market2024 PE fund GAV $301M2 PE funds of 2, latest vintage 20202 investment professionalslast event Jun 9, 2026
••• Locked
Stated: EBITDA $3.0M to $20.0M · revenue $10.0M+ · equity check $15.0M to $60.0M · Industrials, Infrastructure, Environmental services, Industrial services
Industries: Industrial services (stated) · Manufacturing (stated) · Energy, utilities and infrastructure (stated)
Lower middle market2024 PE fund GAV $493M8 PE funds of 9, latest vintage 20248 investment professionalslast event Apr 29, 2026
••• Locked
Stated: equity check $25.0M to $50.0M · Real estate
Industries: Real estate (stated)
Middle market2024 PE fund GAV $1.9B3 PE funds of 3, latest vintage 20241 investment professionallast event Aug 4, 2026
C•••••• C••••••Atlanta, GA · c•••••••••.com · SEC registered investment adviser
Hybrid manager · probable••• Locked
Stated: EBITDA $3.0M to $20.0M · revenue $10.0M to $50.0M · equity check $5.0M to $40.0M · Real estate
Industries: Real estate (stated)
unsized2024 PE fund GAV not reported2 PE funds of 2, latest vintage 20098 investment professionalslast event Feb 14, 2012
••• Locked
Stated: Real estate
Industries: Real estate (stated)
Lower middle market2024 PE fund GAV $2.4M1 PE fund of 1, latest vintage 2022investment professionals not trackedlast event Sep 1, 2026
Infrastructure · probable ••• Locked
Stated: Energy, Infrastructure, Technology, Transportation and logistics and 1 more
Industries: Software (stated) · Tech-enabled and IT services (stated) · Hardware and deep tech (stated)
Lower middle market2024 PE fund GAV $1.2M2 PE funds of 25 investment professionalslast event Jun 12, 2003