Family office-backed private investment firm
Declaration Partners
- HeadquartersNew York, NY S3
- Websitedeclarationpartners.com
- Last verifiedOctober 26, 2026
At a glance
| Assets under management | $1.9B (as of Jun 2026) S1 |
|---|---|
| Deal types | Platform, Add-on, Growth S2 |
| Sectors | Industrial & Manufacturing, Transportation & Logistics, IT Services & MSP, Software & SaaS, Consumer & Food |
What Declaration Partners buys
Declaration Partners is a New York investment firm whose largest investor is David Rubenstein. It began by investing on his behalf and now also manages money for other families and institutions, reporting about $1.9 billion of assets as of June 30, 2026 across private companies, real estate and newer investment firms. Its private investments team works in two ways: platform deals, where it backs a management team to buy and grow a company in a durable industry, and growth equity, which means minority stakes in fast-growing, mostly technology companies such as Ramp, Altruist and Paxos.
The platform deals named by the firm are all in industrials and services: CP Group, a San Diego maker of recycling sorting systems bought in August 2025, LMI, a technology and consulting contractor to federal agencies, Enstructure, a marine terminal operator, and New Frontier Materials, a St. Louis aggregates business sold to Martin Marietta in May 2026. Declaration publishes no revenue, EBITDA or check size limits. A smaller company is most likely to meet it as an add-on to one of these platforms.
Recent deals
Announced in the 24 months before October 26, 2026.
| Date | Company | Type | Sector | Source |
|---|---|---|---|---|
| May 2026 | New Frontier MaterialsSt. Louis aggregates and asphalt business bought by Martin Marietta, per Martin Marietta's quarterly filing | Exit | Source | |
| Apr 2026 | RecycleyeCP Group bought a majority stake in this London maker of AI vision systems for recycling plants | Add-on | Industrial & Manufacturing | Source |
| Aug 2025 | CP GroupMajority stake in a San Diego designer and builder of material recovery and sorting systems, with capital held back for growth and add-ons | Platform | Industrial & Manufacturing | Source |
| Dec 2024 | Mid-South Construction Materials (assets)Assets bought by Enstructure to grow its Greater Memphis footprint | Add-on | Transportation & Logistics | Source |
| Nov 2024 | Membrane FinancePaxos agreed to buy this Finnish e-money institution, subject to regulatory approval | Add-on | Source |
Portfolio by sector
From the firm's portfolio page S2.
Consumer
- StubHub
- SHEIN
- Essor
- CAVA
- Axiom Space
- Rothy's
- Epic Games
- ResortPass
- Ever/Body
Enterprise Software
- Rebellion
- Interos
- Dataminr
- Copado
Enterprise Software / Consumer
- Amperity
- Tealium
Fintech
- Paxos
- Sure
- Altruist
- WorkFusion
- TrueMotion (merged with Cambridge Mobile Telematics)
- Figment
- Ramp
- Solidus Labs
Fintech / Consumer
- Acorns
- Varo
- Immutable
Gaming
- aXiomatic Gaming
Government Services
- LMI
Healthcare
- ConcertAI
- Synthego
- MDClone
- PetDX
- Vault
- MedArrive
- Jasper
- Duos
Healthcare / Consumer
- Redesign Health
- Calibrate
Healthcare / Fintech
- Bright Health Group
Industrial Manufacturing and Services
- CP Group
Logistics
- Enstructure
PropTech
- Convene
- Cadre
Past investments: New Frontier Materials, Scopely
Greymont’s take
How Declaration Partners fits a seller
Declaration fits an owner of an industrial, logistics or government services business who is ready to sell a majority stake and wants a partner with family office roots rather than a traditional fund. The CP Group deal shows how that can look: Declaration bought a majority position, the CEO stayed to lead the company, the firm said it would keep and expand US manufacturing, and it set aside more capital for growth. Eight months later CP Group made its own add-on purchase.
Declaration does only a handful of platform deals, so most owners will meet it through one of its companies looking for add-ons. Two questions are worth asking early: how long it plans to hold the business, since it sold New Frontier Materials about five years after investing, and how the deal will be funded, since the firm invests for Rubenstein and other families and has not announced a dedicated private equity fund.
Questions owners ask
Does Declaration Partners buy controlling stakes in companies?
Yes, through its platform strategy. It bought a majority stake in CP Group in August 2025 and has backed management teams at LMI, Enstructure and New Frontier Materials. Most of its other holdings are minority growth stakes in technology companies.
Does Declaration Partners invest in waste or recycling businesses?
It owns CP Group, which designs, builds and installs sorting equipment for recycling and waste plants, and CP Group bought AI sorting company Recycleye in April 2026. It has not announced an investment in a hauling, disposal or recycling services company.
Will Declaration's companies buy smaller businesses?
Yes. Declaration said it sees CP Group as a platform for add-on acquisitions, and CP Group bought Recycleye in April 2026. Enstructure bought the assets of Mid-South Construction Materials in December 2024 to expand around Memphis.
Who is behind Declaration Partners?
David Rubenstein is its largest investor, and the firm was launched to invest on his behalf. It now also invests for other family offices and institutions and reported about $1.9 billion of assets as of June 30, 2026.
Sources
- S1Declaration Partners home page Accessed October 26, 2026
- S2Declaration Partners: Private Investments (strategy, portfolio and team) Accessed October 26, 2026
- S3Declaration Partners: Contact & Offices Accessed October 26, 2026
- S4Declaration Partners Invests in CP Group (August 8, 2025) Accessed October 26, 2026
- S5CP Group Acquires Recycleye (April 14, 2026) Accessed October 26, 2026
- S6Martin Marietta Materials Form 10-Q for the quarter ended June 30, 2026 (New Frontier Materials acquisition, Note B) Accessed October 26, 2026
- S7Declaration news: Enstructure acquires assets of Mid-South Construction Materials (December 5, 2024) Accessed October 26, 2026
- S8Paxos to Acquire Finnish E-Money Institution Membrane Finance (November 19, 2024) Accessed October 26, 2026
- S9Declaration raises approx. $303M for second real estate fund (October 23, 2025) Accessed October 26, 2026
- S10Declaration Partners: GP Solutions Accessed October 26, 2026
- S11LMI home page Accessed October 26, 2026
- S12Declaration Partners News Accessed October 26, 2026
Compiled by Greymont Advisors from public sources, including the firm’s own website and press releases. Greymont is not affiliated with Declaration Partners. Figures are as reported on the dates shown and may have changed. Request a correction