| # | Company | Employees |
|---|---|---|
| 1 | 38,917 | |
| 2 |
GXO Logistics, Inc.gxo.com
Providing innovative opportunities in logistics through advanced automation, benefiting customers, employees, and investors alike |
36,174 |
| 3 |
Interactive Brokersinteractivebrokers.com
Provides automated trade execution and custody for diverse financial instruments across global markets, offering advanced tools and research at low cost. |
3,506 |
| 4 |
W. R. Berkley Corporationberkley.com
Holding company for insurance and reinsurance businesses, specializing in niche markets globally with property casualty coverage in the United States. |
2,624 |
| 5 |
Zinniazinnia.com
The company simplifies life and annuity processes through technology, empowering clients to innovate, launch products faster, and better serve customers |
2,494 |
| 6 |
Not Availablefifthstreetfinance.com
A credit-focused asset manager providing innovative financing solutions to small and mid-sized businesses through various investment vehicles and co-investment capabilities |
2,277 |
| 7 |
Clipper Logistics plcgxo.com
Specializes in contract logistics services as part of the world's largest pure-play contract logistics company, GXO. |
1,472 |
| 8 |
Greenwich Hospitalgreenwichhospital.org
A progressive regional hospital in Connecticut and New York, affiliated with Yale University School of Medicine, offering advanced care and career opportunities |
1,458 |
| 9 |
Cedar Gate Technologiescedargate.com
A technology and services platform empowering healthcare organizations to excel at value-based care, with actionable analytics and solutions improving care delivery |
1,191 |
| 10 |
AQR Capital Managementaqr.com
Global investment management firm combining economics, behavioral finance, data, and technology to optimize client portfolio performance worldwide. |
957 |
| 11 |
Blue Sky Studiosdisney.com
An award-winning feature-animation studio known for producing diverse and relatable CG animated films, including Ice Age, Rio, and Ferdinand Next releases: Spies in Disguise and Nimona |
771 |
| 12 |
Greenwich Public Schoolsgreenwichschools.org
Operates public schools from kindergarten through high school, including neighborhood, magnet, and alternative programs, plus a tuition-based preschool for residents and employees. |
525 |
| 13 |
Silver Point Capital, L.P.silverpointcapital.com
Leading global credit investing firm with a dedicated team, overseeing billions in assets across direct lending, liquid performing credit, and special situations investment strategies. |
441 |
| 14 |
The Town of Greenwich, CTgreenwichct.gov
A premier residential community on Long Island Sound, offering 8,000 acres of protected land, top schools, cultural events, and thriving industries |
435 |
| 15 |
L Cattertonlcatterton.com
investment firm managing equity capital across private equity, credit, and real estate, partnering with consumer brand management teams |
429 |
| 16 |
Greenwich Country Day Schoolgcds.net
Co-ed independent school in Greenwich, CT prepares Nursery through Grade 12 students for college and beyond as ethical, confident leaders |
357 |
| 17 |
Brunswick Schoolbrunswickschool.org
A college-preparatory day school for boys offering education from Pre-K to grade 12, focusing on academic rigor, character development, and self-discipline |
349 |
| 18 |
Sacred Heart Greenwichshgreenwich.org
Empowering all-girls' Catholic school in Connecticut offering a rigorous academic program and global educational opportunities to develop confident, intelligent, and compassionate leaders |
326 |
| 19 |
Gifted Handsgiftedhandsshop.com
Gifted Hands is a boutique in Greenwich, CT featuring local designers and artisans offering unique clothing, jewelry, accessories, and gifts |
317 |
| 20 |
XFLtheufl.com
The company merged with the USFL to create the United Football League, delivering fan-first, innovative professional football experiences beginning in 2024 |
303 |
| 21 |
Marc Fisher Footwearmarcfisherfootwearcorp.com
A leading fashion footwear designer and marketer with over 100 years of experience, known for high-quality products sold worldwide |
294 |
| 22 |
WINwinfertility.com
The company provides comprehensive family-building and well-being solutions, including fertility support, surrogacy, adoption, menopause support, parenting resources, and more |
292 |
| 23 |
Strategic Value Partnerssvpglobal.com
global alternative investment firm specializing in special situations, private equity, opportunistic credit, and financing opportunities with operational expertise |
274 |
| 24 |
Stone Point Capitalstonepoint.com
Investment firm in Greenwich, CT with $45B assets under management targeting financial services industry investments through private equity, credit funds, and financing solutions |
254 |
| 25 | 225 | |
| 26 |
XPO Logistics (5)xpo.com
A global provider of transportation and logistics services including truckload brokerage, last mile logistics, supply chain solutions, warehousing, and global forwarding |
191 |
| 27 |
Silver Point Capitalsilverpointcapital.com
Distressed debt and credit-focused private investment firm in Greenwich, CT, investing in complex situations requiring deep analysis and expertise |
189 |
| 28 |
Berkley Re (a Berkley Company)berkleyre.com
Global reinsurance provider offering treaty and facultative reinsurance solutions to insurance companies and self-insured businesses worldwide through local experts in key regions |
183 |
| 29 |
Greenwich High Schoolghs.greenwichschools.org
A collaborative community of learners focused on academic excellence, integrity, and responsibility at a Primary/Secondary school in Greenwich, Connecticut |
180 |
| 30 |
LNR Property LLCstarwoodpropertytrust.com
A pioneering commercial real estate company with expertise in CMBS investments, asset management, direct equity investing, and real estate development |
178 |
| 31 |
Orthopaedic and Neurosurgery Specialistsonsmd.com
Specializing in orthopedics, neurosurgery, sports medicine, and rehabilitation, the company provides comprehensive patient-centered care with sub-specialty trained physicians in multiple locations |
168 |
| 32 |
The Richman Grouptherichmangroup.com
A major player in the residential property sector, with a nationwide presence and extensive portfolio spanning 49 states and several territories |
167 |
| 33 |
Atlas Holdings LLCatlasholdingsllc.com
A diversified group of manufacturing, distribution, service, and trading businesses under the Atlas Holdings umbrella |
166 |
| 34 |
Delamar Hotel Collectiondelamar.com
A collection of elegant hotels offering elevated experiences through art, history, spa services, fine dining, and unique event spaces |
160 |
| 35 |
Capital Logistics, LLCinternational.capitallogisticsllc.com
Global third-party logistics provider specializing in temperature controlled freight, offering domestic and international freight forwarding and customs brokerage services. |
89 |
| 36 |
Edgewood Management LLCedgewood.com
Management of large cap growth portfolios focusing on high-quality companies with strong earnings, balance sheets, and long-term investment horizons. |
80 |
| 37 |
Paloma Partners Management Companypaloma.com
A multi-strategy investment adviser focusing on generating long-term, low correlated returns by partnering with innovative investment talent globally |
77 |
| 38 |
Weeden & Co.pipersandler.com
A trusted institutional trading firm since 1922, offering premier execution services with a focus on client relationships, senior management involvement, and a partnership-based culture |
75 |
| 39 |
Kline Hill Partnersklinehill.com
Private equity secondary market investor acquiring limited partnership interests in buyout and venture funds, as well as direct company interests on a secondary basis |
72 |
| 40 |
Axiom Investorsaxiominvestors.com
Employee-owned investment management firm with a dynamic growth approach based in Greenwich, CT, specializing in global, international, and emerging market equity portfolios |
67 |
| 41 |
Leverage Shares EUleverageshares.com
A European leader in leveraged and inverse exchange traded products, offering magnified exposure for experienced traders through physical replication Capital at risk |
53 |
| 42 |
Greenbriar Equity Groupgreenbriarequity.com
Specializing in private equity investments, this firm has over 20 years of experience collaborating with middle market businesses in specific sectors |
51 |
| 43 |
Chatsworth Securities LLCchatsworthgroup.com
Investment banking firm specializing in advisory services, private capital raising, M&A, IPOs, and equity offerings across high-growth industries. |
48 |
| 44 |
Spencer Trask & Co.spencertraskco.com
An advanced technology development firm that discovers innovative ideas and helps entrepreneurs build world-changing ventures in various industries |
41 |
| 45 |
INDATAindataipm.com
Provider of software, technology, and services for buy-side firms, offering trade order management, compliance, portfolio accounting, and front-to-back office solutions for institutional investors worldwide |
38 |
| 46 |
Southfield Capitalsouthfieldcapital.com
Private equity firm investing in growing North American companies in the lower middle market with $4-15 million EBITDA, strong leadership, and attractive growth and profitability trends |
38 |
| 47 |
Glade Brook Capital Partners LLCgladebrookcapital.com
Global investment firm specializing in internet and software sectors, providing growth equity and private credit to tech companies from growth stage to IPO |
31 |
| 48 |
ParaFi Capitalparafi.com
Alternative asset management firm specializing in hedge fund and venture capital strategies within the digital asset ecosystem Trusted by global institutions since 2018 |
30 |
| 49 |
Sterling Investment Partnerssterlinglp.com
Middle market private equity firm investing in companies with strong growth potential, supporting management teams in accelerating growth and building operational capabilities in targeted sectors |
30 |
| 50 |
Sageview Capitalsageviewcapital.com
Private investment firm partnering with innovative software and tech businesses, leveraging experience and networks to scale companies successfully. |
29 |
| 51 |
Starwood Energy Groupstarwoodenergygroup.com
Energy infrastructure investment firm specializing in natural gas and renewable power generation, transmission assets, managing over $2 billion in equity commitments |
27 |
| 52 |
Activant Capitalactivantcapital.com
Global investment firm partnering with high-growth companies transforming commerce worldwide |
26 |
| 53 |
CenterBook Partners LPcenterbook.com
A multinational firm specializing in alternative investments on a global scale |
25 |
| 54 |
RCB FUND SERVICES LLCrcbfundservices.com
Financial services company headquartered in Greenwich, Connecticut, offering a range of services in the financial industry |
24 |
| 55 | 24 | |
| 56 |
Plainfield Asset Managementpfam.com
An investment management firm based in Connecticut, managing capital for institutions and high net worth individuals in the US and abroad |
24 |
| 57 |
Gallatin Point Capital LLCgallatinpoint.com
A private investment firm specializing in making opportunistic investments in financial institutions, services, and assets to generate attractive risk-adjusted returns |
23 |
| 58 |
The Silverfern Groupsilfern.com
Global middle-market investment management firm making direct investments globally in Americas and Asia-Pacific with a strong network for non-correlated opportunities Visit website for more information |
21 |
| 59 |
Forward Consumer Partnersforwardconsumerpartners.com
Private equity firm investing in growing consumer brands, providing resources and collaboration to help brands reach their potential |
21 |
| 60 |
Manfredi Jewelsmanfredijewels.com
Luxury fine jewelry and timepiece retailer offering an unparalleled collection of exquisite jewels, over 30 brands of watches, and exclusive jewelry creations |
20 |
| 61 |
Decisive Pointdecisivepoint.com
Venture capital firm investing in deep-tech innovations across security, health, energy, and infrastructure, supporting those solving tomorrow's challenges with strategic capital and expertise |
20 |
| 62 |
ECP Growthecpgrowth.com
A private investment firm in Connecticut and Europe, focusing on high-potential consumer products and services companies for strategic investment alliances and sustainable value creation |
20 |
| 63 |
Prostar Capitalprostarcapital.com
Private investment firm specializing in midstream infrastructure assets within the energy supply chain, strategically located to meet global energy demand |
19 |
| 64 |
Alinda Capital Partners LLCastatineip.com
Infrastructure investment firm managing over $7 billion in funds, focusing on stable, long-term assets in North America and Europe, with experienced team and global presence |
19 |
| 65 |
QFS Asset Management, L.P.qfsfunds.com
A leading asset and risk management firm providing superior non-correlated returns across major asset classes, with expertise in customized solutions |
16 |
| 66 |
Good Hill Partners LPgoodhillpartners.com
Private investment firm specializing in structured products and fixed income markets, managing capital for clients with diverse return and liquidity profiles Committed to transparency and fiduciary standards |
15 |
| 67 |
qTechnology
A tech startup that utilizes AI, machine learning, and optimization through cloud and decentralized technology to develop proprietary platforms and products |
15 |
| 68 |
10T Holdings10tfund.com
Investing in growth stage private companies in the digital asset ecosystem, focusing on blue-chip companies that will shape the future |
14 |
| 69 |
Cardinal Capital Management, L.L.C.cardcap.com
An established investment firm specializing in small and mid-cap value equity investing, focused on producing high-quality results using a free cash flow driven strategy |
13 |
| 70 |
Access Anvil Corp.accessinstalll.com
A provider of superior fence, gate, and gate operator installations in the Northeast US, offering hard-to-find products and 24-hour maintenance contracts since 1975 |
11 |
| 71 |
Gaia Restaurant
A restaurant located in Greenwich, CT, Gaia offers a dining experience with a focus on quality food and exceptional service |
11 |
| 72 |
Endeavour Capital Advisors Inc.endcap.com
Boutique asset management firm in Greenwich, CT investing in financial services sector through public and private equities |
11 |
| 73 |
Whitehaven Asset Management, LPwhitehavenlp.com
This company offers municipal investment advisory and portfolio management services to its clients |
10 |
| 74 |
Deccan Value Investors L.P.deccanvalue.com
This company offers investment management and advisory services to top endowments, foundations, and family offices worldwide |
8 |
| 75 |
BLKBRD Asset Management, LPblkbrdlp.com
Specializing in systematic investment strategies, our company enhances alpha through quantitative research and advanced technology, striving for optimized risk-adjusted returns |
8 |
| 76 |
Berkley Aviation (a Berkley Company)berkley.com
The company offers a variety of insurance and reinsurance products through its operating units Visit the website for more information |
6 |
| 77 |
Engle Capital Management, LPenglecap.com
A New York-based investment firm focusing on long and short positions in global equities through fundamental research to generate high returns and preserve capital |
6 |
| 78 |
Victoria Capital Investmentsvictoriacapinvestments.com
An asset investment group specializing in venture capital investing, small business creation/management, aiming to incite opportunity through connection and communication |
6 |
| 79 |
Phoenix Intelligencephoenix-intel.com
This company offers energy procurement, weather consulting, budget analysis, utility audits, group energy buying, and green energy purchases for businesses |
5 |
| 80 |
Vollert Capitalvollertcapital.com
A premier investment management firm providing customized solutions with experienced professionals focusing on research, analysis, and risk management strategies |
5 |
| 81 |
R3 Venture Partnersr3vp.com
Early-stage venture capital fund investing in post-Seed to Series A rounds, with active involvement in management of targeted companies |
4 |
| 82 |
Titanite Investment Management LPtitanitecapital.com
Investment firm targeting transformative biotech and medtech advancements, focusing on small and midcap US equity investments |
4 |
| 83 |
Alius Groupalius-group.com
Global financial services provider offering management, technology, and implementation services to solve complex challenges with innovative technology and regulatory expertise |
3 |
| 84 |
Citrine Power, LLCcitrinepower.com
A renewable energy developer and investor specializing in solar and battery solutions for commercial and public properties, committed to sustainability and community partnerships |
2 |
| 85 |
One Three One Partners
An investment firm focusing on generating risk-adjusted returns by investing in technology and consumer sectors through operational growth and prudent capital allocation |
1 |
| 86 |
Phillimore Investments LPphillimore.com
Global macro asset management firm headquartered in Greenwich, Connecticut with a focus on investment strategies for clients worldwide |
1 |
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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.
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