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Dune Acquisition Corporation does not have significant operations. It focuses on effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, or similar business combination with one or more businesses. It intends to focus on opportunities in the technology sector, primarily companies operating in a Software as a Service model. The company was incorporated in 2020 and is based in West Palm Beach, Florida. Dune Acquisition Corporation operates as a subsidiary of Dune Acquisition Holdings LLC.

Greenhill & Co., Inc., an independent investment bank, provides financial and strategic advisory services to corporations, partnerships, institutional investors, and governments worldwide. The company offers advisory services related to mergers and acquisitions, divestitures, restructurings, financings, private capital raising, and other similar transactions. It also advises clients on strategic matters, including activist shareholder defense, special committee projects, licensing deals, and joint ventures; and valuation, negotiation tactics, industry dynamics, structuring alternatives, and timing and pricing of transactions, as well as financing alternatives. In addition, the company provides restructuring advisory services to debtors, creditors, governments, and other stakeholders, and acquirers of distressed companies and assets; and advice on valuation, debt capacity, liability management, restructuring and financing alternatives, capital structures, and M&A in both in-court and out-of-court processes. Further, it advises on private placements of debt and structured equity, refinancing of existing debt facilities, negotiating the modification, and amendment of covenants, as well as acts as an independent advisor. Additionally, the company offers financial advisory services to pension funds, endowments, and other institutional investors on transactions involving alternative assets; and advice to alternative asset fund sponsors for private capital raising, financing, restructuring, liquidity options, valuation, and related services. The company was founded in 1996 and is headquartered in New York, New York.

Oppenheimer Holdings Inc. operates as a middle-market investment bank and full-service broker-dealer in the Americas, Europe, the Middle East, and Asia. The company provides brokerage services covering corporate equity and debt securities, money market instruments, exchange-traded options and futures contracts, municipal bonds, mutual funds, exchange-traded funds, and unit investment trusts; financial and wealth planning services; and margin lending services. It offers asset management services, including separately managed accounts, mutual fund managed accounts, discretionary portfolio management programs, non-discretionary investment advisory and consultation services, alternative investments, portfolio enhancement programs, and institutional taxable fixed income portfolio management strategies and solutions, as well as taxable and non-taxable fixed income portfolios and strategies. In addition, the company offers investment banking services, such as strategic advisory services and capital markets products; merger and acquisition, equities capital market, debt capital market, debt advisory and restructuring, and fund placement services; and institutional equity sales and trading, equity research, equity derivatives and index options, convertible bonds, event driven sales and trading, and portfolio and electronic trading. Further, it provides institutional fixed income sales and trading, fixed income research, public finance, and municipal trading services; and proprietary trading and investment activities. Additionally, the company offers underwriting, market-making, trust, and discount services, as well as a cloud-based financial market. It serves high-net-worth individuals and families, corporate executives, public and private businesses, institutions and corporations, governments, financial sponsors, and domestic and international investors. Oppenheimer Holdings Inc. was founded in 1881 and is headquartered in New York, New York.

Siebert Financial Corp., through its subsidiaries, engages in the retail discount brokerage and investment advisory businesses in the United States and Internationally. It offers discount brokerage services, including self-directed trading, wealth management, financial advice, market making and fixed income investment, stock borrow, equity compensation plans, securities lending, equity stock plan, and market making services; independent retail execution services; and retail customer services. The company also offers self-directed retirement accounts, as well as lends customers a portion of the market value of marginable securities held in the customer's account. In addition, the company provides data technology platform that offers various services, such as email and messaging, market data systems and third party trading systems, business productivity tools, and customer relationship management systems. Further, it offers a Robo-Advisor platform that provides clients with an automated wealth management solution; and various insurance products, such as fixed annuities, personal insurance, property and casualty insurance, natural disaster insurance, and life and disability. The company has 12 branch offices in the United States. Siebert Financial Corp. was incorporated in 1934 and is headquartered in Miami Beach, Florida. Siebert Financial Corp. was formerly a subsidiary of Kennedy Cabot Acquisition, LLC.