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PROS Holdings, Inc. provides software solutions that optimize the processes of selling and shopping in the digital economy in Europe, the Asia Pacific, the Middle East, Africa, and internationally. The company offers PROS Smart Configure Price Quote that improves sales productivity and accelerate deal velocity by automating common sales tasks; and PROS Smart Price Optimization and Management, which enables businesses to optimize, personalize, and harmonize pricing. It also provides PROS Airline Revenue Optimization; PROS Airline Revenue Management solution that delivers algorithmic forecasting and network optimization for the travel industry; PROS Airline Real-Time Dynamic Pricing, which offers accurate booking class availability and seat prices; PROS Dynamic Ancillary Pricing, an AI-based reinforcement learning algorithm; PROS Airline Group Sales Optimizer that enables airlines and their travel agent partners to create and manage group bookings, contracts, policies, and payments; and PROS Corporate Sales, a solution that enables airlines to create commercial agreements with corporate customers. In addition, the company provides PROS Digital Retail, a configurable end-to-end solution for airlines to optimize the traveler experience from inspiration to post-trip; PROS Dynamic Offers; and PROS Digital Offer Marketing solutions comprising airTRFX, airModules, airWire, and airSEM platforms. Further, it provides software-related services, such as implementation, configuration, consulting, training, maintenance, and support services. The company markets and sells its solutions to customers in various industries, including automotive and industrial manufacturing, transportation and logistics, chemicals and energy, food and consumables, beverages, healthcare, insurance, technology, and travel through its direct sales force, partners, resellers, and systems integrators. PROS Holdings, Inc. was incorporated in 1985 and is headquartered in Houston, Texas.

Vanguard Dividend Appreciation ETF (the Fund) seeks to track the investment performance of the Dividend Achievers Select Index. Vanguard Dividend Appreciation ETF is an exchange-traded share class of Vanguard Dividend Appreciation Index Fund. The Fund will hold all the stocks in the index in approximately the same proportions as their weightings in the index. The Vanguard Group, Inc., through its Quantitative Equity Group, serves as the investment advisor of the Fund.