What happened Shares of Adobe Inc. (NASDAQ: ADBE) gained 29.1% in 2018, according to data from S&P Global Market Intelligence. The company's recurring revenue model helped power strong sales and earnings gains and drove shares to handily outperform the market last year. ^SPX data by YCharts Moving market-leading design software like Photoshop and Illustrator to a subscription-based distribution model has yielded great results for Adobe; growth in international markets and pushes into e-commerce and enterprise services are helping to drive strong performance and expand the company's ecosystem. Image source: Getty Images. So what Adobe shares climbed gradually across 2018 but retraced some gains following the company's fourth-quarter earnings release and guidance in mid-December. Management's earnings target fell short of analyst expectations, but the year-end sell-offs also occurred amid dramatic market declines and likely reflected an increasingly cautious mood among investors. Even with substantial sell-offs to close out the year, Adobe shareholders still had plenty to be happy about with the company's 2018 performance. Adobe's transition from one-time sales to a software-as-a-service model has been hugely successful, and its acquisition of cloud marketing software firm Marketo and e-commerce platform Magento could help power its next growth stages. Adobe continued to record strong sales growth across 2018; it has now reported comparable sales growth for 15 quarters straight and sales growth of at least 20% for 14 consecutive quarters. Now what For fiscal 2019, Adobe expects adjusted earnings per share of $7.75 on sales of $11.15 billion. Shares trade at roughly 30 times the year's expected earnings and 10 times expected sales. That's a growth-dependent valuation that will require that the company continue to execute at a high level. However, the business is showing undeniable momentum, and Adobe's leading position in design software, combined with its heightened push into marketing, enterprise services, and e-commerce, gives the business paths to exceeding expectations. 10 stocks we like better than Adobe SystemsWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has quadrupled the market.* David and Tom just revealed what they believe are the 10 best stocks for investors to buy right now... and Adobe Systems wasn't one of them! That's right -- they think these 10 stocks are even better buys. Click here to learn about these picks! *Stock Advisor returns as of November 14, 2018Keith Noonan has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Adobe Systems. The Motley Fool has a disclosure policy.