Check out today's top analyst calls from around Wall Street, compiled by The Fly.

AD BUSINESS SPEEDY RECOVERY: Stifel analyst Scott Devitt upgraded Alphabet (GOOGL) to Buy from Hold with a price target of $2,350, up from $2,025. The analyst cited the "resilience" and "speedy recovery" of the company's digital advertising businesses, which has been "impressive" during the pandemic. Devitt also noted that the bounce in advertising dollar flows followed increased online consumer engagement. Further, the analyst is increasingly confident that Alphabet stands to benefit from category recovery in travel entertainment and media, while continuing to capture market share as an "internet gatekeeper."

BUY ROKU: Truist analyst Matthew Thornton upgraded Roku (ROKU) to Buy from Hold with a lower price target of $367, down from $480. The valuation on the stock has become "more tenable" with upside potential to the Platform's gross profit, the analyst told investors in a research note. Roku's catalysts could include TCL Roku TVs in U.K. and Brazil as well as progress with linear addressable TV, which he expects to grow by over 20% per year over the next 5 years and over 15% CAGR over the next 10 years.

OUTPERFORMANCE POTENTIAL: Jefferies analyst Sheila Kahyaoglu upgraded American Airlines (AAL) to Hold from Underperform with a price target of $25, up from $15. American's strong network positioning as the sole operator on 37% of its routes gives it "considerable potential" to outperform peers through the recovery, Kahyaoglu told investors in a research note. American also has a younger fleet at an average age of 10.8 years, versus peers at about 15 years, which is important in a rising fuel cost environment, Kahyaoglu added. However, the analyst believes the offset to its fleet and network advantages is the airline's leverage, which restricts the company's near-term flexibility and the stock's valuation.

MOVING TO THE SIDELINES: Credit Suisse analyst Douglas Mitchelson upgraded ViacomCBS (VIAC) to Neutral from Underperform with a $46 price target. The analyst noted that following last week's decline, the stock now trades in line with his price target. While he expected fundamentals-based investors to "steer clear" from the stock until the current levels, Mitchelson now sees the first half of the year for ViacomCBS as "positively biased" on the catalyst front, and also believes that the current year estimates are "reasonable" if not "conservative."

ROOM FOR MULTIPLE EXPANSION, EBITDA REVISIONS: Gordon Haskett analyst Robert Mollins initiated coverage of Expedia (EXPE) with a Buy rating and $211 price target, representing 20% share price upside. The analyst sees room for both multiple expansion and upward EBITDA revisions for Expedia due to pent-up travel demand along with its a higher-margin business post COVID. Expedia's dual accommodation platforms appeal to consumers seeking an array of accommodation types, which eliminates the need for consumers to search elsewhere, Mollins told investors in a research note.

The analyst also started coverage of Booking Holdings (BKNG) with a Hold rating and $2,574 price target. Given increased restrictions and rising case counts in Europe, he sees near-term multiple expansion for the stock being "hard fought."