Go all in.

The majority of the time analysts reiterate their stock recommendations. So when a stock is upgraded, or more rarely, downgraded, the market takes note.

Here we used TipRank's Daily Analyst Recommendations tool to find the most compelling stock ratings so far this week. TipRanks scans the web for ratings from over 4,800 Wall Street analysts and then ranks these analysts based on their success rate and average return. The result: we can find the latest upgrades from the best analysts on Wall Street.

Let's take a closer look at these three bullish stock moves now.

Marvell

Semiconductor solutions stock Marvell (MRVL) - Get Report is buzzing following a key Deutsche Bank upgrade. The firm's five-star analyst, Ross Seymore, upgraded Marvell on June 27. His rating comes with a $24 price target (19% upside potential). He considers Marvell one of the few semis with potential upside in both valuation and earnings.

Seymore cites two key reasons for his shift in sentiment: the stock's recent weakness, and Marvell's Cavium deal. Marvell snapped up rival network processor maker Cavium for $6 billion. The deal, which has just received approval from Chinese regulators, should close in July. For Seymore, this is a positive short-term catalyst that will drive long-term strength. Over the long-term, management believes total synergies from the Cavium deal could amount to $200 million.

This upgrade comes on the back of Evercore ISI initiating coverage of Marvell. Analyst CJ Muse started his Marvell coverage with a bullish buy rating and $27 price target (34% upside potential). "From a purely fundamental perspective, Cavium and Marvell's product portfolios are especially complementary for the data center, with virtually no product overlap," stated the analyst.

And taking a step back to the bigger picture, the situation looks even more promising. "We see the emergence of the third wave of compute led by AI/big data/storage making data worth a lot more today, creating a virtuous cycle generating ever increasing demand for higher semiconductor content led by the data center/cloud - with Marvell a direct beneficiary of these trends," Muse wrote.

Overall, our data shows that 'Strong Buy' stock Marvell has 100% Street support right now. This means that in the last three months 12 analysts have published Marvell buy ratings. Meanwhile, the average analyst price target of $28 indicates 32% upside potential.

Twilio

Cloud communications pioneer Twilio Inc. (TWLO) - Get Report wants to 'fuel the future of communications'. Using its platform, developers can build SMS, voice and messaging applications on an API built for global scale. This places the company in prime position to benefit from an increasingly interactive consumer-business relationship.

And now top Argus analyst Jim Kelleher has spied a favorable entry point following the broader tech pullback. He upgraded the stock on June 28 with a $75 price target (38% upside potential). "As a facilitator of apps that companies can embed in their sites to improve customer interaction, we believe Twilio is in the very early innings of a significant market opportunity," Kelleher explains. 

The analyst adds, "We also expect the company to become increasingly attractive to investors once Twilio achieves and sustains non-GAAP profitability, which we expect to occur within the next 12 months." He believes this next stage of growth will be driven by the company's "go to market" efforts, boosted by the newly-launched Build platform.

Overall our data shows that this 'Strong Buy' stock has received 10 recent buy ratings versus only one hold rating. This is with an average analyst price target of $59.

Yum! Brands

Yum! Brands (YUM) - Get Report owns some of the world's most popular fast food chains in KFC, Pizza Hut, and Taco Bell. The stock received a big boost recently following a very positive move from a top Street analyst.

"We are upgrading shares of Yum! Brands ... given the stock's recent weakness, favorable risk/reward outlook and expected benefits from its recent investment in GrubHub," BTIG's Peter Saleh told investors on June 27. His $92 price target translates into 16.5% upside potential from the current share price.

"We believe Yum!'s investment will give the company a competitive advantage over many of its peers by providing more insight and customer-level data than that available to other restaurants." The company can leverage these valuable insights when making brand decisions, giving it a significant advantage against companies who don't have access to such a rich data pool.

Yum! Brands announced its partnership and $200 million investment in food delivery business GrubHub (GRUB) - Get Report back in February. Its 3% Grubhub stake makes it one of the first fast-food companies to directly invest in a food-delivery business, and is part of the company's strategy of increasing customer access to its food chains.

The stock currently holds a cautiously optimistic 'Moderate Buy' analyst consensus rating. In the last three months, six analysts have published buy ratings and three hold ratings on the stock. Meanwhile, their average analyst price target of $90 equals 14% upside from the current share price.

Here's what Wendy's (WEN) - Get Report CEO Todd Penegor just told TheStreet's Executive Editor Brian Sozzi. 

TipRanks offers investors the latest insight into eight different sectors by tracking the activity of 4,500 analysts, 5,000 financial bloggers and even 37,000 corporate insiders. As of this writing, Harriet Lefton did not hold a position in any of the aforementioned securities.