NEW YORK (TheStreet) -- Shares of AT&T (T - Get Report) are up over 3% on Tuesday thanks to upgrades from analysts at UBS and Barclays.

Both analysts went from hold to buy although the stock has done "absolutely nothing" of late, TheStreet's Jim Cramer, co-manager of the Action Alerts PLUS portfolio, said on CNBC's "Mad Dash" segment.

The upgrades have given shares a boost above $36, he said, pointing out AT&T's chart has been looking more bullish over the past few sessions. 

AMBA Chart
Ambarella AMBA data by YCharts

The analysts at Barclays are optimistic about AT&T's recent acquisition of DirecTV (DTV - Get Report), while Cramer pointed out the company's dividend coverage is improving. 

Turning to Ambarella (AMBA - Get Report), Cramer said the stock has become a battleground between bulls and bears. While shares have soared on the year, up over 100%, Citron Research's latest bearish note has added plenty of volatility. 

Shares are currently up over 8% but before then shares had plunged more than 20% in less than a week. 

It's important for investors to remember that Ambarella is more than just a supplier to GoPro (GPRO - Get Report), Cramer said. It has exposure to drones and security cameras, while also doing business with Comcast (CMCSA - Get Report) and Chinese smartphone maker Xiaomi

The "battle is on" between bulls and bears, he said, noting the stock has a 25% short interest. 

At the time of publication, Cramer's Action Alerts PLUS had no position in companies mentioned.