Public Storage ( PSA) shares rose 8% a day after it reported a rise in operating income in the fourth quarter. Shares were up 5.8% to $55.48 as the Glendale-Calif.-based self-storage provider reported net operating income rose $11.8 million, led by a $6.5 million increase in same-store operations. Digital Realty Trust ( DLR) shares rose 4% to $29.89 after the real estate investment trust reported a 43% rise in funds from operations. Digital had FFO of $68.9 million, or 76 cents per share, compared with $38.9 million, or 53 cents per share, a year earlier. Extra Space Storage ( EXR) shares rose 1.5% to $6.27 a day after Citigroup initiated coverage on the Salt Like City company with a hold rating. Sovran Self Storage ( SSS) shares lifted after the company, which operates outlets under the name Uncle Bob's Self Storage, filed a 10-K with the SEC citing its improved performance. Shares were up 0.8% to $21.18. The Buffalo, N.Y., company cited the Uncle Bob's truck move-in program, "under which, at present, 259 of our stores offer a free Uncle Bob's truck to assist our customers in moving into their spaces, and an increase in internet marketing and sales." "In addition to increasing revenue, we have worked to improve services and amenities at our stores. While this has caused operating expenses to increase over the past five years, it has resulted in a superior storage experience for our customers. "Our managers are better qualified and receive a significantly higher level of training than they did five years ago, customer access and security are greatly enhanced as a result of advances in technology, and property appearance and functionality have been improved."