The major indexes ended mixed on a day filled with positive auto sales numbers and Berkshire Hathaway’s biggest deal ever. The Dow closed down 0.2% while the S&P 500 gained 0.2% and the Nasdaq added 0.4%.

Here are Tuesday’s winners and losers:

Winners

Black & Decker Corp. (BDK)
The tool manufacturer gained 31% a day after the announcement that it would be acquired by Stanley Works. BDK shares closed at $62.00, up $14.66 on the day.

Burlington Northern Santa Fe Corp. (BNI)
News that Warren Buffett’s Berkshire Hathaway is buying the railroad for $44 billion helped the stock gain 27.5%. BNI shares ended the session at $97.00, a gain of $20.93 on the day.

American International Group Inc. (AIG)
The insurer saw its stock climb 14.3% Tuesday, with shares gaining $4.91 to end the day at $39.22.

Stanley Works (SWK)
Monday’s action with Black & Decker helped the tool manufacturer add 10.1%. SWK shares last traded at $46.69, a gain of 4.54 on the day.

Cognizant Technology Solutions Corp. (CTSH)
Quarterly results beat the Street’s estimates, sending the IT technology provider up 8.2% Tuesday. CTSH shares closed at $41.97, up $3.17 on the day.

Losers

Novellus Systems Inc. (NVLS)
A downgrade by Morgan Stanley dropped the semiconductor developer’s stock by 5.2%. NVLS shares last traded closed at $19.71, down $1.07 on the day.

Vulcan Materials Co. (VMC)
The construction aggregate producer fell 4.4% after reporting earnings. VMC shares ended the session at $45.06, a loss of $2.06 on the day.

KLA-Tencor Corp. (KLAC)
A downgrade by Morgan Stanley hurting another semiconductor manufacturer as the stock fell 3.5%. KLAC shares finished Tuesday at $31.70, down $1.16 on the day.

Applied Materials Inc. (AMAT)
Following sector trends the semiconductor developer sank 3.3%. AMAT shares closed at $11.89, a loss of 41 cents on the day.

Rockwell Collins Inc. (COL)
The company’s worse-than-expected results sent shares down 3%, or $1.54, with shares last trading at $49.24.