NEW YORK (AP) -- U.S. stocks are inching higher Tuesday as a number of companies announced deals after the Labor Day holiday. Bayer raised its offer for seed company Monsanto to $55.8 billion, while Canada's Enbridge agreed to buy Spectra Energy for $28 billion. Investors are buying bonds and stocks that pay big dividends after a survey found that services companies grew at their slowest pace in six years in August.
KEEPING SCORE: The Dow Jones industrial average gained 16 points, or 0.1 percent, to 18,507 as of 12:30 p.m. Eastern time. The Standard & Poor's 500 index rose 2 points, or 0.1 percent, to 2,182. The Nasdaq composite added 16 points, or 0.3 percent, to 5,265.
SURVEY SHOCK: The Institute for Supply Management said U.S. service companies grew at a far slower pace in August than they had in July. While service firms have expanded every month for more than six years, the reading on the survey was the weakest since February 2010. New orders and hiring grew at a slower rate and exports fell. Service firms accounted for almost all of U.S. job creation last month.
REACTION: The biggest gains Tuesday went to utility and phone companies, and investors also snapped up government bonds, sending prices higher and yields lower. That echoed a pattern seen in the first six weeks of this year, when the market fell hard and investors bought bonds and bond-like stocks for safety and yield. AES Corp. added 48 cents, or 4 percent, to $12.72 and NextEra Energy rose $2, or 1.6 percent, to $125.13.
The yield on the 10-year Treasury note declined to 1.53 percent from 1.61 percent late Friday.
Banks took the biggest losses. Those stocks tend to suffer when interest rates are low because it makes it harder for banks to make money from lending. Lincoln National lost $1.31, or 2.7 percent, to $46.75 and Citigroup fell 50 cents, or 1.1 percent, to $47.01.
GREEN HARVEST: German health care and chemicals conglomerate Bayer raised its offer for Monsanto to $127.50 a share. The latest offer values Monsanto at around $55.8 billion, or about $1 billion more than Bayer had offered preciously. Monsanto has already rejected two bids from Bayer. Its stock edged up 18 cents to $107.62.
ENERGIZED: Spectra Energy climbed $4.84, or 13.4 percent, to $41 after it agreed to be bought acquired. Enbridge will pay about $40.33 in cash and stock, or $28 billion, in a deal that would make North America's biggest energy infrastructure company.
DIAGNOSTICS DEAL: Industrial and medical device company Danaher will buy molecular diagnostics company Cepheid for $53 per share, or about $4 billion. Cepheid will become part of Danaher's diagnostics business, and its stock climbed $17.85, or 51.8 percent, to $52.27 while Danaher dipped $1.47, or 1.8 percent, to $79.72.
YATES SAYS YES: EOG Resources said it will buy oil and natural gas company Yates Petroleum for about $2.3 billion, mostly in stock. EOG gained $5.89, or 6.6 percent, to $94.80.
HIT THE GAS: Bus, truck and engine maker Navistar surged after it announced an investment from a unit of Volkswagen. The companies are also creating a joint venture that will help source parts for each of them, and they will share technology. Volkswagen Truck & Bus will pay $256 million for a 16.6 percent stake in Navistar. It will also name two directors to Navistar's board, and the company said Tuesday that chairman James Keyes will retire.
Navistar rose $5.98, or 42.5 percent, to $20.05, far above the $15.76 a share Volkswagen Truck & Bus is paying. Rival engine maker Cummins lost $7.57, or 6 percent, to $118.59.
FOX SETTLEMENT: 21st Century Fox fell 30 cents, or 1.2 percent, to $24.25 after it agreed to settle a sexual harassment lawsuit brought by former Fox News Channel anchor Gretchen Carlson. The case was brought against former Fox News CEO Roger Ailes. The company also apologized for the way Carlson was treated.
GE INTO 3-D: A pair of 3-D printing companies traded higher after General Electric agreed to spend $1.4 billion to buy two European 3-D printing companies. GE will buy Arcam AB and SLM Solutions Group AB and wants its 3-D printing business to bring in $1 billion in annual revenue by 2020. 3-D Systems Corp. rose 87 cents, or 5.8 percent, to $15.79 and Stratasys added 94 cents, or 4.3 percent, to $22.87.
ENERGY: Benchmark U.S. crude oil fell 11 cents to $44.33 a barrel in New York. Brent crude, the benchmark for international oil prices, lost 83 cents, or 1.7 percent, to $46.80 a barrel in London.
CURRENCIES: The dollar sank to 102.14 yen from 103.94 yen Friday. The euro rose to $1.1243 from $1.1159.
OVERSEAS: France's CAC 40 lost 0.3 percent and in Germany the DAX gained 0.1 percent. Britain's FTSE 100 shed 1 percent. The Nikkei 225 index in Japan rose 0.3 percent and in South Korea, the Kospi added 0.3 percent. Hong Kong's Hang Seng advanced 0.6 percent.