It will take more than Federal Reserve plans to pare back monetary stimulus, turmoil in Syria or the U.S. debt-ceiling debate to curb a full fall slate of initial public offerings, bankers and investors say.

The IPO market is on track for its busiest year since the financial crisis. Investors point to a flood of cash into stock mutual funds and what many view as reasonable valuations relative to annual profit expectations.

This week, OCI Resources LP, a miner of salts and minerals used in construction and auto production, launched a road show to shop its $100 million IPO. Other companies in the pipeline include online textbook-rental business Chegg Inc., real-estate brokerage RE/MAX Holdings Inc. and advertising-technology firm Rocket Fuel Inc.

In addition, traders expect a steady stream of new share sales from public companies, such as Wednesday's $1 billion follow-on offering from LinkedIn Corp. and the sale of a $1.1 billion block of stock in chemical maker LyondellBasell Industries NV.

A series of successful offerings would indicate investor demand for stocks remains robust amid uneven economic growth and nervousfinancial markets. The S&P 500 is within 5% of its all-time high set earlier this year, despite whipsaw trading in U.S. Treasury securities and a sharp selloff in emerging markets.

'We'd have to have a deeper correction before we'd see a pause in the IPO market,' said Chris Baggini, senior portfolio manager at Turner Investments, which manages $10 billion.

Due to rules enacted last year that enable companies with less than $1 billion in annualrevenue to file initial IPO paperwork confidentially, it is harder than in the past to gauge the size of the IPO pipeline. But 2013 is on track to the busiest year since 2007. Through August, 134 companies had gone public in the U.S., up 37% from this point in 2012.

Many of the companies coming to market have been relatively small, fast-rising businesses that aren't strongly influenced by so-called macro events such as Middle East tension, Mr. Baggini said. He bought shares of one such company, event-planning software maker Cvent Inc., in its IPO last month.

Daniel Cole, who oversees about $400 million as a senior portfolio manager at Manulife Asset Management, says the IPO market is in a sweet spot where valuations on new stocks haven't become overheated but the market is up enough to attract private companies looking to cash in. He said a Fed stimulusreduction has been so well telegraphed that the announcement after a two-day policy-setting meeting on Sept. 18 shouldn't spook the market. 'A lot of this anxiety over tapering is already digested,' he said.

Investors added $10.8 billion in net new cash to U.S. stock-focused mutual funds in August through the 28th, according to preliminary figures from Lipper.

Companies that went public this year are up 27% on average since their debuts, as of Wednesday, according to Dealogic. That is better than the 16% advance in the S&P 500 year-to-date.

Ted Tobiason, head of technology equity capital markets at Deutsche Bank AG, said improving share performance among some prominent, initially poor-performing technology IPOs such as Facebook Inc. and Groupon Inc. are beginning to draw more tech deals to market.