Ansys (ANSS) witnessed a jump in share price last session on above-average trading volume. The latest trend in earnings estimate revisions for the stock doesn't suggest further strength down the road.

The Trade Desk shares are up 14% in premarket trading Tuesday, a day after S&P Dow Jones Indices said the digital advertising company will be replacing software maker Ansys in the S&P 500 Index.

TTD stock rose after being added to S&P 500, receiving positive ratings from analysts. Price forecast lowered but still bullish on long-term growth.

Sysnopsys' ( NASDAQ: SNPS) acquisition of Ansys ( NASDAQ: ANSS) will transform the company into the leading chip-to-system design software firm with a combined revenue of more than $10B in fiscal year 2026, according to Needham.

Shares of Trade Desk Inc (NASDAQ:TTD) are up 11.4% to trade at $84.06 this morning, after news broke that the software firm will replace Ansys (ANSS) on the S&P 500 Index (SPX) before the open this Friday, July 18. The change comes after Synopsys (SNPS) agreed to purchase Ansys for $35 billion by the end of this week.

These stocks are making notable moves in Monday's premarket action: Ansys shares climbed over 5% after semiconductor design software group Synopsys on Monday [gained regulatory approval from China](

The merged ANSYS and Synopsys companies will be one of the most important players in the future of AI. Click here to find out why ANSS is a Buy.

Stocks often rally when they're added to a major index, as fund managers need to rebalance their portfolios to reflect the changes. With a market cap of $37 billion, the company falls right about in the middle of the S&P 500 by valuation.

Trade Desk’s stock is soaring, with the ad-tech company set to replace Ansys in the benchmark index later this week.