Apple Inc.'s /zigman2/quotes/202934861/composite AAPL -0.81% 3.9% stock surge Wednesday on the back of the technology giant's upbeat fiscal third-quarter earnings report came just in time to lift into first place as the top Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA -0.19% performer this month, both in price and percentage gains. The stock rose $19.00, or 9.6%, in July. That added about 129 points to the Dow's price, which increased by 555 points this month. The next biggest contributors to the Dow's gain were shares of Goldman Sachs Group Inc. /zigman2/quotes/209237603/composite GS -0.85% , which rose $15.81, or 7.7%, to add 107 points to the Dow, followed by International Business Machines Corp. /zigman2/quotes/203856914/composite IBM +0.53% , which hiked up $11.20, or 8.1%, to add 76 points to the Dow. Meanwhile, Boeing Co.'s stock /zigman2/quotes/208579720/composite BA -0.51% was the biggest drag, as it fell $16.90, or 4.6%, to shave about 115 points off the Dow.