Shares of Merck and Pfizer are trading higher Thursday afternoon, sending the Dow Jones Industrial Average into positive territory. Shares of Merck /zigman2/quotes/209956077/composite MRK -1.08% and Pfizer /zigman2/quotes/202877789/composite PFE -1.39% are contributing to the blue-chip gauge's intraday rally, as the Dow /zigman2/quotes/210598065/realtime DJIA -1.51% is trading 86 points, or 0.3%, higher. Merck's shares are up $1.89, or 2.4%, while those of Pfizer are up $0.89 (2.4%), combining for an approximately 19-point boost for the Dow. Other components contributing significantly to the gain include Procter & Gamble /zigman2/quotes/202894679/composite PG +0.49% , Raytheon Technologies Corp. /zigman2/quotes/203237915/composite RTX -3.65% , and Visa /zigman2/quotes/203660239/composite V -1.80% . A $1 move in any one of the 30 components of the benchmark results in a 6.86-point swing.