Overall Fortune 100 job search activity declined while middle-market activity increased, according to Hudson’s Q2 2015 Job Seeker Pulse report, which analyzes the online job search activity of Fortune 100 and middle market company employees. However, most of the middle market activity increase was propelled by a late-June surge, which was not mirrored by Fortune 100 employees.

While the millennials in both the Fortune 100 and Middle Market remained relatively active, the greatest increases in quarter-over-quarter job search activity belonged to other groups. Those with the most notable increases include the Fortune 100 Gen Xer entry levels — the only Fortune 100 group to increase job seeking behavior during the second quarter — and the middle market boomer entry-level employees.

The study is based on data gleaned from the Joberate platform, which monitors an individual’s digital foot­print to establish job seeking behavior activity. It tracks as many as 6,000 different data points from publicly available data sources including social media, public job boards and sources licensed by authorized data service providers like Twitter’s GNIP. The “J-Score” represents an individual score and the “J-Index” represents an aggregate score.

The Fortune 100 entry levels, including all sub groups, and middle-market Gen Y upper management registered the greatest decreases in job search activity in the second quarter compared to the first quarter, with percentage point declines of 45.7 and 57.1 respectively.

Also notable is that the middle market boomer entry-level group registered a 37.54 J-Index from June 27 to June 30, marking the highest J-Index of any group during the quarter. On the flip side, Fortune 100 boomer entry level employees posted a J-Index of 5.03 on June 26, the sub group with the lowest J-Index.

Monthly average J-Index:

• April: Fortune 100, 8.36: Middle market, 12.20
• May: Fortune 100, 7.66: Middle market, 10.95
• June: Fortune 100, 8.09: Middle market, 15.89

The Hudson Job Seeker Pulse study tracked second-quarter 2015 J-Scores for 7,593 employees of Fortune 100 companies and 7,097 employees of middle market companies. Fortune 100 companies include the 100 largest public and private US companies according to gross revenue figures, as published annually by Fortune magazine. Middle-market companies are companies with between 1,000 and 10,000 employees as stated in their LinkedIn company profiles.