The conservative Homeland Union–Lithuanian Christian Democrats holds onto its number two spot with 10 percent support, but the Lithuanian Social Democratic Party and the Liberal Movement are hot on its heels with 9 percent each.
The conservatives' popularity dropped by 4 percentage points over the month. Changes in other parties' rankings were within the error margin.
The survey was conducted before prosecutors said they suspected the Liberal Movement of having indirectly received illegal financial support from MG Baltic, one of the country's biggest business groups.
With support from 3 percent of respondents, the Order and Justice party is the closest to clearing the 5 percent hurdle required to enter the Seimas.
Two percent of those polled said they would vote for the Electoral Action of Poles in Lithuania–Christian Families Alliance, the Lithuanian Freedom Union and the Lithuanian Greens Party each.
The survey shows that all of Lithuania's top-ranking politicians continue to enjoy rather high approval ratings.
Prime Minister Saulius Skvernelis last month was rated favorably by 67 percent of respondents, followed by President Dalia Grybauskaitė with 63 percent, LFGU chairman Ramūnas Karbauskis with 51 percent and Viktoras Pranckietis, the speaker of the Seimas, with 49 percent.
RAIT polled 853 people aged between 15 and 74 years on March 10-26. The results of the survey have an error margin of 3.4 percent.