But he acknowledged that his "Future Movement", Hezbollah's main rival, was losing a third of its seats. Results reflecting existing fragmentation in Lebanese Sunni field where several contenders compete for leadership.
A higher turnout had been expected after the long electoral hiatus but the vote was the first to follow a law passed in 2017 and the pre-printed ballots used Sunday appeared to confuse some voters.
This year's vote is according to a new election law that is based on proportional representation.
The group, whose arsenal outguns the army's does not derive its dominant status on the Lebanese scene from the ballot box but the new breakdown of parliament will increase its political legitimacy.
More than 500 candidates ran for 128 seats in Lebanon's National Assembly.
The Hezbollah is considered a terror outfit by the U.S. while the European Union accords the same tag to its military wing.
Lebanon's politics has been divided by the Syrian war, with some parties supporting the Iran-sponsored Hezbollah's intervention in Syria to aid President Bashar Assad, and other Saudi-aligned parties opposed to it.
Hariri went on to assert that Lebanon "can only be governed by all its political components. we must work together to build our country". In Lebanon's power-sharing system, this allows Hariri to remain the top contender for prime minister in the next government. Definitive results are scheduled to be released on Wednesday.
Official figures put turnout at around 50 per cent, down from previous elections, and many who had stayed away cited disillusionment at the prospects for change. Israeli minister Naftali Bennet has been first to speak.
"Hizbollah seeks to translate politically in Lebanon its "victory" in Syria, but it does not want to talk too loudly about it". A new turn in regional status quo to which Riyadh and Israel try to curb at all costs.
That would have meant roughly 105,000 Sunni Muslim voting in his favor, but many stayed home, unimpressed with the list of candidates or with Hariri himself, who spent two entire years living in self-imposed exile in Saudi Arabia, letting his constituency wrestle with its own worries, like crippling inflation, garbage overflows, and security breaches caused by "spillovers" from the Syrian conflict.
"Lebanon is an independent country".
The vote came a week after Lebanese living oversees voted in 39 countries around the world.
The final tally was set to be announced later on Monday.
However, in early hours of Monday, different parties were already clear about results that filtered ir followers.
"It is only normal due to the demographic nature of Baalbek/Hermel to lose a couple of seats for other parts, but their attempt was to take a Shiite seat... they even stated that one Shiite seat equals 127 parliaments members according to them". It was precisely balacea celebration that left on Sunday night one dead and three serious wounded.