'Hold' is an irregular verb. It has the 3rd person form 'holds', the -ing form 'holding' but an irregular preterite and past participle 'held'. These latter two may be over-regularised to *'holded'. There is also an archaic past participle, 'holden', sometimes found poetically.
There a few compound verbs with hold as the second part, particularly 'withhold' and 'uphold'.