No, with some exceptions they are all happening sequentially. Golarion's timeline moves at a 1:1 ratio to ours. The Lost Omens World Guide has a time line with the events of Rise of the Runelords in 4707, Curse of the Crimson Throne in 4708, Second Darkness happening in 4709, Serpent's Skull in 4710, Shattered Star in 4712, Reign of Winter and Wrath of the Righteous in 4713, Mummy's Mask in 4714, Hell's Rebels in 4715, Iron Gods in 4716, Ironfang Invasion in 4717, War for the Throne and Return of the Runelords in 4718, and Tyrant's Grasp in 4719. However, in most cases they're rather separated by distance, so the stuff going on in Varisia in 4707 and 4708 isn't going to have much effect on the stuff going on in the Mwangi Expanse in 4710, and the Queen of Irrisen's attempts at usurping Baba Yaga in 4713 isn't going to change anything about what happens in Osirion in 4714. I think the only APs back in 1e that build on previous events are Rise of the Runelords -> Jade Regent -> Shattered Star -> Return of the Runelords.
The main exceptions I can think of are 2e APs: Strength of Thousands officially starts in 4721, but is assumed to take place over the course of several years as the PCs start out at students at the Magaambiya; and the current AP Season of Ghosts is supposed to take place like a century ago (I don't have the exact year).