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Obviously the Ultramarines having the most, I'd imagine it to be Blood Angels or Imperial Fists but aren't sure

I just checked lexicanum and wh40k (nowhere near reliable sources, but I'll take what I can get lol. They list the loyalist legion successors as follows:

Ultramarines: 35 successor chapters with 3 having been destroyed.
Blood Angels: 24 Successors Chapters. 1 of these chapters are only suspected to be of Blood Angel stock and unconfirmed.
Imperial Fists: 26 Successor Chapters, however 2 of them have been declared traitors. 2 of them are only suspected successors and not confirmed.
Dark Angels: 13 Successor Chapters. 1 of them have been destroyed and 2 of them are unconfirmed as Dark Angel geneseed.
Salamanders: 2 Successor Chapters. Both unconfirmed.
Space Wolves: 3 Successor Chapters. 1 of these is unconfirmed and one of them have been declared renegades.
Raven Guard. 15 Successor Chapters, 6 of them are unconfirmed.
Iron Hands: 6 Successor Chapters.
White Scars: 10 Successor Chapters.

Blood Angels actually have the second most chapters still standing. This makes sense to me, because at the Height of the Great Crusade the Blood Angels had 120,000 Space Marines to the Imperial Fists 100,000. Then the Imperial Fists lost 20,000 men at Phall, which put them on 80,000 pretty much straight away. So unless the Blood Angels lost 40,000 men at Signus Prime, they had more Men at the Battle of Terra then the Imperial Fists. Stands to reason that by the end of the battle they would have more Astartes than the Fists, and so be able to create more second founding chapters. Funnily enough, the Blood Angels actually had the 3rd largest loyalist legion after the Ultramarines and the Dark Angels according to 1d4chan

 Sgt_Smudge wrote:

Cassor the Damned wrote:
I just checked lexicanum and wh40k (nowhere near reliable sources, but I'll take what I can get lol. They list the loyalist legion successors as follows:

Ultramarines: 35 successor chapters with 3 having been destroyed.
Blood Angels: 24 Successors Chapters. 1 of these chapters are only suspected to be of Blood Angel stock and unconfirmed.
Imperial Fists: 26 Successor Chapters, however 2 of them have been declared traitors. 2 of them are only suspected successors and not confirmed.
Dark Angels: 13 Successor Chapters. 1 of them have been destroyed and 2 of them are unconfirmed as Dark Angel geneseed.
Salamanders: 2 Successor Chapters. Both unconfirmed.
Space Wolves: 3 Successor Chapters. 1 of these is unconfirmed and one of them have been declared renegades.
Raven Guard. 15 Successor Chapters, 6 of them are unconfirmed.
Iron Hands: 6 Successor Chapters.
White Scars: 10 Successor Chapters.

Blood Angels actually have the second most chapters still standing. This makes sense to me, because at the Height of the Great Crusade the Blood Angels had 120,000 Space Marines to the Imperial Fists 100,000. Then the Imperial Fists lost 20,000 men at Phall, which put them on 80,000 pretty much straight away. So unless the Blood Angels lost 40,000 men at Signus Prime, they had more Men at the Battle of Terra then the Imperial Fists. Stands to reason that by the end of the battle they would have more Astartes than the Fists, and so be able to create more second founding chapters. Funnily enough, the Blood Angels actually had the 3rd largest loyalist legion after the Ultramarines and the Dark Angels according to 1d4chan

This entirely hinges on the few Space Marine Chapters Lexicanum has shown.

What's to say that the Iron Hands don't have thirty other Chapters who haven't been listed? That every other Chapter has other, more obscure Chapters hidden away, except the Blood Angels? Because there's no definitive list of all SM Chapters, we can't use this method.

While I completely agree that without a definitive list this is difficult, I'd point to the fact that there is lots of evidence for the BA to be "up there" when it comes to successors. After all, Dark Angels are said to have relatively few successor chapters because they work so closely with their successors when hunting the fallen that the Inquisition thinks they are legion building. Space Wolves have their gene-seed Wulfven curse. All who were at Istaavan lost a lot of their men and geneseed, making it more difficult to create successors. Raven Guard got especially messed up by Alpha Legion. This in addition to the Blood Angels already being a large legion, means them having more successors than other legions should come as no surprise. However, the list above only accounts for around 130 chapters, and (using lexicanum as a source here unfortunately) lexicanums list of chapters is way over 350 (got bored counting after 250 and starting guessing) so it is definitely possible for the Blood Angels to end up being the chapter with the least successors. I'd just say that the Intel we have atm suggests the Blood Angels have many successor chapters. IIRC they called on loads when they needed to borrow their initiates in the BA omnibus.