Is there a Thunderbolt hub?

Sure, Rene van den Abeelen…

there are lots of them… but as far as I know, only for USB-C ( Thunderbolt 3) … haven’t seen any for Thunderbolt 2 or original Thunderbolt… there might be some out there, but I haven’t found any…. Actually, I’d recommend you get a powered Thunderbolt 3 dock rather than a hub… the dock offers you more ports, more versatility, and because it’s powered, Thunderbolt things that are plugged into it will work better than with a hub… i don’t know exactly what year and model of iMac 27” you have.. so can’t say for sure what version of Thunderbolt you have on your iMac… or on your LaCie external drives… if you have an older version of Thunderbolt, the way to deal with that is to buy a Thunderbolt 3 to 2/1 converter/adapter… Apple sells one, for sure, and others might do so…

hope this helps you

John B

This Thunderbolt powered hub (from OWC) can be connected to Macs with the most recent Thunderbolt ports, or if you have Thunderbolt 1 or 2, the hub can be connected with Apple's Thunderbolt 2 to Thunderbolt 3 adaptor.

https://eshop.macsales.com/item/OWC/TB4HUB5P/

Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple

Check at OWC (MacSales.com). They have quite a few. If necessarily talk to their Customer Support people to see what they recommend for your particular Mac, workflow and budget. They are considered to be the premier 3rd party hardware provider for Macs.

Yes, & at one time they sold TB2 Docks.