More "S" hostas -
'Sparkler', June 4, new 2012. This sport of 'Fireworks' grows far better for me than its parent (no longer in my garden) did. But it's now getting crowded by 'Galaxy' behind it and a seedling from 'Pixie Vamp' in front of it and will need a better space of its own in 2025.
'Spilt Milk', Aug. 8, new 2006. This grew well for along time and I've got two nice seedlings from it - one variegated and one that looks just like it, but is larger than 'Milkmaid'. But of late, starting after a late April ice storm in 2018, this was doing poorly in the garden. I dug it, cleaned out tree roots, and replanted, but it still didn't do well; so it's now in a large pot and we are watching it. If it doesn't improve, I'll just grow the seedling instead.

Here's a picture of that seedling from 2016.
'Stained Glass', July 25, new 2004. 2006 Hosta of the Year. This had started to decline so I dug it, enriched the area it grows in and replanted and a couple of years later it's doing well.
'Stand By Me', Aug. 8, new 2012. This sport for 'June' is very similar to 'Touch of Class', except it's smaller and likely not tetraploid.
'Stiletto', June 30, new 2009. This mini was a gift from a friend and came in a styrofoam cup. It has grown well for me.