No Feruchemy doesn't have it's own Shard. Brandon has basically said it. At the time we had Warbreaker, Elantris, and Mistborn. He said we have seen (I can't remember the numbers exactly) 5 shards, 4 of which we've seen direct effects of. Something like that though I'm pretty sure I'm wrong about the numbers.
Feruchemy is the balance between Ruin and Preservation. The epigraphs in HoA explicitly state it.
Looks like we're treading old ground, so I shall get the exact quote. I was thinking I could recite what he said perfectly, but I was wrong. Close, though! I promise, I'll be able to recite it eventually.
He said:
You've interacted with two directly.
One is a tough call. You've never met the Shard itself, but you've seen its power.
The other one you have not met directly, but have seen its influence.
Of course, excluding Ruin and Preservation.
Now, I believe the commonly accepted theories, way back on the Shards topic, were: 1) Endowment, 2) Dor, 3)Something about Jaddeth/Dakhor, 4) Hoid.
I'm not sure if I can reveal a piece of information (Omegas, don't get your pants a twist, it's nothing earth-shattering, just a question I asked), but I will say this: tee hee!