Already Out:
Simon vs the Homo Sapiens Agenda: The book YA Fiction Albertalli, B vs the movie DVD Love
The Giver: the book YA Fantasy Lowry, L vs the movie DVD Giver
Before I Fall: the book YA Fiction Oliver, L vs the movie BLU-RAY Before
13 Reasons Why: the book YA Fiction Asher, J vs the movie AC DVD
The Maze Runner: the book YA Fiction Dashner, J vs the movie DVD Maze
The Hunger Games: the book YA Fiction Collins, S vs the movie DVD Hunger
Miss Peregrine’s Home for Peculiar Children: the book YA Fantasy Riggs, R vs the movie DVD Miss
Paper Towns: the book YA Fiction Green, J vs the movie DVD Paper
D.U.F.F.: the book YA Fiction Keplinger, K vs the movie DVD Duff
A Monster Calls: the book YA Fantasy Ness, P vs the movie DVD Monster
The Outsiders: the book YA Fiction Hinton, S vs the movie DVD Outsiders
The 5th Wave: the book YA SF Yancey, R vs the movie BLU-RAY Fifth
The Princess Diaries: the book YA Fiction Cabot, M vs the movie JV DVD PRI
It’s Kind of a Funny Story: the book YA Fiction Vizzini, N vs the movie DVD It’s
I Am Number Four: the book YA Fiction Lore, P vs the movie DVD I
The Vampire Diaries: the book YA Fiction Smith, L vs the TV series AC DVD
The Perks of Being a Wallflower: the book PB Fiction Chbosky, S vs movie DVD Perks
The Fault in Our Stars: the book YA Fiction Green, J vs the movie DVD Fault
The Hobbit: the book YA Fiction Tolkein, J vs the movie DVD Hobbit
The Book Thief: the book YA Fiction Zusak, M vs the movie DVD Book
Divergent: the book YA Fiction Roth, V vs the movie DVD Divergent
Me and Earl and the Dying Girl – the book YA Fiction Andrews, J vs the movie DVD Me
Eragon: the book YA Fantasy Paolini, C vs the movie JV DVD ERA
Twilight: the book YA Fiction Meyer, S vs the book DVD Twilight
Flipped: the book YA Fiction Van Draanen, W vs the movie DVD Flipped
Holes: the book YA Fiction Sachar, L vs the movie DVD Holes
The Sisterhood of the Traveling Pants
: the book YA Fiction Brashares, A vs the movie DVD Sisterhood
Beautiful Creatures: the book YA Fiction Garcia, K vs the movie DVD Beautiful
Nick and Norah’s Infinite Playlist: the book YA Fiction Cohn, R vs the movie DVD Nick
Mortal Instruments: the City of Bones: the book YA Fantasy Clare, C vs the movie DVD Mortal
Everything Everything: the book YA Fiction Yoon, N vs the movie DVD Everything
To All The Boys I’ve Loved Before: the book YA Fiction Han, J vs IMDB/Netflix

On the Lookout For:
The Hate U Give: the book YA Fiction Thomas, A vs IMDB
Already released to theaters, Amazon suggests the DVD/Blu-Ray release date will be the 22nd of January next year.
Dumplin’: the book YA Fiction Murphy, J vs IMDB
With a release in a few days, the 7th of December, Netflix has taken up this charming title and for those missing the streaming site, select theaters will also be showing the title. Unfortunately after scavenging through the internet for WHICH theaters and finding next to nothing, my suggestion is to find a friend that has a Netflix account and have a movie night.
Hush, Hush: the book YA Fiction Fitzpatrick, B vs IMDB
Unfortunately with not much information, IMDB having last been updated July 2018 and currently in pre-production. Actors Liana Liberato (playing Nora Grey) and Wolfgang Novogratz (playing Patch Cipriano) have been chosen, alongside director Kellie Cyrus (directed The Vampire Diaries television series) for the being worked on movie.
Looking For Alaska: the book YA Fiction Green, J vs IMDB
As everyone knows, if John Green writes a book, it becomes super famous and generally gets turned into a movie; in this case, Hulu has picked up the title and will turn it into an eight episode mini-series. So far, no information on a release date, but be on the lookout for an update on Turtles All the Way Down which was optioned for a film.
Shatter Me: the book found on Axis360 vs IMDB (TV-2020)
With no set date, but a suggested release of year 2020, the book series by Tahereh Mafi has been chosen to become a TV series through ABC.
All The Bright Places: the book YA Fiction Niven, J vs IMDB
With suggested theater release in 2019, Brett Haley is set to direct the movie with Elle Fanning and Justice Smith as the main leads. Keep a lookout for a concrete date after filming is finished.
The Knife of Never Letting Go (Chaos Walking series): the book YA Fiction Ness, P  vs IMDB
Have you ever wanted to watch a movie with both Spiderman (Homecoming) and Rey (Star Wars)? Now’s your chance! With a release date of March 1st 2019, be on the lookout for this dystopian-styled, women-less New World.
Dr. Bird’s Advice For Sad Poets: the book YA Fiction Roskos, E vs IMDB
With not much information having been given about a release date and status set to post-production, director Yaniv Raz has kept information about the movie close to the vest.
Spontaneous: the book YA Fiction Starmer, A vs IMDB
Unfortunately lacking with release information (I’m sensing a theme here), IMDB claims the movie to be in post-production, and with many high school seniors spontaneously combusting, I would assume the special effects crew might need a bit of time to do their CGI magic.
Mortal Engines: the book YA Fiction Reeve, P vs IMDB
Watch out  for the theater release on December 14th for this film.
Stargirl: the book YA Fiction Spinelli, J vs IMDB
Taken up by Disney with no set release date, Stargirl looks to be an interesting take with Grace VanderWaal (winner of America’s Got Talent) as the adorable non-conformist.
The Sun is also a Star: the book YA Fiction Yoon, N vs IMDB
IMDB claiming a release date of May 17th of 2019, many fans are looking forward to see how the adaptation turns out.
Artemis Fowl: the book YA Fiction Colfer, E vs IMDB
With many years of rumors and excitement, we’re finally set for August 9th, next year for a release of the movie adaptation.

References:
Dumplin’ – Netflix’s post
Hush, Hush
 – Deadline.com’s post, Variety.com’s post
Looking for Alaska – Hollywoodreporter’s post, Bookriot’s post regarding Looking for Alaska, Bookriot’s post regarding Turtles All the Way Down
Shatter Me – Author’s Twitter post 
All the Bright Places
– Deadline’s post, IMDB’s post about Brett Haley
Chaos Walking – Variety’s post
Dr. Bird’s Advice for Sad Poets – Deadline’s post, IMDB’s post about Yaniv Raz
Spontaneous – Variety’s post
Stargirl – Deadline’s post
Artemis Fowl – Main website