Try: investor:"y combinator"

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"CM" (Consumer Stealth)

23andMe

4Square Labs

AbbyAve

Abroad101

Acara Global

ACI (dba Air Cargo Inc)

Aggregate Knowledge

AirMe

Alice.com

Ambient Devices

AppDiscover.com

Applico

ApplyGo.com

Apture

Avatron Software, Inc.

Avecora

Avvo

BackType

BestThinking

Betterment

BitTorrent

Bivi

Blank Label

Bleacher Report

blip.tv

BlipBoard

BlueNotif

BookMesh

BookRenter.com

Bountii

Boxi.com

Boxwish

Briteclick, Inc.

Bubble Motion

Bug Labs

BusinessElite

Busy Bee Advertising

Caffeine Energy Drink

CaptainU

Carbonite

Care.com

CareerCore, Inc.

CareerCore, Inc.

CareerMesh

CareerNumbers

Carsala

Causes

Centric Media

Cherepik Inc.

Cherrylips Designs

CHI.MP

Chosenlist.com LLC

Chumby

Cleeq.com

Clorox Creative Digital

CloudFap

College Prowler

CollegeHumor

CollegePeaks

Communispace

CondoCompare.com

Conduit Labs

Confidential

Confidential

Confidential

Confidential

Consumer Stealth Mode Startup

Covestor

Cozi

Crawdout

Crederity Inc.

Dawdle

Daylife

DeNA Global, Inc.

deviantART

Didiom

Digg

DISQUS

ditty.fm

Divvyshot, Inc

DocStoc

dusoto

DWPower

DYMPOL, Inc.

Earth Class Mail

EasyAutoSales.com

EatingVine

EGG HAUS, Inc.

Eleven Learning

Enformed

Etsy

Evernote

Evri

Experience Project

Facebook

FanDome

Fantazzle Fantasy Sports Games

Financial Startup

Fireside Realty

First Class Fashionista

FitPass Network LLC

Flashfoto

Fluther

FoodieLink

FreeCause, Inc.

Freshman Fund

Fridge Door

FriendFeed

fring

Frog Industry

FusionCharts Team

FutureFridays

Fuzzyshot

GameLayers

GetGlue.com

Going

Gorgos Group

GoTime

Grayson Labs

Grockit

Grooveshark.com

GrouperEye.com

Groupspeak

Hanso Corporation

Havadot

hayStocked

Heavy

Helio Wireless

Hello Baby

HelpMyCash

Heysan!

Heyzap

Hidden City Games, Inc.

Holstee

hotel toshi

Hotlist

Hover Technologies

Howcast Media, Inc.

HRM EduXcel Pvt. Ltd.

Huddler

iGOMobi

ImageShack Corporation

iMakeMovie.com

imeem

iminlikewithyou

Indylist

Inside Lacrosse

Invitacia

iOffer

iResume

IronScope

itemCASETR.com

J-Squared Media

Jamglue

JobGrades.com

Juju, Inc.

Junglecents

Justin.tv Inc.

Jutera Inc

kaboodle

KarmaKorn

Kashless, Inc.

Kayak

Key Ingredient

KickApps

Knewton

Kontera

Kosmix

Labortopia

lady luck creative

LearnHub

LearnVest

Lefora

Lesson Nine GmbH (Babbel.com)

Lifenote, Inc.

Lift Media

Lightspeed Venture - Entrepreneur-In-Residence

Likematter

LiveFyre

Loanio, Inc.,

Local Motors

logicbowl

Lookout

Loopt

LoyaltyMatch

Lumos Labs

MAJOR TECH INC

Maria Health

Mashable

Me.dium

Media Service Provider Ltd

Memeo

Memrise

MerchantCircle

Metaweb

Mindbloom

Mint

Mint Content

Mixbook

Mixtt, Inc.

Mobile Posse

Mobileti

MochiMedia

Modern Feed and Supply, Inc.

Momentum Design Lab

Moolah

Mozes

Mr Tweet / Discoverio

MUNI-55

Music Pictures Ltd

My CV and Me

MYANCHOR INC

Naanu

NationalBLS, the Buyer Listing Service

NeoHire.com

Netvibes, Inc.

None

NuVal LLC

Old Harbor Outfitters

One Block Off the Grid

oneforty

Oodle

OpenPeak, Inc.

Outside.in

Pandora

Parichute

PB&J Software, L.L.C.

Pelago

People Search Media

perceptu

PerkSpot

Pet Holdings, Inc.

Peter Burrowes – London Jeweller

PhotoZen

pingg

Pixable

Playfire.com

Playfirst

PlayHaven

PlayMesh

PlumWillow

Plurk

Pocket Tales

Polyvore

Posterous, Inc

Postling

PowerHouse dynamics

Predictify

PriceFeeder

ProductWiki Inc.

ProFounder

Punchbowl Software

Pustak.co.in

Quartet (Stealth Mode)

Quirky

RadiaShield Technologies

Ramamia

Ratingworld.com

Reach Export

rec.fm

Red Beacon

Redfin

Redux

RelationshipSecure

RentJuice

Rentomodo

RetireHub.com

Retlaw's Universal Robots

Retrevo

RhinoGATOR

Riot Games, Inc.

RiseSmart Inc

RockinSEO

Rockstar Music, Inc.

RooftopComedy

Say-Hey-Hey

SB Nation

Scrapblog

Scribd

SeatGeek

Security Associates Corp

See logo

seeqpod

Seesmic

Shareaholic Inc

Sharefam.com

Shhh....

Shmoop

ShoeDazzle.com Inc

Shop It To Me

ShopCast TV

Showzey

ShuffleChat

Shutl

Sidekick Technologies Inc.

Simply Hired

Single-Woman.TV

sivvle

Skydeck

Sleep.FM

SlideShare

Smith & Tinker

Social Concepts

SocialMedia

Socialthing!

Songbird

Songkick

Soocial

Soversa LLC

Sparkler.TV

Speedeals

SpinStitch

Splicefeed

sportlog

Sproost, Inc.

Sprout

StarStreet

Startuply

Stateless Creations

Stealth

Stealth Consumer Web Start-up

Stealth Gaming Startup

Stealth Health Care Start-up

stealth startup

Stealth Video Startup

Stealthy Financial Site

Stella & Dot

SterraClimb LLC

Strings

StumbleUpon

StyledOn

SuccessFuel, Inc.

Superkix

Sustainable Spaces

SwipeQ

syncables

Targeted Technology Solutions

TaskUs, LLC

Taylormark

TechSmart Solutions Group

TekeGldMpire Inc

The Daily Beast

The Extraordinaries

The Nashville Stars

The Noo Group Ltd

The PureSleep CompanyThe Pure Sleep Company

the Starting 11

TheOneAbout

Think

Thrive

TickrTalk

Tingz, Inc.

Tiny Pictures

tipjoy

to be discussed

TokBox

Touted

Trading Games, Inc.

Trading4u

triballove

TripIt

Trusty's

Tubefilter, Inc.

TubeMogul

Twiigg,Inc

Twitter

Tyacali Commons

Uniglam

UserVoice

uShip

Ustream.tv

Utique Inc.

ValueAppeal

Veedow.com

Veoh

veriCAR

Veritat Advisors

Vibio Inc

Viewzi

VisualCV, Inc.

Vivity Labs Inc.

Viximo

VUDU

Vuze

Wattzy

WebJuice

Webnode

Webs

Weebly

WeLike, LLC

Wellness Co

Wetac Corporation

Wetpaint

Whole Travel

WhyDoWork Inc.

WidgetBox

Wikia

Wikinvest

WineTamer

wis.dm

Wonder Warp Software LLC

XCruiser/Stealth StartUp

Xobni

Xoopit

Yardbarker

Yola Inc.

Yoomba

Yoono

You Plus

YouHaveIWant

YourTourBook.com

Z

Zazzle

Zenbe

ZepInvest

Zilok.com/ Zi Group SA

Zimple, Inc.

Zimride, Inc.

Zindagi

ZumBox, Inc.

ZumoDrive

Zuno

Zynga

Hmm... are we missing a start-up? Let us know.