I don't know if this is an issue with React or IE11 but when an the input initially contains an EN-dash (8211) it fires the change event. 
JSFiddle http://jsfiddle.net/uH539/10/

/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule ChangeEventPlugin
 */
'use strict';
var EventConstants = require('EventConstants');
var EventPluginHub = require('EventPluginHub');
var EventPropagators = require('EventPropagators');
var ExecutionEnvironment = require('ExecutionEnvironment');
var ReactDOMComponentTree = require('ReactDOMComponentTree');
var ReactUpdates = require('ReactUpdates');
var SyntheticEvent = require('SyntheticEvent');
var getEventTarget = require('getEventTarget');
var isEventSupported = require('isEventSupported');
var isTextInputElement = require('isTextInputElement');
var keyOf = require('keyOf');