| DELAWARE                 | 36-4324765                           |
|--------------------------|--------------------------------------|
| (State of Incorporation) | (I.R.S. Employer Identification No.) |

| 870 NORTH COMMONS DRIVE                  | 60504      |
|------------------------------------------|------------|
| AURORA, ILLINOIS                         | (Zip Code) |
| (Address of principal executive offices) |       |

|   | YES | X | NO |   |   |
|--------|-----|---|----|--------|--------|

|   | YES | X | NO |   |   |
|--------|-----|---|----|--------|--------|

|   | Large accelerated filer | X |      Accelerated filer |   |      Non-accelerated filer |   |      Smaller reporting company |   |   |
|--------|-------------------------|---|--------------------------------------------|--------|------------------------------------------------|--------|----------------------------------------------------|--------|--------|

|   | YES |   | NO | X |   |
|--------|-----|--------|----|---|--------|

----

| Part I. Financial Information | Page                                                                                          |
|-------------------------------|-----------------------------------------------------------------------------------------------|
|                          |                                                                                          |   |
| Item 1.                       | Unaudited Financial Statements                                                                |   |
|                          |                                                                                          |   |
|                          | Consolidated Statements of Income Three Months Ended December 31, 2013 and 2012               | 3 |
|                          |                                                                                          |   |
|                          | Consolidated Statements of Comprehensive Income Three Months Ended December 31, 2013 and 2012 | 4 |
|                          |                                                                                          |   |
|                          | Consolidated Balance Sheets December 31, 2013, and September 30, 2013                         | 5 |
|                          |                                                                                          |   |
|                          | Consolidated Statements of Cash Flows Three Months Ended December 31, 2013 and 2012           | 6 |
|                          |                                                                                          |   |
|                          | Notes to the Consolidated Financial Statements                                                | 7 |
|                          |                                                                                          |   |
| Item 2.                       | Management's Discussion and Analysis of Financial Condition and Results of Operations         | 19 |
|                          |                                                                                          |   |
| Item 3.                       | Quantitative and Qualitative Disclosures About Market Risk                                    | 26 |
|                          |                                                                                          |   |
| Item 4.                       | Controls and Procedures                                                                       | 27 |
|                          |                                                                                          |   |
| Part II. Other Information    |                                                                                          |
|                          |                                                                                          |   |
| Item 1.                       | Legal Proceedings                                                                             | 28 |
|                          |                                                                                          |   |
| Item 1A.                      | Risk Factors                                                                                  | 28 |
|                          |                                                                                          |   |
| Item 2.                       | Unregistered Sales of Equity Securities and Use of Proceeds                                   | 32 |
|                          |                                                                                          |   |
| Item 6.                       | Exhibits                                                                                      | 33 |
|                          | Signatures                                                                                    | 34 |

----

index

|                                        |   | Three Months Ended December 31, |    |
|---------------------------------------------|--------|---------------------------------|---------|
|                                        |   | 2013                            |    |   | 2012 |   |
|                                        |   |                                 |    |   |  |   |
| Revenue                                     |   | $                               | 100,515 |   |   | $ | 106,533 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Cost of goods sold                          |   |                            | 52,801  |   |   |   | 56,494 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Gross profit                                |   |                            | 47,714  |   |   |   | 50,039 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Operating expenses:                         |   |                            |    |   |   |   |   |   |
| Research, development and technical         |   |                            | 14,571  |   |   |   | 15,316 |   |
| Selling and marketing                       |   |                            | 6,707   |   |   |   | 7,109 |   |
| General and administrative                  |   |                            | 10,726  |   |   |   | 10,954 |   |
| Total operating expenses                    |   |                            | 32,004  |   |   |   | 33,379 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Operating income                            |   |                            | 15,710  |   |   |   | 16,660 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Interest expense                            |   |                            | 872     |   |   |   | 953 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Other income, net                           |   |                            | 617     |   |   |   | 854 |   |
| Income before income taxes                  |   |                            | 15,455  |   |   |   | 16,561 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Provision for income taxes                  |   |                            | 4,147   |   |   |   | 6,858 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Net income                                  |   | $                               | 11,308  |   |   | $ | 9,703 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Basic earnings per share                    |   | $                               | 0.47    |   |   | $ | 0.42 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Weighted average basic shares outstanding   |   |                            | 23,590  |   |   |   | 22,845 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Diluted earnings per share                  |   | $                               | 0.45    |   |   | $ | 0.41 |   |
|                                        |   |                            |    |   |   |   |   |   |
| Weighted average diluted shares outstanding |   |                            | 24,623  |   |   |   | 23,658 |   |

----

index

|                                           |   | Three Months Ended December 31, |   |
|------------------------------------------------|--------|---------------------------------|--------|
|                                           |   | 2013                            |   |   | 2012 |   |
|                                           |   |                                 |   |   |  |   |
| Net income                                     |   | $                               | 11,308 |   |   | $ | 9,703 |   |
|                                           |   |                            |   |   |   |   |   |   |
| Other comprehensive income (loss), net of tax: |   |                            |   |   |   |   |   |   |
|                                           |   |                            |   |   |   |   |   |   |
| Foreign currency translation adjustments       |   |                            | (4,760 | ) |   |   | (4,696 | ) |
| Unrealized gain on investments                 |   |                            | 151    |   |   |   | - |   |
|                                           |   |                            |   |   |   |   |   |   |
| Other comprehensive income (loss), net of tax  |   |                            | (4,609 | ) |   |   | (4,696 | ) |
|                                           |   |                            |   |   |   |   |   |   |
| Comprehensive income                           |   | $                               | 6,699  |   |   | $ | 5,007 |   |

----

index

|                                                                                                                                                        |   | December 31, 2013 |     |   | September 30, 2013 |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------|----------|--------|--------------------|--------|
| ASSETS                                                                                                                                                      |   |                   |     |   |                    |   |
| Current assets:                                                                                                                                             |   |                   |     |   |                    |   |
| Cash and cash equivalents                                                                                                                                   |   | $                 | 246,463  |   |               | $      | 226,029 |   |
| Accounts receivable, less allowance for doubtful accounts of $1,370 at December 31, 2013, and $1,532 at September 30, 2013                                  |   |              | 52,078   |   |               |   | 54,640 |   |
| Inventories                                                                                                                                                 |   |              | 66,118   |   |               |   | 63,786 |   |
| Prepaid expenses and other current assets                                                                                                                   |   |              | 24,331   |   |               |   | 13,598 |   |
| Deferred income taxes                                                                                                                                       |   |              | 7,746    |   |               |   | 7,659 |   |
| Total current assets                                                                                                                                        |   |              | 396,736  |   |               |   | 365,712 |   |
|                                                                                                                                                        |   |              |     |   |               |   |   |   |
| Property, plant and equipment, net                                                                                                                          |   |              | 109,514  |   |               |   | 111,985 |   |
| Goodwill                                                                                                                                                    |   |              | 43,801   |   |               |   | 44,306 |   |
| Other intangible assets, net                                                                                                                                |   |              | 9,060    |   |               |   | 9,785 |   |
| Deferred income taxes                                                                                                                                       |   |              | 6,085    |   |               |   | 10,291 |   |
| Other long-term assets                                                                                                                                      |   |              | 10,529   |   |               |   | 12,427 |   |
| Total assets                                                                                                                                                |   | $                 | 575,725  |   |               | $      | 554,506 |   |
|                                                                                                                                                        |   |              |     |   |               |   |   |   |
| LIABILITIES AND STOCKHOLDERS' EQUITY                                                                                                                        |   |              |     |   |               |   |   |   |
| Current liabilities:                                                                                                                                        |   |              |     |   |               |   |   |   |
| Accounts payable                                                                                                                                            |   | $                 | 15,825   |   |               | $      | 16,663 |   |
| Accrued expenses, income taxes payable and other current liabilities                                                                                        |   |              | 28,503   |   |               |   | 39,899 |   |
| Current portion of long-term debt                                                                                                                           |   |              | 12,031   |   |               |   | 10,938 |   |
| Total current liabilities                                                                                                                                   |   |              | 56,359   |   |               |   | 67,500 |   |
|                                                                                                                                                        |   |              |     |   |               |   |   |   |
| Long-term debt, net of current portion                                                                                                                      |   |              | 147,657  |   |               |   | 150,937 |   |
| Deferred income taxes                                                                                                                                       |   |              | 1,397    |   |               |   | 1,559 |   |
| Other long-term liabilities                                                                                                                                 |   |              | 7,706    |   |               |   | 7,433 |   |
| Total liabilities                                                                                                                                           |   |              | 213,119  |   |               |   | 227,429 |   |
|                                                                                                                                                        |   |              |     |   |               |   |   |   |
| Commitments and contingencies (Note 9)                                                                                                                      |   |              |     |   |               |   |   |   |
| Stockholders' equity:                                                                                                                                       |   |              |     |   |               |   |   |   |
| Common Stock: Authorized: 200,000,000 shares, $0.001 par value; Issued: 31,504,320 shares at December 31, 2013, and 30,213,577 shares at September 30, 2013 |   |              | 31       |   |               |   | 30 |   |
| Capital in excess of par value of common stock                                                                                                              |   |              | 415,107  |   |               |   | 376,206 |   |
| Retained earnings                                                                                                                                           |   |              | 192,134  |   |               |   | 180,826 |   |
| Accumulated other comprehensive income                                                                                                                      |   |              | 12,827   |   |               |   | 17,436 |   |
| Treasury stock at cost, 7,097,960 shares at December 31, 2013, and 6,866,675 shares at September 30, 2013                                                   |   |              | (257,493 | )      |               |   | (247,421 | ) |
| Total stockholders' equity                                                                                                                                  |   |              | 362,606  |   |               |   | 327,077 |   |
|                                                                                                                                                        |   |              |     |   |               |   |   |   |
| Total liabilities and stockholders' equity                                                                                                                  |   | $                 | 575,725  |   |               | $      | 554,506 |   |

----

index

|                                                                              |   | Three Months Ended December 31, |    |
|-----------------------------------------------------------------------------------|--------|---------------------------------|---------|
|                                                                              |   | 2013                            |    |   | 2012 |   |
| Cash flows from operating activities:                                             |   |                                 |    |   |  |   |
| Net income                                                                        |   | $                               | 11,308  |   |   | $ | 9,703 |   |
| Adjustments to reconcile net income to net cash provided by operating activities: |   |                            |    |   |   |   |   |   |
| Depreciation and amortization                                                     |   |                            | 5,009   |   |   |   | 5,555 |   |
| Provision for doubtful accounts                                                   |   |                            | (122    | ) |   |   | 132 |   |
| Share-based compensation expense                                                  |   |                            | 3,366   |   |   |   | 3,494 |   |
| Deferred income tax expense                                                       |   |                            | 4,733   |   |   |   | 2,998 |   |
| Non-cash foreign exchange (gain)/loss                                             |   |                            | (60     | ) |   |   | 1,278 |   |
| (Gain)/loss on disposal of property, plant and equipment                          |   |                            | (150    | ) |   |   | 29 |   |
| Other                                                                             |   |                            | (175    | ) |   |   | (905 | ) |
| Changes in operating assets and liabilities:                                      |   |                            |    |   |   |   |   |   |
| Accounts receivable                                                               |   |                            | 1,311   |   |   |   | (12,350 | ) |
| Inventories                                                                       |   |                            | (3,817  | ) |   |   | 1,693 |   |
| Prepaid expenses and other assets                                                 |   |                            | (10,292 | ) |   |   | 2,881 |   |
| Accounts payable                                                                  |   |                            | (363    | ) |   |   | (3,764 | ) |
| Accrued expenses, income taxes payable and other liabilities                      |   |                            | (10,409 | ) |   |   | (4,541 | ) |
| Net cash provided by operating activities                                         |   |                            | 339     |   |   |   | 6,203 |   |
|                                                                              |   |                            |    |   |   |   |   |   |
| Cash flows from investing activities:                                             |   |                            |    |   |   |   |   |   |
| Additions to property, plant and equipment                                        |   |                            | (3,690  | ) |   |   | (3,023 | ) |
| Proceeds from the sale of property, plant and equipment                           |   |                            | 160     |   |   |   | - |   |
| Proceeds from the sale of investments                                             |   |                            | 2,113   |   |   |   | - |   |
| Net cash used in investing activities                                             |   |                            | (1,417  | ) |   |   | (3,023 | ) |
|                                                                              |   |                            |    |   |   |   |   |   |
| Cash flows from financing activities:                                             |   |                            |    |   |   |   |   |   |
| Repayment of long-term debt                                                       |   |                            | (2,187  | ) |   |   | (4,375 | ) |
| Repurchases of common stock                                                       |   |                            | (10,072 | ) |   |   | (11,256 | ) |
| Net proceeds from issuance of stock                                               |   |                            | 32,606  |   |   |   | 4,238 |   |
| Tax benefits associated with share-based compensation expense                     |   |                            | 1,921   |   |   |   | 591 |   |
| Principal payments under capital lease obligations                                |   |                            | -       |   |   |   | (21 | ) |
| Net cash provided by (used in) financing activities                               |   |                            | 22,268  |   |   |   | (10,823 | ) |
|                                                                              |   |                            |    |   |   |   |   |   |
| Effect of exchange rate changes on cash                                           |   |                            | (756    | ) |   |   | (1,197 | ) |
| Increase (decrease) in cash and cash equivalents                                  |   |                            | 20,434  |   |   |   | (8,840 | ) |
| Cash and cash equivalents at beginning of period                                  |   |                            | 226,029 |   |   |   | 178,459 |   |
| Cash and cash equivalents at end of period                                        |   | $                               | 246,463 |   |   | $ | 169,619 |   |

| Supplemental disclosure of non-cash investing and financing activities:                                         |   |        |   |   |        |   |
|-----------------------------------------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|
| Purchases of property, plant and equipment in accrued liabilities and accounts payable at the end of the period |   | $      | 1,408  |   |   | $      | 1,727 |   |
| Issuance of restricted stock                                                                                    |   |   | 7,067  |   |   |   | 5,358 |   |

----

index

----

index

| December 31, 2013             |   | Level 1 |    |   | Level 2 |   |   | Level 3 |   |   | TotalFair Value |   |
|-------------------------------|--------|---------|---------|--------|---------|--------|--------|---------|--------|--------|-----------------|--------|
| Cash and cash equivalents     |   | $       | 246,463 |   |    | $      | -      |    |   | $      | -               |   |   | $ | 246,463 |   |
| Auction rate securities (ARS) |   |    | -       |   |    |   | -      |    |   |   | 6,087           |   |   |   | 6,087 |   |
| Other long-term investments   |   |    | 1,636   |   |    |   | -      |    |   |   | -               |   |   |   | 1,636 |   |
| Total                         |   | $       | 248,099 |   |    | $      | -      |    |   | $      | 6,087           |   |   | $ | 254,186 |   |

| September 30, 2013            |   | Level 1 |    |   | Level 2 |   |   | Level 3 |   |   | TotalFair Value |   |
|-------------------------------|--------|---------|---------|--------|---------|--------|--------|---------|--------|--------|-----------------|--------|
| Cash and cash equivalents     |   | $       | 226,029 |   |    | $      | -      |    |   | $      | -               |   |   | $ | 226,029 |   |
| Auction rate securities (ARS) |   |    | -       |   |    |   | -      |    |   |   | 7,966           |   |   |   | 7,966 |   |
| Other long-term investments   |   |    | 1,375   |   |    |   | -      |    |   |   | -               |   |   |   | 1,375 |   |
| Total                         |   | $       | 227,404 |   |    | $      | -      |    |   | $      | 7,966           |   |   | $ | 235,370 |   |

----

index

| Balance as of October 1, 2013    |   | $      | 7,966  |   |
|----------------------------------|--------|--------|--------|--------|
| Net sales of ARS                 |   |   | (2,113 | )      |
| Reversal of temporary impairment |   |   | 234    |   |
| Balance as of December 31, 2013  |   | $      | 6,087  |   |

|            |   | December 31, 2013 |   |   | September 30, 2013 |   |
|-----------------|--------|-------------------|--------|--------|--------------------|--------|
|            |   |                   |   |   |                    |   |
| Raw materials   |   | $                 | 38,479 |   |               | $      | 38,004 |   |
| Work in process |   |              | 3,962  |   |               |   | 5,001 |   |
| Finished goods  |   |              | 23,677 |   |               |   | 20,781 |   |
| Total           |   | $                 | 66,118 |   |               | $      | 63,786 |   |

----

index

|                                                       |   | December 31, 2013     |   |   | September 30, 2013       |   |
|------------------------------------------------------------|--------|-----------------------|--------|--------|--------------------------|--------|
|                                                       |   | Gross Carrying Amount |   |   | Accumulated Amortization |   |   | Gross CarryingAmount |   |   | Accumulated Amortization |   |
| Other intangible assets subject to amortization:           |   |                       |   |   |                          |   |   |  |   |   |  |   |
| Product technology                                         |   | $                     | 8,326  |   |                     | $      | 6,069 |   |   | $ | 8,362 |   |   | $ | 5,853 |   |
| Acquired patents and licenses                              |   |                  | 8,270  |   |                     |   | 7,301 |   |   |   | 8,270 |   |   |   | 7,196 |   |
| Trade secrets and know-how                                 |   |                  | 2,550  |   |                     |   | 2,550 |   |   |   | 2,550 |   |   |   | 2,550 |   |
| Distribution rights, customer lists and other              |   |                  | 12,365 |   |                     |   | 7,721 |   |   |   | 12,496 |   |   |   | 7,484 |   |
|                                                       |   |                  |   |   |                     |   |   |   |   |   |   |   |   |   |   |   |
| Total other intangible assets subject to amortization      |   |                  | 31,511 |   |                     |   | 23,641 |   |   |   | 31,678 |   |   |   | 23,083 |   |
|                                                       |   |                  |   |   |                     |   |   |   |   |   |   |   |   |   |   |   |
| Total other intangible assets not subject to amortization* |   |                  | 1,190  |   |                     |   |   |   |   |   | 1,190 |   |   |   |   |   |
|                                                       |   |                  |   |   |                     |   |   |   |   |   |   |   |   |   |   |   |
| Total other intangible assets                              |   | $                     | 32,701 |   |                     | $      | 23,641 |   |   | $ | 32,868 |   |   | $ | 23,083 |   |

| Fiscal Year       |   | Estimated Amortization Expense |   |
|-------------------|--------|--------------------------------|--------|
| Remainder of 2014 |   | $                              | 1,826  |   |
| 2015              |   |                           | 2,409  |   |
| 2016              |   |                           | 1,993  |   |
| 2017              |   |                           | 1,164  |   |
| 2018              |   |                           | 460    |   |

----

index

|                        |   | December 31, 2013 |   |   | September 30, 2013 |   |
|-----------------------------|--------|-------------------|--------|--------|--------------------|--------|
|                        |   |                   |   |   |                    |   |
| Auction rate securities     |   | $                 | 6,087  |   |               | $      | 7,966 |   |
| Other long-term assets      |   |              | 2,806  |   |               |   | 3,086 |   |
| Other long-term investments |   |              | 1,636  |   |               |   | 1,375 |   |
| Total                       |   | $                 | 10,529 |   |               | $      | 12,427 |   |

|                                          |   | December 31, 2013 |   |   | September 30, 2013 |   |
|-----------------------------------------------|--------|-------------------|--------|--------|--------------------|--------|
|                                          |   |                   |   |   |                    |   |
| Accrued compensation                          |   | $                 | 12,080 |   |               | $      | 24,601 |   |
| Goods and services received, not yet invoiced |   |              | 3,396  |   |               |   | 4,681 |   |
| Deferred revenue and customer advances        |   |              | 549    |   |               |   | 458 |   |
| Warranty accrual                              |   |              | 271    |   |               |   | 324 |   |
| Income taxes payable                          |   |              | 8,063  |   |               |   | 6,931 |   |
| Taxes, other than income taxes                |   |              | 1,092  |   |               |   | 951 |   |
| Other                                         |   |              | 3,052  |   |               |   | 1,953 |   |
| Total                                         |   | $                 | 28,503 |   |               | $      | 39,899 |   |

----

index

----

index

| Fiscal Year       |   | Principal Repayments |    |
|-------------------|--------|----------------------|---------|
| Remainder of 2014 |   | $                    | 8,751   |   |
| 2015              |   |                 | 15,312  |   |
| 2016              |   |                 | 21,875  |   |
| 2017              |   |                 | 113,750 |   |
| Total             |   | $                    | 159,688 |   |

|                                                                                                                                                                                                                                                                                                                                                                         |                                 | Asset Derivatives               |   | Liability Derivatives            |   |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------|---------------------------------|--------|----------------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                         | Balance Sheet Location                    | Fair Value at December 31, 2013 |   | Fair Value at September 30, 2013 |   | Fair Value at December 31, 2013 |   | Fair Value at September 30, 2013 |   |
| Derivatives not designated as hedging instruments                                                                                                                                                                                                                                                                                                                            |                                      |                            |        |                             |   |  |   |   |  |   |   |  |   |
| Foreign exchange contracts                                                                                                                                                                                                                                                                                                                                                   | Prepaid expenses and other current assets |                            | $      | -                                |   |   | $ | 60 |   |   | $ | - |   |   | $ | - |   |
|                                                      Accrued expenses and other current liabilities |                                      | $                               | -      |                             |   | $ | - |   |   | $ | 122 |   |   | $ | - |   |

|                                              |                         |               |        |              |   |        |   |
|---------------------------------------------------|------------------------------|--------------------|--------|-------------------|--------|--------|--------|
|                                              |                    | Three Months Ended |   |
|                                              | Statement of Income Location | December 31, 2013  |   | December 31, 2012 |   |
| Derivatives not designated as hedging instruments |                         |               |        |              |   |        |   |
| Foreign exchange contracts                        | Other income (expense), net  |               | $      | (392              | )      |   | $      | 241 |   |

----

index

| Balance as of September 30, 2013                         |   | $      | 324  |   |
|----------------------------------------------------------|--------|--------|------|--------|
| Reserve for product warranty during the reporting period |   |   | 181  |   |
| Settlement of warranty                                   |   |   | (234 | )      |
| Balance as of December 31, 2013                          |   | $      | 271  |   |

----

index

|                                               |   | Three Months Ended December 31, |   |
|----------------------------------------------------|--------|---------------------------------|--------|
|                                               |   | 2013                            |   |   | 2012 |   |
|                                               |   |                                 |   |   |  |   |
| Cost of goods sold                                 |   | $                               | 480    |   |   | $ | 512 |   |
| Research, development and technical                |   |                            | 366    |   |   |   | 366 |   |
| Selling and marketing                              |   |                            | 353    |   |   |   | 386 |   |
| General and administrative                         |   |                            | 2,167  |   |   |   | 2,230 |   |
| Total share-based compensation expense             |   |                            | 3,366  |   |   |   | 3,494 |   |
| Tax benefit                                        |   |                            | (1,092 | ) |   |   | (1,186 | ) |
| Total share-based compensation expense, net of tax |   | $                               | 2,274  |   |   | $ | 2,308 |   |

----

index

|                    |   | Three Months Ended December 31, |   |
|-------------------------|--------|---------------------------------|--------|
|                    |   | 2013                            |   |   | 2012 |   |
|                    |   |                                 |   |   |  |   |
| Interest income         |   | $                               | 58     |   |   | $ | 45 |   |
| Other income (expense)  |   |                            | 559    |   |   |   | 809 |   |
| Total other income, net |   | $                               | 617    |   |   | $ | 854 |   |

----

index

|                                                  |   | Three Months Ended December 31, |       |
|-------------------------------------------------------|--------|---------------------------------|------------|
|                                                  |   | 2013                            |       |   | 2012 |   |
| Numerator:                                            |   |                                 |       |   |  |   |
| Net income                                            |   |                            | 11,308     |   |   |   | 9,703 |   |
| Less: income attributable to participating securities |   |                            | (127       | ) |   |   | - |   |
| Earnings available to common shares                   |   | $                               | $ 11,181   |   |   | $ | $ 9,703 |   |
|                                                  |   |                            |       |   |   |   |   |   |
| Denominator:                                          |   |                            |       |   |   |   |   |   |
| Weighted average common shares                        |   |                            | 23,589,627 |   |   |   | 22,844,896 |   |
| (Denominator for basic calculation)                   |   |                            |       |   |   |   |   |   |
|                                                  |   |                            |       |   |   |   |   |   |
| Weighted average effect of dilutive securities:       |   |                            |       |   |   |   |   |   |
| Share-based compensation                              |   |                            | 1,033,333  |   |   |   | 812,734 |   |
| Diluted weighted average common shares                |   |                            | 24,622,960 |   |   |   | 23,657,630 |   |
| (Denominator for diluted calculation)                 |   |                            |       |   |   |   |   |   |
|                                                  |   |                            |       |   |   |   |   |   |
| Earnings per share:                                   |   |                            |       |   |   |   |   |   |
|                                                  |   |                            |       |   |   |   |   |   |
| Basic                                                 |   | $                               | $ 0.47     |   |   | $ | $ 0.42 |   |
|                                                  |   |                            |       |   |   |   |   |   |
| Diluted                                               |   | $                               | $ 0.45     |   |   | $ | $ 0.41 |   |

|                        |   | Three Months Ended December 31, |    |
|-----------------------------|--------|---------------------------------|---------|
| Revenue:                    |   | 2013                            |    |   | 2012 |   |
| Tungsten slurries           |   | $                               | 37,369  |   |   | $ | 40,706 |   |
| Dielectric slurries         |   |                            | 29,946  |   |   |   | 30,358 |   |
| Other Metals slurries       |   |                            | 17,805  |   |   |   | 17,984 |   |
| Polishing pads              |   |                            | 7,410   |   |   |   | 8,464 |   |
| Data storage slurries       |   |                            | 4,982   |   |   |   | 5,062 |   |
| Engineered Surface Finishes |   |                            | 3,003   |   |   |   | 3,959 |   |
| Total revenue               |   | $                               | 100,515 |   |   | $ | 106,533 |   |

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| · | Research related to fundamental CMP technology; |
|--------|-------------------------------------------------|

| · | Development and formulation of new and enhanced CMP consumables products, including collaboration on joint development projects with our customers; |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------|

| · | Process development to support rapid and effective commercialization of new products; |
|--------|---------------------------------------------------------------------------------------|

| · | Technical support of CMP products in our customers' research, development and manufacturing facilities; and, |
|--------|--------------------------------------------------------------------------------------------------------------|

| · | Evaluation and development of new polishing and metrology applications outside of the semiconductor industry. |
|--------|---------------------------------------------------------------------------------------------------------------|

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| CONTRACTUAL OBLIGATIONS                     |   |        |   |   | Less Than |   |   |  1-3 |   |   |  3-5 |   |   | After 5 |   |
|---------------------------------------------|--------|--------|--------|--------|-----------|--------|--------|-----------|--------|--------|-----------|--------|--------|---------|--------|
| (In millions)                               |   | Total  |   |   | 1 Year    |   |   | Years     |   |   | Years     |   |   | Years   |   |
|                                        |   |        |   |   |           |   |   |      |   |   |      |   |   |    |   |  |   |
| Long-term debt                              |   | $      | 159.7  |   |      | $      | 12.0   |      |   | $      | 33.9      |   |   | $       | 113.8  |   |   | $ | - |   |
| Interest expense and fees on long-term debt |   |   | 8.4    |   |      |   | 3.2    |      |   |   | 4.8       |   |   |    | 0.4    |   |   |   | - |   |
| Purchase obligations                        |   |   | 124.9  |   |      |   | 58.2   |      |   |   | 66.1      |   |   |    | 0.3    |   |   |   | 0.3 |   |
| Operating leases                            |   |   | 7.9    |   |      |   | 3.0    |      |   |   | 3.5       |   |   |    | 1.0    |   |   |   | 0.4 |   |
| Other long-term liabilities *               |   |   | 7.7    |   |      |   | -      |      |   |   | -         |   |   |    | -      |   |   |   | 7.7 |   |
| Total contractual obligations               |   | $      | 308.6  |   |      | $      | 76.4   |      |   | $      | 108.3     |   |   | $       | 115.5  |   |   | $ | 8.4 |   |

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| Period                      |   | Total Number of Shares Purchased |    |   | Average Price Paid Per Share |   |   | Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs |   |   | Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (in thousands) |   |
|-----------------------------|--------|----------------------------------|---------|--------|------------------------------|--------|--------|----------------------------------------------------------------------------------|--------|--------|---------------------------------------------------------------------------------------------------------|--------|
| Oct. 1 throughOct. 31, 2013 |   |                             | 6,000   |   |                         | $      | 40.98  |                                                                             |   |   | 6,000                                                                                                   |   |   | $ | 89,754 |   |
| Nov. 1 throughNov. 30, 2013 |   |                             | 162,000 |   |                         | $      | 43.23  |                                                                             |   |   | 162,000                                                                                                 |   |   | $ | 82,750 |   |
| Dec. 1 throughDec. 31, 2013 |   |                             | 63,285  |   |                         | $      | 44.59  |                                                                             |   |   | 16,788                                                                                                  |   |   | $ | 82,000 |   |
|   Total           |   |                             | 231,285 |   |                         | $      | 43.55  |                                                                             |   |   | 184,788                                                                                                 |   |   | $ | 82,000 |   |

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| ExhibitNumber |  Description                                                                                                                                                                               |
|---------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 31.1          | Certification of Chief Executive Officer pursuant to Rule 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. |
|          |                                                                                                                                                                                            |
| 31.2          | Certification of Chief Financial Officer pursuant to Rule 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. |
|          |                                                                                                                                                                                            |
| 32.1          | Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.                                                                         |

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|                   |   | CABOT MICROELECTRONICS CORPORATION                   |   |
|------------------------|--------|------------------------------------------------------|--------|
|                   |   | [Registrant]                                         |   |
|                   |   |                                                 |   |
| Date: February 7, 2014 | By:    | /s/ WILLIAM S. JOHNSON                               |   |
|                   |   | William S. Johnson                                   |   |
|                   |   | Executive Vice President and Chief Financial Officer |   |
|                   |   | [Principal Financial Officer]                        |   |
|                   |   |                                                 |   |
|                   |   |                                                 |   |
| Date: February 7, 2014 | By:    | /s/ THOMAS S. ROMAN                                  |   |
|                   |   | Thomas S. Roman                                      |   |
|                   |   | Corporate Controller                                 |   |
|                   |   | [Principal Accounting Officer]                       |   |