| **UNITED                STATES****SECURITIES                AND EXCHANGE COMMISSION**                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Washington,                D.C. 20549                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| **FORM                10-Q**                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| (MARK                ONE)                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| (x)                Quarterly Report Pursuant to Section 13 or 15(d) of the Securities                Exchange Act of 1934                                                                                                                                                                                                                                                                                                                                                        |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| **For                the quarterly period ended September 30, 2006**                                                                                                                                                                                                                                                                                                                                                                                                             |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| or                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| (                )                Transition Report Pursuant to Section 13 or 15(d) of the Securities                and                Exchange Act of 1934 (No Fee Required)                                                                                                                                                                                                                                                                                                   |
| **Commission                File No. 0-12718**                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| **SUPERTEX,                INC.**                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| (Exact                name of Registrant as specified in its Charter)                                                                                                                                                                                                                                                                                                                                                                                                            |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| **California**                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | **94-2328535** |
| (State                or other jurisdiction of incorporation or organization)                                                                                                                                                                                                                                                                                                                                                                                                    | (IRS                Employer Identification #) |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| **1235                Bordeaux Drive**                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| **Sunnyvale,                California 94089**                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| (Address                of principal executive offices)                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Registrant's                Telephone Number, Including Area Code: **(408)                222-8888**                                                                                                                                                                                                                                                                                                                                                                             |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Indicate                by check mark whether the Registrant (1) has filed all reports required                to                be filed by Section 13 or 15(d) of the Securities Exchange Act of                1934                during the preceding 12 months (or for such shorter period that the                Registrant was required to file such reports), and (2) has been subject                to                such filing requirements for the past 90 days. |
| **Yes                [ X ]**                                                                                                                                                                                                                                                                                                                                                                                                                                                     | **No                [ ]** |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Indicate                by check mark whether the registrant is an accelerated filer (as                defined                in Rule 12b-2 of the Act). Check one. **Large                accelerated filer [ ]                       Accelerated filer [ X ]                      Non-accelerated filer [ ]**                                                                                           |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Indicate                by check mark whether the registrant is a shell company (as defined                in                Rule 12b-2 of the Act).**Yes                [                ]                                        No [ X ]**                                                                                                            |
| Indicate                the number of shares outstanding of each of the issuer’s classes of common                stock, as of the latest practicable date.                                                                                                                                                                                                                                                                                                                |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Class                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | Outstanding                at November 2, 2006 |
| Common                Stock, no par value                                                                                                                                                                                                                                                                                                                                                                                                                                        | 13,729,030 |
| *Exhibit                index is on Page 30*                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| *Total                number of pages: 35*                                                                                                                                                                                                                                                                                                                                                                                                                                       |

----

**SUPERTEX,      INC.**

**QUARTERLY      REPORT - FORM 10Q**

| Table                of Contents |                                                                                                                      | Page                No. |
|----------------------------------|---------------------------------------------------------------------------------------------------------------------------|-------------------------|
|                             | PART                I - FINANCIAL INFORMATION                                                                             |                    |
| Item                1.           | Financial                Statements (Unaudited)                                                                           |                    |
|                             | Condensed                Consolidated Statements of Income                                                                | 3                       |
|                             | Condensed                Consolidated Balance Sheets                                                                      | 4                       |
|                             | Condensed                Consolidated Statements of Cash Flows                                                            | 5                       |
|                             | Notes                to Condensed Consolidated Financial Statements                                                       | 6                       |
| Item                2.           | Management’s                Discussion and Analysis of Financial Condition and Results of                Operations | 18                      |
| Item                3.           | Quantitative                and Qualitative Disclosures About Market Risk                                                 | 27                      |
| Item                4.           | Controls                and Procedures                                                                                    | 28                      |
|                             |                                                                                                                      |                    |
|                             | PART                II - OTHER INFORMATION                                                                                |                    |
| Item                1.           | Legal                Proceedings                                                                                          | 29                      |
| Item                1A.          | Risk                Factors                                                                                               | 29                      |
| Item                2.           | Unregistered                Sales of Equity Securities and Use of Proceeds                                                | 29                      |
| Item                3.           | Defaults                Upon Senior Securities                                                                            | 29                      |
| Item                4.           | Submission                of Matters to a Vote of Security Holders                                                        | 30                      |
| Item                5.           | Other                Information                                                                                          | 30                      |
| Item                6.           | Exhibits                                                                                                                  | 30                      |
|                             |                                                                                                                      |                    |
| Signature                        |                                                                                                                      | 31                      |

----

**PART      I - FINANCIAL INFORMATION**

**Item      1. Financial Statements**

**SUPERTEX,      INC.**

**CONDENSED      CONSOLIDATED STATEMENTS OF INCOME**

*(unaudited)*

*(in      thousands, except per share amounts)*

|                                                                                                                                                                     |   | **Three                Months Ended**  | **Six                Months Ended**                                      |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------------------|--------------------------------------------------------------------------|
|                                                                                                                                                                     |   |                                        | **     September                30, 2006** |   |   | **October                1, 2005** |   |   | **September                30, 2006** |   |   | **October                1, 2005** |   |
|  Net                sales                                                                                                                                                |   | $                                           | 26,521                                                                   |   | $ | 20,226 |   | $ | 51,086 |   | $ | 36,219 |   |
|  Cost                of sales(1)                                                                                                                                         |   |                                        | 10,305                                                                   |   |   | 8,844 |   |   | 20,142 |   |   | 15,650 |   |
|  Gross                profit                                                                                                                                             |   |                                        | 16,216                                                                   |   |   | 11,382 |   |   | 30,944 |   |   | 20,569 |   |
|  Research                and development(1)                                                                                                                              |   |                                        | 3,658                                                                    |   |   | 2,598 |   |   | 7,607 |   |   | 5,357 |   |
|  Selling,                general and administrative(1)                                                                                                                   |   |                                        | 3,826                                                                    |   |   | 3,248 |   |   | 7,629 |   |   | 6,436 |   |
|  Total                operating expenses                                                                                                                                 |   |                                        | 7,484                                                                    |   |   | 5,846 |   |   | 15,236 |   |   | 11,793 |   |
|  Income                from operations                                                                                                                                   |   |                                        | 8,732                                                                    |   |   | 5,536 |   |   | 15,708 |   |   | 8,776 |   |
|  Interest                income                                                                                                                                          |   |                                        | 1,202                                                                    |   |   | 632 |   |   | 2,313 |   |   | 1,259 |   |
|  Other                income and expense, net                                                                                                                            |   |                                        | (234                                                                     | ) |   | 70 |   |   | (57 | ) |   | 349 |   |
|  Income                before provision for income taxes                                                                                                                 |   |                                        | 9,700                                                                    |   |   | 6,238 |   |   | 17,964 |   |   | 10,384 |   |
|  Provision                for income taxes                                                                                                                               |   |                                        | 3,704                                                                    |   |   | 1,991 |   |   | 7,052 |   |   | 3,318 |   |
|  Net                income                                                                                                                                               |   | $                                           | 5,996                                                                    |   | $ | 4,247 |   | $ | 10,912 |   | $ | 7,066 |   |
|  Net                income per share:                                                                                                                                    |   |                                        |                                                                     |   |   |   |   |   |   |   |   |   |   |
|  Basic                                                                                                                                                                   |   | $                                           | 0.44                                                                     |   | $ | 0.32 |   | $ | 0.80 |   | $ | 0.54 |   |
|  Diluted                                                                                                                                                                 |   | $                                           | 0.43                                                                     |   | $ | 0.31 |   | $ | 0.78 |   | $ | 0.53 |   |
|                                                                                                                                                                          |   |                                        |                                                                     |   |   |   |   |   |   |
| Shares                used in per share computation:                                                                                                                          |   |                                        |                                                                     |   |   |   |   |   |   |
|  Basic                                                                                                                                                                   |   |                                        | 13,671                                                                   |   |   | 13,180 |   |   | 13,658 |   |   | 13,129 |   |
|  Diluted                                                                                                                                                                 |   |                                        | 13,989                                                                   |   |   | 13,628 |   |   | 14,000 |   |   | 13,422 |   |
|                                                                                                                                                                          |   |                                        |                                                                     |   |   |   |   |   |   |   |   |   |   |
|  (1)                Includes                amortization of employee stock-based compensation as follows. See                Note 2                for more information: |   |                                        | FAS123R                                                                  |   |   | APB25 |   |   | FAS123R |   |   | APB25 |   |
|  Cost                of sales                                                                                                                                            |   | $                                           | 92                                                                       |   | $ | -- |   | $ | 157 |   | $ | -- |   |
|  Research                and development                                                                                                                                 |   | $                                           | 396                                                                      |   | $ | -- |   | $ | 783 |   | $ | -- |   |
|  Selling,                general and administrative                                                                                                                      |   | $                                           | 163                                                                      |   | $ | -- |   | $ | 359 |   | $ | -- |   |

*See      accompanying Notes to Unaudited Condensed Consolidated Financial      Statements.*

----

**SUPERTEX,      INC.**

**CONDENSED      CONSOLIDATED BALANCE SHEETS**

*(unaudited,      in thousands)*

|                                                                                                                                 |   |   | **September                30, 2006**  |   |   | **April                1, 2006** |   |
|--------------------------------------------------------------------------------------------------------------------------------------|--------|--------|---------------------------------------------|--------|--------|----------------------------------|--------|
| **ASSETS**                                                                                                                           |   |   |                                        |   |   |                             |   |
| Current                assets:                                                                                                       |   |   |                                        |   |   |                             |   |
| Cash                and cash equivalents                                                                                             |   | $      | 20,859                                      |   | $      | 27,654                           |   |
|                            Short-term investments                             |   |   | 102,446                                     |   |   | 82,992                           |   |
| Trade                accounts receivable, net of allowances of $623 and $672                                                         |   |   | 16,133                                      |   |   | 14,824                           |   |
| Inventories                                                                                                                          |   |   | 12,813                                      |   |   | 12,543                           |   |
| Prepaid                expenses and other current assets                                                                             |   |   | 1,811                                       |   |   | 1,358                            |   |
| Deferred                income taxes                                                                                                 |   |   | 7,781                                       |   |   | 7,781                            |   |
|                      Total                current assets                                                    |   |   | 161,843                                     |   |   | 147,152                          |   |
| Property,                plant and equipment, net                                                                                    |   |   | 8,670                                       |   |   | 8,048                            |   |
| Other                assets                                                                                                          |   |   | 144                                         |   |   | 141                              |   |
| Deferred                income taxes                                                                                                 |   |   | 792                                         |   |   | 792                              |   |
| **TOTAL                ASSETS**                                                                                                      |   | $      | 171,449                                     |   | $      | 156,133                          |   |
|                                                                                                                                 |   |   |                                        |   |   |                             |   |
| **LIABILITIES                AND SHAREHOLDERS' EQUITY**                                                                              |   |   |                                        |   |   |                             |   |
| Current                liabilities:                                                                                                  |   |   |                                        |   |   |                             |   |
| Trade                accounts payable                                                                                                |   | $      | 4,460                                       |   | $      | 3,725                            |   |
| Accrued                salaries and employee benefits                                                                                |   |   | 10,614                                      |   |   | 11,227                           |   |
| Other                accrued liabilities                                                                                             |   |   | 1,653                                       |   |   | 1,498                            |   |
| Deferred                revenue                                                                                                      |   |   | 4,381                                       |   |   | 3,566                            |   |
| Income                taxes payable                                                                                                  |   |   | 3,090                                       |   |   | 2,693                            |   |
|                      Total                current liabilities                                               |   |   | 24,198                                      |   |   | 22,709                           |   |
| Commitments                and contingencies (See Note 7)                                                                            |   |   |                                        |   |   |                             |   |
|                                                                                                                                 |   |   |                                        |   |   |                             |   |
| Shareholders’                equity:                                                                                           |   |   |                                        |   |   |                             |   |
| Preferred                stock, no par value - 10,000 shares authorized, none                outstanding                             |   |   | --                                          |   |   | --                               |   |
| Common                stock, no par value - 30,000 shares authorized; issued and outstanding                13,682 and 13,608 shares |   |   | 50,594                                      |   |   | 46,692                           |   |
| Retained                earnings                                                                                                     |   |   | 96,657                                      |   |   | 86,732                           |   |
|                      Total                shareholders' equity                                              |   |   | 147,251                                     |   |   | 133,424                          |   |
| **        TOTAL                LIABILITIES AND SHAREHOLDERS' EQUITY**                        |   | $      | 171,449                                     |   | $      | 156,133                          |   |
|                                                                                                                                 |   |   |                                        |
| *See                accompanying Notes to Unaudited Condensed Consolidated Financial                Statements*.                     |   |   |                                        |

----

**SUPERTEX,      INC.**

**CONDENSED      CONSOLIDATED STATEMENTS OF CASH FLOWS**

*(unaudited,      in thousands)*

|                                                                                                             |   | **Six                Months Ended,**  |
|------------------------------------------------------------------------------------------------------------------|--------|--------------------------------------------|
|                    CASH FLOWS FROM OPERATING ACTIVITIES                                           |   |                                       | **September                30, 2006** |   |   | **October                1, 2005** |   |
| Net                income                                                                                        |   | $                                          | 10,912 |   | $ | 7,066 |   |
| Non-cash                adjustments to net income:                                                               |   |                                       |   |   |   |   |   |
| Depreciation                                                                                                     |   |                                       | 1,340 |   |   | 1,391 |   |
| Provision                for doubtful accounts and sales returns                                                 |   |                                       | 575 |   |   | 574 |   |
| Provision                for excess and obsolete inventories                                                     |   |                                       | 1,189 |   |   | 702 |   |
| Stock-based                compensation expense                                                                  |   |                                       | 1,378 |   |   | -- |   |
| Tax                benefit related to stock-based compensation plans                                             |   |                                       | 526 |   |   | 873 |   |
| Excess                tax benefit related to stock-based compensation plans                                      |   |                                       | (292 | ) |   | -- |   |
| Changes                in operating assets and liabilities:                                                      |   |                                       |   |   |   |   |   |
|                        Short-term investments, categorized as trading         |   |                                       | 745 |   |   | (437 | ) |
|                        Trade accounts receivable                              |   |                                       | (1,884 | ) |   | (4,141 | ) |
|         Inventories                                                      |   |                                       | (1,459 | ) |   | (1,884 | ) |
|                        Prepaid expenses and other assets                      |   |                                       | (456 | ) |   | 37 |   |
|                        Trade accounts payable and accrued expenses            |   |                                       | 277 |   |   | 2,258 |   |
|                        Deferred revenue                                       |   |                                       | 815 |   |   | (486 | ) |
|                        Income taxes payable                                   |   |                                       | 397 |   |   | 34 |   |
| Net                cash provided by operating activities                                                         |   |                                       | 14,063 |   |   | 5,987 |   |
| CASH                FLOWS FROM INVESTING ACTIVITIES                                                              |   |                                       |   |   |   |   |   |
|                  Purchases of property, plant and equipment                                                 |   |                                       | (1,968 | ) |   | (973 | ) |
|                  Purchases of short-term investments, categorized as available for                sale      |   |                                       | (487,990 | ) |   | (370,500 | ) |
|                  Sales of short-term investments, categorized as available for                sale          |   |                                       | 467,791 |   |   | 346,799 |   |
| Net                cash used in investing activities                                                             |   |                                       | (22,167 | ) |   | (24,674 | ) |
| CASH                FLOWS FROM FINANCING ACTIVITIES                                                              |   |                                       |   |   |   |   |   |
|                  Proceeds from exercise of stock options and employee stock purchase                plan    |   |                                       | 2,124 |   |   | 3,511 |   |
|                  Repurchase of common stock                                                                 |   |                                       | (1,107 | ) |   | (1,080 | ) |
|                  Excess tax benefit related to stock-based compensation plans                               |   |                                       | 292 |   |   | -- |   |
| Net                cash provided by financing activities                                                         |   |                                       | 1,309 |   |   | 2,431 |   |
|  NET                DECREASE IN CASH AND CASH EQUIVALENTS                                                   |   |                                       | (6,795 | ) |   | (16,256 | ) |
| CASH                AND CASH EQUIVALENTS:                                                                        |   |                                       |   |   |   |   |   |
| Beginning                of period                                                                               |   |                                       | 27,654 |   |   | 38,634 |   |
| End                of period                                                                                     |   | $                                          | 20,859 |   | $ | 22,378 |   |
| Supplemental                cash flow disclosures:                                                               |   |                                       |   |   |   |   |   |
| Income                taxes paid, net of refunds                                                                 |   | $                                          | 6,360 |   | $ | 2,411 |   |
|                                                                                                             |   |                                       |   |
| *See                accompanying Notes to Unaudited Condensed Consolidated Financial                Statements.* |   |                                       |   |

----

**SUPERTEX,      INC.**

**NOTES        TO CONDENSED CONSOLIDATED FINANCIAL        STATEMENTS**

**(unaudited)**

**Note      1 - Organization and Basis of Presentation**

**Note      2 - Stock-Based Compensation**

----

**SUPERTEX,          INC.**

**NOTES          TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -          (CONTINUED)**

**(unaudited)**

***Prior      to the Adoption of SFAS 123R.***

*,      “Accounting for Stock-Based Compensation - Transition and      Disclosures”.*

*in      thousands, except per share data*

|                                                                                                                                                         |   | **Three                Months Ended****October                1, 2005** |   | **Six                Months Ended****October                1, 2005** |   |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------------------------------------------------------------|--------|-----------------------------------------------------------------------|--------|
| Net                income - as reported                                                                                                                      |   | $                                                                       | 4,247  |                                                                  | $      | 7,066 |   |
| Stock-based                employee compensation expense determined under fair value based method                related to stock options                    |   |                                                                    | (458   | )                                                                     |   | (804 | ) |
| Stock-based                employee compensation expense determined under fair value based method                related to the employee stock purchase plan |   |                                                                    | (46    | )                                                                     |   | (96 | ) |
| Net                income - pro forma                                                                                                                        |   | $                                                                       | 3,743  |                                                                  | $      | 6,166 |   |
| Net                earnings per share - basic:                                                                                                               |   |                                                                    |   |                                                                  |   |   |   |
| As                reported                                                                                                                                   |   | $                                                                       | 0.32   |                                                                  | $      | 0.54 |   |
| Pro                forma                                                                                                                                     |   | $                                                                       | 0.28   |                                                                  | $      | 0.47 |   |
| Net                earnings per share - diluted                                                                                                              |   |                                                                    |   |                                                                  |   |   |   |
| As                reported                                                                                                                                   |   | $                                                                       | 0.31   |                                                                  | $      | 0.53 |   |
| Pro                forma                                                                                                                                     |   | $                                                                       | 0.28   |                                                                  | $      | 0.47 |   |

***Impact      of the Adoption of SFAS 123R.***

*(in      thousands, except per share data)*

|                                                          |   | **Three                Months Ended****September                30, 2006** |   | **Six                Months Ended****September                30, 2006** |    |
|---------------------------------------------------------------|--------|----------------------------------------------------------------------------|--------|--------------------------------------------------------------------------|---------|
| Stock-based                compensation expense               |   | $                                                                          | 651    |                                                                     | $       | 1,299 |   |
| Tax                effect of stock-based compensation expense |   |                                                                       | 31     |                                                                     |    | (17 | ) |
| Net                effect on net income                       |   | $                                                                          | 682    |                                                                     | $       | 1,282 |   |
| Tax                effect on:                                 |   |                                                                       |   |                                                                     |    |   |   |
| Cash                flows from operating activities           |   | $                                                                          | (59    | )                                                                        | $       | (292 | ) |
| Cash                flows from financing activities           |   | $                                                                          | 59     |                                                                     | $  | 292 |   |
| Effect                on earnings per share:                  |   |                                                                       |   |                                                                     |    |   |   |
| Basic                                                         |   | $                                                                          | 0.05   |                                                                     | $       | 0.09 |   |
| Diluted                                                       |   | $                                                                          | 0.05   |                                                                     | $       | 0.09 |   |

----

**SUPERTEX,            INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -            (CONTINUED)**

**(unaudited)**

***Valuation      Assumptions***

----

**SUPERTEX,          INC.**

**NOTES          TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -          (CONTINUED)**

**(unaudited)**

|                                          |   | **Three                Months Ended**                                                                                                                                                       |   | **Six                Months Ended** |   |
|-----------------------------------------------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------------------------|--------|
|                                          |   | **                         September                30, 2006** |   | **October                1, 2005**  |   | **                          September 30, 2006  ** |   | **October                1, 2005** |   |
|                                          |   | **D&O**                                                                                                                                                                                 |   | **All                Others**       |   | **D&O                and All Others** |   | **D&O** |   | **All                Others** |   | **D&O                and All Others** |   |
| Expected                term (years)          |   |                                                                                                                                                                                        | 5.75   |                                |   | 4.50 |   |   | 4.66 |   |   | 5.75 |   |   | 4.50 |   |   | 4.62 |   |
| Stock                volatility               |   |                                                                                                                                                                                        | 54.0   | %                                   |   | 49.0 | % |   | 47.0 | % |   | 56.0 | % |   | 51.5 | % |   | 48.93 | % |
| Risk                free interest rates       |   |                                                                                                                                                                                        | 4.85   | %                                   |   | 4.84 | % |   | 3.80 | % |   | 4.95 | % |   | 5.00 | % |   | 3.65 | % |
| Dividends                during expected term |   |                                                                                                                                                                                        | 0.0    | %                                   |   | 0.0 | % |   | 0.0 | % |   | 0.0 | % |   | 0.0 | % |   | 0.0 | % |
| Forfeiture                rate                |   |                                                                                                                                                                                        | 3.9    | %                                   |   | 9.6 | % |   | 0.0 | % |   | 4.0 | % |   | 9.8 | % |   | 0.0 | % |

*Expected      Term*

*Expected      stock volatility*

*Risk-free      interest rate*

*Dividends      yield*

*Forfeiture      rate*

----

**SUPERTEX,          INC.**

**NOTES          TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -          (CONTINUED)**

**(unaudited)**

|                                        |   |                                      |      | **Options                Outstanding** |   |
|---------------------------------------------|--------|-------------------------------------------|-----------|----------------------------------------|--------|
|                                        |   | **Available                For****Grant** |      |  ** ****Shares**             |   | **Weighted                Average****Exercise                Price** |   |
| Balance,                April 3, 2004       |   |                                      | 1,478,949 |                                   |   | 1,479,830 |   | $ | 16.67 |   |
|                    Granted   |   |                                      | (205,600  | )                                      |   | 205,600 |   |   | 17.94 |   |
|                    Exercised |   |                                      | --        |                                   |   | (183,130 | ) |   | 12.72 |   |
|     Canceled            |   |                                      | 63,120    |                                   |   | (63,120 | ) |   | 18.04 |   |
|                    Expired   |   |                                      | (14,560   | )                                      |   | -- |   |   |   |   |
| Balance,                April 2, 2005       |   |                                      | 1,321,909 |                                   |   | 1,439,180 |   | $ | 17.56 |   |
|                    Granted   |   |                                      | (342,800  | )                                      |   | 342,800 |   |   | 30.71 |   |
|                    Exercised |   |                                      | --        |                                   |   | (552,801 | ) |   | 14.99 |   |
|                    Canceled  |   |                                      | 111,960   |                                   |   | (111,960 | ) |   | 18.64 |   |
|                    Expired   |   |                                      | (39,400   | )                                      |   | -- |   |   |   |   |
| Balance,                April 1, 2006       |   |                                      | 1,051,669 |                                   |   | 1,117,219 |   | $ | 22.93 |   |
|                    Granted   |   |                                      | (79,300   | )                                      |   | 79,300 |   |   | 40.56 |   |
|                    Exercised |   |                                      | --        |                                   |   | (91,655 | ) |   | 17.34 |   |
|                    Canceled  |   |                                      | 39,340    |                                   |   | (39,340 | ) |   | 34.02 |   |
|                    Expired   |   |                                      | --        |                                   |   | -- |   |   |   |   |
| Balance,                September 30, 2006  |   |                                      | 1,011,709 |                                   |   | 1,065,524 |   | $ | 24.11 |   |

|                                              |   | **Options                Outstanding**  |   | **Options                Exercisable**                                    |
|---------------------------------------------------|--------|----------------------------------------------|--------|---------------------------------------------------------------------------|
|  **Range                of Exercise Prices** |   |  **Number                Outstanding**  |   | **Weighted-Average                Remaining Contractual Life****(Years)** |   |  **Weighted-Average                Exercise Price** |   |  **Number                Outstanding** |   |  **Weighted-Average                Exercise Price** |
| $10.75                - $15.83                    |   | 228,925                                      |   | 1.93                                                                      |   | $12.87 |   | 181,025 |   | $12.90 |
| 17.06                - 18.52                      |   | 346,840                                      |   | 4.50                                                                      |   | 17.31 |   | 86,480 |   | 17.30 |
| 19.37                - 29.00                      |   | 123,009                                      |   | 3.91                                                                      |   | 23.31 |   | 50,949 |   | 22.50 |
| 33.67                - 46.34                      |   | 366,450                                      |   | 5.23                                                                      |   | 37.85 |   | 82,750 |   | 46.34 |
| $                10.75 - $46.34                   |   | 1,065,524                                    |   | 4.13                                                                      |   | $24.11 |   | 401,204 |   | $21.97 |

----

**SUPERTEX,            INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -            (CONTINUED)**

**(unaudited)**

***Employee      Stock Purchase Plan (“ESPP”).***
* *

**Note      3 - Inventories**

*(in      thousands)*

|                          |   | **September                30, 2006** |   | **April                1, 2006** |   |
|-------------------------------|--------|---------------------------------------|--------|----------------------------------|--------|
| Raw                materials  |   | $                                     | 1,454  |                             | $      | 1,214 |   |
| Work-in-process               |   |                                  | 7,741  |                             |   | 7,644 |   |
| Finished                goods |   |                                  | 3,618  |                             |   | 3,685 |   |
| Inventories                   |   | $                                     | 12,813 |                             | $      | 12,543 |   |

**Note      4 - Comprehensive Income **

----

**SUPERTEX,          INC.**

**NOTES          TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -          (CONTINUED)**

**(unaudited)**

**Note      5 - Income Taxes**

*“Transition      Election Related to Accounting for Tax Effects of Share-Based Payment      Awards.”*

**Note      6 - Net Income per Share **

*in      thousands, except per share amounts*

----

**SUPERTEX,          INC.**

**NOTES          TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -          (CONTINUED)**

**(unaudited)**

|                                                              |   | **Three                Months Ended** |   | **Six                Months Ended** |   |
|-------------------------------------------------------------------|--------|---------------------------------------|--------|-------------------------------------|--------|
|                                                              |   | **September                30, 2006** |   | **October                1, 2005**  |   | **September                30, 2006** |   | **October                1, 2005** |   |
| BASIC:                                                            |   |                                  |   |                                |   |   |   |   |   |
| Net                income                                         |   | $                                     | 5,996  |                                | $      | 4,247 |   | $ | 10,912 |   | $ | 7,066 |   |
| Weighted                average shares outstanding for the period |   |                                  | 13,671 |                                |   | 13,180 |   |   | 13,658 |   |   | 13,129 |   |
| Net                income per share                               |   | $                                     | 0.44   |                                | $      | 0.32 |   | $ | 0.80 |   | $ | 0.54 |   |
|                                                              |   |                                  |   |                                |   |   |   |   |   |   |   |   |   |
| DILUTED:                                                          |   |                                  |   |                                |   |   |   |   |   |   |   |   |   |
| Net                income                                         |   | $                                     | 5,996  |                                | $      | 4,247 |   | $ | 10,912 |   | $ | 7,066 |   |
| Weighted                average shares outstanding for the period |   |                                  | 13,671 |                                |   | 13,180 |   |   | 13,658 |   |   | 13,129 |   |
| Dilutive                effect of stock options                   |   |                                  | 318    |                                |   | 448 |   |   | 341 |   |   | 293 |   |
| Total                                                             |   |                                  | 13,989 |                                |   | 13,628 |   |   | 14,000 |   |   | 13,422 |   |
| Net                income per share                               |   | $                                     | 0.43   |                                | $      | 0.31 |   | $ | 0.78 |   | $ | 0.53 |   |

**Note      7 - Commitments and Contingencies**

*Guarantor’s      Accounting and Disclosure Requirements for Guarantees, Including Indirect      Guarantees of Indebtedness of Others,*

***Indemnification***

----

**                                    SUPERTEX, INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -            (CONTINUED)**

**(unaudited)**

***Legal      Proceedings***

***Product      Warranty***

*(in      thousands)*

| **Description**                                      |   | **Balance                at Beginning of Period** |   | **Additions****(1)** |   | **Deductions****(2)** |   | **Balance                at End of Period** |   |
|------------------------------------------------------|--------|---------------------------------------------------|--------|----------------------|--------|-----------------------|--------|---------------------------------------------|--------|
| Three                months ended September 30, 2006 |   |                                              |   |                 |   |                  |   |                                        |   |   |   |   |   |
| Allowance                for sales returns           |   | $                                                 | 462    |                 | $      | 523                   |   | $                                           | 488    |   | $ | 497 |   |
|                                                 |   |                                              |   |                 |   |                  |   |                                        |   |   |   |   |   |
| Three                months ended October 1, 2005    |   |                                              |   |                 |   |                  |   |                                        |   |   |   |   |   |
| Allowance                for sales returns           |   | $                                                 | 490    |                 | $      | 205                   |   | $                                           | 201    |   | $ | 494 |   |
|                                                 |   |                                              |   |                 |   |                  |   |                                        |   |   |   |   |   |
| Six                months ended September 30, 2006   |   |                                              |   |                 |   |                  |   |                                        |   |   |   |   |   |
| Allowance                for sales returns           |   | $                                                 | 525    |                 | $      | 676                   |   | $                                           | 704    |   | $ | 497 |   |
|                                                 |   |                                              |   |                 |   |                  |   |                                        |   |   |   |   |   |
| Six                months ended October 1, 2005      |   | $                                                 | 463    |                 | $      | 560                   |   | $                                           | 529    |   | $ | 494 |   |
| Allowance                for sales returns           |   |                                              |   |                 |   |                  |   |                                        |   |   |   |   |   |

*(1)      *

*Allowances      for sales returns are charged as a reduction to net sales. *

*(2)*

*      Represents amounts written off against the allowance for sales      returns.*

----

**SUPERTEX,          INC.**

**NOTES          TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -          (CONTINUED)**

**(unaudited)**

**Operating      Lease Obligations **

*in      thousands*

| **Payment                Due by Year** |   | **Operating                Lease** |   | **Estimated                Sublease Income** |   |
|----------------------------------------|--------|------------------------------------|--------|----------------------------------------------|--------|
| Less                than 1 year        |   | $                                  | 1,064  |                                         | $      | 293 |   |
| 2                years                 |   |                               | 1,011  |                                         |   | 52 |   |
| 3                years                 |   |                               | 1,034  |                                         |   | -- |   |
| 4                years                 |   |                               | 961    |                                         |   | -- |   |
| 5                years                 |   |                               | 562    |                                         |   | -- |   |
| Thereafter                             |   |                               | --     |                                         |   | -- |   |
|                                   |   | $                                  | 4,632  |                                         | $      | 345 |   |

*** ***
**Note      8 - Common Stock Repurchase**

|                                        |   | **Three                Months Ended** |      | **Six                Months Ended** |   |
|---------------------------------------------|--------|---------------------------------------|-----------|-------------------------------------|--------|
|                                        |   | **September                30, 2006** |      | **October                1, 2005**  |   | **September                30, 2006** |   | **October                1, 2005** |   |
| Number                of shares repurchased |   |                                  | 35,000    |                                |   | -- |   |   | 35,000 |   |   | 67,900 |   |
| Cost                of shares repurchased   |   | $                                     | 1,107,000 |                                |   | -- |   | $ | 1,107,000 |   | $ | 1,080,000 |   |
| Average                price per share      |   | $                                     | 31.62     |                                |   | -- |   | $ | 31.62 |   | $ | 15.91 |   |

**Note      9 - Segment Information**

----

**SUPERTEX,          INC.**

**NOTES          TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -          (CONTINUED)**

**(unaudited)**

*(in      thousands)*

|                                  |   | **Three                Months Ended** |   | **Six                Months Ended** |   |
|---------------------------------------|--------|---------------------------------------|--------|-------------------------------------|--------|
| **Net                Sales**          |   | **September                30, 2006** |   | **October                1, 2005**  |   | **September                30, 2006** |   | **October                1, 2005** |   |
| Asia                (excluding Japan) |   | $                                     | 12,886 |                                | $      | 8,966 |   | $ | 24,953 |   | $ | 13,762 |   |
| United                States          |   |                                  | 7,361  |                                |   | 7,220 |   |   | 14,888 |   |   | 14,570 |   |
| Europe                                |   |                                  | 3,981  |                                |   | 1,831 |   |   | 6,400 |   |   | 3,136 |   |
| Japan                                 |   |                                  | 2,035  |                                |   | 1,718 |   |   | 3,985 |   |   | 3,453 |   |
| Other                                 |   |                                  | 258    |                                |   | 491 |   |   | 860 |   |   | 1,298 |   |
| Net                Sales              |   | $                                     | 26,521 |                                | $      | 20,226 |   | $ | 51,086 |   | $ | 36,219 |   |

*(in      thousands):*

| ** ****Country**        |   | **September                30, 2006** |   | **April                1, 2006** |   |
|------------------------------|--------|---------------------------------------|--------|----------------------------------|--------|
| United                States |   | $                                     | 7,391  |                             | $      | 7,006 |   |
| Hong                Kong     |   |                                  | 1,279  |                             |   | 1,042 |   |
|                         |   | $                                     | 8,670  |                             | $      | 8,048 |   |

**Note      10 - Significant Customers **

**Note      11 - Recent Accounting Pronouncements**

*Considering      the Effects of Prior Year Misstatements when Quantifying Current Year      Misstatements.*

----

**SUPERTEX,            INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -            (CONTINUED)**

**(unaudited)**

*Fair      Value Measurements, *

*Accounting      for Uncertainty in Income Taxes: An Interpretation of FASB Statement No.      109*
*Accounting      for Income Taxes*

----

**Item      2. Management's Discussion and Analysis of Financial Condition and Results      of      Operations**

**Cautionary      Statement Regarding Forward Looking Statements**

*This      quarterly Report on Form 10-Q includes forward-looking statements. These      forward-looking statements are not historical facts, and are based on current      expectations, estimates, and projections about our industry, our beliefs, our      assumptions, and our goals and objectives. Words such as "anticipates,"      "expects," "intends," "plans," "believes," "seeks," and "estimates, " and      variations of these words and similar expressions, are intended to identify      forward-looking statements. Examples of the kinds of forward-looking statements      in this report include statements regarding the following: (1) our belief that      we have substantial production capacity in place to handle any projected      increase in business for the next fiscal year; (2) our expectation that      quarterly R&D spending during the next quarter and remainder of fiscal 2007      is likely to remain at or above the level of our second quarter of fiscal 2007      but that expenses as a percentage of net sales may fluctuate;      (3)*
*the      Company’s belief that it has provided adequate tax reserves to cover any      additional taxes that maybe be assessed in the IRS audit;*
*(4)      that available funds and cash generated from operations will be sufficient      to      meet our working capital and capital expenditure requirements for the next      twelve months; (5) that we expect to spend approximately $2.3 million for      capital acquisitions in the second half of fiscal year 2007; (6) our belief      that      the medical ultrasound machine market will continue to grow globally in fiscal      2007 and beyond and that we will be a key component supplier with our increasing      sales of high voltage analog switches and multiplexers, high voltage pulser      ICs,      high-speed MOSFET drivers, and discrete high voltage FETs; (7) our belief that      our sales to the Medical Electronics market will increase during fiscal 2007,      due in part to contributions of high voltage analog switches and multiplexers,      high voltage pulser ICs, high-speed MOSFET drivers*
*and discrete high      voltage FETs; (8) our view that Telecom market sales of optical to optical      switches and amplifier products and protection products for DSL are soft; and      (9) our view that historic seasonality in sales to the Medical Electronics      market may be mitigated due to our having more new products and design wins      in      our Medical Ultrasound Imaging Group in the past year. These statements are      only      predictions, are not guarantees, of future performance, and are subject to      risks, uncertainties, and other factors, some of which are beyond our control      and are difficult to predict, and could cause actual results to differ      materially from those expressed or forecasted in the forward-looking statements.      *
*These      risks and uncertainties include items such as no material adverse changes in      the      demand for our customer’s products in which the Company’s products are used;      competition to supply semiconductor devices in the markets in which the Company      competes does not increase and cause price erosion; demand materializes and      increases for recently released customer products incorporating the Company’s      products; that we have no delays in developing and releasing into production      our      planned new products, that there are no unexpected manufacturing issues as      production ramps up; the demand for the Company’s products or results of its      product development change is such that it would be unwise not to decrease      research and development; that the IRS will determine that more US income was      realized than the Company claimed or that fewer expenses were allowable; and      that some of the Company’s equipment will not be unexpectedly damaged or      obsoleted, thereby requiring replacement as well as those described in " Factors      Which May Affect Operating Results" under Item 7, “Management’s Discussion and      Analysis of Financial Condition and Results of Operation” in the Company’s      annual report of Form 10-K for the fiscal year ended April 1, 2006. The      information included in this Form 10-Q is provided as of the filing date with      the SEC and future events or circumstances could differ significantly from      the      forward-looking statements included herein. Accordingly, the readers are      cautioned not to place undue reliance on such statements. Except as required      by      law, the Company undertakes no obligation to update any forward-looking      statement, as a result of new information, future events, or      otherwise.*

----

**Critical      Accounting Policies**

**Overview**

**Results      of Operations**

**Net      Sales **

|                                                |   |  **Three                Months Ended**       |   |  **Six                Months Ended**   |   |
|-----------------------------------------------------|--------|---------------------------------------------------|--------|---------------------------------------------|--------|
| **Net                Sales (Dollars in thousands)** |   | **September                30,   2006** |   |  **October****1,                2005** |   |  **July****1,                2006** |   |  **Year-Over-Year                Change** |   |  **Sequential                Change** |   |  **September                30, 2006** |   |  **October****1,**** 2005** |   |  **Year-Over-Year                Change** |   |
| Imaging                                             |   | $                                                 | 11,077 |                                        | $      | 8,900 |   | $ | 9,877 |   |   | 24 | % |   | 12 | % |   $ | 20,954 |   | $ | 14,488 |   |   | 45 | % |
| Medical                Electronics                  |   |                                              | 10,162 |                                        |   | 7,281 |   |   | 8,659 |   |   | 40 | % |   | 17 | % |   | 18,821 |   |   | 13,401 |   |   | 40 | % |
| Telecom                                             |   |                                              | 3,670  |                                        |   | 3,236 |   |   | 4,419 |   |   | 13 | % |   | -17 | % |   | 8,089 |   |   | 6,519 |   |   | 24 | % |
| Other                                               |   |                                              | 1,612  |                                        |   | 809 |   |   | 1,610 |   |   | 99 | % |   | 0 | % |   | 3,222 |   |   | 1,811 |   |   | 78 | % |
| Net                Sales                            |   | $                                                 | 26,521 |                                        | $      | 20,226 |   | $ | 24,565 |   |   | 31 | % |   | 8 | % |                  $ | 51,086 |   | $ | 36,219 |   |   | 41 | % |

----

|                               |   |  **Three                Months Ended** |   |  **Six                Months Ended**          |   |
|------------------------------------|--------|---------------------------------------------|--------|----------------------------------------------------|--------|
|  **Markets**                  |   |  **September                30, 2006** |   |  ** ****October                1, 2005** |   |  **July                1, 2006** |   |  **September                30, 2006** |   |  ** ****October                1, 2005** |   |
| Imaging                            |   |                                        | 42     | %                                                  |   | 44 | % |   | 40 | % |   | 41 | % |   | 40 | % |
| Medical                Electronics |   |                                        | 38     | %                                                  |   | 36 | % |   | 35 | % |   | 37 | % |   | 37 | % |
| Telecom                            |   |                                        | 14     | %                                                  |   | 16 | % |   | 18 | % |   | 16 | % |   | 18 | % |
| Other                              |   |                                        | 6      | %                                                  |   | 4 | % |   | 7 | % |   | 6 | % |   | 5 | % |
| Net                Sales           |   |                                        | 100    | %                                                  |   | 100 | % |   | 100 | % |   | 100 | % |   | 100 | % |

----

*(in      thousands):*

|                                  |   | **Three                Months Ended** |   | **Six                Months Ended**         |   |
|---------------------------------------|--------|---------------------------------------|--------|---------------------------------------------|--------|
| **Net                Sales**          |   | **September                30, 2006** |   | **October                1, ****2005** |   | **July                1,****2006** |   | **Year-Over-Year                Change** |   | **Sequential                Change** |   | **September                30, 2006** |   | **October                1, 2005** |   | **Year-Over-Year                Change** |   |
| Asia                (excluding Japan) |   | $                                     | 12,886 |                                        | $      | 8,966 |   | $ | 12,067 |   |   | 44 | % |   | 7 | % |   $ | 24,953 |   | $ | 13,762 |   |   | 81 | % |
| United                States          |   |                                  | 7,361  |                                        |   | 7,220 |   |   | 7,527 |   |   | 2 | % |   | -2 | % |   | 14,888 |   |   | 14,570 |   |   | 2 | % |
| Europe                                |   |                                  | 3,981  |                                        |   | 1,831 |   |   | 2,419 |   |   | 117 | % |   | 65 | % |   | 6,400 |   |   | 3,136 |   |   | 104 | % |
| Japan                                 |   |                                  | 2,035  |                                        |   | 1,718 |   |   | 1,950 |   |   | 18 | % |   | 4 | % |   | 3,985 |   |   | 3,453 |   |   | 15 | % |
| Other                                 |   |                                  | 258    |                                        |   | 491 |   |   | 602 |   |   | -47 | % |   | -57 | % |   | 860 |   |   | 1,298 |   |   | -34 | % |
| Net                Sales              |   | $                                     | 26,521 |                                        | $      | 20,226 |   | $ | 24,565 |   |   | 31 | % |   | 8 | % |                  $ | 51,086 |   | $ | 36,219 |   |   | 41 | % |
|                                  |   |                                  |   |                                        |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Domestic                Sales         |   | $                                     | 7,361  |                                        | $      | 7,220 |   | $ | 7,527 |   |   | 2 | % |   | -2 | % |                  $ | 14,888 |   | $ | 14,570 |   |   | 2 | % |
| International                Sales    |   |                                  | 19,160 |                                        |   | 13,006 |   |   | 17,038 |   |   | 47 | % |   | 12 | % |   | 36,198 |   |   | 21,649 |   |   | 67 | % |
| Net                Sales              |   | $                                     | 26,521 |                                        | $      | 20,226 |   | $ | 24,565 |   |   | 31 | % |   | 8 | % |                  $ | 51,086 |   | $ | 36,219 |   |   | 41 | % |

***Gross      Profit***

----

|                                                                                              |   | **Three                Months Ended** |   | **Six                Months Ended** |   |
|---------------------------------------------------------------------------------------------------|--------|---------------------------------------|--------|-------------------------------------|--------|
| *(Dollars                in thousands)*                                                           |   | **September                30, 2006** |   | **October                1, 2005**  |   | **July                1, 2006** |   | **September                30, 2006** |   | **October                1, 2005** |   |
| Gross                Margin Percentage                                                            |   |                                  | 61     | %          |   | 56 | %     |   | 60 | %    |   | 61 | %     |   | 57 | % |
| *Included                in Gross Margin Percentage Above*                                        |   |                                  |   |                                |   |   |   |   |   |   |   |   |
| Gross                Margin Benefit from Sale of Previously Written Down                Inventory |   | $                                     | 434    |                                | $      | 306 |   | $ | 516 |   | $ | 950 |   | $ | 563 |   |
| Percentage                of Net Sales                                                            |   |                                  | 2      | %                                   |   | 2 | % |   | 2 | % |   | 2 | % |   | 2 | % |

***Research      and Development (R&D) Expenses***

|                                    |   | **Three                Months Ended** |   | **Six                Months Ended** |   |
|-----------------------------------------|--------|---------------------------------------|--------|-------------------------------------|--------|
| *(Dollars                in thousands)* |   | **September                30, 2006** |   | **October                1, 2005**  |   | **July                1,****2006** |   | **Year-Over-Year                Change** |   | **Sequential                Change** |   | **September                30, 2006** |   | **October                1,   2005** |   | **Year-Over-Year                Change** |   |
| R&D                Expenses         |   | $                                     | 3,658  |                                | $      | 2,598 |   | $ | 3,949 |   |   | 41 | % |   | -7 | %    | $ | 7,607 |   | $ | 5,357 |   |   | 42 | % |
| Percentage                of Net Sales  |   |                                  | 14     | %                         |   | 13 | %  |   | 16 | %    |   |   |   |   |   |   |   | 15 | %  |   | 15 | % |   |   |   |

----

***Selling,      General and Administrative (SG&A***
**)      Expenses**

|                                    |   | **Three                Months Ended** |   | **Six                Months Ended** |   |
|-----------------------------------------|--------|---------------------------------------|--------|-------------------------------------|--------|
| *(Dollars                in thousands)* |   | **September                30, 2006** |   | **October                1, 2005**  |   | **July                1,**** 2006** |   | **Year-Over-Year                Change** |   | **Sequential                Change** |   | **September                30, 2006** |   | **October                1, 2005** |   | **Year-Over-Year                Change** |   |
| SG&A                Expenses        |   | $                                     | 3,826  |                                | $      | 3,248 |   | $ | 3,803 |   |   | 18 | % |   | 1 | % |  $ | 7,629 |   | $ | 6,436 |   |   | 19 | % |
| Percentage                of Net Sales  |   |                                  | 14     | %                                   |   | 16 | % |   | 15 | % |   |   |   |   |   |   |   | 15 | % |   | 18 | % |   |   |   |

***Interest      Income and Other Income, Net***

|                                                 |   | **Three                Months Ended** |   | **Six                Months Ended** |   |
|------------------------------------------------------|--------|---------------------------------------|--------|-------------------------------------|--------|
| *(Dollars                in thousands)*              |   | **September                30, 2006** |   | **October                1, 2005**  |   | **July                1,****2006** |   | **Year-Over-Year                Change** |   | **Sequential                Change** |   | **September                30, 2006** |   | **October                1,   2005** |   | **Year-Over-Year                Change** |   |
| Interest                Income and Other Income, Net |   | $                                     | 968    |                                | $      | 702 |   | $ | 1,288 |   |   | 38 | % |   | -25 | % | $ | 2,256 |   | $ | 1,608 |   |   | 40 | % |
| Percentage                of Net Sales               |   |                                  | 4      | %                                   |   | 3 | % |   | 5 | % |   |   |   |   |   |   |   | 4 | % |   | 4 | % |   |   |   |

----

***Provision      for Income Taxes***

----

**Financial      Condition**

***Overview***

***Liquidity      and Capital Resources***

----

***Off-Balance      Sheet Arrangements***

***Contractual      Obligations***

*in      thousands*

|                                              |   | **Payment                Due by Year** |   |
|---------------------------------------------------|--------|----------------------------------------|--------|
| **Contractual                Obligations**        |   | **Total**                              |   | **Less                than 1 Year** |   | **2-3                Years** |   | **4-5                Years** |   | **After                5 Years** |   |
| Operating                lease obligations (1)    |   | $                                      | 4,632  |   | $ | 1,064 |   | $ | 2,045 |   | $ | 1,523 |   | $ | -- |   |
| Purchase                obligations (2)           |   |                                   | 7,415  |   |   | 7,383 |   |   | 32 |   |   | -- |   |   | -- |   |
| Total                contractual cash obligations |   | $                                      | 12,047 |   | $ | 8,447 |   | $ | 2,077 |   | $ | 1,523 |   | $ | -- |   |

*(1)*

*      We      lease facilities under non-cancelable lease agreements expiring at various      times      through April 2011. Rental expense net of sublease income for the three and      six      months ended September 30, 2006, amounted to $240,000 and $474,000,      respectively.*

*(2)*

*      To      obtain favorable pricing and resource commitment, we commit to volume purchases      from suppliers of manufacturing materials and services.*

----

**Recent      Accounting Pronouncements**

*Considering      the Effects of Prior Year Misstatements when Quantifying Current Year      Misstatements.*

*Fair      Value Measurements, *

*Accounting      for Uncertainty in Income Taxes: An Interpretation of FASB Statement No.      109*
*Accounting      for Income Taxes*

***Available      Information***

**Item      3. Quantitative and Qualitative Disclosures About Market Risk**

----

**Item      4. Controls and Procedures **

**(a)      Disclosure Controls and Procedures.**

*Disclosure      Controls and Procedures*
*.*

*Limitations      on the Effectiveness of Disclosure Controls*
*.*

*Evaluation      of Disclosure Controls and Procedures.*

**(b)      Internal Control over Financial Reporting.**

----

**PART      II - OTHER INFORMATION**

**Item      1. Legal Proceedings **

*** ***

**Item      1A. Risk Factors**

**Item      2.**
** **
**Unregistered      Sales of Equity Securities and Use of Proceeds**

| **Period**                        |   | **Total                Number of Shares Purchased****(1)** |       | **Average                Price****Paid                Per Share** |   | **Total                Number of Shares Purchased as Part of Publicly Announced Plans or                Programs****(2)**** ** |   | **Maximum                Number of Shares that May Yet be Purchased Under the Plans or                Programs** |   |
|-----------------------------------|--------|------------------------------------------------------------|------------|-------------------------------------------------------------------|--------|-------------------------------------------------------------------------------------------------------------------------------------|--------|------------------------------------------------------------------------------------------------------------------|--------|
|                              |   |                                                       |       |                                                              |   |                                                                                                                                |   |                                                                                                             |   |
| 07/02/06-                07/29/06 |   |                                                       | --         |                                                              |   | --                                                                                                                                  |   |                                                                                                             | --     |   |   | 784,100 |   |
| 07/30/06-                08/26/06 |   |                                                       | 35,000     |                                                              | $      | 31.62                                                                                                                               |   |                                                                                                             | --     |   |   | 749,100 |   |
| 08/27/06-                09/30/06 |   |                                                       | --         |                                                              | $      | --                                                                                                                                  |   |                                                                                                             | --     |   |   | 749,100 |   |
| **Total**                         |   |                                                       | **35,000** |                                                              | **$**  | **31.62**                                                                                                                           |   |                                                                                                             | **--** |   |   | **749,100** |   |

| *(1)  * | *Our                current share repurchase program, under which we repurchased these                35,000                shares, has been in place since 1999. We are not certain but do not                believe we publicly announced this program, although our financial                statements have reflected purchases from time to time under this                program.                These 35,000 shares were purchased in open market                transactions.* |
|-------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| *(2)  * | *We                adopted a share repurchase program in 1992 authorizing the repurchase                of                1,000,000 shares. Our board of directors terminated this program                in 1999                after 938,000 shares had been repurchased and adopted a share repurchase                program authorizing the repurchase of 900,000 shares plus the 62,000                shares authorized for repurchase under the 1992 program whose repurchase                had not been affected. As described in footnote (1), we are not certain                but do not believe that we publicly announced our 1999 repurchase                plan.                The 1999 repurchase program has no expiration date, other than, unless                extended, when an aggregate of 962,000 shares have been repurchased.                Neither this program nor any other repurchase program or plan has                expired                during our second quarter ended September 30, 2006 nor has the Company                decided to terminate any repurchase plan or program prior to its                expiration. There are no existing repurchase plans or programs under                which                the Company does not intend to make further                purchases.* |
|-------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

**Item      3. Defaults Upon Senior Securities**

----

**Item      4. Submission of Matters to a Vote of Security Holders**

| **Matter                Acted Upon**               |   | **Votes                For** |       | **Votes                Against** |   | **Votes                Withheld/****Abstentions** |   | **Broker                Non-Votes** |    |
|----------------------------------------------------|--------|------------------------------|------------|----------------------------------|--------|---------------------------------------------------|--------|-------------------------------------|---------|
| 1.  Election                of Directors |
|                                               |   |                         |       |                             |   |                                              |   |                                |    |   |   |   |   |
| Henry                C. Pao                        |   |                         | 12,604,868 |                             |   | 0                                                 |   |                                | 393,711 |   |   | 0 |   |
| Benedict                C.K. Choy                  |   |                         | 12,766,232 |                             |   | 0                                                 |   |                                | 232,347 |   |   | 0 |   |
| W.                Mark Loveless                    |   |                         | 12,975,313 |                             |   | 0                                                 |   |                                | 23,266  |   |   | 0 |   |
| Elliott                Schlam                      |   |                         | 12,975,513 |                             |   | 0                                                 |   |                                | 23,066  |   |   | 0 |   |
| Milton                Feng                         |   |                         | 12,975,063 |                             |   | 0                                                 |   |                                | 23,516  |   |   | 0 |   |
|                                               |   |                         |       |                             |   |                                              |   |                                |    |   |   |   |   |

| 2.  Proposal                to ratify the appointment of PricewaterhouseCoopers LLP as the independent                registered public accounting firm of the Company for the fiscal year                ending March 31, 2007. |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                                                                       |   |   |   |   |
|                                                                                                                                                                                                                                       | 12,995,163 |                                                3,363 |                          53 |                             0 |

**Item      5. Other Information**

**Item      6. Exhibits **

----

**SIGNATURE**

|         |                                                                                       |                                               |
|--------------|--------------------------------------------------------------------------------------------|----------------------------------------------------|
|         | **SUPERTEX,                INC.***(Registrant)*                                            |
|    |                                                                                  |                                          |
|         | By:                                                                              | /s/ Phillip              A. Kagel   |
|         | Vice              President of Finance and Chief Financial              Officer            |
|         | *(Duly                Authorized Officer and Principal Financial and**Accounting Officer)* |
|         |                                                                                       |
|         |  Date: November 8, 2006                                                          |
**                                                 **

----

**Exhibit      31.1**

**Certifications      Under Rule 13a-14(a)/l5d-14(a)**

|                                            |                                 |                                            |
|-------------------------------------------------|--------------------------------------|-------------------------------------------------|
|                                            |                                 |
|                                       |                            |                                       |
| Date:              November 8, 2006   | By:                        | /s/ Henry              C.              Pao |
|                                            | Henry              C. Pao, Ph.D.     |
|                                            | Chief              Executive Officer |

----

**Exhibit        31.2**

**Certifications        Under Rule 13a-14(a)/l5d-14(a)**

|                                        |                                                                                |                                     |
|---------------------------------------------|-------------------------------------------------------------------------------------|------------------------------------------|
|                                        |                                                                                |
|                                   |                                                                           |                                |
| Date:                November 8, 2006  | By:                                                                       | /s/ Phillip                A. Kagel |
|                                        | Phillip                A. Kagel                                                     |
|                                        | Vice                President of Finance and Chief Financial                Officer |

----

**Exhibit      32.1**

**Statement      of Chief Executive Officer under 18 U.S.C. § 1350**

|   | (i) | the                quarterly report of the Company on Form 10-Q for the period ended                September 30, 2006, as filed with the Securities and Exchange Commission                (the “Report”), fully complies with the requirements of Section 13(a) or                15(d), whichever is applicable, of the Securities Exchange Act of                1934,                and |
|--------|-----|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (ii) | the                information contained in the Report fairly presents, in all material                respects, the financial condition and results of operations of the                Company                at the dates and for the periods                indicated. |
|--------|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                                                                                                                                                               |                                 |                                     |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------|------------------------------------------|
|                                                                                                                                                               |                                 |
|                                                                                                                                                          |                            |                                |
| Date:              November 8,              2006                    | By:                        | /s/ Henry              C. Pao  |
|                                                                                                                                                               | Henry              C. Pao, Ph.D.     |
|                                                                                                                                                               | Chief              Executive Officer |

*The      material contained in this Exhibit 32.1 is not deemed “filed” with the SEC and      is not to be incorporated by reference into any filing of the Company under      the      Securities Act of 1933 or the Securities Exchange Act of 1934, whether made      before or after the date hereof and irrespective of any general incorporation      language contained in such filing.*

----

**Exhibit      32.2**

**Statement      of Chief Financial Officer under 18 U.S.C. § 1350**

|   | (i) | the                quarterly report of the Company on Form 10-Q for the period ended                September 30, 2006, as filed with the Securities and Exchange Commission                (the “Report”), fully complies with the requirements of Section 13(a) or                15(d), whichever is applicable, of the Securities Exchange Act of                1934,                and |
|--------|-----|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (ii) | the                information contained in the Report fairly presents, in all material                respects, the financial condition and results of operations of the                Company                at the dates and for the periods                indicated. |
|--------|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                                           |                                                                            |                                   |
|-------------------------------------------|---------------------------------------------------------------------------------|----------------------------------------|
|                                      |                                                                            |
|                                 |                                                                       |                              |
| Date:              November 8, 2006  | By:                                                                   | /s/ Phillip              A. Kagel |
|                                      | Phillip              A. Kagel                                                   |
|                                      | Vice              President of Finance and Chief Financial              Officer |

*The      material contained in this Exhibit 32.2 is not deemed “filed” with the SEC and      is not to be incorporated by reference into any filing of the Company under      the      Securities Act of 1933 or the Securities Exchange Act of 1934, whether made      before or after the date hereof and irrespective of any general incorporation      language contained in such filing.*

----