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| x      | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934  |
|--------|------------------------------------------------------------------------------------------|
|   | For the quarterly period ended March 31, 2010                                            |
|   |                                                                                     |
|   | or                                                                                       |
|   |                                                                                     |
| o      | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
|   | For the transition period from _______________________to____________________________     |

| Delaware(State or other jurisdiction ofincorporation or organization) |   | 26-2417032(I.R.S. EmployerIdentification No.) |   |
|-----------------------------------------------------------------------|--------|-----------------------------------------------|--------|

| Large accelerated filer    | o |                                                            | Accelerated filer         | o |
|-------------------------------------------|---|-----------------------------------------------------------------|---------------------------|---|
| Non-accelerated filer           | o | (Do not check if a smaller reporting company)    | Smaller reporting company | x |

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| Table of Contents              |                                                                                  |                                                                                            |
|--------------------------------|---------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------|
|                           |                                                                                  |                                                                                            |   |   |
|                           |                                                                                  |                                                                                            |   | Page |
| PART I - FINANCIAL INFORMATION |                                                                                  |                                                                                            |
| Item 1.                        | Financial Statements:                                                                 |                                                                                            | 1 |
|                           |                                                                                  | Unaudited Condensed Balance Sheets as of March 31, 2010 and December 31, 2009                   |   | 1 |
|                           |                                                                                  | Unaudited Condensed Statements of Operations for the three months ended March 31, 2010 and 2009 |   | 2 |
|                           |                                                                                  | Unaudited Condensed Statements of Cash Flows for the three months ended March 31, 2010 and 2009 |   | 3 |
|                           |                                                                                  | Notes to Unaudited Condensed Financial Statements                                               |   | 4 |
| Item 2.                        | Management's Discussion and Analysis of Financial Condition and Results of Operations |                                                                                            | 9 |
| Item 3.                        | Quantitative and Qualitative Disclosures about Market Risk                            |                                                                                            | 13 |
| Item 4.                        | Controls and Procedures                                                               |                                                                                            | 13 |
|                           |                                                                                  |                                                                                            |   |   |
| PART II - OTHER INFORMATION    |                                                                                  |                                                                                            |
| Item 1.                        | Legal Proceedings                                                                     |                                                                                            | 13 |
| Item 1A.             | Risk Factors                                                                          |                                                                                            | 14 |
| Item 2.                        | Unregistered Sales of Equity Securities and Use of Proceeds                           |                                                                                            | 14 |
| Item 3.                        | Defaults Upon Senior Securities                                                       |                                                                                            | 14 |
| Item 4.                        | (Removed and Reserved)                                                                |                                                                                            | 14 |
| Item 5.                        | Other Information                                                                     |                                                                                            | 14 |
| Item 6.                        | Exhibits                                                                              |                                                                                            | 14 |
|                           |                                                                                  |                                                                                            |   |   |
|                           |                                                                                  | SIGNATURES                                                                                      |   | 15 |

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| PART I - FINANCIAL INFORMATION                                                                 |
|------------------------------------------------------------------------------------------------|
| ITEM 1.  FINANCIAL STATEMENTS                                                        |   |   |   |   |   |   |
|                                                                                           |   |   |   |   |   |   |
| RIDGEWOOD ENERGY Y FUND, LLC                                                                   |
| UNAUDITED CONDENSED BALANCE SHEETS                                                             |
| (in thousands, except share data)                                                              |
|                                                                                           |   |   |   |   |   |   |
|                                                                                           |   |   |   |   |   |   |
|                                                                                           |   | March 31, 2010 |   |   | December 31, 2009 |   |
| ASSETS                                                                                         |   |   |   |   |   |   |
| Current assets:                                                                                |   |   |   |   |   |   |
| Cash and cash equivalents                                                                      |   | $ | 12,337 |   |   | $ | 13,965 |   |
| Short-term investments in marketable securities                                                |   |   | 20,004 |   |   |   | 20,001 |   |
| Production receivable                                                                          |   |   | 4 |   |   |   | 30 |   |
| Other current assets                                                                           |   |   | 13 |   |   |   | 21 |   |
| Total current assets                                                                           |   |   | 32,358 |   |   |   | 34,017 |   |
| Salvage fund                                                                                   |   |   | 1,064 |   |   |   | 1,058 |   |
| Oil and gas properties:                                                                        |   |   |   |   |   |   |   |   |
| Advances to operators for working interests and expenditures                                   |   |   | 1,141 |   |   |   | 2,907 |   |
| Unproved properties                                                                            |   |   | 12,310 |   |   |   | 9,480 |   |
| Proved properties                                                                              |   |   | 13,493 |   |   |   | 13,333 |   |
| Less:  accumulated depletion and amortization                                        |   |   | (3,373 | ) |   |   | (3,351 | ) |
| Total oil and gas properties                                                                   |   |   | 23,571 |   |   |   | 22,369 |   |
| Total assets                                                                                   |   | $ | 56,993 |   |   | $ | 57,444 |   |
|                                                                                           |   |   |   |   |   |   |   |   |
| LIABILITIES AND MEMBERS' CAPITAL                                                               |   |   |   |   |   |   |   |   |
| Current liabilities:                                                                           |   |   |   |   |   |   |   |   |
| Due to operators                                                                               |   | $ | 1,969 |   |   | $ | 1,443 |   |
| Accrued expenses                                                                               |   |   | 120 |   |   |   | 387 |   |
| Total current liabilities                                                                      |   |   | 2,089 |   |   |   | 1,830 |   |
| Asset retirement obligations                                                                   |   |   | 331 |   |   |   | 327 |   |
| Total liabilities                                                                              |   |   | 2,420 |   |   |   | 2,157 |   |
|                                                                                           |   |   |   |   |   |   |   |   |
| Commitments and contingencies (Note 8)                                                         |   |   |   |   |   |   |   |   |
|                                                                                           |   |   |   |   |   |   |   |   |
| Members' capital:                                                                              |   |   |   |   |   |   |   |   |
| Manager:                                                                                       |   |   |   |   |   |   |   |   |
| Distributions                                                                                  |   |   | (38 | ) |   |   | (38 | ) |
| Accumulated deficit                                                                            |   |   | (909 | ) |   |   | (821 | ) |
| Manager's total                                                                                |   |   | (947 | ) |   |   | (859 | ) |
|                                                                                           |   |   |   |   |   |   |   |   |
| Shareholders:                                                                                  |   |   |   |   |   |   |   |   |
| Capital contributions (500 shares authorized;                                                  |   |   |   |   |   |   |   |   |
| 492.3709 issued and outstanding)                                                               |   |   | 97,818 |   |   |   | 97,818 |   |
| Syndication costs                                                                              |   |   | (11,668 | ) |   |   | (11,668 | ) |
| Distributions                                                                                  |   |   | (216 | ) |   |   | (216 | ) |
| Accumulated deficit                                                                            |   |   | (30,414 | ) |   |   | (29,788 | ) |
| Shareholders' total                                                                            |   |   | 55,520 |   |   |   | 56,146 |   |
| Total members' capital                                                                         |   |   | 54,573 |   |   |   | 55,287 |   |
| Total liabilities and members' capital                                                         |   | $ | 56,993 |   |   | $ | 57,444 |   |
|                                                                                           |   |   |   |   |   |   |   |   |
|                                                                                           |   |   |   |   |   |   |   |   |
| The accompanying notes are an integral part of these unaudited condensed financial statements. |

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| RIDGEWOOD ENERGY Y FUND, LLC                                                                   |
|------------------------------------------------------------------------------------------------|
| UNAUDITED CONDENSED STATEMENTS OF OPERATIONS                                                   |
| (in thousands, except per share data)                                                          |
|                                                                                           |   |   |   |   |   |   |
|                                                                                           |   |   |   |   |   |   |
|                                                                                           |   | Three months ended March 31, |   |
|                                                                                           |   | 2010 |   |   | 2009 |   |
| Revenue                                                                                        |   |   |   |   |   |   |
| Oil and gas revenue                                                                            |   | $ | 43 |   |   | $ | - |   |
|                                                                                           |   |   |   |   |   |   |   |   |
| Expenses                                                                                       |   |   |   |   |   |   |   |   |
| Depletion and amortization                                                                     |   |   | 22 |   |   |   | - |   |
| Dry-hole costs                                                                                 |   |   | 3 |   |   |   | 8,278 |   |
| Management fees to affiliate (Note 6)                                                          |   |   | 491 |   |   |   | 565 |   |
| Operating expenses                                                                             |   |   | 127 |   |   |   | 3 |   |
| General and administrative expenses                                                            |   |   | 124 |   |   |   | 352 |   |
| Total expenses                                                                                 |   |   | 767 |   |   |   | 9,198 |   |
| Loss from operations                                                                           |   |   | (724 | ) |   |   | (9,198 | ) |
| Other income                                                                                   |   |   |   |   |   |   |   |   |
| Interest income                                                                                |   |   | 10 |   |   |   | 111 |   |
| Net loss                                                                                       |   | $ | (714 | ) |   | $ | (9,087 | ) |
|                                                                                           |   |   |   |   |   |   |   |   |
| Manager Interest                                                                               |   |   |   |   |   |   |   |   |
| Net loss                                                                                       |   | $ | (88 | ) |   | $ | (215 | ) |
|                                                                                           |   |   |   |   |   |   |   |   |
| Shareholder Interest                                                                           |   |   |   |   |   |   |   |   |
| Net loss                                                                                       |   | $ | (626 | ) |   | $ | (8,872 | ) |
| Net loss per share                                                                             |   | $ | (1,271 | ) |   | $ | (18,019 | ) |
|                                                                                           |   |   |   |   |   |   |   |   |
|                                                                                           |   |   |   |   |   |   |   |   |
| The accompanying notes are an integral part of these unaudited condensed financial statements. |   |

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| RIDGEWOOD ENERGY Y FUND, LLC                                                                                                                                                                  |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| UNAUDITED CONDENSED STATEMENTS OF CASH FLOWS                                                                                                                                                  |
| (in thousands)                                                                                                                                                                                |
|                                                                                                                                                                                          |   |   |   |   |   |   |
|                                                                                                                                                                                          |   |   |   |   |   |   |
|                                                                                                                                                                                          |   | Three months ended March 31, |   |
|                                                                                                                                                                                          |   | 2010 |   |   | 2009 |   |
|                                                                                                                                                                                          |   |   |   |   |   |   |
| Cash flows from operating activities                                                                                                                                                          |   |   |   |   |   |   |
| Net loss                                                                                                                                                                                      |   | $ | (714 | ) |   | $ | (9,087 | ) |
| Adjustments to reconcile net loss to net cash                                                                                                                                                 |   |   |   |   |   |   |   |   |
|    used in operating activities:                                                                                                                                               |   |   |   |   |   |   |   |   |
| Depletion and amortization                                                                                                                                                                    |   |   | 22 |   |   |   | - |   |
| Dry-hole costs                                                                                                                                                                                |   |   | 3 |   |   |   | 8,278 |   |
| Accretion expense                                                                                                                                                                             |   |   | 4 |   |   |   | 1 |   |
| Interest earned on marketable securities                                                                                                                                                      |   |   | (3 | ) |   |   | (104 | ) |
| Changes in assets and liabilities:                                                                                                                                                            |   |   |   |   |   |   |   |   |
| Decrease in production receivable                                                                                                                                                             |   |   | 26 |   |   |   | - |   |
| Decrease in other current assets                                                                                                                                                              |   |   | 8 |   |   |   | 106 |   |
| Decrease in due to operators                                                                                                                                                                  |   |   | (4 | ) |   |   | - |   |
| Decrease in accrued expenses                                                                                                                                                                  |   |   | (267 | ) |   |   | (49 | ) |
| Net cash used in operating activities                                                                                                                                                         |   |   | (925 | ) |   |   | (855 | ) |
|                                                                                                                                                                                          |   |   |   |   |   |   |   |   |
| Cash flows from investing activities                                                                                                                                                          |   |   |   |   |   |   |   |   |
| Payments to operators for working interests                                                                                                                                                   |   |   |   |   |   |   |   |   |
| and expenditures                                                                                                                                                                              |   |   | (19 | ) |   |   | - |   |
| Capital expenditures for oil and gas properties                                                                                                                                               |   |   | (678 | ) |   |   | (10,111 | ) |
| Investments in salvage fund                                                                                                                                                                   |   |   | (6 | ) |   |   | (6 | ) |
| Net cash used in investing activities                                                                                                                                                         |   |   | (703 | ) |   |   | (10,117 | ) |
|                                                                                                                                                                                          |   |   |   |   |   |   |   |   |
| Cash flows from financing activities                                                                                                                                                          |   |   |   |   |   |   |   |   |
| Syndication costs                                                                                                                                                                             |   |   | - |   |   |   | (12 | ) |
| Net cash used in financing activities                                                                                                                                                         |   |   | - |   |   |   | (12 | ) |
| Net decrease in cash and cash equivalents                                                                                                                                                     |   |   | (1,628 | ) |   |   | (10,984 | ) |
|                                                                                                                                                                                          |   |   |   |   |   |   |   |   |
| Cash and cash equivalents, beginning of period                                                                                                                                                |   |   | 13,965 |   |   |   | 15,075 |   |
| Cash and cash equivalents, end of period                                                                                                                                                      |   | $ | 12,337 |   |   | $ | 4,091 |   |
|                                                                                                                                                                                          |   |   |   |   |   |   |   |   |
| Supplemental schedule of non-cash investing activities                                                                                                                                        |   |   |   |   |   |   |   |   |
|   Advances used for capital expenditures in oil and gas properties      reclassified to unproved properties, proved properties and     dry-hole costs |   | $ | 1,785 |   |   | $ | 3,018 |   |
|                                                                                                                                                                                          |   |   |   |   |   |   |   |   |
|                                                                                                                                                                                          |   |   |   |   |   |   |   |   |
| The accompanying notes are an integral part of these unaudited condensed financial statements.                                                                                                |   |

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|                                                     |   | March 31, 2010 |   |   | December 31, 2009 |   |
|----------------------------------------------------------|--------|----------------|--------|--------|-------------------|--------|
|                                                     |   | (in thousands) |   |
| Balance, beginning of period                             |   | $              | 9,480  |   |              | $      | 4,923 |   |
| Additions to capitalized exploratory well costs          |   |           |   |   |              |   |   |   |
|   pending the determination of proved reserves |   |           | 2,830  |   |              |   | 10,874 |   |
| Reclassifications to proved properties based on          |   |           |   |   |              |   |   |   |
|   the determination of proved reserves         |   |           | -      |   |              |   | (5,087 | ) |
| Capitalized exploratory well costs charged to            |   |           |   |   |              |   |   |   |
|   dry-hole costs                               |   |           | -      |   |              |   | (1,230 | ) |
| Balance, end of period                                   |   | $              | 12,310 |   |              | $      | 9,480 |   |

|            |   | Three months ended March 31, |   |
|-----------------|--------|------------------------------|--------|
| Project         |   | 2010                         |   |   | 2009 |   |
|            |   | (in thousands)               |   |
|            |   |                         |   |   |   |   |
| Bison Project   |   | $                            | 17     |   |   | $ | 280 |   |
| Neptune Project |   |                         | (14    | ) |   |   | 7,998 |   |
|            |   | $                            | 3      |   |   | $ | 8,278 |   |

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|                        |            |   |     |   |   | Total spent    |   |   |            |   |   |
|-----------------------------|-----------------|--------|----------|--------|--------|----------------|--------|--------|-----------------|--------|--------|
|                        |            |   | Working  |   |   | through        |   |   | Total Estimated |   |   |
|                        |            |   | Interest |   |   | March 31, 2010 |   |   | Budget          |   | Status |
| Future and Current Projects |            |   |     |   |   |           |   |   |            |   |
|                        | Beta Project    |   |     | 2.0    | %      |           | $      | 187    |            |   | $      | 3,125 |   | Commenced drilling March 2010.Results expected June 2010. |
|                        | Targa Project   |   |     | 1.0    | %      |           | $      | 682    |            |   | $      | 3,857 |   | Commenced drilling February 2010.Results expected April 2010. |
|                        | Dakota Project  |   |     | 7.5    | %      |           | $      | 3,070  |            |   | $      | 4,967 |   | Commenced drilling December 2009.Results expected May 2010. |
|                        | Ajax Project    |   |     | 12.5   | %      |           | $      | 3,686  |            |   | $      | 3,686 |   | Currently exploring other opportunities for the well, including selling the Fund's interest. |
| Non-producing Properties    |            |   |     |   |   |           |   |   |            |   |   |   |   |
|                        | Liberty Project |   |     | 3.0    | %      |           | $      | 4,160  |            |   | $      | 4,753 |   | Completion efforts are ongoing.Production expected July 2010. |
|                        | Carrera Project |   |     | 3.0    | %      |           | $      | 3,086  |            |   | $      | 4,692 |   | Completion efforts are ongoing.Production expected fourth quarter 2010. |
|                        | Alpha Project   |   |     | 7.5    | %      |           | $      | 4,668  |            |   | $      | 12,652 |   | Completion efforts are ongoing.Production expected second quarter 2011. |
|                        | Raven Project   |   |     | 6.25   | %      |           | $      | 1,157  |            |   | $      | 1,751 |   | Completion efforts are ongoing.Production expected August 2010. |
| Producing Properties        |            |   |     |   |   |           |   |   |            |   |   |   |   |
|                        | Cobalt Project  |   |     | 12.0   | %      |           | $      | 5,925  |            |   | $      | 6,009 |   | Production commenced June 2009.Recompletion activites commmenced April 2010at an estimated cost of $0.1 million. |

|                                |   | Three months ended March 31, |   |
|-------------------------------------|--------|------------------------------|--------|
|                                |   | 2010                         |   |   | 2009 |   |
|                                |   | (in thousands)               |   |
| Revenue                             |   |                         |   |   |   |   |
| Oil and gas revenue                 |   | $                            | 43     |   |   | $ | - |   |
|                                |   |                         |   |   |   |   |   |   |
| Expenses                            |   |                         |   |   |   |   |   |   |
| Depletion and amortization          |   |                         | 22     |   |   |   | - |   |
| Dry-hole costs                      |   |                         | 3      |   |   |   | 8,278 |   |
| Management fees to affiliate        |   |                         | 491    |   |   |   | 565 |   |
| Operating expenses                  |   |                         | 127    |   |   |   | 3 |   |
| General and administrative expenses |   |                         | 124    |   |   |   | 352 |   |
| Total expenses                      |   |                         | 767    |   |   |   | 9,198 |   |
| Loss from operations                |   |                         | (724   | ) |   |   | (9,198 | ) |
| Other income                        |   |                         |   |   |   |   |   |   |
| Interest income                     |   |                         | 10     |   |   |   | 111 |   |
| Net loss                            |   | $                            | (714   | ) |   | $ | (9,087 | ) |

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|            |   | Three months ended March 31, |   |
|-----------------|--------|------------------------------|--------|
| Project         |   | 2010                         |   |   | 2009 |   |
|            |   | (in thousands)               |   |
|            |   |                         |   |   |   |   |
| Bison Project   |   | $                            | 17     |   |   | $ | 280 |   |
| Neptune Project |   |                         | (14    | ) |   |   | 7,998 |   |
|            |   | $                            | 3      |   |   | $ | 8,278 |   |

|                    |   | Three months ended March 31, |   |
|-------------------------|--------|------------------------------|--------|
|                    |   | 2010                         |   |   | 2009 |   |
|                    |   | (in thousands)               |   |
|                    |   |                         |   |   |   |   |
| Geological costs        |   | $                            | 105    |   |   | $ | 2 |   |
| Lease operating expense |   |                         | 18     |   |   |   | - |   |
| Accretion expense       |   |                         | 4      |   |   |   | 1 |   |
|                    |   | $                            | 127    |   |   | $ | 3 |   |

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|                 |   | Three months ended March 31, |   |
|----------------------|--------|------------------------------|--------|
|                 |   | 2010                         |   |   | 2009 |   |
|                 |   | (in thousands)               |   |
|                 |   |                         |   |   |   |   |
| Insurance expense    |   | $                            | 73     |   |   | $ | 294 |   |
| Accounting fees      |   |                         | 37     |   |   |   | 30 |   |
| Trust fees and other |   |                         | 14     |   |   |   | 28 |   |
|                 |   | $                            | 124    |   |   | $ | 352 |   |

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ATIV

ROL

ROC

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TOR

ALE

PON

OVE

ORM

IBI

| EXHIBIT |   |                                                                                                                                                                                                                                                    |           |             |
|---------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|------------------|
| NUMBER  |   | TITLE OF EXHIBIT                                                                                                                                                                                                                                        |           | METHOD OF FILING |
|    |   |                                                                                                                                                                                                                                                    |           |             |
| 31.1    |   | Certification of Robert E. Swanson, Chief Executive Officer of the Fund, pursuant to Exchange Act Rule 13a-14(a)                                                                                                                                        | Filed herewith |
|    |   |                                                                                                                                                                                                                                                    |           |             |
| 31.2    |   | Certification of Kathleen P. McSherry, Chief Financial Officer of the Fund, pursuant to Exchange Act Rule 13a-14(a)                                                                                                                                     | Filed herewith |
|    |   |                                                                                                                                                                                                                                                    |           |             |
| 32      |   | Certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of The Sarbanes-Oxley Act of 2002, signed by Robert E. Swanson, Chief Executive Officer of the Fund and Kathleen P. McSherry, Chief Financial Officer of the Fund |           | Filed herewith   |

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NAT

|   |           |   |   |   | RIDGEWOOD ENERGY Y FUND, LLC                    |
|--------|----------------|--------|--------|--------|------------------------------------------------------|
| Dated: | April 27, 2010 | By:    | /s/    |   | ROBERT E. SWANSON                                    |
|   |           |   | Name:  |   | Robert E. Swanson                                    |
|   |           |   | Title: |   | Chief Executive Officer                              |
|   |           |   |   |   | (Principal Executive Officer)                        |
|   |           |   |   |   |
|   |           |   |   |   |
| Dated: | April 27, 2010 | By:    | /s/    |   | KATHLEEN P. MCSHERRY                                 |
|   |           |   | Name:  |   | Kathleen P. McSherry                                 |
|   |           |   | Title: |   | Executive Vice President and Chief Financial Officer |
|   |           |   |   |   | (Principal Financial Officer)                        |
|   |           |   |   |   |
|   |           |   |   |   |

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