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|  | ☒ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2015 |
|--|---------|----------------------------------------------------------------------------------------------------------------------------------|

|  | ☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM            TO |
|--|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| New York                                                       |   | 26-6115117                        |
|----------------------------------------------------------------|--------|-----------------------------------|
| (State of incorporation or organization of the issuing entity) |   | (IRS Employer Identification No.) |

| One Wells Fargo Center301 S. College StreetCharlotte, North Carolina | 28288      | (212) 214-6277     |
|----------------------------------------------------------------------|------------|--------------------|
| (Address of principal executive offices)                             | (Zip Code) | (Telephone Number) |

| Title of Class                           |   | Name of  Registered Exchange                  |
|------------------------------------------|--------|----------------------------------------------------|
|                                     |   |                                               |
| STRATS  Certificates, Series 2006-3 |   | New York  Stock Exchange (“NYSE”) |

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| Large accelerated filer ☐ | Accelerated filer ☐ | Non-accelerated filer ☒ | Smaller Reporting Company ☐ |
|---------------------------------|---------------------------|-------------------------------|-----------------------------------|

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|   | Item 1. | Business. |
|--------|---------|-----------|

|  | Item IA. | Risk Factors. |
|--|----------|---------------|

|  | Item 2. | Properties. |
|--|---------|-------------|

|   | Item 3. | Legal Proceedings. |
|--------|---------|--------------------|

| Item 1B. | Unresolved Staff Comments. |
|----------|----------------------------|

| Item 4. | Mine Safety Disclosures. |
|---------|--------------------------|

| Item 9B. | Other Information. |
|----------|--------------------|

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| Item 15. | Exhibits, Financial Statement Schedules. |
|----------|------------------------------------------|

|  | (a) | List of Documents Filed as Part of this Report |
|--|-----|------------------------------------------------|

|  | (1) | Not Applicable. |
|--|-----|-----------------|

|  | (2) | Not Applicable. |
|--|-----|-----------------|

|  | (3) | See Item 15 (b), below. |
|--|-----|-------------------------|

|  | (b) | Exhibits Required by Item 601 of Regulation S-K. |
|--|-----|--------------------------------------------------|

| 31.1 | Rule 13a-14/15d-14 Certification (Section 302 Certification). |
|------|---------------------------------------------------------------|

| 33.1 | Report on Assessment of Compliance with Applicable Servicing Criteria of The Bank of New York Mellon for the year ended December 31, 2015. |
|------|--------------------------------------------------------------------------------------------------------------------------------------------|

| 34.1 | Independent Accountants’ Attestation Report concerning servicing activities of The Bank of New York Mellon for the year ended December 31, 2015. |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------|

| 35.1 | Compliance Statement of The Bank of New York Mellon for the year ended December 31, 2015. |
|------|-------------------------------------------------------------------------------------------|

|  | (c) | Omitted. |
|--|-----|----------|

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|                  | Synthetic Fixed-Income Securities, Inc. |
|-----------------------|-----------------------------------------|
|                  | (Depositor)                             |
|                  |                                    |   |
| Dated: March 30, 2016 | By:                                     | /s/  Barbara Garafalo |   |
|                  |                                    |    Barbara Garafalo |
|                  |                                    |    Vice President |
|                  |                                    | (senior officer of depositor in charge of securitization) |

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| EXHIBIT | DESCRIPTION                                                                                                                                            |
|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------|
|    |                                                                                                                                                   |
| 31.1    | Rule 13a-14/15d-14 Certification (Section 302 Certification).                                                                                          |
|    |                                                                                                                                                   |
| 33.1    | Report on Assessment of Compliance with Applicable Servicing Criteria of The Bank of New York Mellon for the year ended December 31, 2015.             |
|    |                                                                                                                                                   |
| 34.1    | Independent Accountants’ Attestation Report concerning servicing activities of The Bank of New York Mellon for the year ended December 31, 2015. |
|    |                                                                                                                                                   |
| 35.1    | Servicer Compliance Statement of The Bank of New York Mellon for the year ended December 31, 2015.                                                     |

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