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Ownership Document
|
| Schema Version: X0306 |
| Document Type: 4 |
| Period of Report: 12/10/13 |
| Not Subject to Section 16: 0 |
| Issuer: |
| Issuer CIK: 1529138 |
| Issuer Name: BlackRock Alternatives Allocation Master Portfolio LLC |
| Issuer Trading Symbol: BAAPMASTER |
| Reporting Owner: |
| Reporting Owner ID: |
| | Owner CIK: 1086364 |
| | Owner Name: BLACKROCK ADVISORS LLC |
| Reporting Owner Address: |
| | Owner Street 1: 55 EAST 52ND STREET |
| | Owner Street 2: |
| | Owner City: NEW YORK |
| | Owner State: NY |
| | Owner ZIP Code: 10055 |
| | Owner State Description: |
| Reporting Owner Relationship: |
| | Is Director? No |
| | Is Officer? No |
| | Is Ten Percent Owner? No |
| | Is Other? Yes |
| | Other Text: Investment Adviser |
| Non-Derivative Table: |
| Non-Derivative Transaction: |
| | Security Title: |
| | | Value: Limited Liability Company Units |
| | Transaction Date: |
| | | Value: 12/10/13 |
| | Deemed Execution Date: |
| | Transaction Coding: |
| | | Transaction Form Type: 4 |
| | | Transaction Code: J |
| | | Equity Swap Involved? No |
| | | Footnote ID: F1 |
| | Transaction Timeliness: |
| | | Value: |
| | Transaction Amounts: |
| | | Transaction Shares: |
| Value: 997.892 |
| | | Transaction Price Per Share: |
| Footnote ID: F1 |
| | | Transaction Acquired-Disposed Code: |
| Value: A |
| | Post-Transaction Amounts: |
| | | Shares Owned Following Transaction: |
| Value: 1,997.892 |
| | Ownership Nature: |
| | | Direct or Indirect Ownership: |
| Value: D |
| Footnotes: |
| Footnote - F1: Acquired as a result of a liquidating distribution by BlackRock Alternatives Allocation FB Portfolio LLC ("BAAP FB"). Amount of units received based on the Reporting Person's pro rata ownership of BAAP FB. |
| Remarks: |
| Owner Signature: |
| Signature Name: /s/ Janey Ahn, Director |
| Signature Date: 12/12/13 |
