SUB-INVESTMENT ADVISORY AGREEMENT

Exhibit 4(o)

SUB-INVESTMENT ADVISORY AGREEMENT

AGREEMENT dated September 24, 2012, between BlackRock Advisors, LLC, a Delaware limited liability company (the “Adviser”), and BlackRock (Singapore) Limited, a corporation organized under the laws of Singapore (the “Sub-Adviser”).

WHEREAS, the Adviser has agreed to furnish investment advisory services to the portfolios listed in Appendix A (each a “Portfolio”), each a series of BlackRock Funds II, a Massachusetts business trust (the “Trust”), an open-end management investment company registered under the Investment Company Act of 1940, as amended (the “1940 Act”);

WHEREAS, the Adviser wishes to retain the Sub-Adviser to provide it with certain sub- advisory services as described below in connection with Adviser’s advisory activities on behalf of the Portfolio;

WHEREAS, the advisory agreement between the Adviser and the Trust, dated May 31, 2007 and Addendum No. 1 thereto, dated January 30, 2008 (such agreement or the most recent successor agreement between such parties relating to advisory services to the Trust is referred to herein as the “Advisory Agreement”) contemplates that the Adviser may sub-contract investment advisory services with respect to the Portfolio to a sub-adviser; and

WHEREAS, the Sub-Adviser is willing to furnish such services upon the terms and conditions herein set forth.

NOW, THEREFORE, in consideration of the mutual premises and covenants herein contained and other good and valuable consideration, the receipt of which is hereby acknowledged, it is agreed by and between the parties hereto as follows:

1. Appointment. The Adviser hereby appoints the Sub-Adviser to act as sub-adviser with respect to the Portfolio and the Sub-Adviser accepts such appointment and agrees to render the services herein set forth for the compensation herein provided.

2. Services of the Sub-Adviser. Subject to the succeeding provisions of this section, the oversight and supervision of the Adviser and the direction and control of the Trust’s Board of Trustees, the Sub-Adviser will perform certain of the day-to-day operations of the Portfolio, which may include one or more of the following services, at the request of the Adviser: (a) acting as investment adviser for and managing the investment and reinvestment of those assets of the Portfolio as the Adviser may from time to time request and in connection therewith have complete discretion in purchasing and selling such securities and other assets for the Portfolio and in voting, exercising consents and exercising all other rights appertaining to such securities and other assets on behalf of the Portfolio; (b) arranging, subject to the provisions of paragraph 3 hereof, for the purchase and sale of securities and other assets of the Portfolio; (c) providing investment research and credit analysis concerning the Portfolio’s investments, (d) assisting the Adviser in determining what portion of the Portfolio’s assets will be invested in cash, cash equivalents and money market instruments, (e) placing orders for all purchases and sales of such investments made for the Portfolio, and (f) maintaining the books and records as are required to

support Portfolio investment operations. At the request of the Adviser, the Sub-Adviser will also, subject to the oversight and supervision of the Adviser and the direction and control of the Trust’s Board of Trustees, provide to the Adviser or the Portfolio any of the facilities and equipment and perform any of the services described in Section 4 of the Advisory Agreement. In addition, the Sub-Adviser will keep the Portfolio and the Adviser informed of developments materially affecting the Portfolio and shall, on its own initiative, furnish to the Portfolio from time to time whatever information the Sub-Adviser believes appropriate for this purpose. The Sub-Adviser will periodically communicate to the Adviser, at such times as the Adviser may direct, information concerning the purchase and sale of securities for the Portfolio, including: (a) the name of the issuer, (b) the amount of the purchase or sale, (c) the name of the broker or dealer, if any, through which the purchase or sale is effected, (d) the CUSIP number of the instrument, if any, and (e) such other information as the Adviser may reasonably require for purposes of fulfilling its obligations to the Portfolio under the Advisory Agreement. The Sub- Adviser will provide the services rendered by it under this Agreement in accordance with the Portfolio’s investment objectives, policies and restrictions (as currently in effect and as they may be amended or supplemented from time to time) as stated in the Portfolio’s Prospectus and Statement of Additional Information and the resolutions of the Trust’s Board of Trustees.

3. Covenants.

(a) In the performance of its duties under this Agreement, the Sub-Adviser shall at all times conform to, and act in accordance with, any requirements imposed by: (i) the provisions of the 1940 Act and the Investment Advisers Act of 1940, as amended (the “Advisers Act”), and all applicable Rules and Regulations of the Securities and Exchange Commission (the “SEC”); (ii) any other applicable provision of law; (iii) the provisions of the Declaration of Trust and By-Laws of the Trust, as such documents are amended from time to time; (iv) the investment objectives and policies of the Portfolio as set forth in the Portfolio’s Registration Statement on Form N-lA and/or the resolutions of the Board of Trustees; and (v) any policies and determinations of the Board of Trustees of the Trust; and

(b) In addition, the Sub-Adviser will:

(i) place orders either directly with the issuer or with any broker or dealer. Subject to the other provisions of this paragraph, in placing orders with brokers and dealers, the Sub-Adviser will attempt to obtain the best price and the most favorable execution of its orders. In placing orders, the Sub-Adviser will consider the experience and skill of the firm’s securities traders as well as the firm’s financial responsibility and administrative efficiency. Consistent with this obligation, the Sub-Adviser may select brokers on the basis of the research, statistical and pricing services they provide to the Portfolio and other clients of the Adviser or the Sub-Adviser. Information and research received from such brokers will be in addition to, and not in lieu of, the services required to be performed by the Sub-Adviser hereunder. A commission paid to such brokers may be higher than that which another qualified broker would have charged for effecting the same transaction, provided that the Sub-Adviser determines in good faith that such commission is reasonable in terms either of the transaction or the overall responsibility of the Adviser and the Sub-Adviser to the Portfolio and their other clients and that the total commissions paid by the Portfolio will be reasonable in relation to the benefits to the

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Portfolio over the long-term. Subject to the foregoing and the provisions of the 1940 Act, the Securities Exchange Act of 1934, as amended, and other applicable provisions of law, the Sub-Adviser may select brokers and dealers with which it or the Portfolio is affiliated;

(ii) maintain books and records with respect to the Portfolio’s securities transactions and will render to the Adviser and the Trust’s Board of Trustees such periodic and special reports as they may request;

(iii) maintain a policy and practice of conducting its investment advisory services hereunder independently of the commercial banking operations of its affiliates. When the Sub-Adviser makes investment recommendations for the Portfolio, its investment advisory personnel will not inquire or take into consideration whether the issuer of securities proposed for purchase or sale for the Portfolio’s account are customers of the commercial department of its affiliates; and

(iv) treat confidentially and as proprietary information of the Portfolio all records and other information relative to the Portfolio, and the Portfolio’s prior, current or potential shareholders, and will not use such records and information for any purpose other than performance of its responsibilities and duties hereunder, except after prior notification to and approval in writing by the Portfolio, which approval shall not be unreasonably withheld and may not be withheld where the Sub-Adviser may be exposed to civil or criminal contempt proceedings for failure to comply, when requested to divulge such information by duly constituted authorities, or when so requested by the Portfolio.

4. Services Not Exclusive. Nothing in this Agreement shall prevent the Sub-Adviser or any officer, employee or other affiliate thereof from acting as investment adviser for any other person, firm or corporation, or from engaging in any other lawful activity, and shall not in any way limit or restrict the Sub-Adviser or any of its officers, employees or agents from buying, selling or trading any securities for its or their own accounts or for the accounts of others for whom it or they may be acting; provided, however, that the Sub-Adviser will undertake no activities which, in its judgment, will adversely affect the performance of its obligations under this Agreement.

5. Books and Records. In compliance with the requirements of Rule 31a-3 under the 1940 Act, the Sub-Adviser hereby agrees that all records which it maintains for the Portfolio are the property of the Trust and further agrees to surrender promptly to the Trust any such records upon the Trust’s request. The Sub-Adviser further agrees to preserve for the periods prescribed by Rule 31a-2 under the 1940 Act the records required to be maintained by Rule 31a-1 under the 1940 Act (to the extent such books and records are not maintained by the Adviser).

6. Expenses. During the term of this Agreement, the Sub-Adviser will bear all costs and expenses of its employees and any overhead incurred by the Sub-Adviser in connection with its duties hereunder; provided that the Board of Trustees of the Trust may approve reimbursement to the Sub-Adviser of the pro-rata portion of the salaries, bonuses, health insurance, retirement benefits and all similar employment costs for the time spent on Portfolio operations (including, without limitation, compliance matters) (other than the provision of

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investment advice and administrative services required to be provided hereunder) of all personnel employed by the Sub-Adviser who devote substantial time to Portfolio operations or the operations of other investment companies advised or sub-advised by the Sub-Adviser.

7. Compensation.

(a) The Adviser agrees to pay to the Sub-Adviser and the Sub-Adviser agrees to accept as full compensation for all services rendered by the Sub-Adviser as such, a monthly fee in arrears at an annual rate equal to the amount set forth in Schedule A hereto. For any period less than a month during which this Agreement is in effect, the fee shall be prorated according to the proportion which such period bears to a full month of 28, 29, 30 or 31 days, as the case may be.

(b) For purposes of this Agreement, the net assets of the Portfolio shall be calculated pursuant to the procedures adopted by resolutions of the Trustees of the Trust for calculating the value of the Portfolio’s assets or delegating such calculations to third parties.

8. Limitation on Liability.

(a) The Sub-Adviser will not be liable for any error of judgment or mistake of law or for any loss suffered by the Adviser or by the Portfolio in connection with the performance of this Agreement, except a loss resulting from a breach of fiduciary duty with respect to the receipt of compensation for services or a loss resulting from willful misfeasance, bad faith or gross negligence on its part in the performance of its duties or from reckless disregard by it of its duties under this Agreement. As used in this Section 8(a), the term “Sub- Adviser” shall include any affiliates of the Sub-Adviser performing services for the Portfolio contemplated hereby and partners, directors, officers and employees of the Sub-Adviser and such affiliates.

(b) Notwithstanding anything to the contrary contained in this Agreement, the parties hereto acknowledge and agree that, as provided in Article Seven of the Declaration of Trust, this Agreement is executed by the Trustees and/or officers of the Trust, not individually but as such Trustees and/or officers of the Portfolio, and the obligations hereunder are not binding upon any of the Trustees or Shareholders individually but bind only the estate of the Portfolio.

9. Duration and Termination. This Agreement shall become effective with respect to a Portfolio as of the date set forth opposite such Portfolio on Appendix A and, unless sooner terminated with respect to the Portfolio as provided herein, shall continue in effect for a period of two years. Thereafter, if not terminated, this Agreement shall continue in effect with respect to the Portfolio for successive periods of 12 months, provided such continuance is specifically approved at least annually by both (a) the vote of a majority of the Trust’s Board of Trustees or a vote of a majority of the outstanding voting securities of the Portfolio at the time outstanding and entitled to vote and (b) by the vote of a majority of the Trustees, who are not parties to this Agreement or interested persons (as such term is defined in the 0000 Xxx) of any such party, cast in person at a meeting called for the purpose of voting on such approval. Notwithstanding the foregoing, this Agreement may be terminated by a Portfolio or the Adviser at any time, without

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the payment of any penalty, upon giving the Sub-Adviser 60 days’ notice (which notice may be waived by the Sub-Adviser), provided that such termination by the Portfolio or the Adviser shall be directed or approved by the vote of a majority of the Trustees of the Trust in office at the time or by the vote of the holders of a majority of the outstanding voting securities of the Portfolio entitled to vote, or by the Sub-Adviser on 60 days’ written notice (which notice may be waived by the Portfolio and the Adviser), and will terminate automatically upon any termination of the Advisory Agreement between the Trust and the Adviser. This Agreement will also immediately terminate in the event of its assignment. (As used in this Agreement, the terms “majority of the outstanding voting securities,” “interested person” and “assignment” shall have the same meanings of such terms in the 1940 Act.)

10. Notices. Any notice under this Agreement shall be in writing to the other party at such address as the other party may designate from time to time for the receipt of such notice and shall be deemed to be received on the earlier of the date actually received or on the fourth day after the postmark if such notice is mailed first class postage prepaid.

11. Amendment of this Agreement. This Agreement may be amended by the parties only if such amendment is specifically approved by the vote of the Board of Trustees of the Trust, including a majority of those Trustees who are not parties to this Agreement or interested persons of any such party cast in person at a meeting called for the purpose of voting on such approval and, where required by the 1940 Act, by a vote of a majority of the outstanding voting securities of the Portfolio.

12. Miscellaneous. The captions in this Agreement are included for convenience of reference only and in no way define or delimit any of the provisions hereof or otherwise affect their construction or effect. If any provision of this Agreement shall be held or made invalid by a court decision, statute, rule or otherwise, the remainder of this Agreement shall not be affected thereby. This Agreement shall be binding on, and shall inure to the benefit of the parties hereto and their respective successors.

13. Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of New York for contracts to be performed entirely therein without reference to choice of law principles thereof and in accordance with the applicable provisions of the 1940 Act. To the extent that the applicable laws of the State of New York, or any of the provisions, conflict with the applicable provisions of the 1940 Act, the latter shall control.

14. Counterparts. This Agreement may be executed in counterparts by the parties hereto, each of which shall constitute an original counterpart, and all of which, together, shall constitute one Agreement.

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IN WITNESS WHEREOF, the parties hereto have caused this instrument to be executed by their duly authorized officers designated below as of the day and year first above written.

BLACKROCK ADVISORS, LLC

By:

Name: Xxxx X. Xxxxxxx

Title: Managing Director

BLACKROCK (SINGAPORE) LIMITED

By:

Name:

Title:

By:

Name:

Title:

AGREED AND ACCEPTED

as of the date first set forth above

BLACKROCK FUNDS II

By:

Name: Xxxx Xxxxxxxxx

Title: President and Chief Executive Officer

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Appendix A

Xxxxx of Series		Effective Date
BlackRock Multi-Asset Income Portfolio		September 24, 2012
BlackRock Strategic Income Opportunities Portfolio		September 24, 2012

Schedule A

Sub-Investment Advisory Fee

Pursuant to Section 7, for that portion of the Portfolio for which the Sub-Adviser acts as sub- adviser, Adviser shall pay a fee to Sub-Adviser equal to forty-six percent (46%) of the advisory fee received by the Adviser from the Portfolio with respect to such portion, net of: (i) expense waivers and reimbursements, (ii) expenses relating to distribution and sales support activities borne by the Adviser, and (iii) administrative, networking, recordkeeping, sub-transfer agency and shareholder services expenses borne by the Adviser.