EX-10.1





 Exhibit 10.1 

FORM OF SUBSCRIPTION AGREEMENT 

This SUBSCRIPTION AGREEMENT (this “Subscription Agreement”) is entered into this 15th day of July, 2020, by and between
Fortress Value Acquisition Corp., a Delaware corporation (the “Company”), and the undersigned (“Subscriber” or “you”). Defined terms used but not otherwise defined herein shall have the respective
meanings ascribed thereto in the Transaction Agreement (as defined below). 
 WHEREAS, the Company and the other parties named therein
entered into that certain Transaction Agreement, dated as of July 15, 2020 (the “Transaction Agreement”), pursuant to which the Company will acquire MP Mine Operations LLC d/b/a MP Materials and Secure Natural Resources LLC, on
the terms and subject to the conditions set forth therein (the “Transaction”); 
 WHEREAS, in connection with the
Transaction, Subscriber desires to subscribe for and purchase from the Company that number of the Company’s Class A common stock, par value $0.0001 per share (the “Common Stock”), set forth on the signature page hereto
(the “Shares”) for a purchase price of $10.00 per share (the “Per Share Price”), or the aggregate purchase price set forth on the signature page hereto (the “Purchase Price”), and the Company
desires to issue and sell to Subscriber the Shares in consideration of the payment of the Purchase Price by or on behalf of Subscriber to the Company on or prior to the Closing (as defined below); and 

WHEREAS, in connection with the Transaction, certain other “accredited investors” (within the meaning of Rule 501(a) under the
Securities Act of 1933, as amended (the “Securities Act”)) have entered into separate subscription agreements with the Company, pursuant to which such investors have, together with the Subscriber pursuant to this Subscription
Agreement, agreed to purchase an aggregate of 20,000,000 shares of Common Stock at the Per Share Price. 
 NOW, THEREFORE, in consideration
of the foregoing and the mutual representations, warranties and covenants, and subject to the conditions, herein contained, and intending to be legally bound hereby, the parties hereto hereby agree as follows: 

1. Subscription. Subject to the terms and conditions hereof, Subscriber hereby agrees to subscribe for and purchase, and the Company
hereby agrees to issue and sell to Subscriber, upon the payment of the Purchase Price, the Shares (such subscription and issuance, the “Subscription”). 

2. Representations, Warranties and Agreements. 

2.1 Subscriber’s Representations, Warranties and Agreements. To induce the Company to issue the Shares to Subscriber, Subscriber
hereby represents and warrants to the Company and agrees with the Company as follows: 
 2.1.1 If Subscriber is not an individual,
Subscriber has been duly formed or incorporated and is validly existing in good standing under the laws of its jurisdiction of incorporation or formation, with power and authority to enter into, deliver and perform its obligations under this
Subscription Agreement. If Subscriber is an individual, Subscriber has the authority to enter into, deliver and perform its obligations under this Subscription Agreement. 












 2.1.2 If Subscriber is not an individual, this Subscription Agreement has been duly
authorized, executed and delivered by Subscriber. If Subscriber is an individual, the signature on this Subscription Agreement is genuine, and Subscriber has legal competence and capacity to execute the same. This Subscription Agreement is
enforceable against Subscriber in accordance with its terms, except as may be limited or otherwise affected by (i) bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium or other laws relating to or affecting the rights of
creditors generally, and (ii) principles of equity, whether considered at law or equity. 
 2.1.3 The execution, delivery and
performance by Subscriber of this Subscription Agreement and the consummation of the transactions contemplated herein will not (i) conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default
under, or result in the creation or imposition of any lien, charge or encumbrance upon any of the property or assets of Subscriber or any of its subsidiaries pursuant to the terms of any indenture, mortgage, deed of trust, loan agreement, lease,
license or other agreement or instrument to which Subscriber or any of its subsidiaries is a party or by which Subscriber or any of its subsidiaries is bound or to which any of the property or assets of Subscriber or any of its subsidiaries is
subject, which would reasonably be expected to have a material adverse effect on the business, properties, financial condition, stockholders’ equity or results of operations of Subscriber and its subsidiaries, taken as a whole (a
“Subscriber Material Adverse Effect”), or materially affect the legal authority of Subscriber to comply in all material respects with the terms of this Subscription Agreement; (ii) if Subscriber is not an individual, result in
any violation of the provisions of the organizational documents of Subscriber or any of its subsidiaries; or (iii) result in any violation of any statute or any judgment, order, rule or regulation of any court or governmental agency or body,
domestic or foreign, having jurisdiction over Subscriber or any of its subsidiaries or any of their respective properties that would reasonably be expected to have a Subscriber Material Adverse Effect or materially affect the legal authority of
Subscriber to comply in all material respects with this Subscription Agreement. 
 2.1.4 Subscriber (i) is a “qualified
institutional buyer” (as defined in Rule 144A under the Securities Act) or an “accredited investor” (within the meaning of Rule 501(a) under the Securities Act) satisfying the applicable requirements set forth on Schedule A,
(ii) is acquiring the Shares only for its own account and not for the account of others, or if Subscriber is subscribing for the Shares as a fiduciary or agent for one or more investor accounts, each owner of such account is an accredited
investor and Subscriber has full investment discretion with respect to each such account, and the full power and authority to make the acknowledgements, representations and agreements herein on behalf of each owner of each such account, and
(iii) is not acquiring the Shares with a view to, or for offer or sale in connection with, any distribution thereof in violation of the Securities Act (and shall provide the requested information on Schedule A following the signature
page hereto). Subscriber is not an entity formed for the specific purpose of acquiring the Shares. Subscriber understands and acknowledges that the purchase of the Shares pursuant to this Agreement meets the exemptions from filing under FINRA Rule
5123(b)(1)(C) or (J). 

  
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 2.1.5 Subscriber understands that the Shares are being offered in a transaction not
involving any public offering within the meaning of the Securities Act and that the Shares have not been registered under the Securities Act. Subscriber understands that the Shares may not be resold, transferred, pledged or otherwise disposed of by
Subscriber absent an effective registration statement under the Securities Act with respect to the Shares or an opinion of counsel satisfactory to the Company that such registration statement is not required and an applicable exemption from the
registration requirements of the Securities Act is available, and that any certificates or book entries representing the Shares shall contain a legend to such effect. Subscriber acknowledges that the Shares will not be eligible for resale pursuant
to Rule 144A promulgated under the Securities Act. Subscriber understands and agrees that the Shares will be subject to transfer restrictions and, as a result of these transfer restrictions, Subscriber may not be able to readily resell the Shares
and may be required to bear the financial risk of an investment in the Shares for an indefinite period of time. Subscriber understands that it has been advised to consult legal counsel prior to making any offer, resale, pledge or transfer of any of
the Shares. 
 2.1.6 Subscriber understands and agrees that Subscriber is purchasing the Shares directly from the Company. Subscriber
further acknowledges that there have been no representations, warranties, covenants and agreements made to Subscriber by the Company or any of its officers or directors, expressly or by implication, other than those representations, warranties,
covenants and agreements included in this Subscription Agreement. 
 2.1.7 Subscriber represents and warrants that (i) it is not a
Benefit Plan Investor as contemplated by the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), or (ii) its acquisition and holding of the Shares will not constitute or result in a non-exempt prohibited transaction under Section 406 of the Employee Retirement Income Security Act of 1974, as amended, Section 4975 of the Internal Revenue Code of 1986, as amended, or any applicable
similar law. 
 2.1.8 In making its decision to purchase the Shares, Subscriber represents that it has relied solely upon independent
investigation made by Subscriber. The Subscriber acknowledges and agrees that the Subscriber has received and has had an adequate opportunity to review, such financial and other information as the Subscriber deems necessary in order to make an
investment decision with respect to the Shares and made its own assessment and is satisfied concerning the relevant tax and other economic considerations relevant to the Subscriber’s investment in the Shares. Without limiting the generality of
the foregoing, the Subscriber acknowledges that it has reviewed the documents provided to the Subscriber by the Company. The Subscriber represents and agrees that the Subscriber and the Subscriber’s professional advisor(s), if any, have had the
full opportunity to ask such questions, receive such answers and obtain such information as the Subscriber and such Subscriber’s professional advisor(s), if any, have deemed necessary to make an investment decision with respect to the Shares.
The Subscriber acknowledges that no disclosure or any information received by the Subscriber has been prepared by any of Morgan Stanley & Co. LLC, Deutsche Bank Securities Inc. and/or RBC Capital Markets, LLC (collectively, the
“Placement Agents”) and that the Placement Agents and their respective directors, officers, employees, representatives and controlling persons have made no independent investigation with respect to the Company or the Shares or the
accuracy, completeness or adequacy of any information supplied to the Subscriber by the Company. The Subscriber acknowledges that it has not relied on any statements or other information provided by the Placement Agents or any


  
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of the Placement Agents’ affiliates with respect to its decision to invest in the Shares, including information related to the Company, the Shares and the offer and sale of the Shares. the
information provided to the Subscriber is preliminary and subject to change, and that any changes to such information, including, without limitation, any changes based on updated information or changes in terms of the Transaction, shall in no way
affect the Subscriber’s obligation to purchase the Shares hereunder. 
 2.1.9 Subscriber became aware of this offering of the Shares
solely by means of direct contact from the Placement Agents or directly from the Company as a result of a pre-exiting, substantial relationship with the Company, and the Shares were offered to Subscriber
solely by direct contact between Subscriber and any of the Placement Agents or the Company. Subscriber did not become aware of this offering of the Shares, nor were the Shares offered to Subscriber, by any other means. Subscriber acknowledges that
the Placement Agents have not acted as its financial advisor or fiduciary. Subscriber acknowledges that the Company represents and warrants that the Shares (i) were not offered by any form of general solicitation or general advertising and
(ii) are not being offered in a manner involving a public offering under, or in a distribution in violation of, the Securities Act, or any state securities laws. 

2.1.10 Subscriber acknowledges that it is aware that there are substantial risks incident to the purchase and ownership of the Shares.
Subscriber has such knowledge and experience in financial and business matters as to be capable of evaluating the merits and risks of an investment in the Shares, and Subscriber has sought such accounting, legal and tax advice as Subscriber has
considered necessary to make an informed investment decision. Subscriber understands and acknowledges that the purchase and sale of the Shares hereunder meets (i) the exemptions from filing under FINRA Rule 5123(b)(1)(A) and (ii) the
institutional customer exemption under FINRA Rule 2111(b). 
 2.1.11 Alone, or together with any professional advisor(s), Subscriber
represents and acknowledges that Subscriber has such knowledge and experience in financial and business matters as to be capable of evaluating the merits and risks of the investment in the Shares, has adequately analyzed and fully considered the
risks of an investment in the Shares and determined that the Shares are a suitable investment for Subscriber and that Subscriber is able at this time and in the foreseeable future to bear the economic risk of a total loss of Subscriber’s
investment in the Company. Subscriber further acknowledges specifically that a possibility of total loss of investment exists and that it is able to fend for itself in the transactions contemplated herein. 

2.1.12 Subscriber understands and agrees that no federal or state agency has passed upon or endorsed the merits of the offering of the Shares
or made any findings or determination as to the fairness of this investment. 
 2.1.13 Subscriber represents and warrants that Subscriber is
not (i) a person or entity named on the List of Specially Designated Nationals and Blocked Persons administered by the U.S. Treasury Department’s Office of Foreign Assets Control (“OFAC”) or in any Executive Order issued
by the President of the United States and administered by OFAC (“OFAC List”), or a person or entity prohibited by any OFAC sanctions program, (ii) a Designated National as defined in the Cuban Assets Control Regulations, 31
C.F.R. Part 515, or (iii) a non-U.S. shell bank or providing banking services indirectly to a non-U.S. shell bank (collectively, a “Prohibited 


  
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Investor”). Subscriber agrees to provide law enforcement agencies, if requested thereby, such records as required by applicable law, provided that Subscriber is permitted to do so
under applicable law. Subscriber represents that if it is a financial institution subject to the Bank Secrecy Act (31 U.S.C. Section 5311 et seq.) (the “BSA”), as amended by the USA PATRIOT Act of 2001 (the “PATRIOT
Act”), and its implementing regulations (collectively, the “BSA/PATRIOT Act”), that Subscriber maintains policies and procedures reasonably designed to comply with applicable obligations under the BSA/PATRIOT Act.
Subscriber also represents that, to the extent required, it maintains policies and procedures reasonably designed for the screening of its investors against the OFAC sanctions programs, including the OFAC List. Subscriber further represents and
warrants that, to the extent required, it maintains policies and procedures reasonably designed to ensure that the funds held by Subscriber and used to purchase the Shares were legally derived. 

2.1.14 Subscriber has, and at the Closing will have, sufficient funds to pay the Purchase Price pursuant to Section 3.1. 

2.1.15 Subscriber represents that no disqualifying event described in Rule 506(d)(1)(i)-(viii) under the Securities Act (a
“Disqualification Event”) is applicable to Subscriber or any of its Rule 506(d) Related Parties (as defined below), except, if applicable, for a Disqualification Event as to which Rule 506(d)(2)(ii) or (iii) or (d)(3) is
applicable. Subscriber hereby agrees that it shall notify the Company promptly in writing in the event a Disqualification Event becomes applicable to Subscriber or any of its Rule 506(d) Related Parties, except, if applicable, for a Disqualification
Event as to which Rule 506(d)(2)(ii) or (iii) or (d)(3) is applicable. For purposes of this Section 2.1.15, “Rule 506(d) Related Party” shall mean a person or entity that is a direct beneficial owner of Subscriber’s
securities for purposes of Rule 506(d) under the Securities Act. 
 2.2 Company’s Representations, Warranties and Agreements. To
induce Subscriber to purchase the Shares, the Company hereby represents and warrants to Subscriber and agrees with Subscriber as follows: 

2.2.1 The Company has been duly incorporated and is validly existing as a corporation in good standing under the Delaware General Corporation
Law (the “DGCL”), with corporate power and authority to own, lease and operate its properties and conduct its business as presently conducted and to enter into, deliver and perform its obligations under this Subscription Agreement.

 2.2.2 The Shares have been duly authorized and, when issued and delivered to Subscriber against full payment for the Shares in accordance
with the terms of this Subscription Agreement and registered with the Company’s transfer agent, the Shares will be validly issued, fully paid and non-assessable and the Shares will not have been
authorized in violation of or subject to any preemptive or similar rights created under the Company’s amended and restated certificate of incorporation or under the DGCL. 

2.2.3 This Subscription Agreement has been duly authorized, executed and delivered by the Company and is enforceable against it in accordance
with its terms, except as may be limited or otherwise affected by (i) bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium or other laws relating to or affecting the rights of creditors generally, and (ii) principles
of equity, whether considered at law or equity. 

  
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 2.2.4 The execution, delivery and performance of this Subscription Agreement (including
compliance by the Company with all of the provisions hereof), issuance and sale of the Shares and the consummation of the certain other transactions contemplated herein will not conflict with or result in a breach or violation of any of the terms or
provisions of, or constitute (i) a default under, or result in the creation or imposition of any lien, charge or encumbrance upon any of the property or assets of the Company pursuant to the terms of any indenture, mortgage, deed of trust, loan
agreement, lease, license or other agreement or instrument to which the Company is a party or by which the Company is bound or to which any of the property or assets of the Company is subject, which would reasonably be expected to have a material
adverse effect on the business, properties, financial condition, stockholders’ equity or results of operations of the Company (a “Material Adverse Effect”) or materially affect the validity of the Shares or the legal authority
of the Company to comply in all material respects with the terms of this Subscription Agreement; (ii) result in any violation of the provisions of the organizational documents of the Company; or (iii) result in any violation of any statute
or any judgment, order, rule or regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over the Company or any of its properties that would reasonably be expected to have a Material Adverse Effect or
materially affect the validity of the Shares or the legal authority of the Company to comply in all material respects with this Subscription Agreement. 

2.2.5 Neither the Company, nor any person acting on its or their behalf has, directly or indirectly, made any offers or sales of any Company
security or solicited any offers to buy any security, under circumstances that would adversely affect reliance by the Company on Section 4(a)(2) of the Securities Act for the exemption from registration for the transactions contemplated hereby
or would require registration of the Shares under the Securities Act. 
 2.2.6 Neither the Company nor any person acting on its behalf has
conducted any general solicitation or general advertising (as those terms are used in Regulation D under the Securities Act) in connection with the offer or sale of any of the Shares. 

2.2.7 The Company has provided Subscriber an opportunity to ask questions regarding the Company and made available to Subscriber all the
information reasonably available to the Company that Subscriber has requested for deciding whether to acquire the Shares. 
 2.2.8 No
Disqualification Event is applicable to the Company or, to the Company’s knowledge, any Company Covered Person (as defined below), except for a Disqualification Event as to which Rule 506(d)(2)(ii)-(iv) or (d)(3) under the Securities Act is
applicable. The Company has complied, to the extent applicable, with any disclosure obligations under Rule 506(e) under the Securities Act. “Company Covered Person” means, with respect to the Company as an “issuer” for
purposes of Rule 506 under the Securities Act, any person listed in the first paragraph of Rule 506(d)(1) under the Securities Act. 

  
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 3. Settlement Date and Delivery. 

3.1 Closing. The closing of the Subscription contemplated hereby (the “Closing”) is contingent upon the substantially
concurrent consummation of the Transaction. The Closing shall occur on the closing date of the Transaction. Upon not less than three (3) business days’ written notice from (or on behalf of) the Company to Subscriber (the “Closing
Notice”) that the Company reasonably expects all conditions to the closing of the Transaction to be satisfied on a date that is not less than three (3) business days from the date of the Closing Notice, Subscriber shall deliver to the
Company at least one (1) business day prior to the closing date specified in the Closing Notice (the “Closing Date”), to be held in escrow until the Closing, the Purchase Price for the Shares by wire transfer of United States
dollars in immediately available funds to the account specified by the Company in the Closing Notice against delivery by the Company to Subscriber of the Shares in book-entry form. In the event the Closing does not occur on the Closing Date, the
Company shall promptly (but not later than two (2) business days thereafter) return the Purchase Price to Subscriber. 
 3.2
Conditions to Closing. 
 The Closing shall be subject to the conditions that, on the Closing Date: 

3.2.1 No suspension of the qualification of the Shares for offering or sale or trading in any jurisdiction, or initiation or threatening of
any proceedings for any of such purposes, shall have occurred. 
 3.2.2 All representations and warranties of the Company and Subscriber
contained in this Subscription Agreement shall be true and correct in all material respects as of the Closing Date, and consummation of the Closing shall constitute a reaffirmation by Subscriber of each of the representations, warranties and
agreements contained in this Subscription Agreement as of the Closing Date. 
 3.2.3 The Company and the Subscriber shall have performed or
complied in all material respects with all agreements and covenants required by this Subscription Agreement. 
 3.2.4 No governmental
authority shall have enacted, issued, promulgated, enforced or entered any judgment, order, rule or regulation (whether temporary, preliminary or permanent) which is then in effect and has the effect of making consummation of the transactions
contemplated hereby illegal or otherwise preventing or prohibiting consummation of the transactions contemplated hereby. 
 3.2.5 All
conditions precedent to the consummation of the Transaction set forth in the Transaction Agreement shall have been satisfied or waived (other than those conditions that, by their nature, may only be satisfied at the consummation of the Transaction,
but subject to satisfaction of such conditions as of the consummation of the Transaction). 
 3.2.6 All specified waiting periods under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, shall have expired or been terminated. 

  
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 4. Registration Rights. 

4.1 The Company and Subscriber agree that, within fifteen (15) business days after the consummation of the Transaction, the Company will
file with the U.S. Securities and Exchange Commission (the “SEC”) a registration statement registering the resale of the Shares (the “Registration Statement”), and the Company shall use its commercially reasonable
efforts to have the Registration Statement declared effective as soon as practicable after the filing thereof; provided, however, that the Company’s obligations to include the Shares and those other Shares of the Company held by Subscriber in
the Registration Statement are contingent upon Subscriber furnishing in writing to the Company such information regarding Subscriber, the securities of the Company held by Subscriber and the intended method of disposition of the Shares as shall be
reasonably requested by the Company to effect the registration of the Shares, and shall execute such documents in connection with such registration as the Company may reasonably request that are customary of a selling stockholder in similar
situations. The Company shall use its commercially reasonable efforts to maintain the continuous effectiveness of the Registration Statement until the earliest of (i) the date on which the Shares may be resold without volume or manner of sale
limitations pursuant to Rule 144 promulgated under the Securities Act (“Rule 144”), (ii) the date on which such Shares have actually been sold and (iii) the date which is two years after the Closing. 

4.2 Notwithstanding anything to the contrary in this Subscription Agreement, the Company shall be entitled to delay or postpone the
effectiveness of the Registration Statement, and from time to time to require any Subscriber not to sell under the Registration Statement or to suspend the effectiveness thereof, if the negotiation or consummation of a transaction by the Company or
its subsidiaries is pending or an event has occurred, which negotiation, consummation or event, the Company’s board of directors reasonably believes, upon the advice of legal counsel, would require additional disclosure by the Company in the
Registration Statement of material information that the Company has a bona fide business purpose for keeping confidential and the non-disclosure of which in the Registration Statement would be expected, in the
reasonable determination of the Company’s board of directors, upon the advice of legal counsel, to cause the Registration Statement to fail to comply with applicable disclosure requirements (each such circumstance, a “Suspension
Event”); provided, however, that the Company may not delay or suspend the Registration Statement on more than two occasions or for more than sixty (60) consecutive calendar days, or more than ninety (90) total
calendar days, in each case during any twelve-month period. Upon receipt of any written notice from the Company of the happening of any Suspension Event (which notice shall not contain material non-public
information) during the period that the Registration Statement is effective or if as a result of a Suspension Event the Registration Statement or related prospectus contains any untrue statement of a material fact or omits to state any material fact
required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made (in the case of the prospectus) not misleading, each Subscriber agrees that (i) it will immediately discontinue
offers and sales of the Shares under the Registration Statement (excluding, for the avoidance of doubt, sales conducted pursuant to Rule 144) until such Subscriber receives copies of a supplemental or amended prospectus (which the Company
agrees to promptly prepare) that corrects the misstatement(s) or omission(s) referred to above and receives notice that any post-effective amendment has become effective or unless otherwise notified by the Company that it may resume such offers and
sales, and (ii) it will maintain the confidentiality of any information included in 

  
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such written notice delivered by the Company unless otherwise required by law or subpoena. If so directed by the Company, each Subscriber will deliver to the Company or, in such Subscriber’s
sole discretion destroy, all copies of the prospectus covering the Shares in such Subscriber’s possession; provided, however, that this obligation to deliver or destroy all copies of the prospectus covering the Shares shall not
apply (i) to the extent such Subscriber is required to retain a copy of such prospectus (a) in order to comply with applicable legal, regulatory, self-regulatory or professional requirements or (b) in accordance with a bona fide pre-existing document retention policy or (ii) to copies stored electronically on archival servers as a result of automatic data back-up. 

4.3 The Company shall, notwithstanding any termination of this Subscription Agreement, indemnify, defend and hold harmless each Subscriber (to
the extent a seller under the Registration Statement), the officers, directors and agents of each of them, and each person who controls such Subscriber (within the meaning of Section 15 of the Securities Act or Section 20 of the Securities
Exchange Act of 1934, as amended (the “Exchange Act”)) to the fullest extent permitted by applicable law, from and against any and all losses, claims, damages, liabilities, costs (including, without limitation, reasonable
attorneys’ fees) and expenses (collectively, “Losses”), as incurred, that arise out of or are based upon (i) any untrue or alleged untrue statement of a material fact contained in the Registration Statement, any prospectus
included in the Registration Statement or any form of prospectus or in any amendment or supplement thereto or in any preliminary prospectus, or arising out of or relating to any omission or alleged omission to state a material fact required to be
stated therein or necessary to make the statements therein (in the case of any prospectus or form of prospectus or supplement thereto, in light of the circumstances under which they were made) not misleading, or (ii) any violation or alleged
violation by the Company of the Securities Act, Exchange Act or any state securities law or any rule or regulation thereunder, in connection with the performance of its obligations under this Section 4, except to the extent, but only to the
extent, that such untrue statements, alleged untrue statements, omissions or alleged omissions are based upon information regarding such Subscriber furnished in writing to the Company by such Subscriber expressly for use therein or such Subscriber
has omitted a material fact from such information or otherwise violated the Securities Act, Exchange Act or any state securities law or any rule or regulation thereunder; provided, however, that the indemnification contained in this
Section 4 shall not apply to amounts paid in settlement of any Losses if such settlement is effected without the consent of the Company (which consent shall not be unreasonably withheld, conditioned or delayed), nor shall the Company be liable
for any Losses to the extent they arise out of or are based upon a violation which occurs (A) in reliance upon and in conformity with written information furnished by a Subscriber, (B) in connection with any failure of such person to
deliver or cause to be delivered a prospectus made available by the Company in a timely manner, (C) as a result of offers or sales effected by or on behalf of any person by means of a “free writing prospectus” (as defined in
Rule 405 under the Securities Act) that was not authorized in writing by the Company, or (D) in connection with any offers or sales effected by or on behalf of a Subscriber in violation of Section 4.2 hereof. The Company shall notify
such Subscriber promptly of the institution, threat or assertion of any proceeding arising from or in connection with the transactions contemplated by this Section 4 of which the Company is aware. Such indemnity shall remain in full force and
effect regardless of any investigation made by or on behalf of an indemnified party and shall survive the transfer of the Shares by such Subscriber. 

  
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 4.4 Each Subscriber shall, severally and not jointly, indemnify and hold harmless the
Company, its directors, officers, agents and employees, and each person who controls the Company (within the meaning of Section 15 of the Securities Act and Section 20 of the Exchange Act), to the fullest extent permitted by applicable
law, from and against all Losses, as incurred, arising out of or are based upon any untrue or alleged untrue statement of a material fact contained in any Registration Statement, any prospectus included in the Registration Statement, or any form of
prospectus, or in any amendment or supplement thereto or in any preliminary prospectus, or arising out of or relating to any omission or alleged omission of a material fact required to be stated therein or necessary to make the statements therein
(in the case of any prospectus, or any form of prospectus or supplement thereto, in light of the circumstances under which they were made) not misleading to the extent, but only to the extent, that such untrue statements or omissions are based upon
information regarding such Subscriber furnished in writing to the Company by such Subscriber expressly for use therein; provided, however, that the indemnification contained in this Section 4 shall not apply to amounts paid in
settlement of any Losses if such settlement is effected without the consent of such Subscriber (which consent shall not be unreasonably withheld, conditioned or delayed). In no event shall the liability of any Subscriber be greater in amount than
the dollar amount of the net proceeds received by such Subscriber upon the sale of the Shares giving rise to such indemnification obligation. Each Subscriber shall notify the Company promptly of the institution, threat or assertion of any proceeding
arising from or in connection with the transactions contemplated by this Section 4 of which such Subscriber is aware. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of an indemnified
party and shall survive the transfer of the Shares by such Subscriber. 
 5. Termination. This Subscription Agreement shall terminate
and be void and of no further force and effect, and all rights and obligations of the parties hereunder shall terminate without any further liability on the part of any party in respect thereof, upon the earlier to occur of (i) such date and
time as the Transaction Agreement is terminated in accordance with its terms, (ii) upon the mutual written agreement of each of the parties hereto to terminate this Subscription Agreement or (iii) if any of the conditions to Closing set
forth in Section 3.2 of this Subscription Agreement are not satisfied or waived on or prior to the Closing and, as a result thereof, the transactions contemplated by this Subscription Agreement are not consummated at the Closing;
provided, that, subject to the limitations set forth in Section 8, nothing herein will relieve any party from liability for any willful breach hereof prior to the time of termination, and each party will be entitled to any remedies at
law or in equity to recover losses, liabilities or damages arising from such breach. The Company shall promptly notify Subscriber of the termination of the Transaction Agreement promptly after the termination of such agreement. 

6. Miscellaneous. 
 6.1
Further Assurances. At the Closing, the parties hereto shall execute and deliver such additional documents and take such additional actions as the parties reasonably may deem to be practical and necessary in order to consummate the
Subscription as contemplated by this Subscription Agreement. 

  
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 6.1.1 Subscriber acknowledges that the Company, the Placement Agents and others will rely
on the acknowledgments, understandings, agreements, representations and warranties contained in this Subscription Agreement. Prior to the Closing, Subscriber agrees to promptly notify the Company if any of the acknowledgments, understandings,
agreements, representations and warranties set forth herein are no longer accurate in all material respects. Subscriber further acknowledges and agrees that the Placement Agents are third-party beneficiaries of the representations and warranties of
the Subscriber contained in Section 2.1 of this Subscription Agreement. 
 6.1.2 The Company is entitled to rely upon this Subscription
Agreement and is irrevocably authorized to produce this Subscription Agreement or a copy hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby. 

6.1.3 The Company may request from Subscriber such additional information as the Company may deem necessary to evaluate the eligibility of
Subscriber to acquire the Shares, and Subscriber shall provide such information as may be reasonably requested, to the extent readily available and to the extent consistent with its internal policies and procedures. 

6.1.4 Subscriber shall pay all of its own expenses in connection with this Subscription Agreement and the transactions contemplated herein.

 6.2 Notices. Any notice or communication required or permitted hereunder shall be in writing and either delivered personally,
emailed or sent by overnight mail via a reputable overnight carrier, or sent by certified or registered mail, postage prepaid, and shall be deemed to be given and received (i) when so delivered personally, (ii) when sent, with no mail
undeliverable or other rejection notice, if sent by email, or (iii) three (3) business days after the date of mailing to the address below or to such other address or addresses as such person may hereafter designate by notice given hereunder:

 (i) if to Subscriber, to such address or addresses set forth on the signature page hereto; 

(ii) if to the Company (prior to the Transaction closing), to: 

Fortress Value Acquisition Corp. 

1345 Avenue of the Americas, 46th Floor 

New York, New York 10105 

Attention:     Alexander Gillette 

Email:           agillette@fortress.com 

with a required copy to (which copy shall not constitute notice): 

Weil, Gotshal & Manges LLP 

767 Fifth Avenue 
 New York, New
York 10153 
 Attention:     Jackie Cohen 

Email:           jackie.cohen@weil.com 

  
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 (iii) if to the Company (following the Transaction closing), to: 

MP Mine Operations LLC d/b/a MP Materials 

6720 Via Austi Parkway, Suite 450 

Las Vegas, Nevada 89119 

Attention:     Sheila Bangalore, General Counsel 

Email:           sbangalore@mpmaterials.com 

with a required copy to (which copy shall not constitute notice): 

Sidley Austin LLP 
 One South
Dearborn Street 
 Chicago, Illinois 60603 

Attention:     Michael Heinz 

Email:           mheinz@sidley.com 

6.3 Entire Agreement. This Subscription Agreement constitutes the entire agreement, and supersedes all other prior agreements,
understandings, representations and warranties, both written and oral, among the parties, with respect to the subject matter hereof. Except as otherwise expressly set forth in Section 6.1.1, this Subscription Agreement shall not confer rights
or remedies upon any person other than the parties hereto and their respective successors and assigns. 
 6.4 Modifications and
Amendments. This Subscription Agreement may not be modified, waived or terminated except by an instrument in writing, signed by the party against whom enforcement of such modification, waiver, or termination is sought. 

6.5 Waivers and Consents. The terms and provisions of this Subscription Agreement may be waived, or consent for the departure therefrom
granted, only by a written document executed by the party entitled to the benefits of such terms or provisions. No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect to any other terms or provisions of
this Subscription Agreement, whether or not similar. Each such waiver or consent shall be effective only in the specific instance and for the purpose for which it was given, and shall not constitute a continuing waiver or consent. 

6.6 Assignment. Neither this Subscription Agreement nor any rights that may accrue to Subscriber hereunder (other than the Shares
acquired hereunder, if any) may be transferred or assigned; provided, however, Subscriber may transfer its rights and obligations hereunder to another investment fund or account managed or advised by the same manager as Subscriber (or
a related party or affiliate), provided, that no such transfer shall release Subscriber of its obligations hereunder. 
 6.7
Benefit. Except as otherwise provided herein, this Subscription Agreement shall be binding upon, and inure to the benefit of the parties hereto and their heirs, executors, administrators, successors, legal representatives, and permitted
assigns, and the agreements, representations, warranties, covenants and acknowledgments contained herein shall be deemed to be made by, and be binding upon, such heirs, executors, administrators, successors, legal representatives and permitted
assigns. 

  
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 6.8 Governing Law. This Subscription Agreement, and any claim or cause of action
hereunder based upon, arising out of or related to this Subscription Agreement (whether based on law, in equity, in contract, in tort or any other theory) or the negotiation, execution, performance or enforcement of this Subscription Agreement,
shall be governed by and construed in accordance with the laws of the State of Delaware, without giving effect to the principles of conflicts of law thereof. 

6.9 Consent to Jurisdiction; Waiver of Jury Trial. Each of the parties irrevocably consents to the exclusive jurisdiction and venue of
the Court of Chancery of the State of Delaware, provided, that if subject matter jurisdiction over the matter that is the subject of the legal proceeding is vested exclusively in the U.S. federal courts, such legal proceeding shall be heard in the
U.S. District Court for the District of Delaware (together with the Court of Chancery of the State of Delaware “Chosen Courts”), in connection with any matter based upon or arising out of this Subscription Agreement and each other
document executed in connection with the Transaction, and the consummation thereof, agrees that process may be served upon them in any manner authorized by the laws of the State of Delaware for such persons and waives and covenants not to assert or
plead any objection which they might otherwise have to such manner of service of process. Each party hereby waives, and shall not assert as a defense in any legal dispute, that (i) such person is not personally subject to the jurisdiction of
the Chosen Courts for any reason, (ii) such legal proceeding may not be brought or is not maintainable in the Chosen Courts, (iii) such person’s property is exempt or immune from execution, (iv) such legal proceeding is brought
in an inconvenient forum or (v) the venue of such legal proceeding is improper. Each party hereby agrees not to commence or prosecute any such action, claim, cause of action or suit other than before the Chosen Courts, nor to make any motion or
take any other action seeking or intending to cause the transfer or removal of any such action, claim, cause of action or suit to any court other than the Chosen Courts, whether on the grounds of inconvenient forum or otherwise. Each Party hereby
consents to service of process in any such proceeding in any manner permitted by Delaware law, and further consents to service of process by nationally recognized overnight courier service guaranteeing overnight delivery, or by registered or
certified mail, return receipt requested, at its address specified pursuant to Section 6.2. Notwithstanding the foregoing in this Section 6.9, a party may commence any action, claim, cause of action or suit in a court other than the Chosen
Courts solely for the purpose of enforcing an order or judgment issued by the Chosen Courts. TO THE EXTENT NOT PROHIBITED BY APPLICABLE LAW WHICH CANNOT BE WAIVED, EACH OF THE PARTIES MAY DO SO ONLY IF HE, SHE OR IT IRREVOCABLY AND UNCONDITIONALLY
WAIVES ANY RIGHT TO TRIAL BY JURY ON ANY CLAIMS OR COUNTERCLAIMS ASSERTED IN ANY LEGAL DISPUTE RELATING TO THIS SUBSCRIPTION AGREEMENT AND EACH OTHER DOCUMENT EXECUTED IN CONNECTION WITH THE TRANSACTIONS, AND THE CONSUMMATION THEREOF, AND FOR ANY
COUNTERCLAIM RELATING THERETO, IN EACH CASE WHETHER NOW EXISTING OR HEREAFTER ARISING. IF THE SUBJECT MATTER OF ANY SUCH LEGAL DISPUTE IS ONE IN WHICH THE WAIVER OF JURY TRIAL IS PROHIBITED, NO PARTY SHALL ASSERT IN SUCH LEGAL DISPUTE A
NONCOMPULSORY COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS SUBSCRIPTION AGREEMENT AND EACH OTHER DOCUMENT EXECUTED IN CONNECTION WITH THE TRANSACTION, AND THE CONSUMMATION THEREOF. FURTHERMORE, NO PARTY SHALL SEEK TO CONSOLIDATE ANY SUCH LEGAL
DISPUTE WITH A SEPARATE ACTION OR OTHER LEGAL PROCEEDING IN WHICH A JURY TRIAL CANNOT BE WAIVED. 

  
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 6.10 Severability. If any provision of this Subscription Agreement shall be invalid,
illegal or unenforceable, the validity, legality or enforceability of the remaining provisions of this Subscription Agreement shall not in any way be affected or impaired thereby and shall continue in full force and effect. 

6.11 No Waiver of Rights, Powers and Remedies. No failure or delay by a party hereto in exercising any right, power or remedy under this
Subscription Agreement, and no course of dealing between the parties hereto, shall operate as a waiver of any such right, power or remedy of such party. No single or partial exercise of any right, power or remedy under this Subscription Agreement by
a party hereto, nor any abandonment or discontinuance of steps to enforce any such right, power or remedy, shall preclude such party from any other or further exercise thereof or the exercise of any other right, power or remedy hereunder. The
election of any remedy by a party hereto shall not constitute a waiver of the right of such party to pursue other available remedies. No notice to or demand on a party not expressly required under this Subscription Agreement shall entitle the party
receiving such notice or demand to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of the party giving such notice or demand to any other or further action in any circumstances without
such notice or demand. 
 6.12 Survival of Representations and Warranties. All representations and warranties made by the parties
hereto in this Subscription Agreement or in any other agreement, certificate or instrument provided for or contemplated hereby, shall survive the execution and delivery hereof and any investigations made by or on behalf of the parties. 

6.13 No Broker or Finder; Expenses. Each of the parties hereto represents and warrants to the other that no broker, finder or other
financial consultant has acted on its behalf in connection with this Subscription Agreement or the transactions contemplated hereby in such a way as to create any liability on the other. Each of the parties hereto agrees to indemnify and save the
other harmless from any claim or demand for commission or other compensation by any broker, finder, financial consultant or similar agent claiming to have been employed by or on behalf of such party and to bear the cost of legal expenses incurred in
defending against any such claim. Each of the parties hereto shall pay all of its own expenses in connection with this Subscription Agreement and the transactions contemplated hereby. 

6.14 Headings and Captions. The headings and captions of the various subdivisions of this Subscription Agreement are for convenience of
reference only and shall in no way modify or affect the meaning or construction of any of the terms or provisions hereof. 
 6.15
Counterparts. This Subscription Agreement may be executed in one or more counterparts, all of which when taken together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party
and delivered to the other party, it being understood that both parties need not sign the same counterpart. In the event that any signature is delivered by facsimile transmission or any other form of electronic delivery, such signature shall create
a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect as if such signature page were an original thereof. 

  
 14 













 6.16 Construction. The words “include,” “includes,”
and “including” will be deemed to be followed by “without limitation.” Pronouns in masculine, feminine, and neuter genders will be construed to include any other gender, and words in the singular form will be
construed to include the plural and vice versa, unless the context otherwise requires. The words “this Subscription Agreement,” “herein,” “hereof,” “hereby,”
“hereunder,” and words of similar import refer to this Subscription Agreement as a whole and not to any particular subdivision unless expressly so limited. The parties hereto intend that each representation, warranty, and covenant
contained herein will have independent significance. If any party hereto has breached any representation, warranty, or covenant contained herein in any respect, the fact that there exists another representation, warranty or covenant relating to the
same subject matter (regardless of the relative levels of specificity) which such party hereto has not breached will not detract from or mitigate the fact that such party hereto is in breach of the first representation, warranty, or covenant. 

6.17 Mutual Drafting. This Subscription Agreement is the joint product of Subscriber and the Company and each provision hereof has been
subject to the mutual consultation, negotiation and agreement of such parties and shall not be construed for or against any party hereto. 

7. Disclosure. The Subscriber hereby acknowledges that the terms of this Subscription Agreement will be disclosed by the Company in a
Current Report on Form 8-K filed with the SEC on or after the date hereof and a form of this Subscription Agreement will be filed with the SEC as an exhibit thereto. 

8. Trust Account Waiver. Subscriber acknowledges that the Company is a blank check company with the powers and privileges to effect a
merger, asset acquisition, reorganization or similar business combination involving the Company and one or more businesses or assets. Subscriber further acknowledges that, as described in the Company’s prospectus relating to its initial public
offering dated April 29, 2020 (the “Prospectus”) available at www.sec.gov, substantially all of the Company’s assets consist of the cash proceeds of Company’s initial public offering and private placements of its
securities, and substantially all of those proceeds have been deposited in a trust account (the “Trust Account”) for the benefit of Company, its public shareholders and the underwriters of Company’s initial public offering.
Except with respect to interest earned on the funds held in the Trust Account that may be released to Company to pay its tax obligations, if any, the cash in the Trust Account may be disbursed only for the purposes set forth in the Prospectus. For
and in consideration of the Company entering into this Subscription Agreement, the receipt and sufficiency of which are hereby acknowledged, Subscriber, on behalf of itself and its representatives, hereby irrevocably waives any and all right, title
and interest, or any claim of any kind they have or may have in the future, in or to any monies held in the Trust Account, and agrees not to seek recourse against the Trust Account as a result of, or arising out of, this Subscription Agreement. 

[Signature Page Follows] 

  
 15 













 IN WITNESS WHEREOF, each of the Company and Subscriber has executed or caused this
Subscription Agreement to be executed by its duly authorized representative as of the date set forth below. 
  

			
	FORTRESS VALUE ACQUISITION CORP.
		
	By:	 	      

	Name:
	Title:


  

	
	Accepted and agreed this 15th day of July, 2020.


  
 16 














									
	SUBSCRIBER:	 	            	  		 	
			
	Signature of Subscriber:	 		  	Signature of Joint Subscriber, if applicable:
					
	By:	 	      
	 		  	By:	 	     

	Name:	 		  	Name:
	Title:	 		  	Title:
			
	Date: [•], 2020	 		  	
			
	Name of Subscriber:	 		  	Name of Joint Subscriber, if applicable:
			
	  
 (Please print. Please
indicate name and capacity of person signing above)
	 		  	  
 (Please Print. Please
indicate name and capacity of person signing above)

				
	  
 Name in which securities
are to be registered (if different from the name of Subscriber listed directly above):
	 		  		 	
				
	Email Address:	 		  		 	
				
	If there are joint investors, please check one:	 		  		 	
				
	 ☐   Joint Tenants with Rights of Survivorship
	 		  		 	
				
	
☐   Tenants-in-Common

	 		  		 	
				
	 ☐   Community Property
	 		  		 	
			
	Subscriber’s EIN: __________________________	 		  	Joint Subscriber’s EIN: ________________
			
	Business Address-Street:	 		  	Mailing Address-Street (if different):
			
	  
	 		  	  

			
	  
 City, State,
Zip:
	 		  	  
 City, State,
Zip:



  
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	Attn:	  	Attn:
		
	Telephone No.: __________________________	  	Telephone No.: _____________________
		
	Facsimile No.: __________________________	  	Facsimile No.: ______________________
		
	 Aggregate Number of Shares subscribed for:

                          
                          
	  	
	
	Aggregate Purchase Price:                    $ .

 You must pay the Purchase Price by wire transfer of U.S. dollars in immediately available funds to the account specified by
the Company in the Closing Notice. 

  
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 SCHEDULE A 

ELIGIBILITY REPRESENTATIONS OF SUBSCRIBER 
  

	A.	 QUALIFIED INSTITUTIONAL BUYER STATUS 



	          (Please	 check the applicable subparagraphs): 



 

	 	1.	 ☐ We are a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act of
1933, as amended (the “Securities Act”) (a “QIB”)). 


  

	 	2.	 ☐ We are subscribing for the Shares as a fiduciary or agent for one or more investor accounts, and each
owner of such account is a QIB. 


 *** OR *** 
  

	B.	 INSTITUTIONAL ACCREDITED INVESTOR STATUS 



	          (Please	 check the applicable subparagraphs): 



 

	 	1.	 ☐ We are an “accredited investor” (within the meaning of Rule 501(a) under the Securities Act)
or an entity in which all of the equity holders are accredited investors within the meaning of Rule 501(a) under the Securities Act, and have marked and initialed the appropriate box on the following page indicating the provision under which we
qualify as an “accredited investor.” 


  

	 	2.	 ☐ We are not a natural person. 



*** AND *** 
  

	C.	 AFFILIATE STATUS 



	          (Please	 check the applicable box) SUBSCRIBER: 



 

	 	☐	 is: 


  

	 	☐	 is not: 



an “affiliate” (as defined in Rule 144 under the Securities Act) of the Company or acting on behalf of an affiliate of the Company.

 This page should be completed by Subscriber 

and constitutes a part of the Subscription Agreement. 

  
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 Rule 501(a), in relevant part, states that an “accredited investor” shall mean any person who
comes within any of the below listed categories, or who the issuer reasonably believes comes within any of the below listed categories, at the time of the sale of the securities to that person. Subscriber has indicated, by marking and initialing the
appropriate box below, the provision(s) below which apply to Subscriber and under which Subscriber accordingly qualifies as an “accredited investor.” 

☐ Any bank, registered broker or dealer, insurance company, registered investment company, business development company, or small
business investment company; any plan established and maintained by a state, its political subdivisions, or any agency or instrumentality of a state or its political subdivisions, for the benefit of its employees, if such plan has total assets in
excess of $5,000,000; any employee benefit plan within the meaning of the Employee Retirement Income Security Act of 1974 if the investment decision is made by a plan fiduciary, which is either a bank, savings and loan association, insurance
company, or registered investment adviser, or if the employee benefit plan has total assets in excess of $5,000,000 or, if a self-directed plan, with investment decisions made solely by persons that are accredited investors; 

☐ Any private business development company as defined in Section 202(a)(22) of the Investment Advisers Act of 1940; 

☐ Any organization described in Section 501(c)(3) of the Internal Revenue Code, corporation, Massachusetts or similar business
trust, or partnership, not formed for the specific purpose of acquiring the securities offered, with total assets in excess of $5,000,000; 

☐ Any director, executive officer, or general partner of the issuer of the securities being offered or sold, or any director, executive
officer, or general partner of a general partner of that issuer; 
 ☐ Any natural person whose individual net worth, or joint net worth
with that person’s spouse, exceeds $1,000,000. For purposes of calculating a natural person’s net worth: (i) the person’s primary residence shall not be included as an asset; (ii) indebtedness that is secured by the person’s
primary residence, up to the estimated fair market value of the primary residence at the time of the sale of securities, shall not be included as a liability (except that if the amount of such indebtedness outstanding at the time of sale of
securities exceeds the amount outstanding 60 days before such time, other than as a result of the acquisition of the primary residence, the amount of such excess shall be included as a liability); and (iii) indebtedness that is secured by the
person’s primary residence in excess of the estimated fair market value of the primary residence at the time of the sale of securities shall be included as a liability; 

☐ Any natural person who had an individual income in excess of $200,000 in each of the two most recent years or joint income with that
person’s spouse in excess of $300,000 in each of those years and has a reasonable expectation of reaching the same income level in the current year; 

☐ Any trust, with total assets in excess of $5,000,000, not formed for the specific purpose of acquiring the securities offered, whose
purchase is directed by a sophisticated person; or 
 ☐ Any entity in which all of the equity owners are accredited investors meeting
one or more of the above tests. 
  

  
 20