Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Tiainen Matti

2. Date of Event Requiring Statement (MM/DD/YYYY) 2/1/2021

3. Issuer Name and Ticker or Trading Symbol

MARRONE BIO INNOVATIONS INC [MBII]

(Last) (First) (Middle)

C/O MARRONE BIO INNOVATIONS, INC., 1540 DREW AVENUE

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director _____ 10% Owner
___X___ Officer (give title below) _____ Other (specify below)
SVP, International Sales /

(Street)

DAVIS, CA 95618

(City) (State) (Zip)

5. If Amendment, Date Original Filed(MM/DD/YYYY)

6. Individual or Joint/Group Filing(Check Applicable Line)

_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	4647906	I	See Footnote ⁽¹⁾
Common Stock	4684	I	By Domestic Partner

*Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)*
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Stock Option (Right to Buy)	⁽²⁾	⁽²⁾	Common Stock	150000	$1.34	D

Explanation of Responses:
(1)	Ownership is held by Matfred Holdings, Ltd., of which the filer owns 60%.
(2)	The options vested with respect to 25% of the total shares subject to the option on the first anniversary of the vesting commencement date of September 16, 2019, and with respect to 1/48th of the total shares subject to the option monthly thereafter for 36 months.

Remarks:
Exhibit 24 - Power of Attorney

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Tiainen Matti C/O MARRONE BIO INNOVATIONS, INC. 1540 DREW AVENUE DAVIS, CA 95618			SVP, International Sales