As filed with the U.S. Securities and Exchange Commission on August 8, 2018

Registration No. 333-61366

811-10385

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

Pre-Effective Amendment No.                          o

Post-Effective Amendment No. 146 x

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 o

Amendment No. 150 x

(Check appropriate box or boxes)

Pacific Funds Series Trust

(Exact Name of Registrant as Specified in Charter)

700 Newport Center Drive, P.O. Box 7500, Newport Beach, CA 92660

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, including Area Code: (949) 219-3202

Audrey L. Cheng, Esq.

Pacific Life Insurance Company

700 Newport Center Drive

Newport Beach, CA 92660

(Name and Address of Agent for Service)

Copies to:

Anthony H. Zacharski, Esq.

Dechert LLP

90 State House Square

Hartford, CT 06103-3702

It is proposed that this filing will become effective (check appropriate box)

x  immediately upon filing pursuant to paragraph (b)

o  on (date) pursuant to paragraph (b)

o 60 days after filing pursuant to paragraph (a)(1)

o  on (date) pursuant to paragraph (a)(1)

o  75 days after filing pursuant to paragraph (a)(2)

o  on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:

o  this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 (“Securities Act”) and the Investment Company Act of 1940, the Registrant certifies that it meets all the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment No. 146 to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Newport Beach in the State of California on this 8th day of August, 2018.

PACIFIC FUNDS SERIES TRUST
By:	/s/ Mark Karpe
	Mark Karpe
	Assistant Vice President and Counsel
	Pacific Life Insurance Company

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No. 146 to the Registration Statement of Pacific Funds Series Trust has been signed below by the following persons in the capacities and on the dates indicated:

SIGNATURE		TITLE	DATE
James T. Morris*		Chairman of the Board and Trustee (Principal Executive Officer)	August 8, 2018
Adrian S. Griggs*		Chief Executive Officer	August 8, 2018
Trevor Smith*		Assistant Vice President and Treasurer	August 8, 2018
		(Principal Financial and Accounting Officer)
Frederick L. Blackmon*		Trustee	August 8, 2018
Gale K. Caruso*		Trustee	August 8, 2018
Paul A. Keller*		Trustee	August 8, 2018
Lucie H. Moore*		Trustee	August 8, 2018
Nooruddin S. Veerjee*		Trustee	August 8, 2018
*By:	/s/ Mark Karpe		August 8, 2018
	Mark Karpe
	as attorney-in-fact pursuant to power of attorney filed herewith

Pacific Funds Series Trust

Power of Attorney

The undersigned trustees and officers of Pacific Funds Series Trust (the “Trust”) hereby appoint Robin S. Yonis, Sharon A. Cheever, Jeffrey S. Puretz, Anthony Zacharski, Greg Larson, Mark Karpe, Audrey L. Cheng, Laurene E. MacElwee, Howard T. Hirakawa, and Carleton J. Muench each individually as their true and lawful attorneys-in-fact (“attorneys”), in all capacities, to execute in their name and file any and all registration statements, including registration statements on Form N-14, proxy statements, exemptive applications, no-action letter requests, shareholder reports and other regulatory filings made applicable to the Trust and each series of the Trust, and any amendments, exhibits, or supplements thereto, and any instruments necessary or desirable in connection therewith as are required to enable the Trust to comply with provisions of the Securities Act of 1933, as amended, and/or the Securities Exchange Act of 1934, as amended, and/or the Investment Company Act of 1940, as amended, and all requirements and regulations of the Securities and Exchange Commission (“SEC”) in connection with the offer of the shares of beneficial interest of the Trust and each series of the Trust, and to file the same, with other documents in connection herewith, with the SEC, any state securities regulator, any self-regulatory organization or any other governmental or official body (including, without limitation, agencies, commissions and authorities). The undersigned grant to said attorneys full authority to do every act necessary to be done in order to effectuate the same as fully, to all intents and purposes, as he or she could do if personally present, thereby ratifying all that said attorneys may lawfully do or cause to be done by virtue hereof. This Power of Attorney hereby terminates and replaces all other previously executed Power of Attorneys for the Trust related to the above.

The undersigned trustees and officers of Pacific Funds Series Trust hereby execute this Power of Attorney effective the 1st day of April, 2018.

NAME	TITLE
/s/ James T. Morris
James T. Morris	Chairman and Trustee
/s/ Frederick L. Blackmon
Frederick L. Blackmon	Trustee
/s/ Gale K. Caruso
Gale K. Caruso	Trustee
/s/ Paul A. Keller
Paul A. Keller	Trustee
/s/ Lucie H. Moore
Lucie H. Moore	Trustee
/s/ Nooruddin S. Veerjee
Nooruddin S. Veerjee	Trustee
/s/ Adrian S. Griggs
Adrian S. Griggs	Chief Executive Officer
/s/ Trevor Smith
Trevor Smith	Assistant Vice President and Treasurer

SCHEDULE OF EXHIBITS TO FORM N-1A

Exhibit
Number	Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase