Report of Foreign Issuer (6-k)

1934 Act Registration No. 1- 30702

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of January, 2018

Siliconware Precision Industries Co., Ltd.

(Translation of Registrant’s Name Into English)

NO. 123, SEC. 3, DA FONG RD. TANTZU

TAICHUNG, TAIWAN

(Address of Principal Executive Offices)

(Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F)

Form 20-F ☒ Form 40-F ☐

(Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐)

(Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐)

LOGO

News Release

Contact:

Siliconware Precision Industries Co., Ltd.

No. 123, Sec. 3, Da Fong Rd., Tantzu,

Taichung , Taiwan 42749

www.spil.com.tw

Eva Chen, VP of Finance Div.

SPILIR@spil.com.tw

+886-4-25341525#1536

Byron Chiang, Spokesperson

Spokesperson@spil.com.tw

+886-3-5795678#3676

Siliconware Precision Industries Reports Unaudited Consolidated

Financial Results for the Fourth Quarter of 2017

Taichung, Taiwan, Jan. 26, 2018 — Siliconware Precision Industries Co., Ltd . (“SPIL” or the “Company”) (Taiwan Stock Exchange: 2325, NASDAQ: SPIL) today announced that its consolidated sales revenues for the fourth quarter of 2017 were NT$ 21,623 million, which represented a 1.5% decline in revenues compared to the third quarter of 2017 and a 2.5% decline in revenues compared to the fourth quarter of 2016. SPIL reported a net income of NT$ 1,489 million for the fourth quarter of 2017, compared with a net income of NT$ 2,257 million and a net income of NT$ 2,829 million for the third quarter of 2017 and the fourth quarter of 2016, respectively.

Basic earnings per share for this quarter was NT$ 0.48, and diluted earnings per ordinary share was NT$ 0.48. Basic earnings per ADS for this quarter was US$ 0.08, and diluted earnings per ADS was US$ 0.08.

All figures were prepared in accordance with T-IFRS on a consolidated basis.

Operating results review:

•

For the fourth quarter of 2017, net revenues from IC packaging were NT$ 18,195 million and represented 84% of total net revenues. Net revenues from testing operations were NT$ 3,428 million and represented 16% of total net revenues.

•

Cost of goods sold was NT$ 17,138 million, which remained flat compared to the third quarter of 2017, and represented an increase of 1.1% compared to the fourth quarter of 2016.

•

Raw materials costs were NT$ 7,266 million for the fourth quarter of 2017 and represented 33.6% of total net revenues, whereas raw materials costs were NT$ 7,282 million and represented 33.2% of total net revenues for the third quarter of 2017.

•

The accrued expenses of bonuses to employees accounted for under cost of goods sold totaled NT$ 120 million.

•

Gross profit was NT$ 4,485 million for the fourth quarter of 2017, representing a gross margin of 20.7%, which decreased from a gross margin of 21.9% for the third quarter of 2017 and decreased from 23.6% for the fourth quarter of 2016.

•

Total operating expenses for the fourth quarter of 2017 were NT$ 2,165 million, which included selling expenses of NT$ 279 million, administrative expenses of NT$ 942 million and R&D expenses of NT$ 944 million. Total operating expenses represented 10.0% of total net revenues for the fourth quarter of 2017.

•

The accrued expenses of bonuses to employees, directors accounted for under operating expenses totaled NT$ 85 million.

•

Operating income was NT$ 2,320 million for the fourth quarter of 2017, representing an operating margin of 10.7%, which decreased from 12.5% for the third quarter of 2017 and decreased from 13.7% for the fourth quarter of 2016.

•

Non-operating items:

•

Our non-operating expense was NT$ 389 million, including net losses of NT$ 463 million on fair value change of financial liabilities at fair value through profit or loss and net foreign exchange gains of NT$ 103 million.

•

Net income before tax was NT$ 1,931 million for the fourth quarter of 2017, which decreased from a net income before tax of NT$ 2,558 million for the third quarter of 2017 and decreased from a net income before tax of NT$ 3,392 million for the fourth quarter of 2016.

•

Income tax expense was NT$ 442 million for the fourth quarter of 2017, compared with income tax expense of NT$ 301 million for the third quarter of 2017 and income tax expense of NT$ 563 million for the fourth quarter of 2016.

•

Net income was NT$ 1,489 million for the fourth quarter of 2017, which decreased from a net income of NT$ 2,257 million for the third quarter of 2017 and decreased from a net income of NT$ 2,829 million for the fourth quarter of 2016.

•

Total number of shares outstanding was 3,116 million shares as of Dec. 31, 2017. Basic earnings per share for this quarter was NT$ 0.48, and diluted earnings per ordinary share was NT$ 0.48. Basic earnings per ADS for this quarter was US$ 0.08, and diluted earnings per ADS was US$ 0.08.

Capital expenditure and balance sheet highlight:

•

Our cash balances totaled NT$ 24,444 million as of Dec. 31, 2017 from NT$ 20,783 million as of Sep. 30, 2017, and NT$ 24,476 million as of Dec. 31, 2016.

•

Capital expenditures for the fourth quarter of 2017 totaled NT$ 2,306 million.

•

Total depreciation expenses for the fourth quarter of 2017 totaled NT$ 3,800 million.

IC packaging service:

•

Net revenues from IC packaging operations were NT$ 18,195 million for the fourth quarter of 2017, which represented a decrease of NT$ 510 million or 2.7% compared to the third quarter of 2017.

•

Substrate-based packaging, leadframe-based packaging and wafer bumping & Flip Chip accounted for 27%, 17% and 40%, respectively, of total net revenues for the fourth quarter of 2017.

•

As of Dec. 31, 2017 we had 8,207 wirebonders installed, of which 249 were disposed in the fourth quarter of 2017.

IC testing service:

•

Net revenues from testing operations were NT$ 3,428 million for the fourth quarter of 2017, which represented an increase of NT$ 178 million or 5.5% compared to the third quarter of 2017.

•

As of Dec. 31, 2017 we had 574 testers installed, of which 4 were added and 1 were disposed in the fourth quarter of 2017.

Revenue Analysis

•

Breakdown by end applications:


By application	4Q17			3Q17
Communication		68	%		65	%
Computing		11	%		12	%
Consumer		19	%		21	%
Memory		2	%		2	%

•

Breakdown by packaging type:


By application	4Q17			3Q17
Bumping & Flip Chip		40	%		39	%
Substrate Based		27	%		29	%
Leadframe Based		17	%		17	%
Testing		16	%		15	%

About SPIL

Siliconware Precision Industries Ltd. (“SPIL”)(NASDAQ:SPIL, Taiwan Stock Exchange:2325) is a leading provider of comprehensive semiconductor assembly and test services. SPIL is dedicated to meeting all of its customers’ integrated circuit packaging and testing requirements, with turnkey solutions that range from design consultations, modeling and simulations, wafer bumping, wafer probe and sort, package assembly, final test, burn-in, to shipment. Products include advanced leadframe, substrate packages, wafer bumping and FCBGA, which are widely used in personal computers, communications, Internet appliances, cellular phones, digital cameras, cable modems, personal digital assistants and LCD monitors. SPIL supplies services and support to fabless design houses, integrated device manufacturers and wafer foundries globally. For further information, visit SPIL’s web site at www.spil.com.tw .

Safe Harbor Statement

The information herein contains forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933 and Section 21E of the U.S. Securities Exchange Act of 1934. We have based these forward-looking statements on our current expectation and projections about future events. Such forward-looking statements are inherently subject to known and unknown risks, uncertainties, assumptions about us and other factors that may cause the actual performance, financial condition or results of operations of SPIL to be materially different from what may be implied by such forward-looking statements. Investors are cautioned that actual events and results could differ materially from those statements as a result of a number of factors, including, among other things:

•

the intensely competitive personal computer, communications, consumer ICs and non-commodity memory semiconductor industries and markets;

•

cyclical nature of the semiconductor industry;

•

risks associated with global business activities;

•

non-operating losses due to poor financial performance of some of our investments;

•

our dependence on key personnel;

•

general economic and political conditions;

•

possible disruptions in commercial activities caused by natural and human induced disaster, including terrorist activities and armed conflicts and contagious disease, such as the Severe Acute Respiratory Syndrome;

•

fluctuations in foreign currency exchange rates; and

•

other risks identified in our annual reports on Form 20-F filed with the U.S. Securities and Exchange Commission each year.

The words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “plan” and similar expressions, as they relate to us, are intended to identify a number of these forward-looking statements. We undertake no obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise. In light of these risks, uncertainties and assumptions, the forward-looking events discussed herein might not occur and our actual results could differ materially from those anticipated in these forward-looking statements.

All financial figures discussed herein are prepared pursuant to TIFRS on a consolidated basis. The investment gains or losses of our company for the three months ended Dec. 31, 2017 reflect our gains or losses attributable to the fourth quarter of 2017 unaudited financial results of several of our investees which are evaluated under the equity method. Neither the consolidated financial data for our company for the three months ended Dec. 31, 2017, nor the consolidated financial data for our company for the twelve months ended Dec. 31, 2017 is necessarily indicative of the results that may be expected for any period thereafter.

SILICONWARE PRECISION INDUSTRIES CO., LTD.

CONSOLIDATED BALANCE SHEET (UNAUDITED)

As of Dec 31, 2017 and 2016

(Expressed in Thousands of New Taiwan Dollars (NTD) and U.S. Dollars (USD))


	Dec 31, 2017						Dec 31, 2016				Sequential
ASSETS	USD		NTD		%		NTD		%		Change			%
Current Assets
Cash and cash equivalent		821,374		24,444,083		20		24,476,270		20		(32,187	)		(0.1	)
Available-for-sale financial assets		—		—		—		178,176		—		(178,176	)		(100.0	)
Accounts receivable		567,103		16,876,990		14		17,378,474		14		(501,484	)		(2.9	)
Inventories		205,769		6,123,682		5		6,498,832		5		(375,150	)		(5.8	)
Other current assets		54,474		1,621,157		2		1,919,543		2		(298,386	)		(15.5	)

Total current assets		1,648,720		49,065,912		41		50,451,295		41		(1,385,383	)		(2.7	)

Non-current Assets
Available-for-sale financial assets		138,952		4,135,207		3		3,615,658		3		519,549			14.4
Long-term investment under equity method		98,535		2,932,392		2		2,400,981		2		531,411			22.1
Property, plant and equipment		2,096,709		62,398,065		52		65,380,409		52		(2,982,344	)		(4.6	)
Intangible assets		4,007		119,268		—		175,862		—		(56,594	)		(32.2	)
Other assets		75,135		2,236,011		2		1,736,036		2		499,975			28.8

Total non-current assets		2,413,338		71,820,943		59		73,308,946		59		(1,488,003	)		(2.0	)

Total Assets		4,062,058		120,886,855		100		123,760,241		100		(2,873,386	)		(2.3	)


LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities
Current Liabilities
Short-term loans		115,000		3,422,400		3		2,741,250		2		681,150			24.8
Financial liabilities at fair value through profit or loss - current		27,206		809,640		1		773,908		1		35,732			4.6
Accounts payable		250,570		7,456,974		6		8,194,647		6		(737,673	)		(9.0	)
Current portion of bonds payable		—		—		—		12,712,651		10		(12,712,651	)		(100.0	)
Current portion of long-term debt		106,631		3,173,333		2		3,500,747		3		(327,414	)		(9.4	)
Other current liability		380,789		11,332,268		9		13,165,236		12		(1,832,968	)		(13.9	)

Non-current liabilities
Bonds payable		403,737		12,015,229		10		—		—		12,015,229			—
Long-term loans		425,627		12,666,667		11		14,840,000		12		(2,173,333	)		(14.6	)
Other liabilities		56,806		1,690,552		1		1,644,482		1		46,070			2.8

Total Liabilities		1,766,366		52,567,063		43		57,572,921		47		(5,005,858	)		(8.7	)

Stockholders’ Equity
Capital stock		1,047,165		31,163,611		26		31,163,611		25		—			—
Capital reserve		424,819		12,642,615		10		12,641,997		10		618			0.0
Legal reserve		397,759		11,837,317		10		10,844,001		9		993,316			9.2
Retained earnings		359,504		10,698,848		9		10,252,276		8		446,572			4.4
Other equities		66,445		1,977,401		2		1,285,435		1		691,966			53.8

Total Equity		2,295,692		68,319,792		57		66,187,320		53		2,132,472			3.2

Total Liabilities & Shareholders’ Equity		4,062,058		120,886,855		100		123,760,241		100		(2,873,386	)		(2.3	)

Forex ( NT$ per US$ )				29.760				32.250

(1)	All figures are under T-IFRS.

SILICONWARE PRECISION INDUSTRIES CO., LTD.

CONSOLIDATED COMPREHENSIVE INCOME STATEMENT (UNAUDITED)

(Expressed in Thousands of New Taiwan Dollars (NTD) and U.S. Dollars (USD))


	3 months ended on Dec 31															Sequential Comparison
	4Q 2017									4Q 2016			YoY			4Q 2017			3Q 2017			QoQ
	USD			NTD			%			NTD			change %			NTD			NTD			change %
Revenues		718,174			21,622,785			100.0			22,177,508			(2.5	)		21,622,785			21,955,373			(1.5	)
Cost of Goods Sold		(569,202	)		(17,137,541	)		(79.3	)		(16,949,723	)		1.1			(17,137,541	)		(17,140,604	)		(0.0	)

Gross Profit		148,972			4,485,244			20.7			5,227,785			(14.2	)		4,485,244			4,814,769			(6.8	)

Operating Expenses
Selling Expenses		(9,265	)		(278,955	)		(1.3	)		(282,984	)		(1.4	)		(278,955	)		(264,539	)		5.4
Administrative Expenses		(31,287	)		(941,971	)		(4.3	)		(873,787	)		7.8			(941,971	)		(809,475	)		16.4
Research and Development Expenses		(31,365	)		(944,345	)		(4.4	)		(1,029,466	)		(8.3	)		(944,345	)		(999,827	)		(5.5	)

		(71,917	)		(2,165,271	)		(10.0	)		(2,186,237	)		(1.0	)		(2,165,271	)		(2,073,841	)		4.4

Operating Income		77,055			2,319,973			10.7			3,041,548			(23.7	)		2,319,973			2,740,928			(15.4	)
Non-operating Items		(12,906	)		(388,576	)		(1.8	)		350,651			—			(388,576	)		(182,915	)		(112.4	)

Income Before Income Tax		64,149			1,931,397			8.9			3,392,199			(43.1	)		1,931,397			2,558,013			(24.5	)
Income Tax Expenses		(14,694	)		(442,408	)		(2.0	)		(563,300	)		(21.5	)		(442,408	)		(301,499	)		46.7

Net Income		49,455			1,488,989			6.9			2,828,899			(47.4	)		1,488,989			2,256,514			(34.0	)

Other comprehensive income
Items that will not be reclassiflied to profit or loss
Remeasurements of post employment benefit obligations		354			10,647						(177,806	)								—
Income tax relating to items that will not be reclassified to profit or loss		(60	)		(1,810	)					30,227									—
Items that may be subsequently reclassified to profit or loss
Exchange difference on translation of foreign financial statements		(566	)		(17,030	)					(48,053	)								162,591
Unrealized gain(loss) on available-for-sale financial assets		(19,695	)		(592,973	)					(822,053	)								(7,802	)
Share of other comprehensive income of associates		1,597			48,076						(52,254	)								(31,159	)
Income tax relating to items that may be reclassified to profit or loss		—			—						143,671									—

Total other comprehensive income (loss)		(18,370	)		(553,090	)					(926,268	)								123,630

Total comprehensive income		31,085			935,899						1,902,631									2,380,144

Earnings Per Ordinary Share- Basic				NT$	0.48					NT$	0.91								NT$	0.72

Earnings Per Ordinary Share- Diluted				NT$	0.48					NT$	0.89								NT$	0.71

Earnings Per ADS- Basic				US$	0.08					US$	0.14								US$	0.12

Earnings Per ADS- Diluted				US$	0.08					US$	0.14								US$	0.12

Weighted Average Outstanding Shares -Diluted (‘k)					3,120,063						3,389,863									3,397,597

Forex ( NT$ per US$ )					30.108						31.767									30.267

(1)	All figures are under T-IFRS.

(2)	1 ADS is equivalent to 5 Common Shares.

SILICONWARE PRECISION INDUSTRIES CO., LTD.

CONSOLIDATED COMPREHENSIVE INCOME STATEMENT (UNAUDITED)

(Expressed in Thousands of New Taiwan Dollars (NTD) and U.S. Dollars (USD))


	12 months ended on Dec 31
	2017									2016			YoY
	USD			NTD			%			NTD			change %
Revenues		2,747,394			83,554,385			100.0			85,111,913			(1.8	)
Cost of Goods Sold		(2,194,345	)		(66,740,290	)		(79.9	)		(65,762,191	)		1.5

Gross Profit		553,049			16,814,095			20.1			19,349,722			(13.1	)

Operating Expenses
Selling Expenses		(33,956	)		(1,032,799	)		(1.2	)		(1,024,689	)		0.8
Administrative Expenses		(107,311	)		(3,264,130	)		(3.9	)		(3,495,613	)		(6.6	)
Research and Development Expenses		(126,264	)		(3,841,996	)		(4.6	)		(4,043,290	)		(5.0	)

		(267,531	)		(8,138,925	)		(9.7	)		(8,563,592	)		(5.0	)

Operating Income		285,518			8,675,170			10.4			10,786,130			(19.6	)
Non-operating Items		1,231			26,165			0.0			898,437			(97.1	)

Income Before Income Tax		286,749			8,701,335			10.4			11,684,567			(25.5	)
Income Tax Expenses		(59,363	)		(1,801,170	)		(2.1	)		(1,751,407	)		2.8

Net Income		227,386			6,900,165			8.3			9,933,160			(30.5	)

Other comprehensive income
Items that will not be reclassiflied to profit or loss
Remeasurements of post employment benefit obligations		354			10,647						(177,806	)
Income tax relating to items that will not be reclassified to profit or loss		(60	)		(1,810	)					30,227
Items that may be subsequently reclassified to profit or loss
Exchange difference on translation of foreign financial statements		(6,951	)		(226,323	)					(908,801	)
Unrealized gain (loss) on available-for-sale financial assets		14,779			465,175						(1,469,105	)
Share of other comprehensive income of associates		14,873			456,665						(132,938	)
Income tax relating to items that may be reclassified to profit or loss		(403	)		(12,388	)					154,113

Total other comprehensive income (loss)		22,592			691,966						(2,504,310	)

Total comprehensive income		249,978			7,592,131						7,428,850

Earnings Per Ordinary Share- Basic				NT$	2.21					NT$	3.19

Earnings Per Ordinary Share- Diluted				NT$	1.86					NT$	2.68

Earnings Per ADS- Basic				US$	0.36					US$	0.50

Earnings Per ADS- Diluted				US$	0.31					US$	0.42

Weighted Average Outstanding Shares - Diluted (‘k)					3,413,871						3,410,681

Forex ( NT$ per US$ )					30.345						32.151

(1)	All figures are under T-IFRS.

(2)	1 ADS is equivalent to 5 Common Shares.

SILICONWARE PRECISION INDUSTRIES CO., LTD.

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

For 12 Months Ended on Dec 31, 2017 and 2016

(Expressed in Thousands of New Taiwan Dollars (NTD) and U.S. Dollars (USD))


	12 months, 2017						12 months, 2016
	USD			NTD			NTD
Cash Flows from Operating Activities:
Income before income tax		286,749			8,701,335			11,684,567
Depreciation		474,015			14,415,980			12,905,830
Amortization		6,863			209,319			385,360
Change in working capital & others		(128,250	)		(3,931,151	)		(4,131,205	)

Net cash flows provided from operating activities		639,377			19,395,483			20,844,552

Cash Flows from Investing Activities:
Acquisition of property, plant, and equipment		(424,797	)		(12,932,655	)		(15,295,121	)
Proceeds from disposal of available-for-sale financial assets		—			—			1,454,403
Proceeds from disposal of property, plant, and equipment		20,210			622,487			167,021
Others		(1,872	)		(54,519	)		(368,014	)

Net cash used in investing activities		(406,459	)		(12,364,687	)		(14,041,711	)

Cash Flows from Financing Activities:
Increase in short-term loans		74,867			2,265,169			—
Decrease in short-term loans		(44,721	)		(1,353,089	)		—
Proceeds from long-term loans		32,160			1,000,000			9,000,000
Repayment of long-term loans		(111,279	)		(3,413,112	)		(4,228,721	)
Cash dividends distributed to shareholders		(180,184	)		(5,453,632	)		(11,842,172	)
Others		718			21,749			(90,440	)

Net cash used in financing activities		(228,439	)		(6,932,915	)		(7,161,333	)

Foreign currency exchange effect		(4,126	)		(130,068	)		(356,612	)

Net decrease in cash and cash equivalents		353			(32,187	)		(715,104	)

Cash and cash equivalents at beginning of period		787,145			24,476,270			25,191,374

Cash and cash equivalents at end of period		787,498			24,444,083			24,476,270

Forex ( NT$ per US$ )					30.345			32.151

(1) : All figures are under T-IFRS.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.