This presentation discusses advancing semiconductor manufacturing technology. It begins with forward-looking statements and disclosures. It then highlights the company's strong financial performance over the past 3 years, including 97% revenue growth and 631% increase in non-GAAP EPS. The rest of the presentation focuses on the company's strategy of capitalizing on fast growing segments of the semiconductor market, its flexible business model, key customers enabling growth opportunities, and management's focus on maximizing opportunities in semiconductors.

1. Spring 2018
Advancing
Semiconductor
Manufacturing
Technology

2. This presentation may contain forward-looking statements and management may make additional forward-looking statements in
response to your questions. These statements are made under the ''safe harbor'' provisions of the U.S. Private Securities Litigation
Reform Act of 1995. These forward-looking statements can be identified by terminology such as “will,” “expects,” “anticipates,” “future,”
“intends,” “plans,” “believes,” “estimates” and similar statements. Statements that are not historical facts, including statements
concerning our beliefs, forecasts, estimates and expectations, and those regarding our expected financial results for the second quarter
of 2018 are forward-looking statements. Forward-looking statements involve inherent risks and uncertainties that could cause actual
results to differ materially from those projected or anticipated, including risks related to: the risk that our results of operations are
cyclical and may fluctuate from period to period; the risk that we rely on a small number of customers for a significant portion of our
revenue; the risk that the industries in which we participate are highly competitive and other risks outlined in our public filings with the
Securities and Exchange Commission, including as set forth under “Risk Factors”, “Management’s Discussion and Analysis of
Financial Condition and Results of Operations” and elsewhere in our most recent Quarterly Report on Form 10-Q and Annual Report
on Form 10-K filed with the Securities and Exchange Commission. The forward-looking statements made in this presentation relate
only to events or information as of the date on which the statements are made in this presentation. Except as required by law, we
undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future
events or otherwise, after the date on which the statements are made or to reflect the occurrence of unanticipated events
Management uses non-GAAP net income and non-GAAP net income per diluted share to evaluate the Company's operating and
financial results. The Company believes the presentation of non-GAAP results is useful to investors for analyzing our core business
and business trends and comparing performance to prior periods, along with enhancing investors' ability to view the Company's results
from management's perspective. The presentation of this additional information should not be considered a substitute for results
prepared in accordance with GAAP. Tables presenting reconciliations of non-GAAP results to U.S. GAAP results are included in the
Appendix.
2
Safe Harbor
Non-GAAP

3. DELIVERING
VALUE TO
INVESTORS
3
The Past 3 Years
Increase in
Revenue97%
Increase in
Non-GAAP EPS631%
Increase in
Market Cap127%
1) FY2017 over FY2015
2) Increase in market cap from beginning of FY2015 to April 24, 2018 assuming ~39M shares outstanding
3) See Appendix for reconciliation of percentage increase and GAAP EPS to non-GAAP diluted EPS.
(1)
(1)(3)
(2)

4. 4
Investment Highlights
Capitalizing on fastest growing segments of WFE
market (Dep & Etch)
Flexible, vertically integrated model supports
significant growth and creates high barriers to entry
Key customers enabling robust organic and inorganic
growth opportunities
Increasing revenues drive financial leverage and
strong operating profitability
Management focused on maximizing semiconductor
opportunity

5. INTEGRATION
& TEST
MANUFACTURING
5
Expert Outsourcing Partner to
our Customers
SUPPLY CHAIN
MANAGEMENT
Design for
manufacturability
(DFM)
Partnering with
customers on
new products
Global network of
strategic suppliers
Comprehensive
new product
introduction process
Subsystem
through full tool
integration
MANUFACTURING
ENGINEERING
PROTOTYPING/
DEVELOPMENT
The world’s largest semicap equipment focused contract manufacturer*
* Based on UCT internal estimates 5

6. 6
Strategically Focused on Key Market
Strategy shift to
FOCUS ON SEMI
Flexible model to support
TREMENDOUS GROWTH
Capitalizing on customer
OUTSOURCING STRATEGIES

7. Increased manufacturing complexity driving WFE
spend increase
7
Main UCT Growth Drivers
Significant increase in Etch and CVD to support new
devices
Customers enabling organic/inorganic SAM expansion
1
2
3

8. 0%
10%
20%
30%
40%
50%
60%
70%
80%
2015 2016 2017
WFE
Etch + CVD
UCT Semi
8
Outperforming our Served MarketsY/YGrowthRate
* Source: Gartner Semiconductor Wafer Fab Equipment Forecast (Dec 2017)
*
*
DEP/ETCH
F Y 2 0 1 7
>80% of UCT
Semi Sales
*

9. 2015
2016
2017
Q1 2018
$469.1
$562.8
$924.4
$314.8
3.4%
5.4%
10.3%
9.2%
$0.32
$0.65
$2.34
$0.69
Revenue
Non-GAAP Operating margin (1)
Non-GAAP diluted EPS (1)
$ in millions
Except EPS
9
Driving UCT’s Rapid Financial Growth
(1) Non-GAAP results exclude intangible asset amortization and non-recurring expense items. See Appendix for reconciliation of non-GAAP to GAAP amounts.

10. FRAMES
PROTOTYPE
MACHINING
METALS
MACHINING
PLASTICS
MACHINING
SHEET
METAL
FORMING
THERMAL
PRODUCTS
GAS
FOUNDING
CAPABILITY
10
Broad Capabilities
Global Sites Close to Customers
MANUFACTURED
COMPONENTS
CHEMICAL
DELIVERY
SUB-SYSTEMS
COMPLETE
ASSEMBLIES
FLUID
DELIVERY
ASSEMBLY
INTEGRATION
& TEST

11. 11
FACTORY
INTERFACE
GAS PANEL
PROCESS
CHAMBER
TRANSFER
CHAMBER
Key Customers Enable Organic Growth
2x SAM expansion from new module opportunities*
* Based on UCT internal estimates

12. A
CM-UCT
CM-A
B
CM-B
C
D
E
F
CM-C
G
H
CM-D
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
12
Leading Contract Manufacturer in a Very
Fragmented Supply Chain
Source: VLSI 2016 Critical Subsystems Market Share (excludes pump and optic suppliers), UCT internal estimates
Specialty Manufacturer
Contract Manufacturer
Hundreds of
additional suppliers
UCT positioned to support continuing demand
increases and drive supply chain consolidation
Semiequipmentrevenue
Manufacturers

13. Targeting fastest growing market segments
(dep & etch)
Scaling operations to capitalize on market growth
(close to customers)
Increasing content on customers’ platforms
(new modules)
Accelerating share growth through acquisitions
13
Growth Strategy
1
2
3
4

14. 14
Executing on the Strategy
2016 / 17 2018
Growing Faster
than WFE Market
and Customers
Additional
Organic/Inorganic
Expansion
JANUARY 2015
Focus on
Semi
MARCHI FEB 2015
& MICONEX AUG 2015
Semi
Acquisitions

15. 15
Record Revenue Growth Driving
Financial Leverage
2015
2016
2017
Q1 2018
$469.1
$562.8
$924.4
$314.8
2015
2016
2017
Q1 2018
3.4%
5.4%
10.3%
9.2%
2015
2016
2017
Q1 2018
$0.32
$0.65
$2.34
$0.69
Total Revenue
$ in millions
Non-GAAP
operating margin(1)
Non-GAAP diluted
earnings per share (1)
(1) Non-GAAP results exclude intangible asset amortization and non-recurring expense items. See Appendix for reconciliation of GAAP to non-GAAP amounts.

16. 2015
2016
2017
Q1 2018
$0.9
$17.6
$48.9
$5.1
• Variable cost based operating
model
• Targeting value-add, complex
assemblies that support
operating margin targets
• Focusing on capacity
management
- Extending capabilities and
simplifying operations
16
Strong Cash Flow & Operating Profitability
Non-GAAP Operating margin
(1)
GAAP Operating cash flow
$ in millions
(1) Non-GAAP results exclude intangible asset amortization and non-recurring expense items. See Appendix for reconciliation of GAAP to non-GAAP amounts.
3.4%
5.4%
10.3%
9.2%

17. 17
Investment Highlights
Capitalizing on fastest growing segments of WFE
market (Dep & Etch)
Flexible, vertically integrated model supports
significant growth and creates high barriers to entry
Key customers enabling robust organic and inorganic
growth opportunities
Increasing revenues drive financial leverage and
strong operating profitability
Management focused on maximizing semiconductor
opportunity

18. APPENDIX

19. 19
Balance Sheet
• Net proceeds of $94M from secondary
public offering in Q1 2018
• Generated $5.1M in cash from operations
during Q1 2018
• Inventory increase due to timing of
shipment for Q2 2018
• Ongoing improvements in working capital
management
($ in Millions) Q1’18 Q4’17
Cash &
Investments
$162.4 $68.3
Accounts
Receivable
$83.7 $90.2
Inventory $261.8 $236.8
Total Assets $680.8 $563.4
Liabilities $261.3 $263.1
Shareholders’
Equity
$419.5 $300.3

20. FY’15 FY’17
9mos’16
Revenue $469.1M $924.4M
Market Cap $273.7M $621.7M
Stock price $9.28(2) $15.94
Shares Outstanding 29.5M ~39M
GAAP EPS ($0.34) $2.19
Non-GAAP EPS $0.32 $2.34
20
Backup for Slide 3
As of
Apr 24,
2018
1) Increase in UCTT market cap from beginning of FY 2015 to April 24, 2018.
2) UCTT stock price as of December 29, 2014.
3) See Appendix for reconciliation of GAAP EPS to non-GAAP EPS.
%
Increase
127.1%(1)
97.0%
631.3%(3)

21. (in thousands)
FY’15 FY’16 Q1’17 Q2’17 Q3’17 Q4’17 FY’17 Q1’18
Reported net income (loss) on a GAAP basis $(10,732) $10,051 $14,341 $20,179 $19,716 $20,849 $75,085 $24,741
Amortization of intangible assets (1) $6,212 $5,757 $1,231 $1,231 $1,231 $1,745 $5,438 $1,098
Executive transition costs (2) $2,783 $925 - - - - - -
Restructuring charges (3) $245 $251 - - - - - $874
Consulting fees (4) - - - - - - - $150
Acquisition costs (5) $642 - - - - - - -
Impairment of “Held for Sale” Assets (6) - $666 - - - - - -
Termination of Contractual Obligation (7) - $438 - - - - - -
Income tax effect of non-GAAP adjustments (8) $(2,767) $(1,664) $(256) $(163) $(159) $(229) $(714) $(262)
Income tax effect of valuation allowance (9) $13,859 $4,964 $576 $18 $524 $(2,096) $469 $(873)
Non-GAAP net income $10,242 $21,388 $15,892 $21,265 $21,312 $20,269 $80,278 $25,728
21
Reconciliation: GAAP Net Income to Non-GAAP
Net Income
(1) Amortization of intangible assets related to the Company's acquisitions of AIT, Marchi and Miconex
(2) Represents expense for termination benefits paid to former executives of the Company
(3) Adjustment to previous restructuring reserve related to the abandonment of one of the Company's facilities
(4) One-time consulting fees related to the expansion of the Company’s operations in Singapore
(5) Costs incurred related to the acquisitions of Marchi and Miconex
(5) TBD
(6) Impairment of assets classified as “held for sale” related to our 3D printing business in Singapore
(7) Amount paid related to the termination of a long-term contractual obligation to our 3D printing business in Singapore
(8) Tax effect on amortization of intangible assets, executive transition costs, restructuring charges, acquisition costs, impairment charges, and buy-out costs based on the non-GAAP tax rate
(9) The Company's GAAP tax expense is generally higher than the Company's non-GAAP tax expense, primarily due to losses in the U.S. with full federal and state valuation allowances. The
Company's non-GAAP tax rate and resulting non-GAAP tax expense considers the tax implications as if there was no federal or state valuation allowance position in effect

22. (in thousands) FY’15 FY’16 Q1’17 Q2’17 Q3’17 Q4’17 FY’17 Q1’18
Reported GAAP income from operations $5,841 $22,391 $19,773 $24,405 $23,262 $21,957 $89,397 $26,908
Amortization of intangible assets (1) $6,212 $5,757 $1,231 $1,231 $1,231 $1,745 $5,438 $1,098
Executive transition costs (2) $2,783 $925 - - - - - -
Restructuring charges (3) $245 $251 - - - - - $874
Consulting fees (4) - - - - - - - $150
Acquisition costs (5) $642 - - - - - - -
Impairment of “Held for Sale” Assets (6) - $666 - - - - - -
Termination of Contractual Obligation (7) - $438 - - - - - -
Non-GAAP income from operations $15,723 $30,428 $21,004 $25,636 $24,493 $23,702 $94,835 $29,030
22
Reconciliation: GAAP Income from Operations to
Non-GAAP Income from Operations
(1) Amortization of intangible assets related to the Company's acquisitions of AIT, Marchi and Miconex
(2) Represents expense for termination benefits paid to former executives of the Company
(3) Adjustment to previous restructuring reserve related to the abandonment of one of the Company's facilities
(4) One-time consulting fees related to the expansion of the Company’s operations in Singapore
(5) Costs incurred related to the acquisition of Marchi and Miconex
(6) Impairment of assets classified as “held for sale” related to our 3D printing business in Singapore
(7) Amount paid related to the termination of a long-term contractual obligation to our 3D printing business in Singapore

23. FY’15 FY’16 Q1’17 Q2’17 Q3’17 Q4’17 FY’17 Q1’18
Reported GAAP net income $(0.34) $0.30 $0.42 $0.59 $0.57 $0.60 $2.19 $0.66
Amortization of intangible assets (1) $0.20 $0.18 $0.04 $0.04 $0.04 $0.05 $0.16 $0.03
Executive transition costs (2) $0.09 $0.03 - - - - - -
Restructuring charges (3) $0.01 $0.01 - - - - - $0.02
Consulting fees (4) - - - - - - - $0.01
Acquisition costs (5) $0.02 - - - - - - -
Impairment of “Held for Sale” Assets (6) - $0.02 - - - - - -
Termination of Contractual Obligation (7) - $0.01 - - - - - -
Income tax effect of non-GAAP adjustments (8) $(0.09) $(0.05) $(0.01) $(0.01) $(0.01) $(0.01) $(0.02) $(0.01)
Income tax effect of valuation allowance (9) $0.43 $0.15 $0.02 - $0.02 $(0.05) $0.01 $(0.02)
Non-GAAP net income $0.32 $0.65 $0.47 $0.62 $0.62 $0.59 $2.34 $0.69
Weighted average number of diluted shares (in K) 31,564 33,150 33,865 34,064 34,360 34,500 34,303 37,491
23
Reconciliation: GAAP Earnings Per Diluted Share
to Non-GAAP Earnings Per Diluted Share
(1) Amortization of intangible assets related to the Company's acquisitions of AIT, Marchi and Miconex
(2) Represents expense for termination benefits paid to former executives of the Company
(3) Adjustment to previous restructuring reserve related to the abandonment of one of the Company's facilities
(4) One-time consulting fees related to the expansion of the Company’s operations in Singapore
(5) Costs incurred related to the acquisition of Marchi and Miconex
(5) TBD
(6) Impairment of assets classified as “held for sale” related to our 3D printing business in Singapore
(7) Amount paid related to the termination of a long-term contractual obligation to our 3D printing business in Singapore
(8) Tax effect on amortization of intangible assets, executive transition costs, restructuring charges, acquisition costs, impairment charges, and buy-out
costs based on the non-GAAP tax rate
(9) The Company's GAAP tax expense is generally higher than the Company's non-GAAP tax expense, primarily due to losses in the U.S. with full
federal and state valuation allowances. The Company's non-GAAP tax rate and resulting non-GAAP tax expense considers the tax implications as if
there was no federal or state valuation allowance position in effect