As filed with the Securities and Exchange Commission on July 11, 2016.May 8, 2017.

Registration No. 333-212093333-217415

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Amendment No. 12

to

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

TPI Composites, Inc.

(Exact name of registrant as specified in its charter)

TPI Composites, Inc.

8501 N. Scottsdale Rd.

Gainey Center II, Suite 100

Scottsdale, AZ 85253

(480) 305-8910

(Address, including zip code, and telephone number,

including area code, of registrant’s principal executive offices)

Steven C. Lockard

Chief Executive Officer

TPI Composites, Inc.

8501 N. Scottsdale Rd.

Gainey Center II, Suite 100

Scottsdale, AZ 85253

(480) 305-8910

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of proposed sale to public: As soon as practicable after this Registration Statement is declared effective.

If any of the securities being registered on this form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box.  ¨☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier registration statement for the same offering.  ¨☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier registration statement for the same offering.  ¨☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”filer,” “smaller reporting company” and “smaller reporting“emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.  ☒

CALCULATION OF REGISTRATION FEE

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the Registration Statement shall become effective on such date as the Commission, acting pursuant to Section 8(a), may determine.

The information in this preliminary prospectus is not complete and may be changed. These securitiesThe selling stockholders may not be soldsell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This preliminary prospectus is not an offer to sell nor does it seekthese securities and the selling stockholders are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Subject to Completion, dated July 11, 2016May 8, 2017

PRELIMINARY PROSPECTUS

7,250,0004,500,000 Shares

Common Stock

This is the initial public offeringThe selling stockholders identified in this prospectus, which include certain of TPI Composites, Inc. Weour executive officers, are selling 7,250,000 shares of our common stock.

stock in this offering. We expectwill not receive any proceeds from the public offering pricesale of shares to be between $15.00 and $17.00 per share. Currently, no public market exists foroffered by the shares. After pricing of the offering, we expect that the shares will tradeselling stockholders.

Our common stock is listed on The NASDAQ Global Market under the symbol “TPIC”.“TPIC.” On May 5, 2017, the last reported sale price of our common stock on The NASDAQ Global Market was $17.97 per share.

We are an “emerging growth company” under federal securities laws and, as such, will beare subject to reduced public company disclosure standards. See “Prospectus Summary—Implications of Being an Emerging Growth Company.”

Investing in our common stock involves risks that are described in the “Risk Factors” section beginning on page 2118 of this prospectus.

The underwriters may also exercise their option to purchase up to an additional 1,087,500675,000 shares from usthe selling stockholders at the public offering price, less the underwriting discount, for 30 days after the date of this prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The shares will be ready for delivery on or about                     , 2016.2017.

The date of this prospectus is                     , 2016.2017.

TABLE OF CONTENTS

We, the selling stockholders and the underwriters have not authorized anyone to provide any information other than that contained in this prospectus or any free writing prospectus prepared by us or on our behalf. We, the selling stockholders and the underwriters are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. The information contained in this prospectus is accurate only as of the date on the front cover of this prospectus regardless of the time of delivery of this prospectus or of any sale of our common stock.

INDUSTRY AND MARKET DATA

This prospectus contains statistical data, estimates and forecasts that are based on independent industry publications, such as those published by the American Wind Energy Association or AWEA,(AWEA), Bloomberg New Energy Finance or BNEF,(BNEF), International Energy Agency or IEA,(IEA), MAKE Consulting or MAKE,(MAKE), Energy Information Administration or EIA,(EIA), Lazard Ltd or Lazard,(Lazard), the International Renewable Energy Agency (IRENA), Wind Energy Foundation (WEF), Global Wind Energy Council (GWEC), or other publicly available information, as well as other information based on our internal sources. Although we believe that the third-party sources referred to in this prospectus are reliable, neither we nor the underwriters have independently verified the information provided by these third parties. While we are not aware of any misstatements regarding any third-party information presented in this prospectus, their estimates, in particular as they relate to projections, involve numerous assumptions, are subject to risks and uncertainties, and are subject to change based on various factors, including those discussed under the section titled “Risk Factors” and elsewhere in this prospectus.

i

RISK FACTORS

An investment in our common stock involves a high degree of risk. You should consider carefully the following risks and other information contained in this prospectus, including our consolidated financial statements and related notes, before you decide whether to buy our common stock. If any of the events contemplated by the following discussion of risks should occur, our business, results of operations, financial condition and growth prospects could suffer significantly. As a result, the market price of our common stock could decline, and you may lose all or part of the money you paid to buy our common stock. The risks below are not the only ones we face. Additional risks that we currently do not know about or that we currently believe to be immaterial may also impair our business. Certain statements below are forward-looking statements. See “Special Note Regarding Forward-Looking Statements” in this prospectus.

Risks Related to Our Wind Blade Business

GE’s acquisition of LM Wind Power, our largest competitor, may materially harm our business, financial condition and results of operations and may cause the price of our common stock to decline.

In April 2017, GE completed its acquisition of LM Wind Power, our largest competitor. We currently have entered into five supply agreements with GE Wind providing for the supply of wind blades from our Iowa facility; two Juárez, Mexico facilities; our original Turkey facility; and our Taicang Port, China facility. In October 2016, we entered into (i) an amended and restated supply agreement for the continued supply of wind blades from our Iowa facility through December 31, 2020, (ii) an amendment to our existing supply agreement for the continued supply of wind blades from our original Juárez, Mexico facility through December 31, 2020 and (iii) a new supply agreement with GE Wind for the supply of incremental wind blades from our second manufacturing facility in Juárez, Mexico through December 31, 2020. Although we recently extended and expanded certain of our supply agreements, GE Wind may decide to utilize LM for more of its wind blade production as a result of the acquisition of LM. As such, GE Wind may not continue to purchase wind blades from us at similar volumes or on as favorable terms in the future. In addition, our current supply agreements with GE Wind for the supply of wind blades from our Turkey and Taicang, China facilities expire on December 31, 2017. In March 2017, the Company announced that it does not intend to renew the Turkey supply agreement with GE Wind, and GE Wind or the Company may elect not to renew the China supply agreement. GE Wind also may elect to terminate our Iowa supply agreement at the end of 2018 or 2019 by providing us with 12 months’ advance notice and paying us a specified termination fee. GE Wind may also elect to terminate our two Mexico supply agreements with 15 days’ notice and pay us a termination fee. If GE Wind elects to utilize LM for more of its wind blade production, reduce the volumes of wind blades it purchases from us or terminates any of our supply agreements, it may materially harm our business, financial condition and results of operations.

In addition, GE Ventures Limited (GE Ventures), a GE affiliated company, owns 8.4% of our outstanding common stock as of March 31, 2017. GE Ventures’ lock-up agreement with our IPO underwriters expired on January 17, 2017 and as a result of GE’s recent acquisition of LM, GE Ventures may be more inclined to sell all or a portion of its shares of our common stock. If GE Ventures sells all or a portion of its holdings of our common stock pursuant to Rule 144 or otherwise, it may cause the price of our common stock to decline.

The results of the 2016 United States presidential and congressional elections has created regulatory uncertainty for our business and the wind energy sector and may materially harm our business, financial condition and results of operations.

U.S. President Trump, certain members of the U.S. Congress, and key U.S. administrative officials and policy makers have suggested renegotiation of The North American Free Trade Agreement and the implementation of tariffs, duties, border taxes or other similar assessments that could impact the level of trade between the U.S. and Mexico. President Trump also has publicly stated that he may seek to impose tariffs, duties,

border taxes or other similar assessments on products imported from China. A substantial amount of the wind blades that we manufacture in our Mexico and China facilities are imported into the United States. If any such tariffs, duties, border taxes or other assessments are imposed on our wind blades that are imported into the United States, it would increase the total cost of our wind blades and may decrease demand for our wind blades. In addition, we may not be able to fully pass on the added cost of such tariffs, taxes, duties or assessments to our customers and may materially harm our business, financial condition and results of operations.

President Trump also has made comments during his presidency and the presidential campaign suggesting that he is not supportive of various clean energy programs and initiatives designed to curtail global warming. In March 2017, President Trump signed an executive order that requires, among other things, that the EPA withdraw the Clean Power Plan and draft new regulations to replace it. It remains unclear what impact, if any, this executive order will have on the demand for wind energy domestically and internationally. In addition, it remains unclear what specifically President Trump would or would not do with respect to these programs and initiatives, and what support he would have for any potential changes to such legislative programs and initiatives in the Unites States Congress, even though both the House of Representatives and Senate are controlled by the Republican Party. If President Trump and/or the United States Congress take action or publicly speak out about the need to eliminate, modify or further reduce the PTC, the Clean Power Plan or other legislation, regulations and incentives supporting wind energy, such actions may result in a decrease in demand for wind energy in the United States and other geographical markets and may materially harm our business, financial condition and results of operations.

A significant portion of our business is derived from a small number of customers, and one wind blade customer in particular, therefore any loss of or reduction in purchase orders, failure of these customers to fulfill their obligations or our failure to secure long-term supply agreement renewals from these customers would materially harm our business.

Substantially all of our revenues are derived from four wind blade customers. One customer, GE Wind, accounted for 54.6%44.3%, 50.3%, 53.3%, and 73.2% and 91.2% of our total net sales for the three months ended March 31, 20162017 and for the years ended December 31, 2016, 2015 2014 and 2013,2014, respectively. In addition, three customers, Vestas, Nordex and Gamesa accounted for 17.0%23.2%, 11.1%17.5% and 10.3%13.7% of our net sales for the three months ended March 31, 2016,2017, respectively, and three customers, Nordex, Acciona (which was acquired by Nordex in April 2016)20.1%, 17.5% and Gamesa accounted for 15.7%, 10.8% and 10.3% of our net sales for the year ended December 31, 2016, respectively. During the year ended December 31, 2015, two customers, Nordex and Gamesa, accounted for 26.5% and 10.3% of our net sales, respectively. Accordingly, we are substantially dependent on continued business from our current wind blade customers, and GE Wind in particular. GE Wind and other customers may not continue to purchase wind blades from us at similar volumes or on as favorable terms in the future. For example, GESee “GE’s acquisition of LM Wind has inPower, our largest competitor, may materially harm our business, financial condition and results of operations and may cause the past informed usprice of their intentionour common stock to terminate a supply agreement. However, in that case, the agreement was not terminated but was instead renegotiated.decline.” If GE Wind or one or more of our other wind blade customers were to reduce or delay wind blade orders, fail to pay amounts due or satisfactorily perform their respective contractual obligations with us or otherwise terminate or fail to renew their long-term supply agreements with us, our business, financial condition and results of operations could be materially harmed.

Defects in materials and workmanship or wind blade failures could harm our reputation, expose us to product warranty or other liability claims, decrease demand for our wind blades, or materially harm existing or prospective customer relationships.

Defects in our wind blades, whether caused by a design, engineering, materials, manufacturing or component failure or deficiencies in our manufacturing processes, are unpredictable and an inherent risk in manufacturing technically advanced products. We have, in the past, experienced wind blade testing failures and defects at some of our facilities during the startup manufacturing phase of new products, and we may experience failures or defects in the future. For instance, customer qualification of our Iowa facility was delayed due to some wind blade testing failures in 2010, resulting in corresponding delays in our wind blade production at that facility. We have also experienced wind blade failures in the field. For example, in April 2015, a wind blade we manufactured failed in Finland. Any such customer qualification and wind blade testing failures or other product defects in the future could materially harm our existing and prospective customer relationships. Specifically, negative publicity about the quality of our wind

blades or defects in the wind blades supplied to our customers could result in a reduction in wind blade orders, increased warranty claims, product liability claims and other damages or termination of our long-term supply agreements or business relationships with current or new customers. In addition, we have recently started wind blade production at new facilities in Turkey and Mexico which may expose us to greater risk of warranty claims as these facilities ramp up to serial production levels.

We may determine that resolving potential warranty claims through a negotiated settlement may be in the best interest of the business and long-term customer relationships. For example, in June 2016, we entered into

a settlement agreement and release with one of our customers, Nordex relating to the April 2015 wind blade failure referenced above.failure. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Other Contingencies” for more information. Wind blades may also fail due to lightning strikes andor other extreme weather, which could also result in negative publicity regarding our wind blades and wind energy in general. In addition, product defects may require costly repairs or replacement components, a change in our manufacturing processes or recall of previously manufactured wind blades, which could result in significant expense and materially harm our existing or prospective customer relationships. Further, defects or product liability claims, with or without merit, may result in negative publicity that could harm our future sales and our reputation in the industry. Any of the foregoing could materially harm our business, operating results and financial condition.

We have experienced, and could in the future experience, quality or operational issues in connection with plant construction or expansion, wind blade model transitions and wind blade manufacturing, which could result in losses and cause delays in our ability to complete our projects and may therefore materially harm our business, financial condition and results of operations.

We dedicate most of the capacity of our current wind blade manufacturing facilities to existing customers and, as a result, we may need to build additional manufacturing capacity or facilities to serve the needs of new customers or expanded needs of existing customers. We haverecently entered into lease agreements with third parties to lease new manufacturing facilities in Mexico and Turkey, and we expect to commencecommenced operations at these new facilities in the second halfthird quarter of 2016. We have also entered into a new lease with a third party for a third manufacturing facility in Juárez, Mexico, and we expect to commencecommenced operations at this facility in the first half ofJanuary 2017. The construction of new plants and the expansion of existing plants involves significant time, cost and other risks. We expect our plants to generate losses in their first 12 to 24 months of operations related to production startup expenses.costs. Additionally, numerous factors can contribute, and have in the past contributed, to delays or difficulties in the startup of, or the adoption of our manufacturing lines to produce larger wind blade models, which we refer to as model transitions, in our manufacturing facilities, including permitting, construction or renovation delays, the engineering and fabrication of specialized equipment, the modification of our general production know-how and customer-specific manufacturing processes to address the specific wind blades to be tested and built, changing and evolving customer specifications and expectations and the hiring and training of plant personnel. If our production or the delivery by any third-party suppliers of any custom equipment is delayed, the construction or renovation of the facility, or the addition of the production line would be delayed. Any delays or difficulties in plant startup or expansion may result in cost overruns, production delays, contractual penalties, loss of revenues and impairment of customer relationships, which could materially harm our business, financial condition and results of operations.

Our long-term supply agreements with our customers are subject to termination on short notice and our failure to perform our obligations under these agreements or the termination of agreements would materially harm our business.

Our current long-term supply agreements expire between the end of 2017 and the end of 2021.2023. Some of our long-term supply agreements contain provisions that allow for the termination of those agreements upon the customer providing us with 92 to 365 days’ advance written notice or, in one instance,two instances, upon no advance notice, or upon a material breach that goes uncured for up to 15 to 30 days. Additionally, our long-term supply agreements contain provisions allowing our customers to terminate these agreements upon our failure to deliver

the contracted wind blade volumes or our failure to meet certain mutually agreed upon cost reductions. Our customers may not continue to maintain long-term supply agreements with us in the future. If one or more of our customers terminate or fail to renew their long-term supply agreements with us, it would materially harm our business, financial condition and results of operations.

We operate in an industry characterized by changing customer demands and associated transition costs, which could materially harm our business.

The wind energy industry is competitive and is characterized by evolving customer demands. As a result, we must adapt quickly to customer requests for changes to wind blade specifications, which increases our

costs and can provide periods of reduced revenue and margins. For instance, in 2015 in order to satisfy GE Wind’s need for bigger wind turbines with larger wind blades, we recently agreed, at GE Wind’s request, to implementwe implemented model transitions at our U.S., China, Mexico and Turkey facilities, resulting in unplanned delays in wind blade production and associated transition costs at each of these facilities. We expect to have five to six lines in transition during 2017. We are generally able to share transition costs with the customer in connection with these changing customer demands, but any sharing is the subject of negotiation and the amount is not always contractually defined. If we do not receive transition payments from our customers sufficient to cover our transition costs or lost margins, our business, financial condition and results of operations could be materially harmed.

The concentration of customers in our wind business could enable one or more of our customers to attempt to substantially influence our policies, business and affairs going forward.

Our dependence on four wind blade customers, and GE Wind in particular, for substantially all of our revenues could encourage GE Wind or these customers to attempt to impose new or additional requirements on us that reduce the profitability of our long-term supply agreements with them or otherwise influence our policies, choice of and arrangements with raw material suppliers and other aspects of our business. Our customers could also attempt to influence the outcome of a corporate transaction if the transaction benefits a customer’s competitor or is otherwise perceived as not advantageous to a customer, which could have the effect of delaying, deterring, or preventing a transaction that could benefit us. In addition, consolidation of some of our customers may result in increased customer concentration and the potential loss of customers. For example, GE Wind acquired Alstom S.A.’s power business in 2015, Nordex completed its acquisition of Acciona in April 2016 and in June 2016 Siemens A.G. (Siemens) and Gamesa announced a plannedcompleted the merger of Siemens’ wind businessSiemens Wind Power with Gamesa.Gamesa in April 2017. Although we are not constrained by any exclusivity agreements with any of our existing wind blade customers, they may resist our development of new customer relationships, which could affect our relationships with them or our ability to secure new customers.

Demand for our wind blades may fluctuate for a variety of reasons, including the growth of the wind industry, and decreases in demand could materially harm our business and may not be sufficient to support our growth strategy.

Our revenues, business prospects and growth strategy heavily depend on the continued growth of the wind industry and our customers’ continuing demand for our wind blades. Customer demand could decrease from anticipated levels due to numerous factors outside of our control that may affect the development of the wind energy market generally, portions of the market or individual wind project developments, including:

In addition to factors affecting the wind energy market generally, our customers’ demand may also fluctuate based on other factors beyond our control. Any decline in customer demand below anticipated levels could materially harm our revenues and operating results and could delay or impede our growth strategy.

Changes in customers’ business focus and strategy could materially harm our business and results of operations.

Changes in our customers’ business focus could significantly reduce their demand for wind blades. For instance, General Electric,GE, the parent corporation of GE Wind, is a highly diversified company that operates in a number of different industries and could decide to devote more resources to operations outside of wind energy or cease selling wind turbines altogether. In addition, we expect that GE Wind will utilize LM for a substantial percentage of its wind blade production in the future. If any of our customers change their business focus, including a strategic shift to insource a material portion of its wind blade production requirements, it could materially harm our business and results of operations.

We have experienced in the past, and our future wind blade production could be affected by, operating problems at our facilities, which may materially harm our operating results and financial condition.

Our wind blade manufacturing processes and production capacity have in the past been, and could in the future be, disrupted by a variety of issues, including:

The cost of repeated or prolonged interruptions, reductions in production capacity, or the repair or replacement of complex and sophisticated tooling and equipment may be considerable and could result in damages under or the termination of our long-term supply agreements or penalties for regulatory non-compliance, any of which could materially harm our business, operating results and financial condition.

We operate a substantial portion of our business in international markets and we may be unable to effectively manage a variety of currency, legal, regulatory, economic, social and political risks associated with our global operations and those in developing markets.

We currently operate manufacturing facilities in the United States, China, Mexico and Turkey, and we intend to further expand our operations worldwide to meet customer demand. We haverecently entered into lease agreements with third parties to lease new manufacturing facilities in Mexico and Turkey, and we expect to commencecommenced operations at these new facilities in the second halfthird quarter of 2016. We have also entered into a new lease with a third party for a third manufacturing facility in Juárez, Mexico, and we expect to commencecommenced operations at this facility in the first half ofJanuary 2017. For the three months ended March 31, 20162017 and for the years ended December 31, 2016, 2015 and 2014, 71%76%, 75%, 74% and 55%, respectively, of our net sales were derived from our international operations and we expect that a substantial portion of our projected revenue growth will be derived from those operations. Our overall success depends, in part, upon our ability to succeed in differing legal, regulatory, economic, social and political conditions. The global nature of our operations is subject to a variety of risks, including:

In particular, our operations in China are subject to a variety of specific risks, which may adversely affect our business, including:

We also operate in developing markets, which have, in the past, experienced, and may in the future experience, social and political unrest. For example, Turkey has experienced problems with domestic terrorist and ethnic separatist groups.groups and attempted military coups. The issue of civil rights for Kurdish citizens remains a potential source of political instability, which may be exacerbated by continuing instability in the Middle East.

In addition, Juarez,Juárez, Mexico, the location of our three Mexico manufacturing facility,facilities, has in the past been subject to violence related to drug trafficking, including kidnappings and killings. This could negatively impact our ability to hire and retain personnel, especially senior U.S. managers, to continue to work at the facility,these facilities, or disrupt our operation in other ways, which could materially harm our business.

As we continue to operate our business globally, our success will depend, in part, on our ability to anticipate and effectively manage these and other related risks. We may be unsuccessful in developing and implementing policies and strategies that will be effective in managing these risks in each country where we do business or conduct operations. Our failure to manage these risks successfully could materially harm our business, operating results and financial condition.

Although a majority of our manufacturing facilities are located outside the United States, our business is still heavily dependent upon the demand for wind energy in the United States and any downturn in demand for wind energy in the United States could materially harm our business.

We have developed a global footprint to serve the growing wind energy market worldwide and have wind blade manufacturing facilities in the United States, China, Mexico and Turkey. Although a majority of our manufacturing facilities are located outside of the United States, we believe that historically more than half of the wind blades that we produced were deployed in wind farms located within the United States. Our Iowa and Mexico manufacturing facilities manufacture wind blades that are generally deployed within the United States. In

addition, we export wind blades from our China manufacturing facility to the United States. Demand for wind energy and our wind blades in the United States could be adversely affected by a variety of reasons and factors, and any downturn in demand for wind energy and our wind blades in the United States could materially harm our business.

Our focus on wind energy markets in a limited number of geographic areas could result in a material harm to our business, financial condition and results of operations.

The wind energy industry continues to be dependent on developments within a relatively small number of markets and we have developed our global manufacturing footprint and long-term growth strategy to serve these markets. We cannot assure you that these wind energy markets will continue to demand increasing amounts of wind energy going forward. For example, the connection or access of wind turbines to a power grid is very important when locating wind turbines. In each of these markets, there are various laws, rules or regulations that govern the connection or access of wind turbines to the power grid. If the customers of our customers fail to obtain a connection or access to power grids on a timely basis and on economically reasonable terms and enter agreements to sell the electrical energy generated or the number of MW hours that any of these markets consumes declines, our business, financial condition and results of operations could be materially harmed. In addition, if one of those markets does not develop in line with our expectations, our business, financial condition and results of operations could be materially harmed.

We may not achieve the long-term growth we anticipate if wind turbine OEMs do not continue to shift from in-house production of wind blades to outsourced wind blade suppliers and if we do not expand our customer relationships and add new customers.

Many wind turbine OEMs rely on in-house production of wind blades for some or all of their wind turbines. Our growth strategy depends in large part on the continued expansion of our relationships with our current wind blade customers, and the addition of new key customers. SomeThe majority of our customers possess the financial, engineering and technical capabilities to produce their own wind blades and many source wind blades from multiple suppliers. Our existing customers may not expand their wind energy operations or, if they do, they may not choose us to supply them with new or additional quantities of wind blades. Our collaborative dedicated supplier model for the manufacture of wind blades is a significant departure from traditional vertically integrated methods. As is typical for rapidly evolving industries, customer demand for new business models is highly uncertain. For instance, although we have entered into long-term supply agreements with three customers, Vestas, Gamesa (which, in June 2016 announced a planned mergerApril 2017, merged with Siemens’ wind business)Siemens Wind Power) and Nordex, (which acquired Acciona in April 2016), that also produce wind blades for their wind turbines in-house, we may not be able to maintain these customer relationships or enter into similar arrangements with new customers that produce wind blades in-house in the future. In addition, although GE Wind has historically outsourced all of their wind blade production requirements, we expect that GE Wind will utilize LM for a substantial percentage of its wind blade production in the future. Our business and growth strategies depend in large part on the continuation of a currentthe trend toward outsourcing manufacturing. If that trend does not continue or we are unsuccessful in persuading wind turbine OEMs to shift from in-house production to the outsourcing of their wind blade manufacturing, we may not achieve the long-term growth we anticipate and our market share could be limited.

A drop in the price of energy sources other than wind energy, or our inability to deliver wind blades that compete with the price of other energy sources, may materially harm our business, financial condition and results of operations.

We believe that a customer’s decision to purchase wind blades is to a significant degree driven by the relative cost of electricity generated by wind turbines compared to the applicable price of electricity from the utility grid and the cost of traditional and other renewable energy sources. Decreases in the prices of electricity from the relevant utility grid or from renewable energy sources other than wind energy would harm the market for wind blades. In particular, a drop in natural gas prices could lessen the appeal of wind-generated electricity.

Technological advancements or the construction of a significant number of power generation plants, including nuclear, coal, natural gas or power plants utilizing other renewable energy technologies, government support for other forms of renewable energy or construction of additional electric transmission and distribution lines could reduce the price of electricity produced by competing methods, thereby making the purchase of wind blades less attractive to customers economically. For example, in March 2017, President Trump signed an executive order that is intended to promote the domestic coal industry, which may make the cost of electricity generated from coal more cost competitive. The ability of energy conservation technologies, public initiatives and government incentives to reduce electricity consumption or support other forms of renewable energy could also lead to a reduction in the price of electricity, which would undermine the attractiveness of wind turbines, and, in turn, our wind blades. If prices for electricity generated by wind turbines are not competitive, our business, financial condition and results of operations may be materially harmed.

If any precision molding and assembly systems needed for our manufacturing process contains a defect or is not fabricated and delivered in a timely manner, our ongoing manufacturing operations, business, financial condition and results of operation may be materially harmed.

We custom fabricate many of the precision molding and assembly systems used in our facilities. Our customers also have the option of using third-party manufacturers to produce their custom tooling. If any piece of equipment fails, is determined to produce nonconforming or defective products or is not fabricated and delivered in a timely manner, whether produced by us or a third party, our wind blade production could be interrupted and we could be subject to contractual penalties, warranty claims, loss of revenues and damage to our customer relationships, among other consequences.

Our long-term supply agreements and our backlog are subject to reduction within contractual parameters and we may not realize all of the expected revenue.

Our current long-term wind blade supply agreements generally establish annual purchase requirements on which we rely for our future production and financial forecasts. However, the timing and volume of purchases, within certain parameters, may be subject to change by our customers. In some instances, our customers have the contractual right to require us to reduce the number of manufacturing lines committed to them and correspondingly reduce their minimum annual purchase requirements. Additionally, our minimum annual purchase commitments could potentially understate the actual net sales that we are likely to generate in a given period or periods if all of our long-term supply agreements remain in place and pricing remains materially unchanged. Such minimum annual purchase requirements could also potentially overstate the actual net sales that we are likely to generate in a given period or periods if one or more of our long-term supply agreements were to be terminated by our customers for any reason. As a result, we may not realize the revenue we expect under our long-term supply agreements or pursuant to our backlog, which we define as the value of purchase orders received less the revenue recognized to date on those purchase orders. In addition, fulfillment of our backlog may not result in profits.

The long sales cycle involved in attracting new customers may make the timing of our revenue difficult to predict and may cause our operating results to fluctuate.

The complexity, expense and long-term nature of our supply agreements generally require a lengthy customer education, evaluation and approval process. It can take us from several months to years to identify and attract new customers, if we are successful at all. This long sales cycle for attracting and retaining new customers subjects us to a number of significant risks that may materially harm our business, results of operation and financial condition over which we have limited control, including fluctuations in our quarterly operating results. In addition, we may incur substantial expenses and devote significant management effort to develop potential relationships that do not result in agreements or revenue and may prevent us from pursuing other opportunities.

We encounter intense competition for limited customers from other wind blade manufacturers, as well as in-house production by wind turbine OEMs, which may make it difficult to enter into long-term supply agreements, keep existing customers and potentially get new customers.

We face significant competition from other wind blade manufacturers, and this competition may intensify in the future. The wind turbine market is characterized by a relatively small number of large OEMs. In addition, a significant percentage of wind turbine OEMs, including fourmost of our current customers, produce some of their own wind blades in-house. As a result, we compete for business from a limited number of customers that outsource the production of wind blades. We also compete with a number of wind blade manufacturers in China, who are growing in terms of their technical capability and aspire to expand outside of China. Many of our competitors have more experience in the wind energy industry, as well as much greater financial, technical or human resources than we do, which may limit our ability to compete effectively with them and maintain or improve our market share. Additionally, our long-term supply agreements dedicate capacity at our facilities to our customers, which may also limit our ability to compete if our facilities cannot accommodate additional capacity. If we are unable to compete effectively for the limited number of customers that outsource production of wind blades, our ability to enter into long-term supply agreements with potential new and existing customers may be materially harmed.

We could be affected by increasing competition from new and existing industry participants and industry consolidation.

The markets in which we operate are increasingly competitive and any failure on our part to compete effectively on an ongoing basis could materially harm our business, results of operations or financial condition. The key factors affecting competition in the wind energy industry are the capacity and quality of products, technology, price, the ability to fulfill local market requirements and the scope, cost and quality of maintenance services, training and support.

Competition in the wind energy industry has intensified in recent years as a result of a number of factors, including international expansion by existing industry participants exploiting new markets, particularly as political will around the issues of global warming and the environment become more prominent to the political agenda in those new markets. There has also been increasing pressure from Asian manufacturers rapidly improving the quality and reliability of their technologies, and considering moving out of their local markets and into international cross border transactions. Market entry by certain large industrial groups, including those previously unconnected to the wind energy market, through acquisitions and license agreements and numerous greenfield establishments in certain markets, also poses a competition risk.

The competitive environment in the wind energy industry may become more challenging in the years ahead, particularly in the event of greater consolidation in the industry, leading to greater market power and “economies of scale” by such market players which translate into being able to offer greater “cost of energy” savings to wind power plant customers. For example, GE Windcompleted its acquisition of LM in April 2017 and also acquired Alstom S.A.’s power business in 2015,2015; Nordex recently completed its acquisition of Acciona and in June 2016, and Gamesa announced a planned mergermerged with Siemens’ wind business.Siemens Wind Power in April 2017. These transactions or further consolidation in the wind energy industry may have an adverse impact on our business in the future, including, without limitation, reduced demand for our products and services, product innovation, changes in pricing and similar factors, including any competitor’s attempt to duplicate our collaborative dedicated supplier model. Such events could materially harm our business, results of operations, financial condition or prospects.

Significant increases in the prices of raw materials or components that cannot be reflected in the price of our products could negatively affect our operating margins.

The prices of our raw materials and components are subject to price fluctuations resulting from volatility of supply and demand in world markets. Under our long-term supply agreements, our customers generally commit to purchase minimum annual volumes and prices for wind blades are generally set as of the

date of our supply agreements and adjusted annually, or in some cases more frequently, for the cost of raw material and our operating expenses in certain cases. As a result, the competitive nature of the wind blade market and our long-term supply agreements with our customers may delay or prevent us from passing cost increases in raw materials and components on to our customers. Significant increases in the price of raw materials or components used in our manufactured wind blades that cannot be reflected in the price of our products, could negatively affect our operating margins and materially harm our business, operating results or financial condition.

We could experience shortages of raw materials or components critical to our manufacturing needs, which may hinder our ability to perform under our supply agreements.

We rely upon third parties for raw materials, such as fiberglass, carbon, resins, foam core and balsa wood, and various components for the manufacture of our wind blades. Some of these raw materials and components may only be purchased from a limited number of suppliers. For example, balsa wood is only grown and produced in a limited number of geographies and is only available from a limited number of suppliers. Additionally, our ability to purchase the appropriate quantities of raw materials is constrained by our customers’ transitioning wind blade designs and specifications. As a result, we maintain relatively low inventory and acquire raw materials and components as needed. Due to significant international demand for these raw materials from many industries, we may be unable to acquire sufficient quantities or secure a stable supply for our manufacturing needs. If shortages or delays occur, we may be unable to provide our products to our customers on time, or at all. In addition, a disruption in any aspect of our global supply chain caused by transportation delays, customs delays, cost issues or other factors could result in a shortage of raw materials or components critical to our manufacturing needs. Any supply shortages, delays in the shipment of materials or components from third party suppliers, or changes in the terms on which they are available could disrupt or materially harm our business, operating results and financial condition.

Certain of our long-term supply agreements are highly dependent upon a limited number of suppliers of raw materials.

Our ability to perform under certain of our long-term supply agreements is currently, and may continue to be in the future, highly dependent on a limited number of suppliers of raw materials. For instance, our agreements with certain customers require us or our customers to purchase raw materials from a single supplier unless additional suppliers are evaluated and found to satisfy the requirements set out in those agreements. In 2015, for example, our ability to supply wind blades to one of our customers was constrained because our customer, who under our agreement was required to procure a sufficient supply of a specific type of material, was unable to procure the material from a single source supplier. Should any of these suppliers of raw materials experience production delays or shortages, have their operations interrupted or otherwise cease or curtail their operations, this may disrupt or materially harm our business, operating results and financial condition.

Significant increases in the cost of transporting our wind blades could negatively affect the demand for our products.

A significant portion of our customers’ costs are transportation costs related to the transport of our manufactured wind blades to their customers’ wind farms. Demand for our products could be negatively affected if the costs our customers bear to transport our wind blades increase.

The nature of our manufacturing processes and unanticipated changes to those processes could significantly reduce our manufacturing yields and product reliability, which could materially harm our business, operating results and financial condition.

The manufacture of our wind blades involves highly complex and precise processes which may be dictated by our customers’ requests requiring production in highly controlled environments. Changes in our

manufacturing processes or that are required by our customers could affect product reliability. Furthermore, many of our processes are manual to facilitate production flexibility and compliance with customer requirements. A manually dependent manufacturing process can limit capacity and increase production costs. In some cases, existing manufacturing techniques may be insufficient to achieve the volume or cost targets of our customers. For example, our manufacturing processes may at times require a quantity of raw materials greater than the quantity for which we have contracted, making it difficult for us to achieve the targeted cost levels negotiated with our customers. In order to achieve targeted volume and cost levels, we may need to increase the quantity of raw materials for which we contract or develop new manufacturing processes and techniques. While we continue to devote substantial efforts to the improvement of our manufacturing techniques and processes, we may not achieve manufacturing volumes and cost levels in our manufacturing activities that will fully satisfy customer demands, which could materially harm our business, operating results and financial condition.

Our reserves for warranty expenses might not be sufficient to cover all future costs.

We provide warranties for all of our products, including parts and labor, for periods that typically range from two to five years depending on the product sold. If a wind blade is found to be defective during the warranty period as a result of a defect in workmanship or materials, or if we are required to cover remediation expenses or other potential remedies, in addition to our regular warranty coverage we may need to repair or replace the wind blade (which could include significant transportation, installation and erection costs) at our sole expense. Our estimate of warranty expense requires us to make assumptions about matters that are highly uncertain, including future rates of product failure, repair costs, shipping and handling and de-installation and re-installation costs at customers’ sites. Our assumptions could be materially different from the actual performance of our products and these remediation expenses in the future. The expenses associated with wind blade repair and remediation activities can be substantial and may include changes to our manufacturing processes. If our estimates prove materially incorrect, we could incur warranty expenses that exceed our reserves and be required to make material unplanned cash expenditures, which could materially harm our business, operating results and financial condition.

We may not be able to meet our customers’ future wind blade supply demands, which may hinder our customer relationships and reputation.

Historically, our existing customers’ demand and MW capacity goals have mirrored the anticipated growth of the wind energy industry. Given the importance of wind energy capture, turbine reliability and cost to power producers, the size, quality and performance of wind blades have become highly strategic to our OEM customers. If we are unable to maintain future manufacturing capacity at levels that meet our customers’ increasing demands, including with respect to volume, technical specifications, or commercial terms, our existing customers may seek relationships with, or give priority to, other wind blade manufacturers or may use or develop their own internal manufacturing capabilities to meet their increased demand, which could materially harm our business, operating results and financial condition. In addition, our reputation could be materially harmed if we are unable to satisfy the requirements of our customers.

We rely on our research and development efforts to remain competitive, and we may fail to develop on a timely basis new wind blade manufacturing technologies that are commercially attractive or permit us to keep up with customer demands.

The market for wind blades is subject to evolving customer needs and expectations. Our research and development is invested in developing faster and more efficient manufacturing processes in order to build the new wind blades designed by our customers that more effectively capture wind energy and are adaptable to new growth segments of the wind energy market. Research and development activities are inherently uncertain and the results of our in-house research and development may not be successful. In addition, our competition may adopt more advanced technologies or develop wind blades that are more effective or commercially attractive. We believe that our future success will depend in large part upon our ability to be at the forefront of technological

innovation in the wind energy industry and to rapidly and cost-effectively adapt our wind blade manufacturing processes to keep pace with changing technologies, new wind blade design and changing customer needs. If we are unable to do so, our business, operating results, financial condition and reputation could be materially harmed.

Many of our long-term supply agreements contain liquidated damages provisions, which may require us to make unanticipated payments to our customers.

Many of our long-term supply agreements contain liquidated damages provisions in the event that we fail to perform our obligations thereunder in a timely manner or in accordance with the agreed terms, conditions and standards. Our liquidated damages provisions generally require us to make a payment to the customer if we fail to deliver a product or service on time. We generally try to limit our exposure under any individual long-term supply agreement to a maximum penalty. Nevertheless, if we incur liquidated damages, they may materially harm our business, operating results and financial condition. For example, the supply agreements with respect to our China, Mexico and Iowa facilities provide that each party will bear its own costs except that the prevailing party in a legal action arising thereunder is entitled to its reasonable costs and expenses, including reasonable attorneys’ fees.

We depend on third parties for certain construction, maintenance, engineering, transportation, warehousing and logistics services, and failures of those third parties to perform their obligations may in turn impede our ability to perform our obligations.

We contract with third parties for certain services relating to the design, construction and maintenance of various components of our production facilities and other systems. If these third parties fail to comply with their obligations:

Any of these events could have a material adverse effect on our business, operating results or financial condition. Our customers also contract with third parties for the transportation of the products we manufacture. In particular, a significant portion of the goods we manufacture are transported to different countries, which requires sophisticated warehousing, logistics and other resources. If our customers fail to contract with third parties for certain construction, maintenance, engineering, transportation, warehousing and logistics services, or there are any disruptions, delays or failures in these services, this could have a material adverse effect on our business, operating results or financial condition.

Various legislation, regulations and incentives that are expected to support the growth of wind energy in the United States and around the world may not be extended or may be discontinued, phased out or changed, or may not be successfully implemented, which could materially harm wind energy programs and materially decrease demand for our wind blades.

The U.S. wind energy industry is dependent in part upon governmental support through certain incentives including federal tax incentives and renewable portfolio standard or RPS,(RPS) programs and may not be economically viable absent such incentives. Government-sponsored tax incentive programs including the Production Tax Credit for Renewable Energy, or PTC, and to a lesser extent, the Investment Tax Credit, or ITC, are expected to support the U.S. growth of wind energy. The PTC provided the owner of a wind turbine placed in operation before January 1, 2015 with a ten year credit against its U.S. federal income tax obligations based on the amount of electricity generated by the wind turbine.

Although the PTC was extended in December 2015 for wind power projects through December 31, 2019, as currently contemplated, the PTC rate is being phased out over the term of the PTC extension. Specifically, as currently contemplated, the PTC will remain at the same rate in effect at the end of 2014 for wind power projects that commence construction by the end of 2016, and thereafter will be reduced by 20% per year in 2017, 2018 and 2019, respectively.

TheIn 2015, the EPA recently enacted the Clean Power Plan, which is also intended to promote the growth of renewable energy. However, in February 2016, the United States Supreme Court issued a stay of the EPA’s implementation of the Clean Power Plan until the D.C. Circuit of the United States Court of Appeals reviews the merits of multiple lawsuits challenging the legality of the Clean Power Plan. If the Clean Power Plan is not successfully implemented, demand for our wind blades may be materially decreased. In addition, in March 2017, President Trump signed an executive order that requires, among other things, that the EPA review the Clean Power Plan and publish a rule to either suspend, revise or rescind it.

In addition, many state governments have adopted measures designed to promote wind energy. For example, according to AWEA, at the state level, as of December 31, 2016, 29 states, as well as the District of Columbia, have implemented RPS programs that mandate that a specific percentage of electricity sales in a state come from renewable energy within a specified period. However, RPS programs have been challenged lately and they may not continue going forward. These programs have spurred significant growth in the wind energy industry in the United States and a corresponding increase in the demand for our manufactured wind blades. However, although the U.S. government and several state governments have adopted these various programs that are expected to drive the growth of wind energy, they may approve new or additional programs that might hinder the wind energy industry and therefore negatively impact our business, operating results or financial condition. See “Risk Factors—Risks Related to Our Wind Blade Business—The results of the 2016 United States presidential and congressional elections has created regulatory uncertainty for our business and the wind energy sector and may materially harm our business, financial condition and results of operations.”

China is currently implementing a five-year planits 13^th 5-Year Plan with a goal of 15% energy from non-fossil fuel sources and targeting 250210 GWs of grid-connected wind capacity by 2020, according to its National Development and Reform Commission, and employs preferential feed-in tariff schemes, in addition to local tax-based incentives. Mexico has established strict targets, aiming for 35% renewable energy by 2024 and 50% by 2050, according to MAKE, which it is facilitating through tax incentives. Large European Union members have renewable energy targets for 2020 of between 13% and 49% of all energy use derived from renewable energy sources, according to MAKE. Turkey enacted Law No. 5346 in 2005 to promote renewable-based electricity generation within its

domestic electricity market by introducing tariffs and purchase obligations for distribution companies requiring purchases from certified renewable energy producers. The World Bank also provided to Turkey an aggregate of $600 million of loan proceeds to encourage investors to construct generation plants with renewable energy resources. These programs have spurred significant growth in the wind energy industry internationally and a corresponding increase in the demand for our manufactured wind blades. However, although foreign governments have adopted various programs that are expected to drive the growth of wind energy, they may approve new or additional programs going forward that might hinder the wind energy industry and therefore negatively impact our business as a result. For example, foreign governments may decide to reduce or eliminate these economic incentives for political, financial or other reasons. They may also favor other forms of energy, including current and new sources of energy such as solar, nuclear and hydropower.

Because of the long lead times necessary to develop wind energy projects, any uncertainty or delay in adopting, extending or renewing these incentives beyond their current or future expiration dates could negatively impact potential wind energy installations and result in industry volatility. There can be no assurance that the PTC, the Clean Power Plan or other governmental programs or subsidies for renewable energy will remain in effect in their present form or at all, and the elimination, reduction, or modification of these programs or subsidies could materially harm wind energy programs in the United States and international markets and materially decrease demand for our wind blades and, in turn, materially harm our business, operating results and financial condition.

We may not be able to obtain, or agree on acceptable terms and conditions for, government tax credits, grants, loans and other incentives for which we have in the past applied or may in the future apply, which may materially harm our business, operating results and financial condition.

We have in the past and may in the future rely, in part, on tax credits, grants, loans and other incentives under U.S. and foreign governmental programs to support the construction of new plants and expansion of existing manufacturing facilities. We may not be successful in obtaining these tax credits, grants, loans and other incentives, and the tax and other incentives that have already been approved may not be continued in the future. Our ability to obtain funds or incentives from government sources is subject to the availability of funds under applicable governmental programs and approval of our applications to participate in these programs. The application process for these funds and other incentives is and will be highly competitive. We may not be able to satisfy the requirements and milestones imposed by the granting authority as conditions to receipt of the funds or other incentives, the timing of the receipt of the funds may not meet our needs, and, even if obtained, we may be unable to successfully execute on our business plan. Moreover, not all of the terms and conditions associated with these incentive funds have been disclosed to us, and once disclosed, there may be terms and conditions with which we are unable to comply or that are commercially unacceptable to us. Further, participation in certain programs may require us to notify the federal government of certain intellectual property we develop and comply with applicable regulations in order to protect our interests in that intellectual property. In addition, these federal governmental programs may require us to spend a portion of our own funds for every incentive dollar we receive or are permitted to borrow from the government and may impose time limits during which we must use the funds awarded to us that we may be unable to achieve. If we are unable to obtain or comply with the terms of these tax credits, grants, loans or other incentives, our business, operating results and financial condition may be harmed.

Adverse weather conditions could impact the wind energy industry in some regions and could materially harm our business, operating results and financial condition.

Our business may be subject to fluctuations in sales volumes due to adverse weather conditions that could delay the erection of wind turbines, the installation of wind blades and the ability of wind turbines to generate electricity efficiently. Moreover, any remediation efforts we could be required to undertake pursuant to wind blade warranties could be delayed or otherwise adversely impacted by poor weather. Although our customer base and geographicalmanufacturing footprint is geographically diversified, enduring weather patterns or seasonal variations may impact the expansion of the wind energy industry in certain regions. A resulting reduction or delay in demand for the wind blades we manufacture for our customers could materially harm our business, operating results and financial condition.

In mid-2015, our Audit Committee conducted an internal investigation into allegations of improper business dealings in China. While the investigation did not substantiate the allegations, we ultimately terminated our former Senior Vice President—Asia, then serving as a consultant to the Company, in January 2016 for material violations of his agreements with us and of Company policies, which came to light subsequent to the completion of the internal investigation. Any misconduct that the initial investigation or our subsequent review of the activities of our former Senior Vice President—Asia failed to uncover could have a material adverse effect on our operations generally.

In June 2015, our Audit Committee was notified of allegations that, among other things, our former Senior Vice President—Asia requested personal compensation from suppliers in return for doing business with the Company in China and made excessive payments for capital expenditures. The Audit Committee directed a U.S.-based law firm, assisted by a forensic accounting firm and a law firm with local resources in China, to initiate an investigation into the conduct of the former Senior Vice President—Asia. Although the investigation did not uncover any illegal conduct, the investigation did not disprove the allegations. We subsequently accelerated the implementation of enhanced operational procedures, processes and controls relating to our China operations pursuant to recommendations arising out of the internal investigation and our review of our China operations. This process is currently ongoing.

Although the results of the internal investigation were inconclusive regarding the allegations relating to our former Senior Vice President—Asia, in early August 2015, we entered into a transition agreement with our former Senior Vice President—Asia pursuant to which he transitioned out of his role as Senior Vice President—Asia at the end of 2015. Pursuant to the transition agreement, he was to serve in a consulting capacity to facilitate an orderly transition of operations in China through 2016 and 2017. In January 2016, we subsequently determined that our former Senior Vice President—Asia, then serving as a consultant to the Company, had materially violated the terms of the transition agreement, including the non-compete provisions, and had materially violated Company policies. Following our discovery of these violations, we terminated his consultancy for cause in January 2016 pursuant to the terms of the transition agreement and he is no longer associated with the Company. Subsequent to his termination, we found further evidence that our former Senior Vice President—Asia and three of his subordinates in China, who we also terminated in January 2016, likely engaged in improper conduct involving the misuse of funds in violation of Company policies.

Additional facts or allegations may exist that the internal investigation or our subsequent review did not uncover. The persons that our investigative teams interviewed may have omitted facts or may have been untruthful, and the investigative teams may not have had access to all relevant documents or persons relating to the subject of the investigation. If new evidence concerning the allegations is found in the future, or if new allegations are made or other similar issues arise or are uncovered, our Chinese operations could be materially disrupted, our suppliers and customers may cease to do business with us, our reputation in the marketplace may be materially harmed, we may be required to terminate additional key employees, and we may need to incur substantial legal and accounting costs in investigating and resolving these matters. If any of these risks materialize, we could be subject to fines, penalties, prosecution or other impacts, which could result in a decline in our stock price or materially and adversely affect our business, operating results, liquidity and financial condition.

Our long-term growth and success is dependent upon retaining our senior management and attracting and retaining qualified personnel, and we may be negatively impacted by the transition and subsequent termination of our former Senior Vice President—Asia.personnel.

Our growth and success depends to a significant extent on our ability to attract and retain highly qualified research and development, management, manufacturing, marketing and other key personnel including engineers in our various locations. In addition, we rely heavily on our management team, including Steven C. Lockard, our Chief Executive Officer,Officer; Mark R. McFeely, our Chief Operating Officer, Wayne G. Monie, our Chief Manufacturing Technology Officer,Officer; William E. Siwek, our Chief Financial Officer,Officer; and other senior management. The inability to

recruit and retain key personnel or the unexpected loss of key personnel may materially harm our business, operating results and financial condition. Hiring those persons may be especially difficult because of the specialized nature of our business and our international operations. If we cannot attract and retain qualified personnel, or if we lose the services of Messrs. Lockard, McFeely Monie or Siwek, other key members of senior management or other key personnel, our ability to successfully execute our business plan, market and develop our products and serve our customers could be materially and adversely affected. In addition, because of our reliance on our management team, our future success depends, in part, on its ability to identify and develop talent to succeed its senior management. The retention of key personnel and appropriate senior management succession planning will continue to be critical to the successful implementation of our future strategies.

In addition, in August 2015, we entered into a transition agreement with our former Senior Vice President—Asia pursuant to which he transitioned out of this role at the end of 2015. Although our former Senior Vice President—Asia was to serve in a consulting capacity with the Company in 2016 and 2017, following our discovery that he had materially violated the terms of the transition agreement, including the non-compete provisions, and materially violated Company policies, we terminated his consultancy for cause in January 2016 pursuant to the terms of the transition agreement and he is no longer associated with the Company. We have also terminated three other senior managers in China, who were his subordinates, for related offenses. Some of our key management, technical and engineering personnel in China may decide to leave the Company following our recent management transition in China, and the transition may be disruptive to our China operations generally. Our former Senior Vice President – Asia has filed an arbitration claim challenging our termination of the transition agreement for cause and the three subordinates may also challenge our termination of their employment. See “Business—Legal Proceedings” for more information. We may need to incur material legal and other costs in resolving these matters under Chinese labor and employment laws and regulations, which are complex, and the ultimate outcome is difficult to predict in China. We have incurred and may incur substantial additional costs in managing our Chinese business in the future, and our U.S.-based management team may continue to be required to dedicate a significant amount of time and attention to managing the Chinese operations until China-based management can operate independently. For example, Mr. Monie functioned as our Asia CEO from August 2015 through March 2016. If any of these risks materialize, it could have a material adverse effect on our business, operating results or financial condition.

Risks Related to Our Business as a Whole

We may not be able to manage our future growth effectively, which may materially harm our business, operating results and financial condition.

We expect to continue to expand our business significantly to meet our current and expected future contractual obligations and to satisfy anticipated increased demand for our products. To manage our anticipated expansion, we believe we must scale our internal infrastructure, including establishing additional facilities, improve our operational systems and procedures and manufacturing capabilities, continue to enhance our

compliance and quality assurance systems, train and manage our growing employee base, and retain and add to our current executives and management personnel. Rapid expansion of our operations could place a significant strain on our senior management team, support teams, manufacturing lines, information technology platforms and other resources. Difficulties in effectively managing the budgeting, forecasting and other process control issues presented by any rapid expansion could materially harm our business, prospects, results of operations or financial condition. Our inability to implement operational improvements, generate and sustain increased revenue and manage and control our cost of goods sold and operating expenses could impede our future growth and materially harm our business, operating results and financial condition.

We have a history of net losses and may not achieve or maintain profitability in the future.

We have a history of significant net operating losses, including a net loss of $6.6 million for the year ended December 31, 2014. InFor the three months ended March 31, 20162017 and infor the years ended December 31, 2015

2016 and 2013,2015, we had net income of $1.7$3.5 million, $7.7$13.8 million and $1.3$7.7 million, respectively. As a result of thesepast operating losses, and the effect of redeemable preferred share cumulative dividends earned and the accretion to redemption amounts, we had an accumulated deficit of $191.9$180.0 million as of March 31, 2016.2017. Although we were profitable for the three months ended March 31, 2016,2017, we may not be able to achieve profitability for the current or any future fiscal year. In addition, we expect our operating expenses to increase as we continue to seek new customer relationships and expand our operations. Our ability to achieve and maintain profitability depends on a number of factors, including the growth rate of the wind energy industry, the competitiveness of our wind blades and our ability to successfully build new and expand existing manufacturing facilities and increase production capacity at existing plants. We may incur significant losses in the future for a number of reasons, including due to the other risks described elsewhere in this prospectus, and we may encounter unforeseen expenses, difficulties, complications and delays and other unknown events. In addition, as a public company, we will incur additional significant legal, accounting and other expenses that we did not incur as a private company. As a result, our operations may not achieve profitability in the future and, even if we do achieve profitability, we may not be able to maintain or increase it.

Our financial position, revenue, operating results and profitability are difficult to predict and may vary from quarter to quarter, which could cause our share price to decline significantly.

Our quarterly revenue, operating results and profitability have varied in the past and are likely to vary significantly from quarter to quarter in the future. For example, our quarterly results have ranged from an operating profit of $16.6$17.5 million for the three months ended December 31, 2015June 30, 2016 to an operating loss of $2.7 million for the three months ended March 31, 2015. The factors that are likely to cause these variations include:

As a result, our revenue, operating results and profitability for a particular period are difficult to predict and may decline in comparison to corresponding prior periods regardless of the strength of our business. It is also possible that in some future periods our revenue, operating results and profitability may not meet the expectations of securities analysts or investors. If this occurs, the trading price of our common stock could fall substantially, either suddenly or over time, and our business, operating results and financial condition would be materially harmed.

The fluctuation of foreign currency exchange rates could materially harm our financial results.

Since we conduct a significant portion of our operations internationally, our business is subject to foreign currency risks, including currency exchange rate fluctuations. The exchange rates are affected by, among other things, changes in political and economic conditions. For example, an increase in our Turkey sales and operations will result in a larger portion of our net sales and expenditures being denominated in the Euro and Turkish Lira, or TRY.Lira. Significant fluctuations in the exchange rate between TRYthe Turkish Lira and the U.S. dollar, TRYthe Turkish Lira and the Euro or the Euro and the U.S. dollar may adversely affect our revenue, expenses, as well as the value of our assets and liabilities. Similarly, an increase in our China sales and operations will result in a larger portion of our net sales and expenditures being denominated in Chinese Renminbi, or RMB.Renminbi. The Chinese government controls the procedures by which RMBthe Chinese Renminbi is converted into other currencies, and conversion of RMBthe Chinese Renminbi generally requires government consent. As a result, RMBthe Chinese Renminbi may not be freely convertible into other currencies at all times. If the Chinese government institutes changes in currency conversion procedures, or imposes restrictions on currency conversion, those actions may materially harm our business, liquidity, financial condition and operating results. In addition, significant fluctuations in the exchange rate between RMBthe Chinese Renminbi and U.S. dollars may adversely affect our expenses as well as the value of our assets and liabilities. To the extent our future revenues are generated outside of the United States in currencies other than the U.S. dollar, including the Euro, TRY, RMBthe Turkish Lira, the Chinese Renminbi or Mexican Peso, among others, we will be subject to increased risks relating to foreign currency exchange rate fluctuations which could materially harm our business, financial condition and operating results.

The outcome of the United Kingdom’s referendum on membership in the European Union could have a material impact on global financial markets and on the European economy, and could result in material fluctuations in foreign currency exchange rates, any or all of which could have a material adverse effect on us.

In June 2016, a referendum was held on the United Kingdom’s membership in the European Union, resulting in a vote in favor of leaving the European Union. The vote creates an uncertain political and economic environment in the United Kingdom and potentially across other European Union member states, which may last for a number of months or years. Article 50 of the Treaty of the European Union, or Article 50, allows a member state to decide to withdraw from the European Union in accordance with its own constitutional requirements. The formal process for leaving the European Union will be triggered only when the United Kingdom delivers an Article 50 notice to the European Council, although informal negotiations around the terms of any exit may be held before such notice is given. Delivery of the Article 50 notice will start a two-year period for the United Kingdom to exit from the European Union, although this period can be extended with the unanimous agreement of the European Council. Without any such extension (and assuming that the terms of withdrawal have not already been agreed), the United Kingdom’s membership in the European Union would end automatically on the expiration of that two-year period.

The result of the referendum means that the long-term relationship of the United Kingdom with the European Union is unclear and that there is considerable uncertainty as to when any changes to such relationship will be agreed and implemented. There is also considerable uncertainty as to whether, following any Article 50 notice being given, the arrangements for the United Kingdom to leave the European Union will be agreed upon within the two-year period and, if not, whether an extension of that time period would be agreed upon. It is also possible that the European Union will pressure the United Kingdom to exit prior to the end of the two-year period or that the United Kingdom’s exit from the European Union will be effected without mutually acceptable terms being agreed upon.

The political and economic instability created by the United Kingdom’s vote to leave the European Union has caused and may continue to cause significant volatility in global financial markets and the relative value of global currencies, including the Euro in particular, which may adversely affect our revenue, expenses, as well as the value of our assets and liabilities. Depending on the terms reached regarding any exit from the European Union, it is possible that there may be other adverse practical and/or operational implications on our business and for our customers doing business in Europe. Consequently, no assurance can be given as to the

impact of the referendum outcome and, in particular, no assurance can be given that our operating results, financial condition and prospects would not be adversely impacted by the result.

Our manufacturing operations and future growth are dependent upon the availability of capital, which may be insufficient to support our capital expenditures.

Our current wind blade manufacturing activities and future growth will require substantial capital investment. For the years ended December 31, 20152016 and 2014,2015, our capital expenditures were $31.4$40.5 million and $26.3$31.4 million, respectively, including assets acquired under capital lease in 2016 and 2015 and 2014 of $5.0$10.0 million and $7.4$5.0 million, respectively. We have recently entered into lease agreements with third parties to lease new manufacturing facilities in China, Mexico and Turkey, and we expect to commence operations at these new facilities in the second half of 2016. We have also entered into a new lease with a third party for a third manufacturing facility in Juárez, Mexico, and we expect to commence operations at this facility in the first half of 2017.Turkey. Major projects expected to be undertaken include purchasing equipment for and the expansion of our Dafeng, China; MexicoChina and TurkeyTaicang China facilities and new facilities in Mexico and Turkey. Our ability to grow our business is predicated upon us making significant additional capital investments to expand our existing manufacturing facilities and build and operate new manufacturing facilities in existing and new markets. We generally estimate that the startup of a new six line manufacturing facility requires cash for net operating expenses and working capital of between $15 million to $25 million and additional capital expenditures for machinery and equipment of between $15 million to $25 million. In addition, we estimate our annual maintenance capital expenditures to be $500,000between $1.5 million to $1$2.0 million per facility. We may not have the capital to undertake these capital investments. In addition, our capital expenditures may be significantly higher if our estimates of future capital investments are incorrect and may increase substantially if we are required to undertake actions to comply with new regulatory requirements or compete with new

technologies. The cost of some projects may also be affected by foreign exchange rates if any raw materials or other goods must be paid for in foreign currency. We cannot assure you that we will be able to raise funds on favorable terms, if at all, or that future financings would not be dilutive to holders of our capital stock. We also cannot assure you that completed capital expenditures will yield the anticipated results. If we raise additional funds by obtaining loans from third parties, the terms of those financing arrangements may include negative covenants, or other restrictions on our business that could impair our operational flexibility, and would require us to fund additional interest expense. If we are unable to obtain sufficient capital at a reasonable cost or at all, we may not be able to expand production sufficiently to take advantage of changes in the marketplace or may be required to delay, reduce or eliminate some or all of our current operations, which could materially harm our business, operating results and financial condition.

As a U.S. corporation with international operations, we are subject to the U.S. Foreign Corrupt Practices Act of 1977, which could impact our ability to compete in certain jurisdictions.

As a U.S. corporation, we and our subsidiaries are subject to the U.S. Foreign Corrupt Practices Act or FCPA,of 1977 (FCPA), which generally prohibits U.S. companies and their intermediaries from making improper payments to foreign officials for the purpose of obtaining or keeping business. We have manufacturing facilities in China, Mexico and Turkey, countries with a fairly high risk of corruption. Those facilities are subject to routine government oversight. In addition, a small number of our raw materials and components suppliers are state-owned in China. Moreover, due to our need to import raw materials across international borders, we also routinely have interactions, directly or indirectly, with customs officials. In many foreign countries, under local custom, businesses engage in practices that may be prohibited by the FCPA or other similar laws and regulations. Additionally, we continue to hire employees around the world as we continue to expand. Although we have recently implemented certain procedures designed to ensure compliance with the FCPA and similar laws, there can be no guarantee that all of our employees and agents, as well as those companies to which we outsource certain of our business operations, have not taken and will not take actions that violate our policies and the FCPA, which could subject us to fines, penalties, disgorgement, and loss of business, harm our reputation and impact our ability to compete in certain jurisdictions. In addition, these laws are complex and far-reaching in nature, and, as a result, we may be required in the future to alter one or more of our practices to be in compliance

with these laws or any changes in these laws or the interpretation thereof. Moreover, our competitors may not be subject to the FCPA or comparable legislation, which could provide them with a competitive advantage in some jurisdictions.

We may have difficulty making distributions and repatriating earnings from our Chinese manufacturing operations, which may also occur in some of our other locations.

A material portion of our business is conducted in China. As of March 31, 2016,2017, our China operations had unrestricted cash of $7.9$14.8 million, most of which iswill be used to fund our future operations in China. Our ability to repatriate funds from China to the United States is subject to a number of restrictions imposed by the Chinese government. We repatriate funds through a Technology License Contract, a Services AgreementContracts and dividends. Under the Technology License Contract, TPI Composites (Taicang) Co, Ltd., or TPI Taicang, is required to pay TPI Technology, Inc., our wholly-owned subsidiary, 4.9% of its net sales for the use of an exclusive and non-transferable license to use Technical Information, as defined in the Technology License Contract, to produce products at its facilities. Under the Services Agreement, we provide (i) accounting and financial advisory services, (ii) environmental and EHS programs, (iii) information technology and data services, (iv) global sourcing and procurement services and (v) engineering and development services to TPI Taicang.corporate/administrative Service Agreements. We are compensated quarterly based on agreed upon hourlyroyalty rates for such intellectual property licenses and quarterly fees for those services. Certain of our subsidiaries are limited in their ability to declare dividends without first meeting statutory restrictions of the People’s Republic of China, including retained earnings as determined under Chinese-statutory accounting requirements. Additionally, under the terms of our credit agreement with one of our Chinese lenders, we are required to obtain its approval to pay dividends and have a current ratio of not less than one. Until 50% ($5.2 million) of registered capital is contributed to a surplus reserve, our Chinese operations can only pay dividends equal to 90% of after-tax profits (10% must be contributed to the surplus reserve). Once the surplus reserve fund requirement is met, we can pay dividends equal to 100% of after-tax profit assuming other conditions are met. AtAs of December 31, 2015,2016, the amount of the surplus reserve fund was $2.9$4.4 million. Any inability to make distributions, repatriate earnings or otherwise access funds from our manufacturing operations in China, if and when needed for use outside of China, could materially harm our liquidity and our business.

Effective internal controls are necessary for us to provide reliable financial reports and effectively prevent fraud.address fraud risks.

We maintain a system of internal controls to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP. The process of designing and implementing effective internal controls is a continuous effort that requires us to anticipate and react to changes in our business and the economic and regulatory environments and to expend significant resources to establish and maintain a system of internal controls that will be adequate to satisfy the reporting obligations of a public company. The effectiveness of our internal controls depends in part on the cooperation of senior managers worldwide. See “Risks“Risk Factors—Risks Related to Our Wind Blade Business—In mid-2015, our Audit Committee conducted an internal investigation into allegations of improper business dealings in China. While the investigation did not substantiate the allegations, we ultimately terminated our former Senior Vice President—Asia, then serving as a consultant to the Company, in January 2016 for material violations of his agreements with us and with Company policies that came to light subsequent to the completion of the internal investigation. Any misconduct that the investigation or our subsequent review of the activities of our former Senior Vice President—Asia failed to uncover could have a material adverse effect on our operations generally.”

Any system of controls, however well designed and operated, can provide only reasonable, and not absolute, assurance that the objectives of the system are met. Any failure to maintain that system, or consequent inability to produce accurate financial statements on a timely basis, could increase our operating costs and harm our business, and lead to our becoming subject to litigation, sanctions or investigations by The NASDAQ Global Market (NASDAQ), the SEC or other regulatory governmental agencies and bodies. Furthermore, investors’ perceptions that our internal controls are inadequate or that we are unable to produce accurate financial statements on a timely basis may harm our stock price.

We have in the past experienced material weaknesses. While we have successfully remediated those material weaknesses, we could experience control deficiencies in the future or identify areas requiring improvement in our internal control over financial reporting.

The state of financial markets and the economy may materially harm our sources of liquidity and capital.

There has been significant recent turmoil and volatility in worldwide financial markets. These conditions have resulted in a disruption in the liquidity of financial markets, and could directly impact us to the extent we need to access capital markets to raise funds to support our business and overall liquidity position. This situation could affect the cost of such funds or our ability to raise such funds. If we were unable to access any of these funding sources when needed, it could materially harm our business, operating results and financial condition.

Our ability to use our net operating loss carry forwards may be subject to limitation and may result in increased future tax liability.

Sections 382 and 383 of the Internal Revenue Code of 1986, as amended or the Code,(the Code), contain rules that limit the ability of a company that undergoes an “ownership change” to utilize its net operating loss (NOL) and tax credit carry forwards and certain built-in losses recognized in years after the ownership change. An “ownership change” is generally defined as any change in ownership of more than 50% of a corporation’s stock over a rolling three-year period by stockholders that own (directly or indirectly) 5% or more of the stock of a corporation, or arising from a new issuance of stock by a corporation. If an ownership change occurs, Section 382 generally imposes an annual limitation on the use of pre-ownership change net operating losses, or NOLs, credits and certain other tax attributes to offset taxable income earned after the ownership change. The annual limitation is equal to the product of the applicable long-term tax exempt rate and the value of the company’s stock immediately before the ownership change. This annual limitation may be adjusted to reflect any unused annual limitation for prior

years and certain recognized built-in gains and losses for the year. In addition, Section 383 generally limits the amount of tax liability in any post-ownership change year that can be reduced by pre-ownership change tax credit carryforwards. This could result in increased U.S. federal income tax liability for us if we generate taxable income in a future period. Limitations on the use of NOLs and other tax attributes could also increase our state tax liability. The use of our tax attributes will also be limited to the extent that we do not generate positive taxable income in future tax periods. As a result of these limitations, we may be unable to offset future taxable income (if any) with losses, or our tax liability with credits, before such losses and credits expire. Accordingly, these limitations may increase our federal income tax liability.

Although we dohave not expect to incurexperienced an ownership change as a result of the transactions described in this offering,since 2008, it is possible that the transactions described in this offering, when combined with past and future transactions willmay cause us to undergo one or more ownership changes. As of December 31, 2015,2016, we have U.S. federal NOLs of approximately $78.1$57.5 million, state NOLs of approximately $61.1$77.2 million, foreign NOLstax credits of approximately $3.2$2.6 million and foreignTurkey investment tax credits of approximately $0.3 million available to offset future taxable income. At the end ofIn 2008, we had an “ownership change” and the pre-ownership change NOLs existing at the date of change of $25.6 million arewere subject to an annual limitation of $4.3 million. As of December 31, 2015,2016, the remaining pre-ownership change net operating losses of approximately $20.5 millionNOLs are no longer limited. Certain of these NOLs may be at risk of limitation in the event of a future ownership change.

We have U.S. federal U.S.and state and foreign NOLs. In general, NOLs in one country cannot be used to offset income in any other country and NOLs in one state cannot be used to offset income in any other state. Accordingly, we may be subject to tax in certain jurisdictions even if we have unused NOLs in other jurisdictions. Also, each jurisdiction in which we operate may have its own limitations on our ability to utilize NOLs or tax credit carryovers generated in that jurisdiction. These limitations may increase our federal, state, and/or foreign income tax liability.

Our current credit facility with Highbridge Principal StrategiesHPS Investment Partners, LLC and Capital One, N.A. contains, and any future loan agreements we may enter into may contain, operating and financial covenants that may restrict our business and financing activities.

We have a $100.0 million amended and restated credit facility or the(the Restated Credit Facility,Facility) with Highbridge Principal Strategies,HPS Investment Partners, LLC or Highbridge, $74.4and Capital One, N.A., consisting of a $75.0 million term loan and a $25.0 million revolving credit facility, which includes a $15.0 million letter of which was outstanding ascredit sub-facility (increased to $20.0 million in April 2017). As of March 31, 2016.2017, the aggregate outstanding balance under the Restated Credit Facility was $76.9 million. The Restated Credit Facility is secured by substantially all of our assets. In addition, from time to time, we enter into various loan, working capital and accounts receivable financing facilities to finance the construction and ongoing operations of our advanced manufacturing facilities and other capital expenditures. The Restated Credit Facility contains various financial covenants and restrictions on our and our operating subsidiaries’ excess cash flows and ability to make capital expenditures, incur additional indebtedness and pay dividends or make distributions on, or repurchase, our stock. The operating and financial restrictions and covenants of the Restated Credit Facility, as well as our other existing and any future financing agreements that we may enter into, may restrict our ability to finance our operations, engage in business activities or expand or fully pursue our business strategies. Our ability to comply with these covenants may be affected by events beyond our control, and we may not be able to maintain appropriate minimum EBITDA (as defined in the Credit Facility), leverage ratio and fixed charge coverage ratio requirements in the future. A breach of any of these covenants could result in a default under the applicable loan facility, which could cause all of the outstanding indebtedness under such facility to become immediately due and payable by us and/or enable the lender to terminate all commitments to extend further credit. In addition, if we were unable to repay the outstanding indebtedness upon a default, the lenderour lenders could proceed against the assets pledged as collateral to secure that indebtedness.

Our indebtedness may adversely affect our business, results of operations and financial condition.

Our substantial indebtedness could adversely affect our business, results of operations and financial condition by, among other things:

In addition, we may not be able to generate sufficient cash flow from our operations to repay our outstanding indebtedness when it becomes due and to meet our other cash needs or to comply with the financial covenants set forth therein. If we are not able to pay our debts as they become due, we could be in default under our loan agreement with Highbridgeof the Restated Credit Facility or other indebtedness. We might also be required to pursue one or more

alternative strategies to repay indebtedness, such as selling assets, refinancing or restructuring our indebtedness or selling additional debt or equity securities. We may not be able to refinance our debt or sell additional debt or equity securities or our assets on favorable terms, if at all, and if we must sell assets, it may negatively affect our ability to generate revenues.

Much of our intellectual property consists of trade secrets and know-how that is very difficult to protect. If we experience loss of protection for our trade secrets or know-how, our business would be substantially harmed.

We have a variety of intellectual property rights, including patents, trademarks and copyrights, but much of our most important intellectual property rights consists of trade secrets and know-how and effective intellectual property protection may be unavailable, limited or outside the scope of the intellectual property rights we pursue in the United States and in foreign countries such as China where we operate. Although we strive to protect our intellectual property rights, there is always a risk that our trade secrets or know-how will be compromised or that a competitor could lawfully reverse-engineer our technology or independently develop similar or more efficient technology. We have confidentiality agreements with each of our customers, suppliers, key employees and independent contractors in place to protect our intellectual property rights, but it is possible that a customer, supplier, employee or contractor might breach the agreement, intentionally or unintentionally. For example, we believe a key former employee may have shared some of our intellectual property with a competitor in China and this former employee or the competitor may use this intellectual property to compete with us in the future. It is also possible that our confidentiality agreements with customers, suppliers, employees and contractors will not be effective in preserving the confidential nature of our intellectual property rights. The patents we own could be challenged, invalidated, narrowed or circumvented by others and may not be of

sufficient scope or strength to provide us with any meaningful protection or commercial advantage. Once our patents expire, or if they are invalidated, narrowed or circumvented, our competitors may be able to utilize the inventions protected by our patents. Additionally, the existence of our intellectual property rights does not guarantee that we will be successful in any attempt to enforce these rights against third parties in the event of infringement, misappropriation or other misuse, which may materially and adversely affect our business. Because our ability to effectively compete in our industry depends upon our ability to protect our proprietary technology, we might lose business to competitors and our business, revenue, operating results and prospects could be materially harmed if we suffer loss of trade secret and know-how protection or breach of our confidentiality agreements.

If the transfer pricing arrangements we have among our subsidiaries are determined to be inappropriate in one or more jurisdictions, our tax liability may increase.

In many countries, including the United States, we are subject to transfer pricing and other tax regulations designed to ensure that appropriate levels of income are reported as earned in each jurisdiction in which we operate. These regulations require that any international transaction involving associated enterprises be on substantially the same basis as a transaction between unrelated companies dealing at arms’ length and that contemporaneous documentation be maintained to support the transfer prices. We have transfer pricing arrangements among our subsidiaries in relation to various aspects of our business. We consider the transactions among our subsidiaries to be substantially on arm’s-length terms. If, however, a tax authority in any jurisdiction reviews any of our tax returns and determines that the transfer prices and terms we have applied are not appropriate, or that other income of our affiliates should be taxed in that jurisdiction, we may incur increased tax liability, including accrued interest and penalties, which would cause our tax provision to increase, possibly materially. In addition, if the countryjurisdiction from which the income is reallocated does not agree with the reallocation, both countriesjurisdictions could tax the same income, resulting in double taxation. If tax authorities were to allocate income to a higher tax jurisdiction, subject our income to double taxation, or assess interest and penalties, it would increase our consolidated tax liability, which could materially harm our business, operating results and financial condition.

Our insurance coverage may not cover all risks we face and insurance premiums may increase, which may hinder our ability to maintain sufficient coverage to cover losses we may incur.

We are exposed to risks inherent in the manufacturing of wind blades and other composite structures as well as the construction of our facilities, such as natural disasters, breakdowns and manufacturing defects that could harm persons and damage property. We maintain insurance coverage with licensed insurance carriers that limits our aggregate exposure to certain types of catastrophic losses. In addition, we self-insure for a portion of our claims exposure resulting from workers’ compensation and certain events of general liability. We accrue currently for estimated incurred losses and expenses, and periodically evaluate and adjust our claims accrued liability amount to reflect our experience. However, our insurance coverage may not be sufficient to cover the full amount of potential losses. In addition, there are some types of losses such as from warranty, hurricanes, terrorism, wars, or earthquakes where insurance is limited and/or not economically justifiable. If we were to sustain a serious uninsured loss or a loss exceeding the limits of our insurance policies, the resulting costs could have a material adverse effect on our business prospects, results of operations and financial condition. Further, our insurance policies provide for our premiums to be adjusted annually. If the premiums we pay for our policies increase significantly, we may be unable to maintain the same level of coverage we currently carry, or we will incur significantly greater costs to maintain the same level of coverage, including through higher deductibles.

We may be subject to significant liabilities and costs relating to environmental and health and safety requirements.

We are subject to various environmental, health and safety laws, regulations and permit requirements in the jurisdictions in which we operate governing, among other things, health, safety, pollution and protection of

the environment and natural resources, the handling and use of hazardous substances, the generation, storage, treatment and disposal of wastes, and the cleanup of any contaminated sites. We have incurred, and expect to continue to incur, capital and operating expenditures to comply with such laws, regulations and permit requirements. While we believe that we currently are in material compliance with all such laws, regulations and permit requirements, any noncompliance may subject us to a range of enforcement measures, including the imposition of monetary fines and penalties, other civil or criminal sanctions, remedial obligations, and the issuance of compliance requirements restricting our operations. In addition, the future adoption of more stringent laws, regulations and permit requirements may require us to make additional capital and operating expenditures. Under certain environmental laws and regulations, liabilities also can be imposed for cleanup of currently and formerly owned, leased or operated properties, or properties to which we sent hazardous substances or wastes, regardless of whether we directly caused the contamination or violated any law. For example, we could have future liability relating to any contamination that remains from historic industrial operations by others at our properties. Additionally, some of our facilities have a long history of industrial operations and, in the past, contaminants have been detected and remediated at our Turkey facility.

There can be no assurance that we will not in the future become subject to compliance requirements, obligations to undertake cleanup or related activities, or claims or proceedings relating to environmental, health or safety matters, hazardous substances or wastes, contaminated sites, or other environmental or natural resource damages, that could impose significant liabilities and costs on us and materially harm our business, operating results or financial condition.

Claims that we infringe, misappropriate or otherwise misuse the intellectual property rights of others could subject us to significant liability and disrupt our business.

Our competitors and third party suppliers of components and raw materials used in our products protect their intellectual property rights by means such as trade secrets and patents. In the future we may be sued for violations of other parties’ intellectual property rights, and the risk of this type of lawsuit will likely increase as our size, geographic presence and market share expand and as the number of competitors in our market increases. Any such claims or litigation, whether meritorious or not, could:

Any of the foregoing could disrupt our business and materially harm our operating results and financial condition. In addition, intellectual property disputes have in the past arisen between our customers which negatively affected such customers’ demand for wind blades manufactured by us. If such intellectual property disputes involving, or between, one or more of our customers should arise in the future, our business could be materially harmed.

We may form joint ventures, or acquire businesses or assets, in the future, and we may not realize the benefits of those transactions.

We have, in the past, entered into joint ventures with third parties for the manufacture of wind blades. For example, we entered into joint ventures with third parties in both our Mexico and Turkey locations. We may create new or additional joint ventures with third parties, or acquire businesses or assets, in the future that we believe will complement or augment our existing business. We cannot assure you that, following any such joint venture or acquisition, we will achieve the expected synergies to justify the transaction. We may encounter numerous difficulties in manufacturing any new products resulting from a joint venture or acquisition that delay or prevent us from realizing their expected benefits or enhancing our business. If we enter into joint ventures or acquire businesses or assets with respect to promising markets, we may not be able to realize the benefit of those joint ventures or acquired businesses assets if we are unable to successfully integrate them with our existing operations and company culture.

Work disruptions resulting from our collective bargaining agreements could result in increased operating costs and materially harm our business, operating results and financial condition.

OurCertain of our employees in Turkey, which represented approximately 24%15% of our workforce as of June 30, 2016,March 31, 2017, are covered by collective bargaining arrangements, which expired on December 31, 2015. In May 2016, we entered into in May 2016 and have a new three-year collective bargainingterm. This agreement with our Turkish employees. We expect that the new agreement will resultresulted in an average increase in pay of approximately 20% for employees covered by the agreement. In addition, beginning on July 1, 2017, these collective bargaining arrangements will also cover similarly situated employees at our second Turkey facility, which represented approximately 7% of our workforce as of March 31, 2017, at which we recently commenced production. Additionally, our other employees working at other manufacturing facilities may vote to be represented by a labor union in the future. For example, our employees in Iowa attempted unsuccessfully to unionize in December 2013. There can be no assurance that we will not experience labor disruptions such as work stoppages or other slowdowns by workers at any of our facilities. Should significant industrial action, threats of strikes or related disturbances occur, we could experience a disruption of operations and increased labor costs in Turkey or other locations, which could materially harm our business, operating results or financial condition. Any such work stoppage or slow-down at any of our facilities could also result in additional expenses and possible loss of revenue for us.

Our information technology infrastructure could experience serious failures or disruptions, the failure of which could materially harm our business, operating results and financial condition.

Information technology is part of our business strategy and operations. It enables us to streamline operation processes, facilitating the collection and reporting of business data, in addition to internal and external communications. There are risks that information technology system failures, network disruptions and breaches of data security could disrupt our operations. Any significant disruption or breach may materially harm our business, operating results or financial condition.

We will incur significant increased costs as a result of operating as a public company, and our management will be required to devote substantial time to compliance initiatives.

As a public company, we will incur significant legal, accounting and other expenses that we did not incur as a private company. In addition, the Sarbanes-Oxley Act, as well as rules subsequently implemented by the SEC and The NASDAQ, Global Market, impose various requirements on public companies, including requiring establishment and maintenance of effective disclosure controls and internal control over financial reporting and changes in corporate governance practices. Our management and other personnel will need to devote a substantial amount of time to these compliance initiatives. Moreover, these rules and regulations will increase our legal and financial compliance costs and will make some activities more time-consuming and costly. For example, we expect these

rules and regulations to make it more difficult and more expensive for us to obtain director and officer liability insurance. We estimate that we will incur approximately $2.5 million to $3.0 million in expenses annually in response to these requirements.

Section 404(a) of the Sarbanes-Oxley Act requires annual management assessments of the effectiveness of our internal control over financial reporting, starting with the second annual report that we file with the SEC. However, as long as we remain an “emerging growth company,” as defined in the JOBS Act, we intend to take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not “emergingemerging growth companies”companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404(b) of the Sarbanes-Oxley Act. We will take advantage of these reporting exemptions until we are no longer an “emergingemerging growth company” and will incur additional expense and time related to these efforts at that time. We will remain an “emergingemerging growth company”company until the earliest of (i) the last day of the fiscal year in which we have total annual gross revenues of $1.0 billion or more; (ii) the last day of our fiscal year following the fifth anniversary of the date of the completion of this offering;our IPO; (iii) the date on which we have issued more than $1.0 billion in nonconvertible debt during the previous three years; or (iv) the date on which we are deemed to be a large“large accelerated filerfiler” under SEC rules.

Our testing, or the subsequent testing by our independent registered public accounting firm, may reveal deficiencies in our internal control over financial reporting that are deemed to be material weaknesses. Our management and other personnel will need to devote a substantial amount of time to these compliance initiatives, diverting their attention away from the day-to-day management of our business, and we may not successfully or efficiently manage our transition into a public company. We will also need to upgrade our systems, implement additional financial and management controls, reporting systems and procedures, hire an internal audit group and additional accounting, auditing and financial staff with appropriate public company experience and technical accounting knowledge. We have significant operations in China, Mexico and Turkey and may have difficulty hiring and retaining employees in these countries who have the experience necessary to implement the kind of management and financial controls that are expected of a U.S. public company. In this regard, for example, China has only recently begun to adopt management and financial reporting concepts and practices like those in the United States. If we are not able to comply with these requirements in a timely manner or if we or our independent registered public accounting firm identify deficiencies in our internal control over financial reporting that are deemed to be material weaknesses, the market price of our stock could decline, and we could be subject to sanctions or investigations by The NASDAQ, Global Market, the SEC or other regulatory authorities, which would require additional financial and management resources.

We are faced with increasingly complex tax issues in many jurisdictions, and we could be obligated to pay additional taxes in various jurisdictions.

We may be subject to taxation in many jurisdictions in the United States and around the world with increasingly complex tax laws, the application of which can be uncertain. The amount of taxes we pay in these jurisdictions could increase substantially as a result of changes in the applicable tax laws, including increased tax rates or revised interpretations of existing tax laws and precedents, which could harm our liquidity and operating results. In addition, the taxing authorities in these jurisdictions could review our tax returns, or authorities in jurisdictions in which we do not file tax returns could assert that we are subject to tax in those jurisdictions, and in either case could impose additional tax, interest and penalties. Further, the authorities could claim that various withholding requirements apply to us or our subsidiaries or assert that benefits of tax treaties are not available to us or our subsidiaries, any of which could have a material adverse impact on us and the results of our operations.

The current U.S. presidential administration has made public statements indicating that it has made international tax reform a priority, and key members of the U.S. Congress have conducted hearings and proposed a wide variety of potential changes. Certain changes to U.S. tax laws, including border adjustable tax provisions as well as limitations on the ability to defer U.S. taxation on earnings outside of the United States until those earnings are repatriated to the United States, could affect the tax treatment of our foreign earnings, as well as cash and cash equivalent balances we currently maintain outside of the United States.

Risks Related to thisThis Offering and Ownership of Our Common Stock

There has been no public market for our common stock, and an active, liquid trading market may not develop.

Before this offering, there was no public market for shares of our common stock. An active and liquid trading market may not develop following this offering or, if developed, may not be sustained. The lack of an active and liquid market may impair your ability to sell your shares of common stock at the time you wish to sell them or at a price that you consider reasonable. The lack of an active and liquid market may also reduce the market value and increase the volatility of your shares of common stock. In addition, an inactive and illiquid market may impair our ability to raise capital by selling shares of common stock and may impair our ability to acquire other business or assets by using shares of our common stock as consideration.

The price of our common stock may fluctuate substantially and your investment may decline in value.

The initial public offering price for the shares of our common stock to be sold in this offering was determined by negotiation between the representatives of the underwriters and us based upon a number of factors, including the history of, and the prospects for, our company and our industry, and may not be indicative of prices that will prevail following this offering. In addition, the market price of our common stock is likely to be highly volatile and may fluctuate substantially due to many factors, including:

In addition, the stock market in general, and Theincluding NASDAQ, Global Market, as well as the market for broader energy and renewable energy companies in particular, have experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of particular companies affected. These broad market and industry factors may materially harm the market price of our common stock, regardless of our operating performance. In the past, securities class-action litigation has often been instituted against a company following periods of volatility in the market price of that company’s securities. Securities class-action litigation, if instituted against us, could result in substantial costs or damages and a diversion of management’s attention and resources, which could materially harm our business and operating results.

A significant portion of our total outstanding shares may be sold into the public market in future sales, which could cause the market price of our common stock to drop significantly, even if our business is doing well.

Sales of a substantial number of shares of our common stock in the public market could occur at any time after the expiration of the lock-up agreements described in the section entitled “Underwriting.” These sales, or the market perception that the holders of a large number of shares intend to sell shares, could reduce the

market price of our common stock. After the closeAs of this offering,March 31, 2017, we will have 32,781,263had 33,736,863 shares of common stock outstanding, assuming the underwriters do not exercise their option to purchase additional shares. This includes the 7,250,000outstanding. All shares that we are selling in this offering, which may be resold in the public market immediately. The remaining 25,531,263 shares will be able tocan now be sold, subject to any applicable volume limitations under federal securities laws, upon expiration of the lock-up agreements with the underwriters of this offering.laws.

In addition, as of March 31, 2016,2017 there are 61,720were: (i) 160,424 shares subject to outstanding Common Warrants,common stock warrants, or 0.2%approximately 0.5% of our outstanding shares after this offering, 3,348,628shares; (ii) 3,309,818 shares subject to outstanding options, or 10.2%approximately 9.8% of our outstanding shares after this offering, 654,120shares; (iii) 636,120 restricted stock units, or 2.0%approximately 1.9% of our outstanding shares; and (iv) 4,958,767 shares after this offering and 3,382,936 shares,reserved for future issuance, or 10.3%approximately 14.7% of our outstanding shares after this offering, reserved for future issuance under the 2015 Plan that will become eligible for sale in the public market to the extent permitted by any applicable vesting requirements the lock-up agreements and Rules 144 and 701 under the Securities Act. Moreover, after this offering, holders of an aggregate of approximately 25,008,03827,247,725 shares of our common stock, will have rights, subject to some conditions, to require us to file registration statements covering their shares or to include their shares in registration statements that we may file for ourselves or other stockholders. We also intend to registerhave registered all shares of common stock that we may issue under our employee equity incentive plans. Once we register theseThese shares they can be freely sold in the public market upon issuance and subject to the lock-up agreements and the restrictions imposed on our affiliates under Rule 144.

In the future, we may also issue our securities in connection with investments or acquisitions. The amount of shares of our common stock issued in connection with an investment or acquisition could constitute a material portion of our then-outstanding shares of our common stock. Any issuance of additional securities in connection with investments or acquisitions may result in additional dilution to you and may cause the market price of our common stock to drop significantly.

None of the proceeds from the sale of shares of common stock by the selling stockholders in this offering will be available to fund our operations.

We will not receive any proceeds from the sale of shares of our common stock by the selling stockholders in this offering. The selling stockholders, which include certain of our executive officers, will receive all proceeds from the sale of shares. Consequently, none of the proceeds from such sale will be available to fund our operations, capital expenditures or acquisition opportunities. See “Use of Proceeds” and “Principal and Selling Stockholders.”

The exercise of options and warrants and other issuances of shares of common stock or securities convertible into common stock under our equity compensation plans will dilute your interest.

Under our existing equity compensation plans, as of March 31, 2016,2017, we havehad outstanding options to purchase 3,348,6283,309,818 shares of our common stock and 654,120636,120 restricted stock units to our employees and non-employee directors. From time to time, we expect to grant additional options and other stock awards in accordance with the 2015 Plan. The exercise of options and warrants at prices below the market price of our common stock could adversely affect the price of shares of our common stock. Additionally, any issuance of our common stock that is not made solely to then-existing stockholders proportionate to their interests, such as in the case of a stock dividend or stock split, will result in dilution to each stockholder by reducing their percentage ownership of the total outstanding shares. If we issue options or warrants to purchase our common stock in the future and those options or warrants are exercised or we issue stock, stockholders may experience further dilution. In addition, as of March 31, 2017, there were 160,424 shares of our common stock subject to outstanding common stock warrants which could result in further dilution to the stockholders.

Our executive officers, directors and their affiliated entities will continue to have substantial control over us and could limit the ability of other stockholders to influence the outcome of key transactions, including changes of control.

Our executive officers, directors and their affiliated entities, will, in the aggregate, beneficially own approximately 77%74% of the outstanding common stock, or approximately 60% after this offering, excluding any exercise by the underwriters of their option to purchase additional shares, based on 32,781,26333,736,863 shares of common stock outstanding after this offering.as of March 31, 2017. Our executive officers, directors and their affiliated entities, if acting

together, will be able to control or significantly influence all matters requiring approval by our stockholders, including the election of directors and the approval of mergers or other significant corporate transactions. In addition, certain of our stockholders are affiliated with certain of our customers. These stockholders might have interests that differ from yours, and they might vote in a way with which you disagree and that could be adverse to your interests. The concentration of common stock ownership could have the effect of delaying, preventing, or deterring a change of control of our company, could deprive our stockholders of an opportunity to receive a premium for their common stock as part of a sale of our company, and could negatively affect the market price of the common stock.

As a new investor, you will experience immediate and substantial dilution in net tangible book value of your shares of common stock.

If you purchase common stock in this offering, you will pay more for your shares than the amounts paid by existing stockholders for their shares. As a result, you will experience immediate and substantial dilution of approximately $12.66 per share, representing the difference between the initial public offering price for our shares in this offering and our pro forma net tangible book value per share after giving effect to this offering at an assumed public offering price of $16.00, the mid-point of the range on the cover page of this prospectus. If the holders of outstanding options to purchase our common stock exercise these options in the future pursuant to our current or future stock option plans, you will incur further dilution. If we raise additional equity by issuing equity securities or convertible debt, or if we acquire other companies or technologies by issuing equity, the newly issued shares will further dilute your percentage ownership and may reduce the value of your investment.

If equity research analysts do not publish research or reports about our business or if they issue unfavorable commentary or downgrade our common stock, the price of our common stock could decline.

The trading market for our common stock will relyrelies in part on the research and reports that equity research analysts publish about us and our business. We do not control the work performed by these analysts. If

no securities or industry analysts commence coverage of our company, the trading price of our common stock would suffer. In the event we obtain securities or industry analyst coverage,The demand for our common stock could decline if one or more equity analysts downgrade our stock or if those analysts issue unfavorable or inaccurate commentary. If such analysts cease publishing reports about us or our business, we could lose visibility in the market, which in turn could cause our share price and trading volume to decline.

We do not currently intend to pay dividends on the common stock, which may hinder your ability to achieve a return on your investment.

We have never declared or paid any cash dividends on our common stock. The continued operation and expansion of our business will require substantial funding and thus we currently intend to retain any future earnings and do not expect to pay any dividends in the foreseeable future. Accordingly, you are not likely to receive any dividends on common stock in the foreseeable future, and your ability to achieve a return on your investment will therefore depend on appreciation in the price of the common stock.

Our management will have broad discretion over the use of the proceeds we receive in this offering and might not apply the proceeds in ways that increase the value of your investment.

Currently, we anticipate using the net proceeds to us from this offering for general corporate purposes, including funding the costs of our corporate, operating and expansion activities. Accordingly, our management will have broad discretion over the use of our net proceeds of this offering. You will be relying on their judgment regarding the application of those net proceeds. While our management intends to use our net proceeds in a manner that is in the best interests of our company and our stockholders, they might not apply the net proceeds in ways that increase the value of your investment. The market price of the common stock could fall if the market does not view our use of our net proceeds favorably.

Provisions of Delaware law or our charter documents could delay or prevent an acquisition of our company, even if the acquisition would be beneficial to our stockholders, and could make it more difficult for you to change management.

Provisions of Delaware law and our amended and restated certificate of incorporation and amended and restated by-laws which will be effective upon the completion of this offering, may discourage, delay or prevent a merger, acquisition or other change in control that stockholders may consider favorable, including transactions in which stockholders might otherwise receive a premium for their shares. These provisions may also prevent or delay attempts by stockholders to replace or remove our current management or members of our board of directors. These provisions include:

The affirmative vote of the holders of at least 75% of our shares of capital stock entitled to vote, and not less than 75% of the outstanding shares of each class entitled to vote thereon as a class, is necessary to amend or repeal the above provisions that are contained in our amended and restated certificate of incorporation. In

addition, absent approval of our board of directors, our amended and restated by-laws may only be amended or repealed by the affirmative vote of the holders of at least 75% of our shares of capital stock entitled to vote.

In addition, upon the closing of this offering, we will beare subject to the provisions of Section 203 of the Delaware General Corporation Law, which limits business combination transactions with stockholders of 15% or more of our outstanding voting stock that our board of directors has not approved. These provisions and other similar provisions make it more difficult for stockholders or potential acquirers to acquire us without negotiation. These provisions may apply even if some stockholders may consider the transaction beneficial to them.

As a result, these provisions could limit the price that investors are willing to pay in the future for shares of our common stock. These provisions might also discourage a potential acquisition proposal or tender offer, even if the acquisition proposal or tender offer is at a premium over the then current market price for our common stock.

We are an “emerging growth company” and will be able to avail ourselves of reduced disclosure requirements applicable to emerging growth companies, which could make our common stock less attractive to investors.

We are an “emerging growth company,” as defined in the JOBS Act, and we intend to take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not “emergingemerging growth companies”companies including not being required to comply with the auditor attestation requirements of Section 404(b) of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. We cannot predict whether investors will find our common stock less attractive because we may rely on these exemptions. If they do, there may be a less active trading market for our common stock and our stock price may be more volatile. We may take advantage of these reporting exemptions until we are no longer an “emergingemerging growth company.” We will remain an “emergingemerging growth company”company until the earliest of (i) the last day of the fiscal year in which we have total annual gross revenues of $1.0 billion or more; (ii) the last day of our fiscal year following the fifth anniversary of the date of the completion of this offering;our IPO; (iii) the date on which we have issued more than $1.0 billion in nonconvertible debt during the previous three years; or (iv) the date on which we are deemed to be a large“large accelerated filerfiler” under the rules of the SEC.

Under the JOBS Act, emerging growth companies can also delay adopting new or revised accounting standards until such time as those standards apply to private companies. We have irrevocably elected not to avail ourselves of this exemption from new or revised accounting standards and, therefore, will bewe are subject to the same new or revised accounting standards as other public companies that are not emerging growth companies.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus contains forward-looking statements. All statements other than statements of historical facts contained in this prospectus, including statements regarding our future results of operations and financial position, business strategy and plans and objectives of management for future operations, are forward-looking statements. In many cases, you can identify forward-looking statements by terms such as “may,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these terms or other similar words. Forward-looking statements contained in this prospectus include, but are not limited to, statements about:

These forward-looking statements are only predictions. These statements relate to future events or our future financial performance and involve known and unknown risks, uncertainties and other important factors that may cause our actual results, levels of activity, performance or achievements to materially differ from any future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements. We have described in the “Risk Factors” section and elsewhere in this prospectus the principal risks and uncertainties that we believe could cause actual results to differ from these forward-looking statements. Because forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified, you should not rely on these forward-looking statements as guarantees of future events.

The forward-looking statements in this prospectus represent our views as of the date of this prospectus. We anticipate that subsequent events and developments will cause our views to change. However, while we may elect to update these forward-looking statements at some point in the future, we undertake no obligation to update any forward-looking statement to reflect events or developments after the date on which the statement is made or to reflect the occurrence of unanticipated events except to the extent required by applicable law. You should, therefore, not rely on these forward-looking statements as representing our views as of any date after the date of this prospectus. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures, or investments we may make.

USE OF PROCEEDS

We estimate that the net proceeds fromThe selling stockholders, which include certain of our saleexecutive officers, are selling shares of 7,250,000 shares ofour common stock in this offering, willincluding any shares that may be $102.9 million, assuming an initial public offering pricesold in connection with the exercise of $16.00 per share, which is the midpoint of the estimated offering price range set forth on the cover page of this prospectus, and after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us. If the underwriters’ option to purchase additional sharesshares. See “Principal and Selling Stockholders.” Accordingly, we will not receive any proceeds from us is exercised in full, we estimate that our net proceeds would be approximately $119.1 million, after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us.

A $1.00 increase or decrease in the assumed initial public offering price would increase or decrease the net proceeds to us from this offering by approximately $6.7 million, assuming the number of shares offered, as set forth on the cover page of this prospectus, remains the same and after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us. Similarly, each increase or decrease of one million in the numbersale of shares of our common stock offered by us would increase or decrease the net proceeds that we receive fromin this offering. We will bear all costs, fees and expenses in connection with this offering, by approximately $14.9 million, assumingwhich are estimated to be $850,000, except that the assumed initial public offering price remains the same and after deducting the estimatedselling stockholders will pay all underwriting discounts and commissions and estimated offering expenses payablediscounts. See “Description of Capital Stock—Registration Rights” and “Underwriting.”

MARKET PRICE OF COMMON STOCK

Our common stock has been listed on The NASDAQ Global Market under the symbol “TPIC” since July 22, 2016. Prior to that date, there was no public trading market for our common stock. The following table sets forth for the periods indicated the high and low intra-day per share sale prices for our common stock as reported on The NASDAQ Global Market:

On May 5, 2017, the last reported sale price of our common stock on The NASDAQ Global Market was $17.97 per share. As of March 31, 2017, we had 13 stockholders of record of our common stock. The actual number of stockholders is greater than this number of stockholders of record, and includes stockholders who are beneficial owners, but whose shares are held in street name by us.

We intend to use the net proceeds to us from this offering for working capitalbrokers, trusts and other general corporate purposes, including the financing of our existing manufacturing operations and the expansion in existing and new geographies as well as approximately $13.8 million to finance the repayment of certain indebtedness, as described below. However, these potential alternatives for the use of proceeds could change significantly depending upon the amount of cash generated by our operations, competitive and industry developments, market opportunities, the rate of growth, if any, of our business, and a variety of other factors. Although we currently have no agreements or commitments for any specific acquisitions, we may also use a portion of the net proceeds to us to expand our current business through strategic alliances or acquisitions of other businesses, products or technologies.

We intend to use the net proceeds from this offering to pay off approximately $10.0 million of indebtedness plus accrued interest of approximately $1.8 million issued pursuant to our outstanding Subordinated Convertible Promissory Notes. The Subordinated Convertible Promissory Notes bear interest at a rate of 12% per annum and will automatically mature and be due and payable on the earlier of the completion of any change of control or qualified initial public offering, or at the election of the holders of the notes at any time after the occurrence of an event of default. We have previously used the proceeds from this indebtedness for working capital purposes. We also intend to use the net proceeds from this offering to repay a $2.0 million advance from GE Wind. See “Certain Relationships and Related Party Transactions—GE Wind Customer Advance” for additional information.

Although we currently anticipate that we will use the net proceeds from this offering as described above, there may be circumstances where a reallocation of funds is necessary. The amounts and timing of our actual expenditures will depend upon numerous factors, including our sales and marketing efforts, demand for our products, our operating costs and the other factors described under “Risk Factors” in this prospectus. Accordingly, our management will have flexibility in applying the net proceeds from this offering. An investor will not have the opportunity to evaluate the economic, financial or other information on which we base our decisions on how to use the proceeds. Pending the application of our net proceeds, we intend to invest our net proceeds in U.S. government securities and other short-term, investment-grade, interest-bearing instruments.nominees.

DIVIDEND POLICY

We have never declared or paid any cash dividends on shares of our capital stock. We currently intend to retain earnings, if any, to finance the development and growth of our business and do not anticipate paying cash dividends on the common stock in the future. Any payment of any future dividends will be at the discretion of the board of directors, subject to compliance with certain covenants in our loan agreements, after taking into account various factors, including our financial condition, operating results, capital requirements, restrictions contained in any future financing instruments, growth plans and other factors the board deems relevant.

CAPITALIZATION

The following table describes our cash and cash equivalents, as well as our capitalization, as of March 31, 2016 on:

The pro forma as adjusted information set forth in the table below is illustrative only and will be adjusted based on the actual initial public offering price and other final terms of this offering.2017. You should read this table together with the consolidated financial statements and related notes included elsewhere in this prospectus, as well as the sections titled “Selected Consolidated Financial and Other Data” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” that are included elsewhere in this prospectus.

If the underwriters’ option to purchase additional shares from us were exercised in full, pro forma as adjusted cash and cash equivalents, paid-in capital, total shareholders’ equity (deficit) and shares issued and outstanding as of March 31, 2016 would be $141.4 million, $320.0 million, $126.9 million and 33,868,763 shares, respectively.

The pro forma and pro forma as adjusted columns in the table above excludeexcludes the following:

DILUTION

If you invest in our common stock in this offering, your ownership interest will be diluted to the extent of the difference between the initial public offering price per share of our common stock and the pro forma as adjusted net tangible book value per share of our common stock immediately after this offering. Net tangible book value dilution per share to new investors represents the difference between the amount per share paid by purchasers of shares of common stock in this offering and the pro forma as adjusted net tangible book value per share of common stock immediately after completion of this offering.

Net tangible book value per share is determined by dividing our total tangible assets less our total liabilities by the number of shares of common stock outstanding. Our historical net tangible book value as of March 31, 2016 was $(194.6) million, or $(45.92) per share. Our pro forma net tangible book value as of March 31, 2016 was $6.6 million, or $0.26 per share, based on the total number of shares of our common stock outstanding as of March 31, 2016, after giving effect to the automatic conversion of all outstanding shares of our convertible preferred stock as of March 31, 2016 into an aggregate of 21,110,204 shares of common stock and the conversion of our Series B warrants into an aggregate of 182,572 shares of common stock, which conversion will occur immediately prior to the completion of this offering.

After giving effect to the sale by us of 7,250,000 shares of common stock in this offering at the assumed initial public offering price of $16.00 per share, which is the midpoint of the estimated offering price range set forth on the cover page of this prospectus, and after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us, our pro forma as adjusted net tangible book value as of March 31, 2016 would have been $109.5 million, or $3.34 per share. This represents an immediate increase in pro forma net tangible book value of $3.08 per share to our existing stockholders and an immediate dilution in pro forma net tangible book value of $12.66 per share to investors purchasing shares of common stock in this offering at the assumed initial public offering price. The following table illustrates this dilution:

Each $1.00 increase or decrease in the assumed initial public offering price of $16.00 per share, which is the midpoint of the estimated offering price range set forth on the cover page of this prospectus, would increase or decrease, as applicable, our pro forma as adjusted net tangible book value per share by $0.21, and would increase or decrease, as applicable, dilution per share to new investors in this offering by $0.93, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us. An increase of 1.0 million shares in the number of shares offered by us would increase our pro forma as adjusted net tangible book value per share by $0.34, and would increase our dilution per share to new investors in this offering by $0.08, after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us. A decrease of 1.0 million shares in the number of shares offered by us would decrease our pro forma as adjusted net tangible book value per share by $0.36, and would decrease our dilution per share to new investors in this offering by $0.11, after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us. In addition, to the extent any outstanding options to purchase common stock are exercised, new investors would experience further dilution. If the underwriters exercise their option to purchase additional shares from us in full, the pro forma as adjusted net tangible book value per share of our common stock immediately after this offering would be $3.71 per share, and the dilution in pro forma net tangible book value per share to new investors in this offering would be $12.29 per share.

The following table presents, on a pro forma as adjusted basis as of March 31, 2016, after giving effect to the conversion of all outstanding shares of convertible preferred stock into common stock and the conversion of our Series B warrants immediately prior to the completion of this offering, the differences between the existing stockholders and the new investors purchasing shares of our common stock in this offering with respect to the number of shares purchased from us, the total consideration paid or to be paid to us, which includes net proceeds received from the issuance of common stock and convertible preferred stock, and the average price per share paid or to be paid to us at an assumed offering price of $16.00 per share, which is the midpoint of the estimated offering price range set forth on the cover page of this prospectus, before deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us: