The ticker ESIO once identified Electro Scientific Industries, Inc., a Portland based laser microfabrication equipment maker that traded on Nasdaq from 1983 until early 2019. The company no longer exists as a public issuer. MKS Instruments completed its all cash acquisition of ESI at a fixed price of $30 per share, and the Nasdaq delisted the shares the same day. The registrant then filed a termination of registration under Section 12(g), and no periodic report has appeared on the CIK since the deal closed in early 2019.
This report documents the finding that the ESIO ticker is defunct, following the verification path the pipeline requires. The SEC company tickers file carries no entry for ESIO, and the exchange tickers file is equally silent. The EDGAR browse page for CIK 0000726514 shows a filing history that ends with the merger. The last substantive periodic filings were a quarterly report for the quarter that closed in late December 2018, and an annual report for the fiscal year that closed in March of the same year. The gap between that last quarterly report and the present exceeds seven years, far beyond the twelve month threshold in the dispatch brief. The absence of any new filing activity confirms the terminal status of the registrant, and the note report format that follows is the appropriate output.
Electro Scientific Industries was the oldest high technology company in Oregon. Founded in 1944 as Brown Engineering, the firm evolved through a series of name changes into Electro Scientific Industries, Inc. by 1960, and listed on Nasdaq in 1983 under the ESIO symbol. The business sat at the intersection of laser physics and microelectronics manufacturing: the company built application specific laser systems for drilling, scribing, dicing, trimming, marking, and inspection at the micron scale. Its products served flexible and rigid printed circuit boards, semiconductor wafers and packages, multilayer ceramic capacitors, and a broader set of industrial applications in automotive, aerospace, medical, and display end markets. The company employed roughly 650 people at the end of the final fiscal year, and operated production facilities in Singapore, Portland, and Klamath Falls, Oregon.
The strategic story of ESI in its final years was one of a specialty equipment maker riding a structural shift in consumer electronics. Flexible circuit content in high end consumer devices rose sharply through 2017 and 2018, and ESI held a leading position in laser via drilling for flex circuits. The company reorganized from a two segment structure into a single segment reporting model in the fourth quarter of 2017, closed facilities in Montreal, Napa, and Sunnyvale, and cut headcount under a restructuring plan that aimed to refocus resources on the most promising revenue opportunities. The repositioning worked on the income statement. Fiscal 2018 revenues more than doubled, and the company swung from a loss to a strong profit. It also made ESI an attractive target for a larger photonics and vacuum equipment platform.
MKS Instruments, a Massachusetts based maker of photonics and vacuum technology, announced a definitive agreement to acquire ESI in late October 2018. The deal was an all cash transaction at $30 per share, an enterprise value near $1 billion. The strategic logic for MKS was straightforward: ESI brought a portfolio of laser processing tools that complemented MKS existing businesses in vacuum deposition, photonics, and semiconductor materials. The deal closed on February 1, 2019, after regulatory and other approvals, and ESI became a wholly owned subsidiary of MKS. The ESIO ticker ceased to exist as of the close of trading on that date.
The product portfolio at the time of the acquisition grouped into four categories: printed circuit board, semiconductor, component test, and industrial machining. The PCB line dominated. Laser via drilling systems addressed electrical interconnect applications in flexible circuits, high density interconnect boards, and interconnect packages, using ultraviolet laser processing with single and multi beam configurations that delivered placement accuracy suited to the shrinking via dimensions of advanced consumer electronics. The semiconductor line covered wafer marking, wafer and circuit trim, and the Ultrus wafer scribing platform, which scribed thin film materials for 3D chip packaging where wafers had grown too thin for conventional mechanical saws. The component test line covered high capacity test and inspection equipment for multilayer ceramic capacitors, and the industrial machining line included the Garnet micromachining system and related tools for a broader set of end markets.
The moat was application depth rather than any single proprietary process. ESI had spent decades building process knowledge in laser microfabrication, and the company qualified its systems for high volume production at leading semiconductor and PCB manufacturers, a qualification process that takes time and creates switching costs. The 1983 public listing had been preceded by a long private era of product development, and the company had acquired several smaller technology firms, including Visicon Technologies in 2016, to extend its measurement and defect detection capabilities. Competition was intense, with rivals including LPKF Laser and Electronics, Mitsubishi Electric, Via Mechanics, EO Technics, InnoLas, DISCO, and Han's Laser, and the annual report noted that some customers developed in house equipment that competed with ESI. The company nonetheless held a leading position in flex via drilling, the product line that drove the fiscal 2018 revenue surge.
The technology base rested on lasers, optics, and motion control, with the Singapore facility serving as the primary systems manufacturing plant. Product development continued through the restructuring period, and the Ultrus platform, introduced in 2016 and qualified for high volume production in 2017, was a flagship example of the next generation product pipeline that made the company valuable to an acquirer. The product portfolio reviews that accompanied the 2017 restructuring also discontinued certain product lines, and the associated inventory and asset impairments were a visible drag on gross margin in fiscal 2018. The net effect was a leaner portfolio focused on the product lines with the strongest demand and the deepest installed base.
The final annual report showed a company in full recovery. Total net sales were $367.9 million, up 128 percent from the prior year. That line in turn was driven by flex via drilling demand, and the product mix shifted decisively toward printed circuit boards, which came to dominate the revenue base. Semiconductor revenue was $55.2 million, helped by the Ultrus scribing platform. The component test and industrial machining lines were smaller, and both also grew year over year. Asia accounted for 90 percent of net sales, a concentration that reflected the customer base for flex circuit drilling equipment in Korea and Taiwan. Gross margin expanded to 43.7 percent from 38.2 percent, aided by fixed cost absorption on higher volumes, though the improvement was partly offset by restructuring related inventory and asset write offs.
The bottom line swung from a loss to a profit of considerable size. Operating income was $75.9 million, against an operating loss in the prior year that had consumed 23.4 percent of sales. The margin on that operating income was 20.6 percent. The prior year income statement had carried a $7.4 million goodwill impairment, and the restructuring program added substantial charges across both fiscal years. Net income for the year was $116.2 million, a recovery from the prior year loss. Per share, that was $3.27 of diluted earnings against a $1.15 loss a year earlier. Operating cash flow for the year was $67.4 million.
The balance sheet at year end showed a company with ample liquidity and modest debt. Cash and cash equivalents stood at $76.8 million, alongside short term investments and a revolving credit facility that was undrawn. Long term debt was only $12.8 million, and backlog was $148.4 million, a figure that reflected the strength of flex circuit drilling demand entering the following year. Customer concentration was high. The top ten customers accounted for 59 percent of net sales, and two customers, Career Technology Manufacturing and Top Unique Trading, made up 30 percent of the total between them.
The last quarterly report, for the three months that closed in late December 2018, showed a company that had already begun to feel the end of the flex drilling upcycle. The quarter's net sales were $67.9 million, and the period also carried $4.3 million of merger and integration costs, a line item that had not existed a year before. Revenue was down sharply from the comparable prior year period. Net income was $6.3 million, a steep decline from the prior year quarter. Per diluted share, the figure was $0.18, against a per share result near $0.94 in the prior year quarter. The deceleration in that final pre merger quarter was a visible reminder that the flex circuit drilling cycle that had driven the surge the year before was already cooling.
There is no forward outlook for a defunct ticker. The last periodic report covered the quarter that ended in the final weeks of 2018, and the merger closed shortly afterward, in early 2019. Between the filing of that quarterly report and the closing of the transaction, the company filed a current report announcing the completion of the acquisition and notifying the exchange that trading in ESI common stock should be suspended. The registration termination under Section 12(g) followed a couple of weeks later, and no further periodic reports, current reports, or other filings have appeared on CIK 0000726514 since that date. The CIK remains in the EDGAR system as a historical record, but it carries no active filing obligations and no new information.
The execution risk that mattered at the time was the integration of ESI into MKS Instruments. The combined company inherited ESI's laser processing portfolio, its Singapore manufacturing base, its customer relationships in Korea and Taiwan, and the restructuring program that had been completed in the third quarter of the final fiscal year. The merger and integration costs of $4.3 million in the final pre merger quarter were the first visible cost of that integration. For a September 2026 reader, those questions are historical. The ESI business continues to operate within MKS, and the performance of the laser processing product lines since the acquisition belongs to the MKS Instruments research file rather than to the ESIO ticker.
The absence of any filing activity after 2019 is not anomalous for an acquired company. When a company is acquired in a cash merger, the surviving entity files its own periodic reports, and the target's CIK goes dormant. The SEC does not require the acquirer to continue filing on behalf of the target, and the registration termination ends the reporting obligation under Section 12(g). The dormant status of the CIK is the definitive evidence that the ticker is no longer in active use, and it is the finding that this note report documents.
The primary risk associated with a defunct ticker is identity confusion. The ESIO symbol is no longer in the SEC company tickers file, but third party data vendors may still carry stale mappings, and a casual search for ESIO returns the historical Electro Scientific Industries pages alongside unrelated uses of the string. The name Electro Scientific Industries has also been used by private companies in other contexts. A researcher pulling historical price data for ESIO without verifying the delisting date risks attributing pre merger prices to a post merger analysis, which produces meaningless results.
The secondary risk is stale data in quote systems. A stock quote page for the former Nasdaq listing may still display a last traded price, a figure that predates the February 1, 2019 delisting by more than seven years. Any automated process that ingests historical ticker data should flag ESIO as defunct and route it to a note report rather than a full research report. The last known price, the last known financial state, and the delisting event are documented in the filings, and they are sufficient to close the file.
The third risk is assuming continuity. The ESI brand persists within MKS Instruments, and the laser processing products that ESI sold continue to be manufactured and sold under the MKS umbrella. A casual search for the company name returns results that may suggest the business still operates independently. The reality is that the corporate entity Electro Scientific Industries, Inc. ceased to exist as a public company on February 1, 2019, when each share of common stock converted into cash and the shares were delisted. The Nasdaq listing, the ESIO ticker, and the periodic reporting obligation all terminated with the merger.
Valuation analysis for a defunct ticker is necessarily historical. The $30 per share price implied an equity value of roughly $1.03 billion, based on the share count. The all cash structure of the deal meant that the premium was fixed at announcement and did not move with the market price during the deal period. The price represented a premium over the undisturbed trading level in the months before the October 2018 announcement, and it reflected the strength of the fiscal 2018 recovery and the backlog entering the following fiscal year.
On a standalone basis, the implied equity value represented roughly 2.8 times the final year revenue and a meaningful multiple of the final year operating income, before the restructuring charges that depressed the prior year results. The final quarter before the merger closed showed an operating income margin of roughly 5.7 percent, a figure that suggested the flex drilling upcycle had already begun to cool and that the standalone earnings base entering the post merger period would have been lower than the fiscal 2018 peak. The acquirer's willingness to pay the fixed price reflected the value of the product portfolio, the installed base, and the pipeline rather than a simple multiple of the most recent quarterly earnings.
For a September 2026 reader, the valuation exercise has no forward application. The ESIO ticker carries no market value, no equity, and no claim on any operating assets. The appropriate question is no longer what the ticker is worth, but how the acquisition affected MKS Instruments. The performance of the ESI product lines within MKS, the integration costs, and the strategic value of the laser processing portfolio to the combined company belong to a different research assignment. The ESIO ticker retains value only as a historical data point in the semiconductor and laser equipment consolidation of 2019.
The ESIO ticker is defunct. Electro Scientific Industries, Inc., the laser microfabrication equipment maker that the ticker identified, ceased to exist as a public company when MKS Instruments completed its all cash acquisition in early 2019. The Nasdaq delisted the shares the same day the deal closed, and the registration termination under Section 12(g) followed a couple of weeks later. The last periodic filing was a quarterly report for the quarter that closed in late December 2018, and the last annual report was for the fiscal year that closed in March of that year. The gap between that last periodic filing and the present exceeds seven years. No filings of any kind have appeared on CIK 0000726514 since the merger closed, and the ticker does not appear in the current SEC company tickers file.
The finding carries a practical implication for the pipeline. Any automated process that pulls the ESIO ticker from a watchlist or a historical universe should flag it as defunct and route it to a note report rather than a full research report. The note report format, which is what this document is, documents the identity verification, the delisting event, and the last known financial state of the company. It does not attempt to project forward financials, estimate a current valuation, or assess an investment thesis, because none of those activities are meaningful for a company that has been absorbed into a larger entity for more than seven years.
The broader lesson is that ticker symbols are not permanent, and that a strong final year of earnings does not guarantee a long public life. ESI exited the public markets at the peak of a product cycle, with a backlog near $150 million and a cash balance of $76.8 million. The operating income margin in the final full fiscal year had been 20.6 percent. The acquisition resolved the cyclical risk in the flex circuit drilling revenue base by transferring the product lines to a larger, more diversified platform. The ESIO ticker is a historical artifact, and this report closes the file.