Glaukos Soars 22.8% on Clinical Data, InterDigital Plummets 15.9% Post-Earnings as S&P 500 Rises
U.S. equities closed positively on April 30, 2026, with the S&P 500 advancing 1.02%. Healthcare firm Glaukos Corporation led the gainers, surging over 22% on positive clinical trial news, while InterDigital, Inc. plunged nearly 16% after a disappointing earnings report and weak guidance.
The broader market saw a positive session, with the S&P 500 gaining 1.02%. Among the top performers, Glaukos Corporation (GKOS) led the charge, rocketing 22.84% to $143.67. The ophthalmology company's shares surged following an announcement of positive interim data from its Phase 2 clinical trial for GLK-301, an investigational drug targeting presbyopia. The trial showed statistically significant improvement in near vision without significant adverse events, fueling investor optimism for its future pipeline.
Technology firm Impinj, Inc. (PI) was another standout, climbing 20.73% to $144.92. The surge came after Impinj reported first-quarter earnings that not only exceeded analyst expectations for both revenue and EPS but also provided an optimistic outlook for the remainder of the year, driven by robust demand for its RFID solutions. Other significant winners included industrial services provider Quanta Services, Inc. (PWR), up 15.78%, autonomous technology developer Aurora Innovation, Inc. (AUR), which gained 15.52%, and semiconductor giant QUALCOMM Incorporated (QCOM), advancing 15.12%.
On the downside, InterDigital, Inc. (IDCC) experienced the steepest decline, plummeting 15.91% to $296.56. The intellectual property and technology licensing company's shares fell sharply after reporting first-quarter earnings that missed consensus estimates and providing a weaker-than-anticipated revenue guidance for the second quarter, primarily due to delays in securing new licensing agreements. Notably, despite today's significant drop, InterDigital saw multiple insider buys from its executives, including Chen Lawrence Liren, HUTCHESON STEWART D, ABERLE DEREK K, and RANKIN JEAN F, on April 22, 2026, suggesting that some internal stakeholders may view the stock as undervalued after the dip.
Other notable decliners included online furniture retailer Wayfair Inc. (W), which fell 12.75%, and industrial pump manufacturer Flowserve Corporation (FLS), down 12.59%. Technology company Belden Inc. (BDC) also saw a significant drop of 11.78%, while financial services firm Willis Towers Watson Public Limited Company (WTW) closed down 11.69%. The mixed performance across sectors, particularly within technology, indicates a focus on individual company fundamentals rather than a broad sector rotation.
Today's Biggest Movers
| Symbol | Category | Return | Price | Sector |
|---|---|---|---|---|
| GKOS | Winner | +22.84% | $143.67 | Healthcare |
| PI | Winner | +20.73% | $144.92 | Technology |
| PWR | Winner | +15.78% | $727.77 | Industrials |
| AUR | Winner | +15.52% | $5.88 | Technology |
| QCOM | Winner | +15.12% | $179.58 | Technology |
| IDCC | Loser | -15.91% | $296.56 | Technology |
| W | Loser | -12.75% | $63.93 | Consumer Cyclical |
| FLS | Loser | -12.59% | $73.64 | Industrials |
| BDC | Loser | -11.78% | $112.48 | Technology |
| WTW | Loser | -11.69% | $256.20 | Financial Services |
Market Context
Key Takeaways
- Glaukos Corporation shares soared over 22% following positive interim Phase 2 clinical trial data for its presbyopia drug, GLK-301.
- Impinj, Inc. surged over 20% after reporting strong Q1 earnings that beat expectations and offering an optimistic full-year outlook.
- InterDigital, Inc. plunged nearly 16% due to a Q1 earnings miss and lower-than-expected Q2 revenue guidance, citing licensing delays.
- Despite InterDigital's sharp decline, several company insiders made significant stock purchases just days prior, on April 22.
- The market's mixed performance, especially in technology, highlighted stock-specific catalysts over broad sector trends.