Why Is Apellis Pharmaceuticals (APLS) Stock Up +138% Today?
Key Takeaways
- APLS shares surged approximately +138.56% in premarket trading on March 31, 2026, from a prior close of $17.09 to a premarket price of approximately $40.77
- The primary catalyst is a definitive acquisition agreement announced by Biogen (BIIB), which agreed to acquire all outstanding shares of Apellis for $41.00 per share in cash, representing an upfront equity consideration of approximately $5.6 billion
- Shareholders will also receive a contingent value right (CVR) payable upon achievement of certain revenue thresholds tied to global net sales of SYFOVRE®
- The deal is expected to close in Q2 2026, subject to regulatory approvals and customary closing conditions
- The acquisition brings two commercialized immunology medicines — SYFOVRE® and EMPAVELI® — into Biogen's portfolio, which together generated $689 million in 2025 U.S. product revenue
- Traders are watching for shareholder approval, antitrust review outcomes, and any competing bids that could emerge ahead of the close
Opening Summary
Apellis Pharmaceuticals, Inc. (APLS) is a Waltham, Massachusetts-based biopharmaceutical company specializing in targeted complement therapies, best known for SYFOVRE® (pegcetacoplan intravitreal injection) for geographic atrophy and EMPAVELI® (pegcetacoplan subcutaneous injection) approved across three indications, including two rare kidney diseases. Shares of APLS surged approximately 138.56% in premarket trading on March 31, 2026, moving from a prior session close of $17.09 to roughly $40.77 — just below the $41.00 per share acquisition price agreed upon with Biogen (BIIB). The move is entirely acquisition-driven, with Biogen announcing a definitive agreement to purchase all outstanding APLS shares in an all-cash transaction valued at approximately $5.6 billion.
Biogen Acquisition Announcement
Biogen (BIIB) and Apellis jointly announced on the morning of March 31, 2026, that they have entered into a definitive merger agreement under which Biogen will acquire all outstanding shares of APLS for $41.00 per share in cash at closing, implying an upfront equity value of approximately $5.6 billion. In addition to the upfront cash consideration, APLS shareholders will receive a contingent value right (CVR) per share, which becomes payable if Apellis' flagship drug SYFOVRE® reaches certain global net sales milestones. The deal is expected to close in the second quarter of 2026, pending regulatory approvals and customary closing conditions.
Strategic Rationale
The acquisition is structured to strengthen Biogen's (BIIB) growth profile by adding two differentiated, revenue-generating immunology medicines. SYFOVRE®, approved for geographic atrophy — an immune-mediated retinal disease — achieved injection volume growth of 17% year-over-year in fiscal 2025 and currently holds a 60% market share in the geographic atrophy treatment category. EMPAVELI®, with FDA approval across three indications including C3G and IC-MPGN (rare kidney diseases), posted more than $102 million in 2025 U.S. revenues and had over 267 cumulative patient starts as of year-end 2025. Together, these products recorded $689 million in 2025 U.S. revenues and are expected to grow at a mid-to-high teen percentage rate at least through 2028.
Financial Impact on Biogen
Biogen (BIIB) stated that the transaction is expected to be increasingly accretive to non-GAAP diluted earnings per share beginning in 2027, and is projected to meaningfully increase Biogen's non-GAAP EPS compound annual growth rate (CAGR) through the end of the decade. Apellis' deep expertise in complement science is also expected to accelerate Biogen's entry into the nephrology space and enhance launch readiness for felzartamab, Biogen's own compound currently in Phase 3 clinical trials. Biogen views the combined commercialization capabilities of both organizations as key to maximizing the long-term potential of SYFOVRE® and EMPAVELI® globally.
Market Context and Trading Activity
Premarket volume for APLS spiked dramatically on the news, with approximately 157,000 shares trading in the premarket session alone — compared to an average premarket volume of roughly 9,158 shares over the prior 30 days, representing more than a 17-fold surge in early activity. The stock's premarket price of approximately $40.77 is trading at a very narrow discount to the $41.00 per-share acquisition price, as is typical in merger-arbitrage situations once a deal is announced at a fixed cash consideration. Broader biotech sector indices were not the driver here — the move is entirely idiosyncratic and deal-specific, driven by the acquisition premium over the prior $17.09 close.
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What Comes Next for APLS
With a definitive acquisition agreement in place at $41.00 per share, the primary variables for APLS shareholders now center on deal completion risk rather than fundamental operating performance. The transaction is expected to close in Q2 2026, and key milestones include receipt of antitrust clearance — particularly from the FTC and potentially international regulators — as well as an APLS shareholder vote. Should any regulatory challenges arise or a competing bid emerge, the share price dynamics could shift materially. The CVR tied to SYFOVRE® global net sales represents an additional potential payout for shareholders, and the outcome of SYFOVRE's prefilled syringe submission in the first half of 2026 could be relevant to that milestone. Until the transaction closes, APLS will continue reporting quarterly results, with analysts and market participants focused on maintaining commercial execution of SYFOVRE® and EMPAVELI® to support deal accretion projections.
Disclaimer
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APLS in upward trend: 10-day moving average broke above 50-day moving average on April 01, 2026
The 10-day moving average for APLS crossed bullishly above the 50-day moving average on April 01, 2026. This indicates that the trend has shifted higher and could be considered a buy signal. In of 14 past instances when the 10-day crossed above the 50-day, the stock continued to move higher over the following month. The odds of a continued upward trend are .
Technical Analysis (Indicators)
Bullish Trend Analysis
The Momentum Indicator moved above the 0 level on March 31, 2026. You may want to consider a long position or call options on APLS as a result. In of 78 past instances where the momentum indicator moved above 0, the stock continued to climb. The odds of a continued upward trend are .
The Moving Average Convergence Divergence (MACD) for APLS just turned positive on March 31, 2026. Looking at past instances where APLS's MACD turned positive, the stock continued to rise in of 51 cases over the following month. The odds of a continued upward trend are .
APLS moved above its 50-day moving average on March 31, 2026 date and that indicates a change from a downward trend to an upward trend.
The 50-day moving average for APLS moved above the 200-day moving average on April 09, 2026. This could be a long-term bullish signal for the stock as the stock shifts to an upward trend.
Following a 3-day Advance, the price is estimated to grow further. Considering data from situations where APLS advanced for three days, in of 278 cases, the price rose further within the following month. The odds of a continued upward trend are .
Bearish Trend Analysis
The RSI Indicator demonstrates that the ticker has stayed in the overbought zone for 7 days. The longer the ticker stays in the overbought zone, the sooner a price pull-back is expected.
The Stochastic Oscillator demonstrated that the ticker has stayed in the overbought zone for 5 days. The longer the ticker stays in the overbought zone, the sooner a price pull-back is expected.
Following a 3-day decline, the stock is projected to fall further. Considering past instances where APLS declined for three days, the price rose further in of 62 cases within the following month. The odds of a continued downward trend are .
APLS broke above its upper Bollinger Band on March 31, 2026. This could be a sign that the stock is set to drop as the stock moves back below the upper band and toward the middle band. You may want to consider selling the stock or exploring put options.
The Aroon Indicator for APLS entered a downward trend on March 30, 2026. This could indicate a strong downward move is ahead for the stock. Traders may want to consider selling the stock or buying put options.
The Tickeron PE Growth Rating for this company is (best 1 - 100 worst), pointing to outstanding earnings growth. The PE Growth rating is based on a comparative analysis of stock PE ratio increase over the last 12 months compared against S&P 500 index constituents.
The Tickeron Price Growth Rating for this company is (best 1 - 100 worst), indicating steady price growth. APLS’s price grows at a higher rate over the last 12 months as compared to S&P 500 index constituents.
The Tickeron SMR rating for this company is (best 1 - 100 worst), indicating slightly better than average sales and a considerably profitable business model. SMR (Sales, Margin, Return on Equity) rating is based on comparative analysis of weighted Sales, Income Margin and Return on Equity values compared against S&P 500 index constituents. The weighted SMR value is a proprietary formula developed by Tickeron and represents an overall profitability measure for a stock.
The Tickeron Valuation Rating of (best 1 - 100 worst) indicates that the company is significantly overvalued in the industry. This rating compares market capitalization estimated by our proprietary formula with the current market capitalization. This rating is based on the following metrics, as compared to industry averages: P/B Ratio (14.085) is normal, around the industry mean (26.162). P/E Ratio (226.611) is within average values for comparable stocks, (45.457). Projected Growth (PEG Ratio) (0.000) is also within normal values, averaging (1.767). Dividend Yield (0.000) settles around the average of (0.034) among similar stocks. P/S Ratio (5.277) is also within normal values, averaging (317.372).
The Tickeron Profit vs. Risk Rating rating for this company is (best 1 - 100 worst), indicating that the returns do not compensate for the risks. APLS’s unstable profits reported over time resulted in significant Drawdowns within these last five years. A stable profit reduces stock drawdown and volatility. The average Profit vs. Risk Rating rating for the industry is 95, placing this stock worse than average.
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General Information
a developer of therapeutics and drug delivery technologies to address chronic inflammatory diseases
Industry Biotechnology
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