Supernus Pharmaceuticals (SUPN) Stock Analysis & Price (Updated Oct 16, 2026, 4:00 PM ET)

Updated Oct 16, 2026, 4:00 PM ET

What changed since yesterday

Closed at $37.88, -4.27% vs the prior close of $39.57.
Volume 1.44M shares, 2.1x its 50-day average (heavy).
New SEC filings: 8-K (Oct 15, 2026).
No new insider buys or sales reported since the prior session.

SUPN slides 4.3% to $37.88, a 52-week low on 2.1x normal volume. Closed at $37.88, -4.27% vs the prior close of $39.57. Day range $37.54–$39.49, opened at $39.19.

Last close$37.88-4.27%

Day range37.54–39.49

Open39.19

Volume1.44M

52-week range37.54–59.68

Avg volume (20d)779.14K

SUPN daily analysis — what happened

A plain-English, data-only note written after every US trading day. Newest first; older days stay archived below.

Oct 16, 2026 — SUPN slides 4.3% to $37.88, a 52-week low on 2.1x normal volume

Closed at $37.88, -4.27% vs the prior close of $39.57. Day range $37.54–$39.49, opened at $39.19.
Volume was 1.44M shares, 2.1x its 50-day average of 678.95K — unusually heavy trading.
Price is -13.6% vs its 50-day average ($43.83) and -20.7% vs its 200-day average ($47.76).
52-week range $37.54–$59.68; today's close sits at 2% of that range, 36.5% below the 52-week high.
That makes 4 straight losses.

Oct 15, 2026 — SUPN dips 1.5% to $39.57, a 52-week low, 3 down days in a row

Closed at $39.57, -1.52% vs the prior close of $40.18. Day range $39.36–$41.31, opened at $40.21.
Volume was 1.01M shares, 1.5x its 50-day average of 692.12K.
Price is -10.1% vs its 50-day average ($44.01) and -17.2% vs its 200-day average ($47.82).
52-week range $39.36–$59.68; today's close sits at 1% of that range, 33.7% below the 52-week high.
That makes 3 straight losses.
SEC filings that day: 8-K.

Oct 14, 2026 — SUPN slides 4.4% to $40.18, a 52-week low

Closed at $40.18, -4.36% vs the prior close of $42.01. Day range $39.97–$43.26, opened at $41.93.
Volume was 906.70K shares, 1.2x its 50-day average of 748.10K.
Price is -9.0% vs its 50-day average ($44.16) and -16.1% vs its 200-day average ($47.88).
52-week range $39.97–$59.68; today's close sits at 1% of that range, 32.7% below the 52-week high.

Oct 13, 2026 — SUPN dips 1.9% to $42.01

Closed at $42.01, -1.87% vs the prior close of $42.81. Day range $41.71–$43.29, opened at $42.94.
Volume was 1.20M shares, 1.5x its 50-day average of 814.53K.
Price is -5.0% vs its 50-day average ($44.22) and -12.4% vs its 200-day average ($47.93).
52-week range $40.51–$59.68; today's close sits at 8% of that range, 29.6% below the 52-week high.

Oct 12, 2026 — SUPN rises 0.3% to $42.81

Closed at $42.81, +0.33% vs the prior close of $42.67. Day range $41.90–$43.20, opened at $42.67.
Volume was 914.60K shares, 1.1x its 50-day average of 807.71K.
Price is -3.4% vs its 50-day average ($44.30) and -10.8% vs its 200-day average ($47.98).
52-week range $40.51–$59.68; today's close sits at 12% of that range, 28.3% below the 52-week high.

Oct 9, 2026 — SUPN rises 1.3% to $42.67

Closed at $42.67, +1.26% vs the prior close of $42.14. Day range $42.15–$43.14, opened at $42.18.
Volume was 643.80K shares, 0.8x its 50-day average of 804.17K.
Price is -3.8% vs its 50-day average ($44.33) and -11.2% vs its 200-day average ($48.03).
52-week range $40.51–$59.68; today's close sits at 11% of that range, 28.5% below the 52-week high.

Oct 8, 2026 — SUPN dips 2.1% to $42.14

Closed at $42.14, -2.11% vs the prior close of $43.05. Day range $41.14–$43.41, opened at $42.41.
Volume was 684.20K shares, 0.9x its 50-day average of 800.93K.
Price is -5.1% vs its 50-day average ($44.39) and -12.3% vs its 200-day average ($48.07).
52-week range $40.51–$59.68; today's close sits at 9% of that range, 29.4% below the 52-week high.

Oct 7, 2026 — SUPN rises 0.5% to $43.05, 4 up days in a row

Closed at $43.05, +0.51% vs the prior close of $42.83. Day range $42.24–$43.38, opened at $42.24.
Volume was 571.00K shares, 0.7x its 50-day average of 800.27K.
Price is -3.2% vs its 50-day average ($44.48) and -10.5% vs its 200-day average ($48.12).
52-week range $40.51–$59.68; today's close sits at 13% of that range, 27.9% below the 52-week high.
That makes 4 straight gains.

Oct 6, 2026 — SUPN ends flat (+0.2%) to $42.83, 3 up days in a row

Closed at $42.83, +0.16% vs the prior close of $42.76. Day range $41.40–$43.12, opened at $42.86.
Volume was 748.30K shares, 0.9x its 50-day average of 795.77K.
Price is -3.9% vs its 50-day average ($44.58) and -11.0% vs its 200-day average ($48.15).
52-week range $40.51–$59.68; today's close sits at 12% of that range, 28.2% below the 52-week high.
That makes 3 straight gains.

Oct 5, 2026 — SUPN rises 0.9% to $42.76

Closed at $42.76, +0.90% vs the prior close of $42.38. Day range $42.38–$43.20, opened at $42.38.
Volume was 1.29M shares, 1.7x its 50-day average of 780.44K.
Price is -4.3% vs its 50-day average ($44.66) and -11.2% vs its 200-day average ($48.18).
52-week range $40.51–$59.68; today's close sits at 12% of that range, 28.4% below the 52-week high.

Oct 2, 2026 — SUPN rises 0.5% to $42.38

Closed at $42.38, +0.47% vs the prior close of $42.18. Day range $41.88–$43.15, opened at $42.47.
Volume was 739.80K shares, 1.0x its 50-day average of 774.91K.
Price is -5.2% vs its 50-day average ($44.73) and -12.1% vs its 200-day average ($48.21).
52-week range $40.51–$59.68; today's close sits at 10% of that range, 29.0% below the 52-week high.

SUPN latest news & SEC filings

Every SEC filing by or about SUPN in the last 120 days, explained in plain English. Updated daily, with a same-day refresh for new filings.

Oct 15, 2026 · Form 8-K — Major event / current report

Current report — a filing companies must make within 4 business days of a major event

Item 5.07 — Reported shareholder vote results.

Source: SEC EDGAR filing 0001356576-26-000040

Oct 6, 2026 · Form 425 — 425 filing

425 filing

Source: SEC EDGAR filing 0001104659-26-113884

Oct 6, 2026 · Form DEFA14A — Additional proxy materials

Additional proxy materials

Source: SEC EDGAR filing 0001104659-26-113882

Sep 11, 2026 · Form DEFM14A — DEFM14A filing

DEFM14A filing

Source: SEC EDGAR filing 0001104659-26-107109

Aug 14, 2026 · Form 4 — Insider trade