What Factors Did InPlay Record for Arrowhead Pharmaceuticals (ARWR) on September 15, 2026, and How Did It Perform?
On September 15, 2026, InPlay recorded Arrowhead Pharmaceuticals, Inc. (ARWR) as In-Play with a score of 1 and an Alpha classification. Key factors observed included a 2.45% gap above the previous close and a relative volume (RVOL) of 1.62. The stock experienced a significant session decline, closing 12.3962% below its previous session's close. A news headline referenced "ARWR Stock On Track For Worst Day In Over A Year Despite Positive Early-Stage Data For Cholesterol Drug – Retail Dismisses ‘Sell The News’ Reaction," appearing alongside the event, although News was not recorded as an In-Play reason for this specific event.
Arrowhead Pharmaceuticals' In-Play Metrics on September 15, 2026
Arrowhead Pharmaceuticals (ARWR) was one of 10 companies recorded as In-Play by InPlay.finance on September 15, 2026. This marked ARWR's latest appearance in InPlay's historical records, bringing its total recorded In-Play appearances to 11 since October 1, 2025. On this particular day, ARWR was the only company to receive an Alpha classification.
The specific metrics recorded by InPlay for ARWR on September 15, 2026, included:
- InPlay Score: 1
- Alpha Status: True (ARWR was an Alpha-classified stock)
- Gap Percentage: 2.45%
- Relative Volume (RVOL): 1.62
- Range Percentage: 2.14%
The In-Play reasons recorded for ARWR on this date included "Intraday momentum: $gap 1.34", "ATR 5.59", and "RVOL 1.62x". The archived market snapshot captured at 21:10:03+00:00 showed a last price of 70.96.
News Context Surrounding ARWR's In-Play Event
Although "News" was not explicitly listed as an In-Play reason for ARWR on September 15, 2026, a specific historical news reference was available alongside the event. This headline read: "ARWR Stock On Track For Worst Day In Over A Year Despite Positive Early-Stage Data For Cholesterol Drug – Retail Dismisses ‘Sell The News’ Reaction." This news reference provides context for the trading activity observed in ARWR during the session.
How Did ARWR Stock Perform During the September 15, 2026 Session?
The trading session on September 15, 2026, saw Arrowhead Pharmaceuticals (ARWR) close significantly lower. Here's a breakdown of its session outcome:
- Previous Session Close (September 14, 2026): 80.67
- Event Session Open (September 15, 2026): 82.82
- Event Session High (September 15, 2026): 83.55
- Event Session Low (September 15, 2026): 70.605
- Event Session Close (September 15, 2026): 70.67
- Event Session Volume (September 15, 2026): 4,324,239
- Event Session Close Change: -12.3962% (compared to the previous session's close)
The stock opened above its previous close but then moved substantially lower throughout the session, reflecting a notable decline by the close.
ARWR's In-Play Metrics Compared to Historical Averages
Comparing ARWR's September 15, 2026, In-Play appearance to its historical activity provides additional context:
- In-Play Appearances: ARWR has been recorded as In-Play 11 times, with 3 of these appearances also classified as Alpha.
- Average InPlay Score: Across all recorded appearances, ARWR has an average score of 2.8. The score of 1 on September 15, 2026, was below this average.
- Average Gap Percentage: ARWR's historical average gap_pct is 4.914%. The 2.45% gap recorded on September 15, 2026, was below this average. The largest recorded gap_pct for ARWR was 13.23% on January 6, 2026.
- Average Relative Volume (RVOL): The historical average RVOL for ARWR is 1.114. The RVOL of 1.62 on September 15, 2026, was above this average, indicating higher relative trading activity. Its highest recorded RVOL was 2.58 on January 8, 2026.
- Average Range Percentage: ARWR's average range_pct is 2.14%. The 2.14% range_pct recorded on September 15, 2026, matched this average and was also its largest recorded range_pct.
On September 15, 2026, the average gap_pct across all 10 In-Play companies was -0.397%, and the average RVOL was 1.865. ARWR's gap_pct of 2.45% was above the day's average, while its RVOL of 1.62 was slightly below the day's average.
ARWR's Previous In-Play Appearances with News
Several of ARWR's past In-Play appearances also had 'News' recorded as an In-Play reason, although specific headlines were not always persisted in the historical records for those dates. For example:
- March 17, 2026: Recorded with 'Gap', 'Near YH', and 'News' as reasons. The stock closed 4.5777% higher in the event session. The next session closed 1.4938% lower, and five sessions later, it closed 5.5585% higher.
- January 8, 2026: Recorded with 'Gap', 'Near YH', and 'News' as reasons. The stock closed 1.0504% lower in the event session. The next session closed 1.4% higher, and five sessions later, it closed 3.1538% higher.
- January 7, 2026: Recorded with 'Gap', 'Near YH', and 'News' as reasons, and an Alpha classification. The stock closed 7.2306% lower in the event session. The next session closed 1.0504% lower, and five sessions later, it closed 5.937% higher.
- January 6, 2026: Recorded with 'Gap', 'Near YH', and 'News' as reasons. The stock closed 10.8485% higher in the event session. The next session closed 7.2306% lower, and five sessions later, it closed 9.8432% lower.
- November 26, 2025: Recorded with 'Gap', 'Near YH', and 'News' as reasons, and an Alpha classification. The stock closed 23.3383% higher in the event session. The next session closed 8.6813% lower, and five sessions later, it closed 12.043% higher.
These examples illustrate that ARWR has historically shown significant movement during and after In-Play sessions, with 'News' frequently being a recorded factor, even when specific headlines are not retained in all older records.
Summary of ARWR's In-Play Event
The InPlay record for Arrowhead Pharmaceuticals (ARWR) on September 15, 2026, highlights a day of notable activity, characterised by a positive gap, elevated relative volume, and an Alpha classification. Despite the initial gap up, the stock experienced a significant decline during the session. The accompanying news headline, detailing positive early-stage data but also referencing a "sell the news" reaction, provides valuable context for the observed price action. InPlay's data captures these specific factors and the subsequent session outcome, offering a factual historical record of ARWR's trading activity.
