RNAAtrium Therapeutics, Inc.Healthcare · Biotechnologyas of 2026-09-16
Horizon

Issued 2026-09-16 at $9.50 · now $9.50 (2026-09-16, +0.0% since)

Based on its own history, a month from the 2026-09-16 close, RNA has typically landed between $7.91 and $11.31 — a range of −16.7% to +19.1% from the issuance price $9.50.

Range of outcomes in historically similar periods — not a price prediction. Ranges are scored publicly on /methodology.
  • Actual close
  • Typical path (median)
  • Middle 50% of outcomes
  • 90% range

118 overlapping 1 month windows · 2026-02-272026-08-17 · basis climatology · forecast (batch).

The cone is anchored at the 2026-09-16 issuance close ($9.50) — the price the forecast resolves against on 2026-10-15, not the latest close. The drawn path shape is illustrative (bands widen with √t); every labeled number is real — the anchor, the scored batch p90/IQR endpoints, and the typical move.

Where RNA has typically landed a month from the 2026-09-16 close of $9.5 — the range is history, not a prediction.

$7.91worst · -16.7%$11.31best · +19.1%
  • now $9.5 (+0.0%)
  • typicalThe typical outcome — half of similar past periods did better and half did worse (not an average, so a few wild periods don't skew it). $9.14 (-3.8%)
  • middle 50%The central range of outcomes — half of similar past periods landed inside it, a quarter finished above, a quarter below. $8.55$9.73
  • 90% rangeA nine-in-ten range — in about nine of every ten similar past periods the outcome stayed within these bounds. $7.91$11.31
Actual 1-month windows behind the coneiEvery overlapping 1-month window in this security's own price history was ranked by realized return; shown are the 3 worst and 3 best of 118 windows spanning 2026-02-27 to 2026-09-16. Not cherry-picked — these are the extremes of the full sample. Max drop / max rise are the deepest and highest points reached within each window. See /methodology.
StartReturnMax dropMax rise
3 worst
2026-08-17−26.7%−26.7%+12.7%
2026-08-14−21.4%−21.4%+13.7%
2026-03-04−18.7%−25.5%+0.0%
3 best
2026-07-29+25.0%+0.0%+25.2%
2026-08-05+24.4%+0.0%+24.4%
2026-08-04+21.8%+0.0%+21.8%

118 overlapping windows · 2026-02-272026-09-16 · not cherry-picked

Reported insider & political trades

Every Form 4 the people closest to this company have filed with the SEC — plotted against the share price, aggregated by month, and shown with the gap between when each trade happened and when it was disclosed. A public record, not advice.

Share price & reported tradesMonthly open-market valueReporting lag — trade date to filing date2026-092026-082026-072026-062026-052026-042026-032026-022026-012025-122025-112025-102025-092025-08$17$102026-01-21: 11 insider sales, $2.5M — Boyce Sarah, Flanagan W. Michael, Hughes Steven George, MacLean Michael F …2026-01-07: 7 insider sales, $1.7M — Boyce Sarah, Calderaro Charles III, Moriarty John B, Hughes Steven George …2025-10-22: 1 insider sale, $105K — Hughes Steven George2025-10-15: 1 insider sale, $1.0M — McCarthy Teresa2025-10-03: 1 insider sale, $298K — Mosbrooker Eric2025-09-22: 1 insider sale, $90K — Hughes Steven George2025-09-15: 2 insider sales, $691K — McCarthy Teresa, Hughes Steven George2025-09-11: 1 insider sale, $779K — Flanagan W. Michael2025-09-05: 3 insider sales, $4.0M — Boyce Sarah, WILSON TROY EDWARD …2025-09-03: 1 insider sale, $309K — Mosbrooker Eric2025-09-02: 1 insider sale, $9K — Gallagher Kathleen P.2025-08-28: 1 insider sale, $1.2M — Boyce Sarah2025-08-22: 1 insider sale, $102K — Hughes Steven George2025-08-15: 1 insider sale, $466K — McCarthy Teresa2025-08-13: 1 insider sale, $72K — Hughes Steven George2025-08: 18 open-market sales, $20.4M2025-09: 9 open-market sales, $5.8M2025-10: 3 open-market sales, $1.4M2026-01: 18 open-market sales, $4.2M↑ buys↓ salesdirector Boyce Sarah — Sale on 2026-01-21, filed 2 days after the tradedirector Boyce Sarah — Sale on 2026-01-21, filed 2 days after the tradedirector Flanagan W. Michael — Sale on 2026-01-21, filed 2 days after the tradeofficer Hughes Steven George — Sale on 2026-01-21, filed 2 days after the tradedirector MacLean Michael F — Sale on 2026-01-21, filed 2 days after the tradedirector Flanagan W. Michael — Sale on 2026-01-21, filed 2 days after the tradeofficer Hughes Steven George — Sale on 2026-01-21, filed 2 days after the tradedirector MacLean Michael F — Sale on 2026-01-21, filed 2 days after the tradedirector LEVIN ARTHUR A — Sale on 2026-01-21, filed 2 days after the tradeofficer McCarthy Teresa — Sale on 2026-01-21, filed 2 days after the tradeofficer McCarthy Teresa — Sale on 2026-01-21, filed 2 days after the tradedirector Boyce Sarah — Sale on 2026-01-07, filed 2 days after the tradeofficer Calderaro Charles III — Sale on 2026-01-07, filed 2 days after the tradeofficer Moriarty John B — Sale on 2026-01-07, filed 2 days after the tradeofficer Hughes Steven George — Sale on 2026-01-07, filed 2 days after the tradedirector Flanagan W. Michael — Sale on 2026-01-07, filed 2 days after the tradedirector MacLean Michael F — Sale on 2026-01-07, filed 2 days after the tradeofficer McCarthy Teresa — Sale on 2026-01-07, filed 2 days after the tradeofficer Hughes Steven George — Sale on 2025-10-22, filed 2 days after the tradeofficer McCarthy Teresa — Sale on 2025-10-15, filed 2 days after the tradeofficer Mosbrooker Eric — Sale on 2025-10-03, filed 4 days after the tradeofficer Hughes Steven George — Sale on 2025-09-22, filed 1 day after the tradeofficer McCarthy Teresa — Sale on 2025-09-15, filed 2 days after the tradeofficer Hughes Steven George — Sale on 2025-09-15, filed 2 days after the tradedirector Flanagan W. Michael — Sale on 2025-09-11, filed 1 day after the tradedirector Boyce Sarah — Sale on 2025-09-05, filed same daydirector WILSON TROY EDWARD — Sale on 2025-09-05, filed 4 days after the tradedirector WILSON TROY EDWARD — Sale on 2025-09-05, filed 4 days after the tradeofficer Mosbrooker Eric — Sale on 2025-09-03, filed 2 days after the tradedirector Gallagher Kathleen P. — Sale on 2025-09-02, filed same daydirector Boyce Sarah — Sale on 2025-08-28, filed 1 day after the tradeofficer Hughes Steven George — Sale on 2025-08-22, filed same dayofficer McCarthy Teresa — Sale on 2025-08-15, filed same dayofficer Hughes Steven George — Sale on 2025-08-13, filed 2 days after the trade
DatePersonRoleActionShares @ priceValueOwnership Δvs S&P 1mvs S&P 6mOwned afterFiling
2026-01-21Boyce SarahdirectorSale7,993 @ $72.45$579K−2.9% of holdingnot yet — horizon still opennot yet — horizon still open269,007Form 4 · filed 2 days after the trade
2026-01-21Boyce SarahdirectorSale6,394 @ $72.45$463K−2.3% of holdingnot yet — horizon still opennot yet — horizon still open277,000Form 4 · filed 2 days after the trade
2026-01-21Flanagan W. MichaeldirectorSale3,976 @ $72.45$288K−4.3% of holdingnot yet — horizon still opennot yet — horizon still open87,651Form 4 · filed 2 days after the trade
2026-01-21Hughes Steven GeorgeofficerSale2,878 @ $72.45$209K−8.3% of holdingnot yet — horizon still opennot yet — horizon still open31,599Form 4 · filed 2 days after the trade
2026-01-21MacLean Michael FdirectorSale2,735 @ $72.45$198K−4.4% of holdingnot yet — horizon still opennot yet — horizon still open59,290Form 4 · filed 2 days after the trade
2026-01-21Flanagan W. MichaeldirectorSale2,558 @ $72.45$185K−2.9% of holdingnot yet — horizon still opennot yet — horizon still open85,093Form 4 · filed 2 days after the trade
2026-01-21Hughes Steven GeorgeofficerSale2,017 @ $72.45$146K−5.5% of holdingnot yet — horizon still opennot yet — horizon still open34,477Form 4 · filed 2 days after the trade
2026-01-21MacLean Michael FdirectorSale1,807 @ $72.45$131K−2.8% of holdingnot yet — horizon still opennot yet — horizon still open62,025Form 4 · filed 2 days after the trade
2026-01-21LEVIN ARTHUR AdirectorSale1,758 @ $72.45$127K−9.6% of holdingnot yet — horizon still opennot yet — horizon still open16,562Form 4 · filed 2 days after the trade
2026-01-21McCarthy TeresaofficerSale1,476 @ $72.45$107K−1.3% of holdingnot yet — horizon still opennot yet — horizon still open115,391Form 4 · filed 2 days after the trade
2026-01-21McCarthy TeresaofficerSale1,453 @ $72.45$105K−1.3% of holdingnot yet — horizon still opennot yet — horizon still open113,938Form 4 · filed 2 days after the trade
2026-01-07Boyce SarahdirectorSale8,576 @ $72.23$619K−2.9% of holdingnot yet — horizon still opennot yet — horizon still open283,394Form 4 · filed 2 days after the trade
2026-01-07Calderaro Charles IIIofficerSale3,727 @ $72.23$269K−7.0% of holdingnot yet — horizon still opennot yet — horizon still open49,797Form 4 · filed 2 days after the trade
2026-01-07Moriarty John BofficerSale2,374 @ $72.23$171K−3.1% of holdingnot yet — horizon still opennot yet — horizon still open74,557Form 4 · filed 2 days after the trade
2026-01-07Hughes Steven GeorgeofficerSale2,373 @ $72.23$171K−6.1% of holdingnot yet — horizon still opennot yet — horizon still open36,494Form 4 · filed 2 days after the trade
2026-01-07Flanagan W. MichaeldirectorSale2,373 @ $72.23$171K−2.5% of holdingnot yet — horizon still opennot yet — horizon still open91,627Form 4 · filed 2 days after the trade
2026-01-07MacLean Michael FdirectorSale1,974 @ $72.23$143K−3.0% of holdingnot yet — horizon still opennot yet — horizon still open63,832Form 4 · filed 2 days after the trade
2026-01-07McCarthy TeresaofficerSale1,965 @ $72.23$142K−1.7% of holdingnot yet — horizon still opennot yet — horizon still open116,867Form 4 · filed 2 days after the trade
2025-10-22Hughes Steven GeorgeofficerSale2,209 @ $47.54$105K−5.4% of holdingnot yet — horizon still opennot yet — horizon still open38,867Form 4 · filed 2 days after the trade
2025-10-15McCarthy TeresaofficerSale20,000 @ $50.15$1.0M−17.1% of holdingnot yet — horizon still opennot yet — horizon still open97,130Form 4 · filed 2 days after the trade
2025-10-03Mosbrooker EricofficerSale6,562 @ $45.38$298K−10.7% of holdingnot yet — horizon still opennot yet — horizon still open55,000Form 4 · filed 4 days after the trade
2025-09-22Hughes Steven GeorgeofficerSale2,208 @ $40.58$90K−5.4% of holdingnot yet — horizon still opennot yet — horizon still open38,867Form 4 · filed 1 day after the trade
2025-09-15McCarthy TeresaofficerSale15,000 @ $41.41$621K−13.4% of holdingnot yet — horizon still opennot yet — horizon still open97,130Form 4 · filed 2 days after the trade
2025-09-15Hughes Steven GeorgeofficerSale1,542 @ $45.41$70K−3.8% of holdingnot yet — horizon still opennot yet — horizon still open38,867Form 4 · filed 2 days after the trade
2025-09-11Flanagan W. MichaeldirectorSale20,000 @ $38.94$779K−20.0% of holdingnot yet — horizon still opennot yet — horizon still open80,195Form 4 · filed 1 day after the trade
2025-09-05Boyce SarahdirectorSale50,000 @ $49.95$2.5M−14.1% of holdingnot yet — horizon still opennot yet — horizon still open305,871Form 4 · filed same day
2025-09-05WILSON TROY EDWARDdirectorSale15,000 @ $50.00$750K−21.6% of holdingnot yet — horizon still opennot yet — horizon still open54,425Form 4 · filed 4 days after the trade
2025-09-05WILSON TROY EDWARDdirectorSale14,500 @ $50.00$725K−17.3% of holdingnot yet — horizon still opennot yet — horizon still open69,425Form 4 · filed 4 days after the trade
2025-09-03Mosbrooker EricofficerSale6,563 @ $47.07$309K−10.7% of holdingnot yet — horizon still opennot yet — horizon still open55,000Form 4 · filed 2 days after the trade
2025-09-02Gallagher Kathleen P.directorSale188 @ $47.42$9K−0.4% of holdingnot yet — horizon still opennot yet — horizon still open50,204Form 4 · filed same day
2025-08-28Boyce SarahdirectorSale25,000 @ $49.39$1.2M−7.6% of holdingnot yet — horizon still opennot yet — horizon still open305,871Form 4 · filed 1 day after the trade
2025-08-22Hughes Steven GeorgeofficerSale2,208 @ $46.40$102K−5.4% of holdingnot yet — horizon still opennot yet — horizon still open38,867Form 4 · filed same day
2025-08-15McCarthy TeresaofficerSale10,000 @ $46.56$466K−9.3% of holdingnot yet — horizon still opennot yet — horizon still open97,130Form 4 · filed same day
2025-08-13Hughes Steven GeorgeofficerSale1,542 @ $46.66$72K−3.8% of holdingnot yet — horizon still opennot yet — horizon still open38,867Form 4 · filed 2 days after the trade
2025-08-06Mosbrooker EricofficerSale124,687 @ $44.06$5.5M−67.1% of holdingnot yet — horizon still opennot yet — horizon still open61,120Form 4 · filed 2 days after the trade
2025-08-06LEVIN ARTHUR AdirectorSale107,500 @ $47.62$5.1M−84.5% of holdingnot yet — horizon still opennot yet — horizon still open19,650Form 4 · filed 2 days after the trade
2025-08-06Hughes Steven GeorgeofficerSale33,983 @ $42.74$1.5M−46.6% of holdingnot yet — horizon still opennot yet — horizon still open38,867Form 4 · filed 2 days after the trade
2025-08-06MacLean Michael FdirectorSale30,914 @ $42.73$1.3M−32.0% of holdingnot yet — horizon still opennot yet — horizon still open65,806Form 4 · filed 9 days after the trade
2025-08-06WILSON TROY EDWARDdirectorSale22,000 @ $45.00$990K−24.1% of holdingnot yet — horizon still opennot yet — horizon still open69,425Form 4 · filed 2 days after the trade
2025-08-06WILSON TROY EDWARDdirectorSale17,777 @ $45.00$800K−50.0% of holdingnot yet — horizon still opennot yet — horizon still open17,776Form 4 · filed 2 days after the trade
2025-08-06Hughes Steven GeorgeofficerSale17,667 @ $42.74$755K−19.5% of holdingnot yet — horizon still opennot yet — horizon still open72,850Form 4 · filed 2 days after the trade
2025-08-06WILSON TROY EDWARDdirectorSale15,000 @ $45.00$675K−5.0% of holdingnot yet — horizon still opennot yet — horizon still open285,000Form 4 · filed 2 days after the trade
2025-08-06Hughes Steven GeorgeofficerSale12,334 @ $42.74$527K−14.5% of holdingnot yet — horizon still opennot yet — horizon still open72,850Form 4 · filed 2 days after the trade
2025-08-06Hughes Steven GeorgeofficerSale11,283 @ $42.74$482K−13.4% of holdingnot yet — horizon still opennot yet — horizon still open72,850Form 4 · filed 2 days after the trade
2025-08-06WILSON TROY EDWARDdirectorSale7,500 @ $45.00$338K−9.7% of holdingnot yet — horizon still opennot yet — horizon still open69,425Form 4 · filed 2 days after the trade
2025-08-06Mosbrooker EricofficerSale6,120 @ $44.06$270K−10.0% of holdingnot yet — horizon still opennot yet — horizon still open55,000Form 4 · filed 2 days after the trade
2025-08-06Hughes Steven GeorgeofficerSale6,167 @ $42.74$264K−7.8% of holdingnot yet — horizon still opennot yet — horizon still open72,850Form 4 · filed 2 days after the trade
2025-08-04Moriarty John BofficerSale2,245 @ $36.21$81K−4.5% of holdingnot yet — horizon still opennot yet — horizon still open47,755Form 4 · filed 1 day after the trade
2025-06-17Gallagher Kathleen P.directorSale911 @ $30.24$28K−1.8% of holdingnot yet — horizon still opennot yet — horizon still open50,392Form 4 · filed 1 day after the trade
2025-06-11Flanagan W. MichaeldirectorSale20,000 @ $32.88$658K−20.0% of holdingnot yet — horizon still opennot yet — horizon still open80,195Form 4 · filed 1 day after the trade
2025-06-02Gallagher Kathleen P.directorSale5,875 @ $32.48$191K−10.4% of holdingnot yet — horizon still opennot yet — horizon still open50,554Form 4 · filed 2 days after the trade
2025-05-01Gallagher Kathleen P.directorSale5,875 @ $32.40$190K−10.4% of holdingnot yet — horizon still opennot yet — horizon still open50,554Form 4 · filed 1 day after the trade
2025-04-01Gallagher Kathleen P.directorSale5,546 @ $27.83$154K−9.9% of holdingnot yet — horizon still opennot yet — horizon still open50,554Form 4 · filed 2 days after the trade
2025-04-01Gallagher Kathleen P.directorSale329 @ $27.83$9K−0.6% of holdingnot yet — horizon still opennot yet — horizon still open50,554Form 4 · filed 2 days after the trade
2025-03-20Boyce SarahdirectorSale31,540 @ $31.06$980K−9.3% of holdingnot yet — horizon still opennot yet — horizon still open305,871Form 4 · filed 1 day after the trade
2025-03-20Flanagan W. MichaeldirectorSale11,780 @ $31.06$366K−12.8% of holdingnot yet — horizon still opennot yet — horizon still open80,195Form 4 · filed 1 day after the trade
2025-03-20Hughes Steven GeorgeofficerSale9,578 @ $31.06$297K−11.6% of holdingnot yet — horizon still opennot yet — horizon still open72,850Form 4 · filed 1 day after the trade
2025-03-20MacLean Michael FdirectorSale7,935 @ $31.06$246K−7.6% of holdingnot yet — horizon still opennot yet — horizon still open96,720Form 4 · filed 1 day after the trade
2025-03-20McCarthy TeresaofficerSale7,778 @ $31.06$242K−7.4% of holdingnot yet — horizon still opennot yet — horizon still open97,130Form 4 · filed 1 day after the trade
2025-03-11Flanagan W. MichaeldirectorSale20,000 @ $30.13$603K−17.9% of holdingnot yet — horizon still opennot yet — horizon still open91,975Form 4 · filed 1 day after the trade

The vs-S&P columns are a labeled look-back on what the stock did after each filing, measured against the index over the same window. Descriptive history, not a claim about the person or a reason to trade.

133 award / exercise / gift records — not counted as purchases

Awards, option exercises, gifts and tax-withholding disposals are shown separately and never counted as open-market purchases or sales — they carry no conviction information.

DatePersonRoleActionSharesOwned afterFiling
2026-04-20Gallagher Kathleen P.directorAward / grant205,000205,000Form 4
2026-04-20Hoyos Rocio MartinofficerAward / grant60,00060,000Form 4
2026-04-20Hughes Steven GeorgeofficerAward / grant30,00073,097Form 4
2026-04-20Hughes Steven GeorgeofficerAward / grant60,00060,000Form 4
2026-04-20Kenney StephanieofficerAward / grant30,00035,460Form 4
2026-04-20Kenney StephanieofficerAward / grant60,00060,000Form 4
2026-04-20Winslow Brendan R.officerAward / grant30,00043,601Form 4
2026-04-20Winslow Brendan R.officerAward / grant60,00060,000Form 4
2026-04-20Younis HusamofficerAward / grant30,00052,657Form 4
2026-04-20Younis HusamofficerAward / grant60,00060,000Form 4
2026-04-20Gallagher Kathleen P.directorAward / grant102,500131,361Form 4
2026-04-20Hoyos Rocio MartinofficerAward / grant30,00046,660Form 4
2026-02-27WILSON TROY EDWARDdirectorAward / grant20,00020,000Form 4
2026-02-27Boyce SarahdirectorAward / grant20,00020,000Form 4
2026-02-27BOESS CARSTENdirectorAward / grant20,00020,000Form 4
2026-02-27Flanagan W. MichaeldirectorAward / grant20,00020,000Form 4
2026-02-27Skerjanec SimonadirectorAward / grant20,00020,000Form 4
2025-12-19LEVIN ARTHUR AdirectorGift1,33018,320Form 4
2025-12-18Boyce SarahdirectorGift29,159291,970Form 4
2025-12-17Mosbrooker EricofficerWithheld for tax36,56490,436Form 4
2025-12-17Gallagher Kathleen P.directorWithheld for tax33,33688,868Form 4
2025-12-17Moriarty John BofficerWithheld for tax26,82476,931Form 4
2025-12-17McCarthy TeresaofficerWithheld for tax17,298118,832Form 4
2025-12-17Boyce SarahdirectorWithheld for tax15,742321,129Form 4
2025-12-17Flanagan W. MichaeldirectorWithheld for tax13,69594,000Form 4
2025-12-17Mosbrooker EricofficerWithheld for tax11,42679,010Form 4
2025-12-17Calderaro Charles IIIofficerWithheld for tax9,72653,524Form 4
2025-12-17Gallagher Kathleen P.directorWithheld for tax8,03080,838Form 4
2025-12-17Flanagan W. MichaeldirectorAward / grant27,500107,695Form 4
2025-12-17Boyce SarahdirectorAward / grant31,000336,871Form 4
2025-12-17Calderaro Charles IIIofficerAward / grant23,25063,250Form 4
2025-12-17Gallagher Kathleen P.directorAward / grant72,000122,204Form 4
2025-12-17McCarthy TeresaofficerAward / grant39,000136,130Form 4
2025-12-17Moriarty John BofficerAward / grant56,000103,755Form 4
2025-12-17Mosbrooker EricofficerAward / grant72,000127,000Form 4
2025-10-22Hughes Steven GeorgeofficerOption exercise2,20941,076Form 4
2025-10-22Hughes Steven GeorgeofficerOption exercise2,20968,458Form 4
2025-10-15McCarthy TeresaofficerOption exercise20,000117,130Form 4
2025-10-15McCarthy TeresaofficerOption exercise20,00065,000Form 4
2025-10-03Mosbrooker EricofficerOption exercise6,56261,562Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Across 2012–2021, stocks where a CEO, C-suite officer, or director had recently made an open-market common-stock purchase ran about +28 bp per month above the universe average (n=34,268 stock-weeks). A historical tendency, not a prediction.

Congressional disclosures

No congressional trades disclosed for this company.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.