{"cik":"0002093101","entityType":"operating","sic":"2834","sicDescription":"Pharmaceutical Preparations","ownerOrg":"03 Life Sciences","insiderTransactionForOwnerExists":0,"insiderTransactionForIssuerExists":1,"name":"Atrium Therapeutics, Inc.","tickers":["RNA"],"exchanges":["Nasdaq"],"ein":"000000000","lei":null,"description":"","website":"","investorWebsite":"","category":"<br>Emerging growth company","fiscalYearEnd":"1231","stateOfIncorporation":"DE","stateOfIncorporationDescription":"DE","addresses":{"mailing":{"street1":"3020 CALLAN ROAD","street2":null,"city":"SAN DIEGO","stateOrCountry":"CA","zipCode":"92121","stateOrCountryDescription":"CA","isForeignLocation":0,"foreignStateTerritory":null,"country":null,"countryCode":null},"business":{"street1":"3020 CALLAN ROAD","street2":null,"city":"SAN DIEGO","stateOrCountry":"CA","zipCode":"92121","stateOrCountryDescription":"CA","isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null}},"phone":"858-401-7900","flags":"","formerNames":[],"filings":{"recent":{"accessionNumber":["0001193125-26-303393","0001346824-26-000145","0001193125-26-224243","0001193125-26-224238","0002012383-26-001673","0001193125-26-170964","0001193125-26-170963","0001193125-26-170960","0001193125-26-170914","0001193125-26-170907","0001193125-26-170906","0001193125-26-161513","0000080255-26-000316","0001193125-26-085922","0001193125-26-085921","0001193125-26-085920","0001193125-26-085919","0001193125-26-085918","0001193125-26-083227","0001193125-26-077934","0001193125-26-077907","0001193125-26-077801","0001193125-26-077764","0001193125-26-077763","0001193125-26-077740","0001193125-26-077739","0001193125-26-077733","0001193125-26-077728","0001193125-26-077718","0001193125-26-077716","0001193125-26-077105","0001193125-26-075072","9999999997-26-000345","0001354457-26-000219","0001193125-26-055010","0001193125-26-029976","0001193125-25-314415"],"filingDate":["2026-07-14","2026-05-15","2026-05-14","2026-05-14","2026-04-27","2026-04-22","2026-04-22","2026-04-22","2026-04-22","2026-04-22","2026-04-22","2026-04-17","2026-04-08","2026-03-02","2026-03-02","2026-03-02","2026-03-02","2026-03-02","2026-02-27","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-17","2026-01-30","2025-12-10"],"reportDate":["2026-07-14","","2026-03-31","2026-05-14","","2026-04-20","2026-04-20","2026-04-20","2026-04-20","2026-04-20","2026-04-20","","","2026-02-27","2026-02-27","2026-02-27","2026-02-27","2026-02-27","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","2026-02-26","","","","","",""],"acceptanceDateTime":["2026-07-14T21:14:28.000Z","2026-05-15T20:32:28.000Z","2026-05-14T20:51:31.000Z","2026-05-14T20:50:07.000Z","2026-04-27T20:12:23.000Z","2026-04-22T21:54:12.000Z","2026-04-22T21:54:06.000Z","2026-04-22T21:53:36.000Z","2026-04-22T21:43:12.000Z","2026-04-22T21:41:09.000Z","2026-04-22T21:40:29.000Z","2026-04-17T20:05:34.000Z","2026-04-08T19:25:24.000Z","2026-03-02T23:00:08.000Z","2026-03-02T23:00:07.000Z","2026-03-02T23:00:05.000Z","2026-03-02T23:00:04.000Z","2026-03-02T23:00:02.000Z","2026-02-27T22:22:28.000Z","2026-02-26T23:21:53.000Z","2026-02-26T23:20:25.000Z","2026-02-26T23:16:39.000Z","2026-02-26T23:16:28.000Z","2026-02-26T23:16:15.000Z","2026-02-26T23:13:09.000Z","2026-02-26T23:13:06.000Z","2026-02-26T23:11:31.000Z","2026-02-26T23:10:49.000Z","2026-02-26T23:06:48.000Z","2026-02-26T23:05:46.000Z","2026-02-26T21:50:04.000Z","2026-02-26T18:01:03.000Z","2026-02-26T18:00:11.000Z","2026-02-26T15:49:39.000Z","2026-02-17T22:00:53.000Z","2026-01-30T02:41:28.000Z","2025-12-10T22:15:25.000Z"],"act":["34","34","34","34","34","","","","","","","33","34","","","","","","34","","","","","","","","","","","","34","33","","34","34","34","34"],"form":["8-K","SCHEDULE 13G","10-Q","8-K","SCHEDULE 13G","4","4","4","4","4","4","S-8","SCHEDULE 13G","4","4","4","4","4","8-K","3","3","3","3","3","3","3","3","3","3","3","8-K","S-8","SEC STAFF ACTION","CERT","10-12B/A","10-12B/A","10-12B"],"fileNumber":["001-43008","005-95606","001-43008","001-43008","005-95606","","","","","","","333-295136","005-95606","","","","","","001-43008","","","","","","","","","","","","001-43008","333-293782","","001-43008","001-43008","001-43008","001-43008"],"filmNumber":["261175022","26988626","26980021","26979999","26901038","","","","","","","26871530","26847843","","","","","","26701936","","","","","","","","","","","","26690044","26684452","","26682764","26643241","26580239","251562773"],"items":["8.01,9.01","","","2.02,9.01","","","","","","","","","","","","","","","1.01,5.01,5.02,9.01","","","","","","","","","","","","7.01,9.01","","","","","",""],"core_type":["XBRL","SCHEDULE 13G","XBRL","XBRL","SCHEDULE 13G","4","4","4","4","4","4","S-8","SCHEDULE 13G","4","4","4","4","4","XBRL","3","3","3","3","3","3","3","3","3","3","3","XBRL","S-8","ORDER","CERT","10-12B/A","10-12B/A","10-12B"],"size":[164592,18393,5906905,225728,10907,7611,7596,7553,7652,7570,7561,372367,7557,5388,5392,5390,5402,5398,909934,20033,19423,19141,18498,19102,18624,19918,18902,19120,19186,19172,3302432,519203,4161,591686,6596871,5658203,3280709],"isXBRL":[1,0,1,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0],"isInlineXBRL":[1,0,1,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0],"isXBRLNumeric":[0,0,1,0,0,0,0,0,0,0,0,0,0,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"primaryDocument":["d132402d8k.htm","xslSCHEDULE_13G_X02/primary_doc.xml","rna-20260331.htm","d82207d8k.htm","xslSCHEDULE_13G_X02/primary_doc.xml","xslF345X06/ownership.xml","xslF345X06/ownership.xml","xslF345X06/ownership.xml","xslF345X06/ownership.xml","xslF345X06/ownership.xml","xslF345X06/ownership.xml","d106210ds8.htm","xslSCHEDULE_13G_X02/primary_doc.xml","xslF345X05/ownership.xml","xslF345X05/ownership.xml","xslF345X05/ownership.xml","xslF345X05/ownership.xml","xslF345X05/ownership.xml","d87849d8k.htm","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","d14901d8k.htm","d106332ds8.htm","filename1.pdf","RNA_Form10_Cert_2093101.pdf","d42675d1012ba.htm","d42675d1012ba.htm","d42675d1012b.htm"],"primaryDocDescription":["8-K","","10-Q","8-K","","4","4","4","4","4","4","S-8","","4","4","4","4","4","8-K","3","3","3","3","3","3","3","3","3","3","3","8-K","S-8","","","10-12B/A","10-12B/A","10-12B"]},"files":[]}}