UPB up 16.3% on Sep 8 2026 with no filing that explains it
UPB+16.3%on Tue Sep 8 2026
Upstream Bio, Inc. Common Stock was up 16.3% on the day at $6.99, ranked #3 on 10.8× its usual five-minute volume, when TapeRank recorded this unexplained move at 05:05 ET during the pre-market session.
WHAT THE ROW LOOKED LIKE
LAST6.99
DAY▲ 16.3%
5 MIN▲ 5.91%
5M RVOL10.8×
5M $VOL$12K
FLOAT*54.8M
RANK#3
SESSIONPRE-MARKET
* FLOAT IS SHARES OUTSTANDING; TRUE FREE FLOAT IS NOT AVAILABLE
AI VERDICT
UNEXPLAINEDNO FILINGS · RULE
UPB is up 6.8% on the day on 45.1x its normal volume for this time of day. No filings or headlines were found in SEC EDGAR filings in the last 24 hours, so this is order flow rather than a disclosed catalyst.
WHYNo filings or headlines within 24 hours of the move.
ANALYZED 04:49 ET · 15 MIN AGO · RULE, NO MODEL
FILINGS · 24H BEFORE THE MOVE
No SEC filings in the 24 hours before this was recorded. A move on an unfiled press release shows nothing here, which is what UNEXPLAINED means.
SESSION LEVELS AT CAPTURE
VWAP6.49
HOD6.76
LOD6.14
OR HIGH—
OR LOW—
PREV CLOSE6.01
PM HIGH6.76
PM LOW6.14
GAP▲ 12.31% (indicated)
— MEANS THE LEVEL DID NOT EXIST YET AT THAT INSTANT, NOT ZERO