NASDAQ:UPB | Historical Stock Price | Upstream Bio, Inc.

Complete retained daily price history on its own workbook tab. Split-adjusted close keeps every historical share price on one comparable split basis. Cumulative dividend-reinvested close is the daily close of a rebased total-return index: it starts with one share at the earliest retained close, reinvests every distribution, and normalizes every forward and reverse split exactly once. Admitted exchange opening prices remain a distinct current-session series.

Available history
2024-10-11 to 2026-09-04
Data captured

Stock Price Chart

Blue: Split-adjusted close · Orange: Cumulative dividend-reinvested close

$5.62$8.07$11.58$16.62$23.85$34.232024-10-112026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

View year

Historical Stock Price — 2025

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2025-12-31$27.15$27.15517,800
2025-12-30$27.32$27.32831,500
2025-12-29$28.83$28.83238,300
2025-12-26$29.48$29.48228,000
2025-12-24$30.27$30.27266,500
2025-12-23$29.21$29.21347,200
2025-12-22$30.43$30.43701,400
2025-12-19$29.35$29.351,463,000
2025-12-18$29.86$29.86795,900
2025-12-17$28.33$28.33439,700
2025-12-16$29.32$29.32932,300
2025-12-15$27.20$27.201,173,500
2025-12-12$27.14$27.14305,400
2025-12-11$27.47$27.47661,700
2025-12-10$28.67$28.67342,300
2025-12-09$28.37$28.37403,400
2025-12-08$28.97$28.97345,100
2025-12-05$27.75$27.75399,900
2025-12-04$27.74$27.74568,500
2025-12-03$26.97$26.97497,300
2025-12-02$25.01$25.01839,100
2025-12-01$28.98$28.98418,300
2025-11-28$28.60$28.60145,000
2025-11-26$28.00$28.00509,400
2025-11-25$28.83$28.83683,400
2025-11-24$26.05$26.051,256,800
2025-11-21$25.55$25.55384,500
2025-11-20$24.96$24.96402,300
2025-11-19$24.94$24.94422,200
2025-11-18$25.56$25.56585,000
2025-11-17$25.70$25.70527,500
2025-11-14$24.53$24.53801,800
2025-11-13$23.34$23.34429,900
2025-11-12$23.72$23.72476,600
2025-11-11$23.78$23.78215,000
2025-11-10$23.50$23.50490,500
2025-11-07$22.96$22.96271,700
2025-11-06$23.66$23.66289,400
2025-11-05$23.97$23.97234,600
2025-11-04$25.04$25.04342,700
2025-11-03$25.02$25.02316,700
2025-10-31$25.85$25.85215,100
2025-10-30$25.77$25.77352,900
2025-10-29$24.19$24.19197,900
2025-10-28$24.84$24.84418,000
2025-10-27$23.58$23.58413,900
2025-10-24$21.86$21.86186,200
2025-10-23$21.13$21.13241,400
2025-10-22$22.15$22.15450,400
2025-10-21$22.33$22.33475,300
2025-10-20$23.05$23.05787,800
2025-10-17$20.97$20.97370,900
2025-10-16$22.28$22.28397,400
2025-10-15$21.69$21.69477,900
2025-10-14$19.98$19.98261,700
2025-10-13$20.08$20.08218,200
2025-10-10$19.62$19.62271,800
2025-10-09$19.79$19.79636,400
2025-10-08$18.92$18.92328,400
2025-10-07$18.67$18.67190,100
2025-10-06$18.97$18.97335,300
2025-10-03$18.63$18.63239,500
2025-10-02$18.59$18.59336,900
2025-10-01$18.63$18.63327,800
2025-09-30$18.81$18.81783,000
2025-09-29$17.34$17.34208,400
2025-09-26$17.26$17.26254,300
2025-09-25$16.31$16.31171,300
2025-09-24$16.75$16.75294,700
2025-09-23$16.28$16.28190,400
2025-09-22$16.65$16.65322,100
2025-09-19$16.38$16.382,447,200
2025-09-18$17.27$17.27342,800
2025-09-17$16.02$16.02540,000
2025-09-16$17.35$17.35593,400
2025-09-15$16.79$16.79374,000
2025-09-12$17.57$17.57282,400
2025-09-11$17.92$17.92305,300
2025-09-10$17.80$17.80526,200
2025-09-09$18.24$18.24373,700
2025-09-08$18.73$18.73600,700
2025-09-05$19.97$19.97556,200
2025-09-04$19.68$19.68563,600
2025-09-03$20.00$20.00970,100
2025-09-02$20.26$20.262,191,700
2025-08-29$17.13$17.13305,700
2025-08-28$16.76$16.76444,400
2025-08-27$16.70$16.70254,200
2025-08-26$17.30$17.30356,200
2025-08-25$16.73$16.73215,700
2025-08-22$17.63$17.63289,100
2025-08-21$17.74$17.74421,900
2025-08-20$16.36$16.36378,900
2025-08-19$16.90$16.90507,900
2025-08-18$18.02$18.02394,800
2025-08-15$18.93$18.93424,800
2025-08-14$18.62$18.62525,600
2025-08-13$18.56$18.56557,900
2025-08-12$17.50$17.50290,400
2025-08-11$16.59$16.591,453,400
2025-08-08$16.00$16.00214,800
2025-08-07$15.84$15.84371,700
2025-08-06$16.72$16.72366,700
2025-08-05$15.50$15.50359,600
2025-08-04$15.61$15.61410,300
2025-08-01$15.54$15.54514,100
2025-07-31$15.31$15.31568,000
2025-07-30$15.19$15.19868,500
2025-07-29$13.97$13.97469,200
2025-07-28$14.34$14.34760,500
2025-07-25$13.63$13.63399,300
2025-07-24$13.35$13.35673,900
2025-07-23$11.53$11.531,103,400
2025-07-22$10.75$10.75281,400
2025-07-21$10.64$10.64198,700
2025-07-18$10.72$10.72225,700
2025-07-17$11.04$11.04561,200
2025-07-16$10.92$10.92389,700
2025-07-15$11.14$11.14161,700
2025-07-14$11.73$11.73261,100
2025-07-11$11.48$11.48165,000
2025-07-10$11.84$11.84410,900
2025-07-09$11.70$11.70527,800
2025-07-08$10.90$10.90207,300
2025-07-07$10.98$10.98299,800
2025-07-03$11.20$11.20212,100
2025-07-02$11.13$11.13220,800
2025-07-01$10.79$10.79243,200
2025-06-30$10.98$10.98396,800
2025-06-27$10.93$10.933,039,200
2025-06-26$10.94$10.94271,500
2025-06-25$10.89$10.89276,200
2025-06-24$11.39$11.39506,000
2025-06-23$10.72$10.72526,600
2025-06-20$10.88$10.88813,200
2025-06-18$10.64$10.64605,700
2025-06-17$10.31$10.31527,200
2025-06-16$11.17$11.17264,000
2025-06-13$11.36$11.36221,700
2025-06-12$11.56$11.56305,800
2025-06-11$11.68$11.68645,000
2025-06-10$11.59$11.59248,600
2025-06-09$11.29$11.29272,800
2025-06-06$11.27$11.27207,200
2025-06-05$10.83$10.83201,300
2025-06-04$10.86$10.86213,200
2025-06-03$10.84$10.84390,200
2025-06-02$10.66$10.66933,500
2025-05-30$9.23$9.23495,300
2025-05-29$9.35$9.35368,500
2025-05-28$9.22$9.22402,600
2025-05-27$9.62$9.62660,400
2025-05-23$9.16$9.16284,900
2025-05-22$9.31$9.31384,200
2025-05-21$8.93$8.93282,300
2025-05-20$9.13$9.13398,500
2025-05-19$9.05$9.05385,500
2025-05-16$8.64$8.64318,900
2025-05-15$8.78$8.78237,900
2025-05-14$8.56$8.56356,800
2025-05-13$8.65$8.65321,000
2025-05-12$9.50$9.50174,700
2025-05-09$8.82$8.82324,800
2025-05-08$8.84$8.84218,400
2025-05-07$8.58$8.58253,000
2025-05-06$8.21$8.21907,000
2025-05-05$8.68$8.68491,600
2025-05-02$8.64$8.64484,400
2025-05-01$9.00$9.00267,200
2025-04-30$9.26$9.26189,700
2025-04-29$8.98$8.98216,900
2025-04-28$8.78$8.78291,500
2025-04-25$8.39$8.39232,900
2025-04-24$8.96$8.96227,900
2025-04-23$8.81$8.81397,900
2025-04-22$10.15$10.15324,800
2025-04-21$9.71$9.71507,300
2025-04-17$8.78$8.78315,200
2025-04-16$8.42$8.42289,300
2025-04-15$7.77$7.77245,300
2025-04-14$7.58$7.58186,400
2025-04-11$7.37$7.37303,700
2025-04-10$6.40$6.40314,700
2025-04-09$6.53$6.53626,800
2025-04-08$6.07$6.07394,200
2025-04-07$6.36$6.36325,500
2025-04-04$6.10$6.10212,200
2025-04-03$6.30$6.30234,300
2025-04-02$6.49$6.49203,000
2025-04-01$6.70$6.70290,100
2025-03-31$6.12$6.12279,400
2025-03-28$6.87$6.87138,100
2025-03-27$6.81$6.81340,100
2025-03-26$6.84$6.84424,900
2025-03-25$7.63$7.63118,100
2025-03-24$7.70$7.70126,500
2025-03-21$7.62$7.62742,300
2025-03-20$8.05$8.05267,100
2025-03-19$8.55$8.5586,800
2025-03-18$9.04$9.04136,000
2025-03-17$9.87$9.87136,800
2025-03-14$9.61$9.61134,400
2025-03-13$9.06$9.06238,600
2025-03-12$9.23$9.23252,500
2025-03-11$8.56$8.56209,800
2025-03-10$8.39$8.39157,600
2025-03-07$8.94$8.94337,500
2025-03-06$8.42$8.42278,700
2025-03-05$8.47$8.47273,300
2025-03-04$8.34$8.34211,500
2025-03-03$7.46$7.46252,700
2025-02-28$7.93$7.93192,900
2025-02-27$7.81$7.81237,900
2025-02-26$7.66$7.66235,100
2025-02-25$7.73$7.73352,400
2025-02-24$8.22$8.22287,300
2025-02-21$7.98$7.98139,000
2025-02-20$8.23$8.23117,100
2025-02-19$7.92$7.92145,300
2025-02-18$8.40$8.40224,500
2025-02-14$7.60$7.60118,200
2025-02-13$7.33$7.33152,700
2025-02-12$7.16$7.16337,900
2025-02-11$7.09$7.09322,700
2025-02-10$7.34$7.34301,200
2025-02-07$7.92$7.92427,200
2025-02-06$8.53$8.53354,200
2025-02-05$9.02$9.02336,700
2025-02-04$8.87$8.87447,100
2025-02-03$9.93$9.93167,600
2025-01-31$10.77$10.77272,600
2025-01-30$11.00$11.00190,200
2025-01-29$10.25$10.25148,200
2025-01-28$9.85$9.85156,100
2025-01-27$9.92$9.92345,100
2025-01-24$10.39$10.39206,400
2025-01-23$10.77$10.77176,900
2025-01-22$10.77$10.77415,900
2025-01-21$10.81$10.81312,200
2025-01-17$11.00$11.00158,700
2025-01-16$10.88$10.88300,600
2025-01-15$12.00$12.00186,500
2025-01-14$11.21$11.21398,800
2025-01-13$11.43$11.43204,700
2025-01-10$13.70$13.70559,600
2025-01-08$16.19$16.19122,600
2025-01-07$16.17$16.17152,600
2025-01-06$16.98$16.98250,200
2025-01-03$18.35$18.35271,400
2025-01-02$16.30$16.30171,600