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ANAB
NASDAQ Life Sciences

AnaptysBio Slides 8% as Delaware Hearing Opens in GSK/Tesaro Contract Fight

Tom Rudovsky · Reported by Seeking Alpha
More coverage: Biotech Stocks · Healthcare
Sentiment info
Negative
Importance info
7
Price
$45
Mkt Cap
$1.345B
52W Low
$20.177
52W High
$72.36
52W Position info
123% above low
Off High info
38% below high
Rel. Volume info
1.9× avg
Market data snapshot near publication time

ANAB has more than doubled off its 52-week low of $20.177 on elevated volume (1.9× avg).

Summary

AnaptysBio shares dropped 8% as a hearing began at 1:30pm in Delaware Chancery Court over its contract breach litigation with GSK and its Tesaro unit. AnaptysBio sued last November, alleging Tesaro, under GSK's influence, violated the 2014 exclusive collaboration agreement; GSK countersued, claiming AnaptysBio breached the deal by threatening to revoke Tesaro's Jemperli license. Hundreds of millions of dollars in milestone and royalty payments to AnaptysBio hinge on the outcome. This follows the 8-K from July 30 that laid out the post-trial briefing schedule, so the case is now at the argument stage rather than a ruling. GSK is the counterparty but the financial exposure is one-sided against AnaptysBio's much smaller revenue base, making this the dominant near-term risk for ANAB.

At the time of this announcement, ANAB was trading at $45.00 on NASDAQ in the Life Sciences sector, with a market capitalization of approximately $1.3B. The 52-week trading range was $20.18 to $72.36. This news item was assessed with negative market sentiment and an importance score of 7 out of 10. Source: Seeking Alpha.


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ANAB - Latest Insights

ANAB
Oct 19, 2026, 2:18 PM EDT
Source: GlobeNewswire
Importance Score:
8
Price at Filing: $49.23
Real-time Price: $44.60 info
Change: -$4.63 (-9%) info
Market Cap: $1.358B info
ANAB
Sep 28, 2026, 7:00 AM EDT
Source: Wiseek News
Importance Score:
8
Price at Filing: $50.85
Real-time Price: $44.60 info
Change: -$6.25 (-12%) info
Market Cap: $1.358B info
ANAB
Sep 21, 2026, 4:23 PM EDT
Filing Type: 10-KT
Importance Score:
8
Price at Filing: $55.99
Real-time Price: $44.60 info
Change: -$11.39 (-20%) info
Market Cap: $1.358B info
ANAB
Sep 21, 2026, 4:20 PM EDT
Filing Type: 8-K
Importance Score:
7
Price at Filing: $55.99
Real-time Price: $44.60 info
Change: -$11.39 (-20%) info
Market Cap: $1.358B info
ANAB
Sep 21, 2026, 4:15 PM EDT
Source: GlobeNewswire
Importance Score:
8
Price at Filing: $55.99
Real-time Price: $44.60 info
Change: -$11.39 (-20%) info
Market Cap: $1.358B info