Today's pre-market stock movers: TWTR, QCOM, BAC, BK and more

• $Natus Medical (NTUS.US)$ +28.6% (to be acquired by ArchiMed Group for $33.50/share in cash)

• $Middlefield Banc (MBCN.US)$ +6.1% (Ancora Issues Open Letter to Middlefield Banc Corp. Shareholders)

• $Sinclair Broadcast Group (SBGI.US)$ +5% (Sinclair Broadcast and Charter Communications (CHTR.) reach a comprehensive distribution agreement)

• $Castle Biosciences (CSTL.US)$ +4.1% (announces a recent poster presentation highlighting data and concluding that its non-invasive skin scraping technique produces sufficient ribonucleic acid to assess reproducible gene expression for its inflammatory skin disease pipeline test)

• $Twitter (Delisted) (TWTR.US)$ +3.9% (adopts limited duration shareholder rights plan, enabling all shareholders to realize full value of company; also Thoma Bravo mulling bid for Twitter)

• $Ocugen (OCGN.US)$ +3.3% (to commercialize COVAXIN in Mexico, rights now encompassing all of North America)

• $Black Diamond Therapeutics (BDTX.US)$ +2.9% (doses first patient in Phase 1 Study of BDTX-1535)

• $East Stone Acquisition Corp (ESSC.US)$ +2.5% (announces business combination with ICONIQ Holding)

• $Bank of New York Mellon (BK.US)$ +2.14% (earnings report)

• $Synchrony Financial (SYF.US)$ +2.1% (earnings report)

• $Bank of America (BAC.US)$ +1.2% (earnings report)

• $Microvast (MVST.US)$ +1.1% (Statement on Status Under Holding Foreign Companies Accountable Act)

• $Gap Inc (GPS.US)$ +1.9% (upgraded to Equal-Weight from Underweight at Morgan Stanley)

• $Biogen (BIIB.US)$ +1.7% (upgraded to Overweight from Equal Weight at Wells Fargo)

• $Comerica (CMA.US)$ +0.9% (upgraded to Neutral from Underperform at Robert Baird)

• $TG Therapeutics (TGTX.US)$ -31.86% (voluntarily withdraws BLA/sNDA for U2 to treat patients with CLL and SLL)

• $Nektar Therapeutics (NKTR.US)$ -23.21% (Nektar Therapeutics and Bristol Myers Squibb decide to end clinical development program for bempegaldesleukin in combination with Opdivo)

• $Avadel Pharmaceuticals (AVDL.US)$ -4.7% (filed a complaint against Jazz Pharmaceuticals)

• $Red Robin (RRGB.US)$ -2.2% (downgraded to Mkt Perform from Outperform at Raymond James)

• $Aptiv PLC (APTV.US)$ -2.1% (downgraded to Underweight from Neutral at Piper Sandler)

• $Sirius XM (SIRI.US)$ -1.9% (downgraded to Underweight from Equal-Weight at Morgan Stanley)

• $SLM Corp (SLM.US)$ -1.4% (downgraded to Equal-Weight from Overweight at Stephens)

• $United Airlines (UAL.US)$ -1.4% (downgraded to Neutral from Buy at UBS)

• $Qualcomm (QCOM.US)$ -1.3% (downgraded to Neutral from Outperform at SMBC Nikko)