Today's After-Hours Stock Movers:

MacroGenics, Inc. (Nasdaq: MGNX) 19.3% HIGHER; announced that the U.S. Food and Drug Administration (FDA) has approved MARGENZA, in combination with chemotherapy, for the treatment of adult patients with metastatic HER2-positive breast cancer who have received two or more prior anti-HER2 regimens, at least one of which was for metastatic disease. MARGENZA is the first product approved from MacroGenics promising pipeline. The approval was based on safety and efficacy results from the pivotal Phase 3 SOPHIA trial.

Selecta Biosciences (NASDAQ: SELB) 9.6% HIGHER; Chief Medical Officer, Peter Traber, bought 40,000 shares on 12/14 at $3.24.

Qutoutiao (NASDAQ: QTT) 8% LOWER; reported Q3 EPS of ($0.07), $0.02 better than the analyst estimate of ($0.09). Revenue for the quarter came in at $166.4 million versus the consensus estimate of $174.9 million.

Progenity (NASDAQ: PROG) 7.5% HIGHER; COO, Damon Silvestry, bought 63,870 shares on 12/15 at $4.07.

ADMA Biologics, Inc. (Nasdaq: ADMA) 6.3% HIGHER; announced that its Board of Directors has approved the adoption of a limited duration stockholder rights plan and declared a dividend distribution of one right for each outstanding share of common stock. The record date for such dividend distribution is December 30, 2020. The rights plan expires, without any further action being required to be taken by ADMAs Board of Directors, on December 15, 2021.

ABM Industries (NYSE: ABM) 4.1% LOWER; reported Q4 EPS of $0.69, $0.01 worse than the analyst estimate of $0.70. Revenue for the quarter came in at $1.48 billion versus the consensus estimate of $1.43 billion. ABM Industries sees Q1 2021 EPS of $0.60-$0.65, versus the consensus of $0.47.

Roku, Inc. (NASDAQ: ROKU) 3.4% HIGHER; Roku and WarnerMedia today announced an agreement to bring HBO Max to the Roku platform. Starting tomorrow, Dec. 17, Roku users will be able to download HBO Max from the Roku channel store and subscribe directly on their Roku device to access all of HBO Max, which includes 10,000 hours of curated premium storytelling from the iconic brands of HBO, Warner Bros., DC, Adult Swim and much more. For users who have already subscribed to HBO through their Roku devices, the HBO app will automatically update to become the HBO Max app, and they will be able to log in using their existing HBO credentials.

Lennar Corp. (NYSE: LEN) 3% HIGHER; reported Q4 EPS of $2.83, $0.46 better than the analyst estimate of $2.37. Revenue for the quarter came in at $6.83 billion versus the consensus estimate of $6.65 billion.

New Residential Investment (NYSE: NRZ) 2.8% HIGHER; declared a quarterly dividend of $0.20 per share, or $0.8 annualized. This is a 33.3% increase from the prior dividend of $0.15.

GSX Techedu Inc. (NYSE: GSX) 1.6% LOWER; downgraded to Neutral at UBS

ElectraMeccanica (NASDAQ: SOLO) 1.2% HIGHER; Stifel initiates coverage with a Buy rating and a price target of $9.00.