Which S&P500 stocks are showing activity after the closing bell on Wednesday?

By Mill Chart - Last update: Jan 7, 2026

The US market session of Wednesday is over, let's have a look at the top S&P500 gainers and losers in the after hours session today.


postmarket

After hours gainers

TickerChangeComment
PODD11.2%INSULET CORP's (NASDAQ:PODD) stock price is advancing with 11.2% to a price of $332.67. Two days ago the company had a press release: Insulet Redefines Diabetes at CES with "Liveable Technology" — A New Frontier in Human-Centered Connected Health.
LHX9.73%Impressive after-hours gains for L3HARRIS TECHNOLOGIES INC (NYSE:LHX) as its stock price advanced 9.73% to $339.89 during Wednesday's after-hours session. In the last year the share price increased with 48.72%.
LMT7.37%Notable gains for LOCKHEED MARTIN CORP (NYSE:LMT) in the after-hours session, with a 7.37% rise to $533.5 during Wednesday.
NOC5.2%Impressive after-hours gains for NORTHROP GRUMMAN CORP (NYSE:NOC) as its stock price advanced 5.2% to $607.0 during Wednesday's after-hours session. The stock is trading 25.8% higher than a year ago.
GD4.18%Positive market activity for GENERAL DYNAMICS CORP (NYSE:GD) after regular trading hours, with a 4.18% increase to $360.1 in the after-hours session on Wednesday. Shareholders saw the stock price going 33.26% higher is the past year.
RTX2.84%RTX CORP's (NYSE:RTX) stock price is advancing with 2.84% to a price of $191.01. In the last 6 months the stock gained 26.46%.
STZ2.68%CONSTELLATION BRANDS INC-A's (NYSE:STZ) stock price increased by 2.68% to $144.25. CONSTELLATION BRANDS INC-A released earnings Yesterday. In the last year the stock lost 22.73%.
PLTR2.24%After the regular session, PALANTIR TECHNOLOGIES INC-A (NASDAQ:PLTR) continues to impress in the after-hours session, with a 2.24% increase to $185.75. In the last 6 months the share price increased with 27.85%.
HSY2.18%HERSHEY CO/THE's (NYSE:HSY) stock price is advancing with 2.18% to a price of $184.0.
COST2.11%COSTCO WHOLESALE CORP's (NASDAQ:COST) shares rose 2.11% to $901.22.

To see the full list of after hours gainers you can use our after hours gainers page.

CONSTELLATION BRANDS INC-A

NYSE:STZ (2/26/2026, 1:33:06 PM)

155.015

-0.11 (-0.07%)


HERSHEY CO/THE

NYSE:HSY (2/26/2026, 1:32:52 PM)

231.53

+1.89 (+0.82%)


INSULET CORP

NASDAQ:PODD (2/26/2026, 1:32:45 PM)

250.19

+2.07 (+0.83%)


GENERAL DYNAMICS CORP

NYSE:GD (2/26/2026, 1:33:08 PM)

349.085

+5.94 (+1.73%)


LOCKHEED MARTIN CORP

NYSE:LMT (2/26/2026, 1:32:52 PM)

643.38

-4.12 (-0.64%)


NORTHROP GRUMMAN CORP

NYSE:NOC (2/26/2026, 1:33:03 PM)

713.13

+9.48 (+1.35%)


COSTCO WHOLESALE CORP

NASDAQ:COST (2/26/2026, 1:32:43 PM)

985.09

-9.67 (-0.97%)


L3HARRIS TECHNOLOGIES INC

NYSE:LHX (2/26/2026, 1:33:05 PM)

354.03

+12.98 (+3.81%)


RTX CORP

NYSE:RTX (2/26/2026, 1:32:56 PM)

198

+2.02 (+1.03%)


PALANTIR TECHNOLOGIES INC-A

NASDAQ:PLTR (2/26/2026, 1:33:09 PM)

133.905

-0.28 (-0.21%)



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