$TSM support and resistance levels, and what followed

TSMC - 2026-10-17 weekend research daily chart

Each note as it was published, with the price that followed. We publish where price sits against its own levels, not where it is going, so nothing here is scored as right or wrong. Educational commentary, not investment advice.

8 notes, newest first, back to Thu, 15 Oct 2026.

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Sat, 17 Oct 2026

412.61 October 16 completed regular close; 2026-10-17 weekend research edition

Below the 50-day average and above the 200-day average at the October 16 regular close.

After	Close	vs Sat, 17 Oct 2026 close	vs published price
1 session	420.22	—	+1.84%
5 sessions	418.51	—	+1.43%

20-session SMA through October 16 452.469 — published below, latest close below
50-session SMA through October 16 434.364 — published below, latest close below
200-session SMA through October 16 395.047 — published above, latest close above
October 15 intraday low 407.13 — published above, latest close above
2026-10-15 remaining downward daily gap 423.66 — published below, latest close below

Sat, 17 Oct 2026

412.61 October 16 regular close as separate stock-price context

Reported Q3 results; margin comparisons describe different business models, not a quality winner.

After	Close	vs Sat, 17 Oct 2026 close	vs published price
1 session	420.22	—	+1.84%
5 sessions	418.51	—	+1.43%

Sat, 17 Oct 2026

412.61 October 16 regular close as separate stock-price context

Forward-looking capacity and Q4 guidance, with working-capital context.

After	Close	vs Sat, 17 Oct 2026 close	vs published price
1 session	420.22	—	+1.84%
5 sessions	418.51	—	+1.43%

Thu, 15 Oct 2026

418.02 October 15 premarket observation 2026-10-15T08:35:09-04:00

TSM: October 14 regular close $430.00; October 15 observed premarket $418.02 (-2.79%).

After	Close	vs Thu, 15 Oct 2026 close	vs published price
1 session	412.61	-2.28%	-1.29%
5 sessions	412.35	-2.34%	-1.36%

This note was marked to a October 15 premarket observation 2026-10-15T08:35:09-04:00, not a close. The like-for-like column is the one measured from the Thu, 15 Oct 2026 close.

Sep 17 daily gap 419.85 — published below, latest close below
Sep 15 low 412.55 — published above, latest close above
Aug 6 low 407.99 — published above, latest close above
Oct 14 low 428.06 — published below, latest close below
20-session SMA through October 14 453.973 — published below, latest close below
50-session SMA through October 14 434.311 — published below, latest close below
200-session SMA through October 14 393.875 — published above, latest close above

Thu, 15 Oct 2026

418.21 October 15 regular-session observation — research edition

TSM: $418.21 (-2.74% versus October 14 close). Research edition with dated reference levels.

After	Close	vs Thu, 15 Oct 2026 close	vs published price
1 session	412.61	—	-1.34%
5 sessions	412.35	—	-1.40%

This note was marked to a October 15 regular-session observation — research edition, not a close. The like-for-like column is the one measured from the Thu, 15 Oct 2026 close.

20-session SMA through October 14 453.973 — published below, latest close below
50-session SMA through October 14 434.311 — published below, latest close below
200-session SMA through October 14 393.875 — published above, latest close above
Sep 17 gap / prior 419.85 — published below, latest close below
Oct 14 low / reclaim 428.06 — published below, latest close below
Sep 15 low 412.55 — published above, latest close above
Oct 15 observed low 407.13 — published above, latest close above

Thu, 15 Oct 2026

430.00 October 14 regular close

TSM: closing decline -21.55%; separate rebound from the trough to October 14 +14.77%.

After	Close	vs Thu, 15 Oct 2026 close	vs published price
1 session	412.61	—	-4.04%
5 sessions	412.35	—	-4.10%

Closing peak 2026-06-30 477.57 — published below, latest close below
Later closing trough 2026-07-29 374.67 — published above, latest close above
October 14 regular close 430.00 — published below, latest close below

Thu, 15 Oct 2026

422.40 October 15 completed regular close — After Close edition

Taiwan Semiconductor Manufacturing closed at $422.40 (-1.77% versus October 14). The closing chart compares the retained morning setup with the completed session and dated daily references.

After	Close	vs Thu, 15 Oct 2026 close	vs published price
1 session	412.61	—	-2.32%
5 sessions	412.35	—	-2.38%

20-session SMA 453.58 — published below, latest close below
50-session SMA 434.48 — published below, latest close below
200-session SMA 394.48 — published above, latest close above
Sep 17 gap / crossed 419.85 — published above, latest close belowcrossed
Sep 15 low 412.55 — published above, latest close above
Aug 6 low 407.99 — published above, latest close above
Oct 15 gap remains 423.66 — published below, latest close below

Thu, 15 Oct 2026

422.40 October 15 completed regular close; financial card shows Q3 results and Q4 guidance

TSMC reported Q3 USD revenue of $46.72bn; Q4 company revenue guidance is $52.30–$54.30bn, a forecast range.

After	Close	vs Thu, 15 Oct 2026 close	vs published price
1 session	412.61	—	-2.32%
5 sessions	412.35	—	-2.38%

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