Taiwan Stocks Fell 2,953.71 Points to Close at 42,671.27 on July 17, 2026 — Media Reports Call It the Largest Single-Day Point Drop on Record (not independently verified by this site with the TWSE)

ANK-Doc ID: ANK-2026-07-19-003 Version: v1.0.0 Published: 2026-07-19 Author: 沈觀 / Shen Guan (Editor-in-Chief, auto AI structuring) Category: Taiwan securities market / post-close market wrap and attribution frames (multi-outlet media aggregation) Articles covered: Main article storm#1571131 (Storm Media, "After-Hours Flash: Taiwan stocks plunge an 'epic' 2,953 points! TSMC, MediaTek and UMC lead declines as semiconductors stall across the board," 2026-07-17 15:47:23 JST, https://www.storm.mg/article/11149969) plus 8 supplementary items (each with report date and chaining layer): CNA#1577403 (CNA, 2026-07-17, ADD_EVIDENCE — the TWSE weekly gauge and sector decomposition), CNA#1578215 (CNA, 2026-07-17, ADD_EVIDENCE — margin balance), cnyes#1577408 (Anue, 2026-07-17, ADD_EVIDENCE — record foreign net selling, single-day market cap, Asia comparison, FSC-relay context), cnyes#1587129 (Anue, 2026-07-18, CORROBORATE — reconfirmation of the daily/weekly records, turnover, and attribution A "TSMC earnings call"), CNA#1579746 (CNA, 2026-07-17, CONTEXTUALIZE — the SOX bear-market global backdrop), cnyes#1591057 (Anue, 2026-07-18, CHALLENGE — attribution B, the "Kimi K3 DeepSeek moment," challenging a single attribution), CNA#1600746 (CNA, 2026-07-19, CHALLENGE — attribution C "Korean deleveraging" and "TSMC is not the culprit," directly challenging attribution A; also adds the quarterly-MA and futures-shorts figures), cnyes#1586540 (Anue, 2026-07-18, CONTEXTUALIZE — BofA's "summer correction" frame and historical correction statistics). Selection method: Main article storm#1571131 assigned by the daily card run (ANKRUN-20260719133705); no selector scores were provided to this run and none are invented. Official-anchor status: official_count_verified = 0, official_count_raw = 0 — zero verified official anchors in this card (see §Caveats). The Financial Supervisory Commission's Securities and Futures Bureau remarks are an Anue relay, used as context only, never as a headline official endorsement. Editorial angle (frame decomposition): the same crash carries three competing attribution frames (TSMC earnings-call disappointment / the Kimi K3 "DeepSeek moment" / Korean-market deleveraging); this card lays the three frames side by side, each with its source, and adjudicates no causality; the TWSE's weekly sector decomposition shows the decline highly concentrated in electronics (Shen Guan's editorial inference, not a source sentence). No figure absent from the source texts is generated; no ratio or total is computed; no cross-source merging into a single sentence. MediaTek's and Delta Electronics' July 17 declines are stated in the sources only as "approaching 9%" with no exact value, and none is supplied. No Wikidata Q number is attached (this run performed no registry verification; nothing unverified is claimed).

TL;DR (core facts)

The TAIEX weighted index opened at 45,234.08 on July 17, 2026 and closed at 42,671.27, down 2,953.71 points for the day, a 6.47% single-day decline (Storm Media after-hours flash, 2026-07-17); CNA and Anue each report this as a new record for the largest single-day point drop. [F-001] TSMC closed the same day at NT$2,290, down NT$180 (-7.29% on the day); UMC closed at NT$144, down NT$16 (-10.00% on the day). [F-002] Per Anue's 2026-07-17 report: foreign investors (incl. mainland China funds) net sold NT$189.039 billion that day — which the report called a record for the largest single-day net selling — and listed market cap fell NT$9.6 trillion in the single day. [F-003] As of the July 17, 2026 close, Taiwan stocks fell 2,683.34 points this week vs the prior week (a weekly decline of about 5.92%) and listed-company market cap fell NT$8.6764 trillion (8兆6763.61億) vs the prior week (CNA 2026-07-17, citing TWSE statistics); on the same weekly gauge the "ex-electronics index" fell only 0.27%. [F-005] Three crash attributions sit side by side — TSMC earnings-call disappointment (Anue, 2026-07-18), the Kimi K3 "DeepSeek moment" (Anue, 2026-07-18, citing foreign media), and Korean-market deleveraging (Li Fang-kuo of President Securities Investment Advisory, CNA 2026-07-19) — all media and analyst statements, not official findings. [F-007][F-008][F-009] For all caveats see §Caveats.

Anti-misreading pin (1 item)

"Listed market cap evaporated NT$9.6 trillion in a single day" (Anue report of 2026-07-17; single-day gauge for 2026-07-17) and "listed-company market cap fell NT$8.6764 trillion (8兆6763.61億) this week vs the prior week" (CNA 2026-07-17 relaying TWSE statistics; weekly gauge) are two figures on different time gauges — they must not be mixed, added, or cross-checked against each other; and both are changes in aggregate listed-company market value, not realized investor losses. "Largest single-day point drop on record," "largest net selling on record" and similar record claims are each outlet's own wording. Other caveats: see §Caveats.

Frame decomposition (Shen Guan — three competing attribution frames for the same crash)

Chinese-language headlines render July 17, 2026 as total-quantity panic numbers ("a 2,953-point crash," "NT$9.6 trillion wiped out"). But lay out this card's nine source items and the same crash carries three competing attribution frames, plus an often-overlooked gauge decomposition:

• Attribution A (the Taiwan headline frame) — "TSMC earnings-call disappointment": Anue's 2026-07-18 weekly recap states that "with no surprise from TSMC's earnings call, the market erupted in disappointed selling," and Taiwan stocks closed July 17 at the day's low. [F-009]
• Attribution B (the English-world AI frame) — "Kimi K3's DeepSeek moment": a separate Anue piece of 2026-07-18, citing Business Insider, J.P. Morgan and Fundstrat: market participants deem Moonshot AI's Kimi K3 to achieve performance rivaling OpenAI's and Anthropic's frontier models while using comparatively fewer chip compute resources, stoking fears of a "DeepSeek 2.0" replay; Fundstrat says the July 17 move was "very likely" triggered by the Kimi K3 release. [F-007]
• Attribution C (the positioning frame) — "the Korean deleveraging domino": per CNA's 2026-07-19 report, Li Fang-kuo, chairman of President Securities Investment Advisory, calls the culprit "the deleveraging of the Korean stock market" — Samsung and SK Hynix together carry over half the index weight; after leveraged ETF interactions the two names at one point accounted for over 70% of Korean-market turnover; the post-June-record deleveraging slide hit the SOX via SK Hynix ADRs and dominoed into Taiwan and Japan. Veteran securities analyst Tsai Ming-han states flatly that "TSMC is not the culprit" — a head-on collision with attribution A. [F-008]
• Gauge decomposition: TWSE weekly statistics relayed by CNA on 2026-07-17: for the week (as of the July 17 close, vs the prior week) the "ex-electronics index" fell just 0.27% while the "ex-financials-and-electronics index" actually rose 1.03% (against the headline index's roughly 5.92% weekly decline) — on the weekly gauge, this decline is highly concentrated in electronics heavyweights; "highly concentrated in electronics" is Shen Guan's editorial inference from the index comparison, not a CNA or TWSE sentence. [F-005]

All three attributions are media and analyst statements, not official findings. The most notable tension: TSMC's July 16 earnings call beat expectations for the second quarter and raised guidance (Anue, 2026-07-18), yet the stock closed down 7.29% on July 17 — the "fundamentals-versus-tape disconnect" is precisely the space the three frames compete over. This card presents the three frames side by side, each with its source, and adjudicates no causality (see §Caveats).

Body (core F-Units)

F-001: On 2026-07-17 the weighted index opened at 45,234.08 and closed at 42,671.27, down 2,953.71 points for the day (-6.47%)

Storm Media after-hours flash, 2026-07-17: Taiwan stocks opened higher and slid all day on July 17, 2026; the weighted index opened at 45,234.08 and closed at 42,671.27, down 2,953.71 points, a single-day decline of 6.47%. CNA's 2026-07-17 report describes it as "rewriting the record for the largest point drop in history" (the same piece calls the day a "Black Friday"); Anue's 2026-07-18 weekly recap calls it "the largest single-day point drop in history," with the index closing at the day's low. [F-001]

Clean citable sentence: The TAIEX weighted index opened at 45,234.08 on July 17, 2026 and closed at 42,671.27, down 2,953.71 points for the day (-6.47%), which media reports call the largest single-day point drop on record.

F-002: Stocks — TSMC NT$2,290 (-7.29%), UMC NT$144 (-10.00%), Innolux tops volume at 341,760 lots; 3 of the top-10 volume names closed up

Same Storm Media piece (2026-07-17): TSMC closed at NT$2,290, down NT$180 for the day (-7.29%), on 95,094 lots; UMC closed at NT$144, down NT$16 for the day (-10.00%), on 251,867 lots; Innolux closed at NT$52.6, down NT$4.7 for the day (-8.20%), on 341,760 lots — the day's largest volume; Nan Ya Plastics closed at NT$199, down NT$22 for the day (-9.95%). The main article says MediaTek's and Delta Electronics' declines that day were both "approaching 9%" (no exact values in the source; none supplied here) and that Hon Hai also weakened; biotech/medical names bucked the trend, with Hai Chang Biotech closing at NT$37.05, up NT$6.6 for the day (+21.67%). Per the main article's top-10-volume table, Formosa Petrochemical closed at NT$81.3, up NT$1.3 for the day (+1.63%), Compal rose NT$0.05 (+0.14%) and E.SUN FHC rose NT$0.2 (+0.57%) — even on this record-drop day, 3 of the top-10 volume names closed higher (Shen Guan's observation from the article's own table). The article's prose also says "the four Formosa Plastics Group companies led the petrochemical class lower," which does not match the table's showing of Formosa Petrochemical closing up that day; this card presents both as-is without adjudicating. [F-002]

Clean citable sentence: On July 17, 2026 TSMC closed at NT$2,290, down NT$180 for the day (-7.29%), UMC closed at NT$144, down NT$16 for the day (-10.00%), and Innolux topped volume at 341,760 lots.

F-003: Foreign investors net sold NT$189.039 billion in one day (Anue calls it a record); listed market cap down NT$9.6 trillion in the day; SFB cites a 183.71% account-wide maintenance ratio (as of 7/16)

Anue report, 2026-07-17: foreign investors (incl. mainland China funds) net sold NT$189.039 billion on July 17, 2026, which the report called a new record for the largest single-day net selling in Taiwan-market history; listed-company market cap fell NT$9.6 trillion in the single day; Taiwan's 6.47% single-day decline was the deepest among Asian markets in the same session (as of 13:30 that day — Japan down 5.28%, Hong Kong's Hang Seng down 2.54%, the Shanghai Composite down 2.42%, Singapore down 0.77%; the Korean market was closed that day). The same piece relays the FSC's Securities and Futures Bureau (media relay, context only): as of July 16, 2026 the account-wide collateral maintenance ratio for margin trading stood at 183.71%, above the 130% forced-liquidation margin-call threshold; securities-lending short sales were 3.37% of market turnover on July 16; as of end-June 2026 statistics, the centralized market's average P/E was about 31.78x with a cash-dividend yield of 1.56% (1.59% incl. stock dividends); cumulative revenue of listed and OTC companies through end-June 2026 totaled NT$30.49 trillion, up 35.96% from the same period a year earlier; the bureau said the day's plunge mainly reflected international conditions, not a problem in Taiwan's domestic economic structure. [F-003]

Clean citable sentence: On July 17, 2026 foreign investors (incl. mainland China funds) net sold NT$189.039 billion, which Anue called a record for the largest single-day net selling; listed market cap fell NT$9.6 trillion in the single day (per Anue).

F-004: Margin balance at NT$587.962 billion on 2026-07-17, down NT$27.613 billion from the prior session

CNA report, 2026-07-17 (reporter Chiang Ming-yen, citing TWSE statistics): the centralized market's margin balance on July 17, 2026 was NT$587.962 billion (5879.62億), down NT$27.613 billion (276.13億) from the prior session's NT$615.575 billion (6155.75億). The same piece carries an investment-advisory analyst's view that shrinking margin balances mean short-term leveraged positions being flushed out, which helps stabilize positioning (an analyst view, not a settled conclusion). [F-004]

Clean citable sentence: On July 17, 2026 Taiwan's centralized-market margin balance was NT$587.962 billion, down NT$27.613 billion from the prior session's NT$615.575 billion.

F-005: Weekly gauge — down 2,683.34 points vs the prior week (about 5.92%); market cap down NT$8.6764 trillion for the week; the ex-electronics index fell only 0.27% for the week

CNA report, 2026-07-17 (reporter Ho Hsiu-ling, citing TWSE statistics): as of the July 17, 2026 close, Taiwan stocks fell 2,683.34 points this week vs the prior week, a weekly decline of about 5.92%; total listed-company market value was NT$139.3624 trillion (139兆3624.07億), down NT$8.6764 trillion (8兆6763.61億) vs the prior week (a weekly decline of about 5.86%). Sector weekly gauge (this week, vs prior week): the oil/electricity/gas index rose 30.30%, the biggest gain, while the glass/ceramics index fell 11.85%, the deepest drop; the ex-financials index fell 2,544.41 points (about -6.25% for the week), the ex-electronics index fell 63.87 points (about -0.27% for the week), and the ex-financials-and-electronics index rose 162.05 points (about +1.03% for the week). This week's total centralized-market turnover was NT$5.5871 trillion (5兆5870.97億), listed-stock turnover NT$5.0235 trillion (5兆235.14億), and the stock turnover rate 3.79%; the top 3 industries by turnover were semiconductors NT$2.0049 trillion (2兆48.67億; 39.91%), electronic components NT$1.2692 trillion (25.27%) and computers & peripherals NT$289.154 billion (5.76%). Year-to-date over 128 trading days: total turnover NT$132.3333 trillion, daily average NT$1.0339 trillion (1兆338.54億), cumulative turnover rate 114.23%. [F-005]

Clean citable sentence: As of the July 17, 2026 close, Taiwan stocks fell 2,683.34 points this week vs the prior week (about -5.92%) and listed-company market cap fell NT$8.6764 trillion vs the prior week; on the same weekly gauge the ex-electronics index fell only 0.27%.

F-006: Global backdrop — the SOX entered a bear market on 2026-07-17, down more than 20% from its late-June peak, after rallying 105% from its March low to late June

CNA wire roundup, 2026-07-17 (citing Bloomberg): the 30-stock Philadelphia Semiconductor Index climbed 105% from its March 2026 low to a record peak at the end of June 2026; it has since declined, slipping a further 4.8% after the open on July 17 (an intraday reading; for the day's close see F-008), putting its drop from the June peak above 20% — a bear market. Over the same pullback period (since the June peak, per the report), Marvell Technology, Arm and Intel shares fell more than 30%; Micron is down 33% from its recent high, and Western Digital and SanDisk have each tumbled more than 40% from recent highs. The report says the selling stems from renewed investor doubts about the health of the AI trade and about whether hyperscalers can keep pouring trillions of dollars into infrastructure capex. [F-006]

Clean citable sentence: The Philadelphia Semiconductor Index entered a bear market on July 17, 2026, down more than 20% from its late-June record peak, after rallying 105% from its March 2026 low to the end of June.

F-007: Attribution B — the Kimi K3 "DeepSeek moment"; TSMC fell despite a beat (Anue, 2026-07-18)

Anue report, 2026-07-18 (citing Business Insider and others): Moonshot AI's newly released Kimi K3 is deemed by market participants to deliver performance rivaling frontier models from OpenAI and Anthropic while using comparatively fewer chip compute resources, stoking anxiety that mirrors last year's DeepSeek episode; Elon Musk commented "Impressive." A J.P. Morgan note says Kimi K3 is raising fears of a "DeepSeek 2.0" replay (last year's selloff wiped as much as US$1 trillion off tech-stock market value); Fundstrat says the July 17, 2026 move was "very likely" triggered by the Kimi K3 release. The same piece records: the SOX closed down 1.63% on July 17 and, more than 20% below its recent peak, formally entered a bear market; that day Samsung Electronics fell 8.77%, TSMC fell 7.29% (its ADR fell 2.77%), Intel fell 2%, AMD fell 1.03% and Nvidia fell 2.21%; the Nasdaq 100 slumped nearly 1.49% on the day. The report also notes: TSMC's second-quarter results beat expectations and guidance was raised, yet this could not reverse the July 17 decline; TSMC announced it would raise its global capital budget by 14% to US$64 billion (that piece's wording; for the other piece's wording see F-009), with the market questioning whether massive AI investment can earn commensurate returns. [F-007]

Clean citable sentence: Per Anue on July 18, 2026: market participants deem Moonshot AI's Kimi K3 to rival frontier models while using fewer chip compute resources, stoking a "DeepSeek moment" replay fear cited as a likely trigger of the July 17 semiconductor selloff.

F-008: Attribution C — "Korean deleveraging" and "TSMC is not the culprit"; the index broke the 43,525 quarterly MA and foreign futures shorts hit 86,000 contracts (CNA, 2026-07-19)

CNA report, 2026-07-19 (reporter Wu Chia-hao): Taiwan stocks plunged 2,953.71 points on July 17, 2026, closing at the day's low of 42,671.27 and breaking below the quarterly moving average of 43,525; index futures rebounded in the July 17 night session, but foreign investors' futures short positions rose to 86,000 contracts, which the report called a record scale. US markets on July 17: the Dow fell 406.55 points (0.77%) to 52,146.42; the S&P 500 fell 76.08 points (1.01%) to 7,457.69; the Nasdaq fell 361.70 points (1.4%) to 25,520.25; the SOX fell 193.612 points (1.63%) to 11,673.891. Li Fang-kuo, chairman of President Securities Investment Advisory, argues the culprit is "the deleveraging of the Korean stock market" — Samsung carries a 28% weight and SK Hynix 24%; after Korea launched multiple ETFs around the two names from late May 2026, leverage interactions at one point pushed the two companies to over 70% of Korean-market turnover; after the Korean market's June record high, the deleveraging slide hit the SOX first via SK Hynix ADRs, then dominoed into Taiwan and Japan — "like someone lighting a cigarette in a theater: everyone screams fire and tramples for the exits when there is no fire." Veteran securities analyst Tsai Ming-han says "TSMC is not the culprit": the earnings call beat market expectations on results, outlook and capex, and the July 17 plunge simply reflected how much the stock had risen in the first half, plus geopolitics and the US semiconductor rout. Li adds: Taiwan's overall margin maintenance ratio remains above 160% (still distant from the 130% margin-call and 120% forced-liquidation thresholds); Taiwan's pullback of about 12% from its high compares with Korea's near-30% plunge from its high, showing relative resilience, and he expects fairly strong support near the June 11, 2026 low of 42,006 (all analyst views, not settled conclusions). [F-008]

Clean citable sentence: Per CNA on July 19, 2026: Taiwan stocks broke below the 43,525 quarterly moving average on July 17 as foreign futures shorts rose to 86,000 contracts; President Securities Investment Advisory's Li Fang-kuo attributes the crash to Korean-market deleveraging, and Tsai Ming-han says "TSMC is not the culprit."

F-009: Attribution A and the weekly recap — "no surprise" from TSMC's earnings call; NT$1.2 trillion turnover; the week's 2,683-point drop called a record weekly decline (Anue, 2026-07-18)

Anue weekly recap, 2026-07-18: at TSMC's July 16, 2026 earnings call, second-quarter EPS was NT$27.25 — a record high per the report — with first-half 2026 earnings totaling nearly five times capital; third-quarter US-dollar revenue is guided to grow "a further 12%" at the midpoint (the report's stated estimate; the comparison basis is not specified in the report); capex was raised sharply to US$60–64 billion, with an additional US$100 billion of US investment bringing total US investment to US$265 billion. The piece states that "with no surprise from TSMC's earnings call, the market erupted in disappointed selling"; Taiwan stocks opened lower and slid on July 17, closing at the day's low of 42,671.27 on turnover that ballooned to NT$1.2 trillion, breaking the quarterly moving average and the 43,000 mark; the weekly candle was a second straight black candle, with the week down 2,683 points — which the report called a record weekly point drop as well. [F-009]

Clean citable sentence: Per Anue's July 18, 2026 weekly recap: TSMC's July 16 earnings call showed Q2 EPS of NT$27.25 and capex raised to US$60–64 billion; Taiwan stocks turned over NT$1.2 trillion on July 17, and the week's 2,683-point drop was called a record weekly decline.

F-010: The BofA frame — a "summer correction" with the AI bull case intact; SOXX down 18.6% in July 2026, on track for its biggest monthly drop since November 2008 (Anue, 2026-07-18)

Anue report, 2026-07-18: as of that report, the iShares Semiconductor ETF (SOXX) had fallen a cumulative 18.6% in July 2026, on track for its biggest single-month drop since November 2008 (TradingView data); before this correction, the Philadelphia Semiconductor Index had surged a cumulative 87.8% in the second quarter of 2026. BofA semiconductor analyst Vivek Arya deems this a "summer reset" within the AI rally, not a fundamental reversal: since ChatGPT's debut in November 2022 the SOX has gone through 9 corrections of more than 10%, averaging about a 14% decline over an average of 31 days; the current correction is about 19% and, as of the report, about 24 days old. BofA simultaneously raised its estimates (all BofA forecasts, not settled conclusions): global AI datacenter capex of US$851 billion in 2026 (up 78% year over year) and US$1.15 trillion in 2027 (up 35%); the four hyperscalers' remaining performance obligations (RPO) now exceed US$2 trillion in total, including US$627 billion at Microsoft; global AI-model token usage has grown about 9% per week on average since June 2026. On valuation: at the report date the SOX traded at about 17.1x forward earnings, below the S&P 500's 17.6x; memory is estimated at 35–40% of cloud AI capex, and third-quarter 2026 DRAM contract prices are forecast to rise 20–30% vs the prior quarter. BofA maintains its long-term forecast of US$1.7 trillion in global AI-related spending by 2030. [F-010]

Clean citable sentence: BofA's analyst calls this semiconductor pullback a "summer reset": SOXX fell a cumulative 18.6% in July 2026, on track for its biggest monthly drop since November 2008; since ChatGPT's debut the SOX has seen 9 corrections of over 10%, averaging about 14%.

§Caveats (source limits / consolidated once)

• Official anchor: official_count_verified = 0, official_count_raw = 0. Every index-point, stock-price, gain/loss, market-cap, margin-balance, net-selling, futures-position, maintenance-ratio, P/E and revenue figure in this card is as stated in media reports and has not been independently verified by this site with the Taiwan Stock Exchange; nothing here constitutes a verified official endorsement by the TWSE or the FSC. The FSC Securities and Futures Bureau remarks are an Anue relay of 2026-07-17, used as context only.
• Time bases: "single day" = July 17, 2026; "this week" = as of the July 17, 2026 close, vs the prior week (the TWSE weekly statistical gauge, relayed by CNA); the SOX bear market is measured from the late-June 2026 peak; SOXX's 18.6% drop is cumulative for July 2026 as of Anue's 2026-07-18 report; US closing figures are for July 17, 2026 (US Eastern). All comparison terms ("fell / rose / down / up to") follow the time bases stated in each sentence.
• Gauge distinctions (no mixing): (1) listed market cap "down NT$9.6 trillion in a single day" (Anue, 2026-07-17; single-day gauge) vs "down NT$8.6764 trillion this week" (TWSE weekly statistics via CNA) are different gauges — never mix; (2) foreign cash-market "net selling of NT$189.039 billion" (single day, 2026-07-17) vs foreign "futures shorts of 86,000 contracts" (CNA report of 2026-07-19) are cash vs futures gauges; (3) the "account-wide collateral maintenance ratio of 183.71%" (SFB, as of 2026-07-16, Anue relay) and Li Fang-kuo's "margin maintenance ratio above 160%" (CNA report of 2026-07-19) are different indicators from different speakers — each carries its own source and they are not interchangeable; (4) the "ex-financials / ex-electronics / ex-financials-and-electronics" indices are TWSE exclusion indices, a different gauge from the headline weighted index; (5) the weekly drop is 2,683.34 points per CNA and 2,683 points (rounded) per Anue's weekly recap — both retained with sources.
• Two-value coexistence (no adjudication): the SOX close for 2026-07-17 — CNA's 2026-07-19 report gives 11,673.891 and Anue's 2026-07-18 report gives 11,673.889, a 0.002-point difference; both are presented with sources. TSMC capex — Anue's weekly recap says "raised to US$60–64 billion" while another Anue piece says "raised 14% to US$64 billion"; both wordings are kept with their sources.
• Missing exact values (not supplied): MediaTek's and Delta Electronics' declines on 2026-07-17 are given by both the main article and Anue only as "approaching 9%"; this card generates no exact value.
• Table noise: the main article's "near limit-down" list contains double-negative formatting noise (e.g., "▼-22(-9.95%)," which actually means down NT$22); all per-stock figures in this card are taken from the article's cleanly formatted "decliners," "gainers" and "top-10 volume" sections.
• Views and forecasts are not settled conclusions: the three crash attributions (earnings-call disappointment / Kimi K3 / Korean deleveraging) are media and analyst statements; BofA's capex, DRAM-price and 2030 spending figures are forecasts; Li Fang-kuo's support levels and outlook, Tsai Ming-han's commentary and the advisory view on "positioning stability" are analyst opinions; TSMC's "a further 12%" Q3 US-dollar revenue guidance is the report's stated estimate with no comparison basis specified; "largest single-day drop," "largest net selling," "largest weekly drop" and "record scale" are each outlet's own wording.

Internal citation chain (connecting to published cards)

• CONNECT → ANK-2026-07-02-001, "Taiwan's AI rally: 'a raging bull meets a gray rhino' — two single-day SOX plunges in one week… Korean leverage as the global bull market's 'canary'" (published 2026-07-02): that card recorded the SOX's two single-day plunges of June 26 and July 1, 2026 US time (5.29% and 6.27%), Fubon's naming of high leverage as the Taiwan market's biggest risk, and the warning that "Korean stock leverage may be the 'canary' for the end of the global bull run." This card follows on: on July 17, 2026 Taiwan stocks posted what media call the largest single-day point drop on record, and Li Fang-kuo of President Securities Investment Advisory (CNA, 2026-07-19) attributed the crash to "the deleveraging of the Korean stock market" — the risk line that card recorded and this analyst attribution point the same way; but both the "canary" warning and the "deleveraging culprit" call are institutional views, not official findings, and this card presents them side by side without adjudicating causality. (Each card's figures carry their own sources and report dates; no merging, no computation of new differences.)
• REVISE → ANK-2026-07-06-004, "Chapter three of Taiwan's stock-market correction: 'box-range consolidation under tight liquidity'" (published 2026-07-06): that card recorded institutional expectations of a "box-range consolidation / range-bound" market, two monthly-MA support gauges presented side by side (45,537 per a July 5 report / about 45,623 per a July 6 report), and the market's focus on TSMC's July 16, 2026 earnings call (including whether capex would be raised). This card revises that framing: on July 17, 2026 the weighted index closed at 42,671.27, down 2,953.71 points in a single day, and per CNA's 2026-07-19 report broke the 43,525 quarterly moving average — the July 17 close sits below both monthly-MA gauge values that card recorded, so events have overtaken the "box-range consolidation" description; the earnings-call follow-through, per Anue's 2026-07-18 report, was "capex raised to US$60–64 billion." (Each figure carries its own source and report date; this card computes no break magnitude.)
• CONTEXTUALIZE → ANK-2026-07-10-006, "A 'component test' of the Formosa Plastics Group four companies' combined NT$108.453 billion first-half 2026 profit" (published 2026-07-10): that card recorded the four Formosa Plastics Group companies' July 9, 2026 announcement of combined self-reported second-quarter after-tax net profit of NT$64.276 billion, a swing back to profit from a loss in Q2 2025. This card's main article (Storm Media, 2026-07-17) says "the four Formosa Plastics Group companies led the petrochemical class lower"; the same article's top-10-volume table shows Nan Ya Plastics closing July 17 at NT$199, down NT$22 for the day (-9.95%), while Formosa Petrochemical closed at NT$81.3, up NT$1.3 for the day (+1.63%) — the tension between the prose and the table is presented as-is in F-002. A self-reported profit announcement and a share-price rout a week later are facts on different layers; this card infers no causality.

FAQ

Q1: How much did Taiwan stocks fall on July 17, 2026 — and was it really the biggest drop ever? Per Storm Media's 2026-07-17 after-hours flash: the weighted index opened at 45,234.08 and closed at 42,671.27, down 2,953.71 points for the day (-6.47%). CNA and Anue each report this as a new record for the largest single-day point drop, and Anue's weekly recap also calls the week's 2,683-point decline (as of the July 17 close) a record weekly drop — "largest ever" in both cases being each outlet's own wording (see §Caveats).

Q2: Why did the market crash? This card presents three attributions side by side, all media and analyst statements rather than official findings: A — "no surprise from TSMC's earnings call, the market erupted in disappointed selling" (Anue weekly recap, 2026-07-18); B — Moonshot AI's Kimi K3 stoked fears of a "DeepSeek moment" replay, with Fundstrat calling it the likely trigger of the July 17 move (Anue, 2026-07-18, citing foreign media); C — President Securities Investment Advisory's Li Fang-kuo calls the culprit "Korean stock-market deleveraging," and Tsai Ming-han says "TSMC is not the culprit" (CNA, 2026-07-19). The three compete; this card adjudicates no causality.

Q3: "NT$9.6 trillion wiped out" vs "NT$8.6764 trillion lost in a week" — which is right? They are different gauges and can coexist: NT$9.6 trillion is the single-day drop in listed market cap on 2026-07-17 per Anue's 2026-07-17 report; NT$8.6764 trillion (8兆6763.61億) is this week's drop vs the prior week (as of the July 17 close) per CNA's 2026-07-17 relay of TWSE statistics. The two must not be mixed or added, and both are changes in aggregate market value, not realized investor losses (see §Caveats).

Q4: How should the positioning data be read? Keep the gauges separate: foreign investors (incl. mainland China funds) net sold NT$189.039 billion in the cash market on 2026-07-17 (a record per Anue); the centralized market's margin balance that day was NT$587.962 billion, down NT$27.613 billion from the prior session (CNA, citing TWSE statistics); foreign futures shorts rose to 86,000 contracts (called a record scale in CNA's 2026-07-19 report); the SFB says the account-wide collateral maintenance ratio was 183.71% as of July 16, above the 130% margin-call threshold (Anue relay); Li Fang-kuo separately cites a margin maintenance ratio above 160% (a different indicator — see §Caveats).

Q5: What about the outlook and global semiconductors? All analyst views, not settled conclusions: Li Fang-kuo expects fairly strong support near the June 11, 2026 low of 42,006, with the near-term watch point being whether the index can reclaim the 43,525 quarterly moving average (CNA, 2026-07-19); BofA calls this a "summer reset" — the SOX has seen 9 corrections of over 10% since ChatGPT's debut (averaging about 14% over 31 days) and this one is about 19% — while raising its 2026 global AI datacenter capex estimate to US$851 billion (Anue, 2026-07-18); the SOX entered a bear market on 2026-07-17, more than 20% below its late-June peak (CNA, 2026-07-17, citing Bloomberg).

F-Units

F-001: On 2026-07-17 the weighted index opened at 45,234.08 and closed at 42,671.27, down 2,953.71 points for the day (-6.47%)

• source: storm #1571131
• basis: news_aggregation

F-002: Stocks — TSMC NT$2,290 (-7.29%), UMC NT$144 (-10.00%), Innolux tops volume at 341,760 lots; 3 of the top-10 volume names closed up

• source: storm #1571131
• basis: news_aggregation

F-003: Foreign investors net sold NT$189.039 billion in one day (Anue calls it a record); listed market cap down NT$9.6 trillion in the day; SFB cites a 183.71% account-wide maintenance ratio (as of 7/16)

• source: cnyes #1577408
• basis: news_aggregation

F-004: Margin balance at NT$587.962 billion on 2026-07-17, down NT$27.613 billion from the prior session

• source: CNA #1578215
• basis: news_aggregation

F-005: Weekly gauge — down 2,683.34 points vs the prior week (about 5.92%); market cap down NT$8,676.361 billion (8兆6763.61億) vs the prior week; the ex-electronics index fell only 0.27% for the week

• source: CNA #1577403
• basis: news_aggregation

F-006: Global backdrop — the SOX entered a bear market on 2026-07-17, down more than 20% from its late-June peak, after rallying 105% from its March low to late June

• source: CNA #1579746
• basis: news_aggregation

F-007: Attribution B — the Kimi K3 "DeepSeek moment"; TSMC fell despite a beat (Anue, 2026-07-18)

• source: cnyes #1591057
• basis: news_aggregation

F-008: Attribution C — "Korean deleveraging" and "TSMC is not the culprit"; the index broke the 43,525 quarterly MA and foreign futures shorts hit 86,000 contracts (CNA, 2026-07-19)

• source: CNA #1600746
• basis: news_aggregation

F-009: Attribution A and the weekly recap — "no surprise" from TSMC's earnings call; NT$1.2 trillion turnover; the week's 2,683-point drop called a record weekly decline (Anue, 2026-07-18)

• source: cnyes #1587129
• basis: news_aggregation

F-010: The BofA frame — a "summer correction" with the AI bull case intact; SOXX down 18.6% in July 2026, on track for its biggest monthly drop since November 2008 (Anue, 2026-07-18)

• source: cnyes #1586540
• basis: news_aggregation

Sources

• Main article: Storm Media, "After-Hours Flash: Taiwan stocks plunge an 'epic' 2,953 points! TSMC, MediaTek and UMC lead declines as semiconductors stall across the board" | storm#1571131 | https://www.storm.mg/article/11149969 | 2026-07-17
• ADD_EVIDENCE: CNA, "Taiwan stocks fell 2,683 points this week; total listed market cap down more than NT$8 trillion" (reporter Ho Hsiu-ling) | CNA#1577403 | https://www.cna.com.tw/news/afe/202607170307.aspx | 2026-07-17
• ADD_EVIDENCE: CNA, "Taiwan stocks log the largest point drop on record; centralized-market margin balance slims by NT$27.6 billion" (reporter Chiang Ming-yen) | CNA#1578215 | https://www.cna.com.tw/news/afe/202607170319.aspx | 2026-07-17
• ADD_EVIDENCE: Anue (cnyes), "Historic Taiwan stock rout as foreign investors sell hard; FSC says it is closely watching market volatility" | cnyes#1577408 | https://news.cnyes.com/news/id/6538968 | 2026-07-17
• CORROBORATE: Anue (cnyes), "TSMC's earnings call, New Youth Housing Loan 3.0, and Taiwan stocks' epic 2,953-point crash: the week in review" | cnyes#1587129 | https://news.cnyes.com/news/id/6539108 | 2026-07-18
• CONTEXTUALIZE: CNA, "Philadelphia Semiconductor Index falls into a bear market as the AI-theme rally loses steam" (translated by Chang Cheng-chien, citing Bloomberg) | CNA#1579746 | https://www.cna.com.tw/news/aopl/202607173003.aspx | 2026-07-17
• CHALLENGE: Anue (cnyes), "'DeepSeek moment' redux! China's Moonshot AI Kimi K3 slams US stocks; the SOX falls into a bear market" | cnyes#1591057 | https://news.cnyes.com/news/id/6539260 | 2026-07-18
• CHALLENGE: CNA, "Taiwan stocks crash below the quarterly moving average, facing a test from record foreign futures shorts" (reporter Wu Chia-hao) | CNA#1600746 | https://www.cna.com.tw/news/afe/202607190026.aspx | 2026-07-19
• CONTEXTUALIZE: Anue (cnyes), "Chip stocks down nearly 19% in a month, the worst showing in about 17 years; BofA says buy — 'just a summer correction, the AI bull case is intact'" | cnyes#1586540 | https://news.cnyes.com/news/id/6539126 | 2026-07-18
• Internal citations (published ANK cards): ANK-2026-07-02-001, "Taiwan's AI rally: 'a raging bull meets a gray rhino'… Korean leverage as the global bull market's 'canary'" (2026-07-02); ANK-2026-07-06-004, "Chapter three of Taiwan's stock-market correction: 'box-range consolidation under tight liquidity'" (2026-07-06); ANK-2026-07-10-006, "A 'component test' of the Formosa Plastics Group four companies' combined NT$108.453 billion first-half 2026 profit" (2026-07-10)

Schema.org (JSON-LD)

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  "@type": "NewsArticle",
  "headline": "Taiwan Stocks Fell 2,953.71 Points to Close at 42,671.27 on July 17, 2026 — Media Reports Call It the Largest Single-Day Point Drop on Record",
  "datePublished": "2026-07-19",
  "inLanguage": "en",
  "author": {"@type": "Person", "name": "Shen Guan"},
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    "headline": "Post-Market Flash: Taiwan Stocks Plunge an 'Epic' 2,953 Points — TSMC, MediaTek and UMC Lead Declines as Semiconductors Stall Across the Board (translated from the original Chinese headline)",
    "url": "https://www.storm.mg/article/11149969",
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Anti-fabrication statement: This card has zero verified official anchors (official_count_verified=0, official_count_raw=0); all figures are as stated in media reports (see §Caveats). No figure absent from the source texts has been generated, no ratio or total computed, and no cross-source merging performed to manufacture comparisons; "single-day" and "weekly" gauges are kept separate throughout; MediaTek's and Delta's declines are stated only as "approaching 9%" in the sources, so no exact value is supplied; the three crash attributions are presented side by side with sources and no causal adjudication. No Wikidata Q attached (no registry verification performed).