Key Highlights

● MSCI's final list of non-operating companies is due November 11, with changes after November 30.

● Strategy, holder of 848,250 bitcoin, became one of Friday's most discussed Nasdaq-100 stocks.

● Riot Platforms and Cipher Digital fell in the morning while bitcoin traded near $81,500.

● The Nasdaq Composite closed its worst week since the week ended June 26.

A date on the calendar

For shareholders of Strategy (NASDAQ:MSTR), one date now stands out: November 11. According to market reports, that is when index provider MSCI (NYSE:MSCI) is due to publish its final list of companies affected by its new rules on "non-operating companies." Changes take effect after the close on November 30.

One report said MSCI approved rules making companies that mainly hold investments ineligible for its Global Investable Market Indexes. Strategy, which holds 848,250 bitcoin according to market data, is the best-known company built around such a holding. Other reports said the rules could lead to its removal from MSCI's global indexes.

That prospect made Strategy one of the most talked-about names on the Nasdaq-100 on Friday. The shares slid, closing at $136.72, per market data. Reports differed on the size of the decline, with morning figures showing a smaller drop than later readings.

What the rules could mean

Major index providers set the benchmarks that many passive funds track. If a company is removed, funds following that benchmark typically sell, which is why index decisions can move share prices. For Strategy, whose business strategy revolves around accumulating bitcoin, the MSCI decision goes to the heart of how the company is classified.

Sources did not agree on every detail. Some reports described non-operating companies as becoming ineligible after November 30. Another report said MSCI replaced interim limits with financial tests, and that current members would be removed only after failing the screen in two consecutive annual filing periods. The November 11 list should help clarify how the rules will be applied in practice.

Crypto-linked stocks feel the pressure

The MSCI rules weighed beyond Strategy. Per market reports, the index-rule pressure on bitcoin-linked equities spread to miners, with Riot Platforms (NASDAQ:RIOT) falling to $14.94 in the morning and Cipher Digital (NASDAQ:CIFR) slipping to $9.75. The WGMI crypto-miner ETF fell steeply.

Bitcoin itself was little changed to slightly lower, trading around $81,500 to $81,600, per market data. Market commentary said the cryptocurrency was headed for a second straight weekly loss, and a further report pointed to a liquidation wave from Thursday into Friday.

A broad tech selloff

Strategy's slide came on a difficult day for growth stocks. The Nasdaq Composite fell 572.99 points to 26,140.03, while the Nasdaq-100 also dropped sharply, though sources differed on the size of the move. The S&P 500 lost 84.62 points to 7,659.44, and the Dow Jones Industrial Average slipped 175.28 points to 52,002.41.

Per market commentary, investors moved from asking what artificial intelligence can do to asking how it will be financed, a shift that punished debt-reliant companies. Energy, utilities and consumer staples gained while technology lagged. The Nasdaq Composite closed out its worst week since the week ended June 26.

Strategy Holders Await Screening Clarity

November 11 is the headline date: MSCI's final list will show which companies fall under the non-operating rules. The effective date follows after the close on November 30, according to market reports. Holders will also be watching for confirmation of whether existing index members face the two-period screening process that one report described.

The Federal Reserve's next rate decision is due October 28. Fed Chair Kevin Warsh declined to preview it, saying, "I don't prejudge meetings." In the nearer term, bitcoin's price action remains a key driver for the stock.