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The deeper account

The line was drawn on 13 August, when the index closed at 7,798.99 and printed 7,800 for the first time; the next morning it traded as high as 7,810.01, and then it went away for seven weeks. On Monday it came back to within 4.64 points of the line at 3:19 and closed 25.04 under it. Whatever happened next happened before the opening bell: on Tuesday the first trade was 7,805.96, 32.01 points above Monday's close, 6.97 above the record and already the lowest price the index would see all day. It closed its first minute at 7,816.23, the biggest minute of the session, passed August's intraday high of 7,816.70 at 9:31, and made a new high for the day thirty times after its first minute, the last of them at 11:26, at 7,844.52. For the four and a half hours after that it made no new high at all, and drifted back 25.59 points to close at 7,818.93 — still 19.94 above the old record, and 2.23 above August's intraday high. Not one minute of the 390 closed at or below the line.

That is rarer than a record. Since 1990 the S&P 500 has set 793 record closes; forty-nine of them ended a wait of thirty sessions or more, and in only six of those forty-nine did the index never trade below the old record from the open to the close — in July 2016, October 2019, May and September 2024, on 4 August this year, and on Tuesday. Two of the six are in 2026. Tuesday's was the twenty-eighth record close of the year, and the first since 13 August, after thirty-six sessions without one.

Constellation Energy rose 12.25 percent, to $300.40, after it and Google announced a twenty-year agreement under which Google pays for 890 megawatts of new capacity at eleven nuclear units Constellation already runs in Illinois, Pennsylvania and New Jersey — new turbines, steam generators and digital controls, "increasing thermal and electrical efficiency to unlock additional reliable, firm power," in the words of the release, which calls the result the equivalent of a new reactor. Constellation will invest more than $4.3 billion; the two also signed a fifteen-year agreement for another 2,700 megawatts. "Preserving and expanding the output of the existing nuclear fleet and developing new clean generation is critical to meeting our nation's growing energy needs," said Joe Dominguez, its chief executive. Vistra rose 10.77 percent, NRG 7.02 and GE Vernova 3.96, and utilities were the best sector of the day, up 2.98 percent.

It was a broad day for the large companies and not for the small ones. Ten of the eleven sectors rose and the equal-weight fund rose 0.57 percent against the index's 0.58; only health care fell, 0.17 percent. Moderna lost 7.75 percent after the World Health Organization called the risk from a plague death at a Russian laboratory low. But the small-company fund fell 0.72 percent on a record day. Ciena rose 13.85 percent after Marvell raised its revenue outlook for its 2028 fiscal year to about $20 billion and rose 5.81 percent itself; Cisco rose 4.54, Broadcom 3.67 and AMD 2.80. Nvidia closed at a record $239.24, up 0.14, after touching a record $243.37. Seagate fell 9.18 percent and Western Digital 6.93, after reports that Toshiba will double its drive output and is bidding, with Seagate, for TDK's head business. The Nasdaq Composite closed at a record for a second day, 27,599.79, and the Dow rose 253.38 points to 51,521.28.

One company had a different first day. Twilio joined the S&P 500 at Tuesday's opening bell, taking the place of Warner Bros. Discovery, which Paramount Skydance is acquiring. The funds that track the index had to own it by then, and on Monday 34.9 million Twilio shares changed hands; on Tuesday 4.0 million did, and Twilio fell 6.81 percent, to $280.41, on the day the index it had just joined set a record. Nothing was announced. The arithmetic of joining tends to work like that.

Money stayed expensive underneath it. At one o'clock the Treasury sold $58 billion of three-year notes at 4.932 percent, the highest yield at a three-year auction since May 2006; the index moved less than three points. The ten-year yield eased to 5.27 percent from 5.31, without a new high. Before the open the Commerce Department reported that the trade deficit widened to $105.6 billion in August, the widest since March 2025, on record imports. Traders put the odds of a rate increase at the Federal Reserve's October meeting at about one in five, down from about one in two a week earlier; the minutes of the September meeting are due on Wednesday. Brent crude settled at $100.58, up 0.2 percent, after falling about 3 percent early and recovering (NBC News).

Two honest notes. Index levels, sector funds and company prices are the feed's official closing prints; the Dow and the Nasdaq are AP's figures, and the six-in-forty-nine count comes from Yahoo Finance's daily history of the index, which matches the feed's closes for both days on this page. Nobody has said why Twilio fell; the paragraph above describes what the index funds did and does not claim it was the reason.

In the photograph it is a quarter past seven on an October morning, and the first snow of the year has come in the night, onto maples that had not finished being red. By the time the man in the grey suit comes through the park gate with his paper bag, the snowball fight has been going since first light, and nobody waited for him: the snow is trampled, a wall is half built, two children are making more ammunition behind it, and the clown with the teal wig, who started it, has already thrown. The snowball is in the air between them. It has not landed yet. He has only just seen it, and he is delighted.