This is not profit-taking. It is a liquidation, and it is four-fifths doneKeith A. Meister · Director, Illumina, Inc. (NASDAQ: ILMN)
- What they did
- On 3–4 November 2026 sold 281,433 Illumina common shares at an average $236.50, for $66,560,212. Held indirectly for the Corvex Funds (Corvex Master Fund LP, Corvex Select Equity Master Fund LP), advised by Corvex Management LP, whose general partner Meister controls. No Rule 10b5-1 plan is marked. Shares held after: 488,917 indirect, plus 6,780 held directly and untouched throughout.
- The document
- SEC Form 4, Illumina, Inc., reporting person Meister Keith A., accession 0001011438-26-000653, filed 5 Nov 2026 at 5:15pm ET. Prior filings in the chain: Form 4 signed 6 Aug 2026 (transactions 4–5 Aug) and Form 4 accepted 4 Sep 2026 (transactions 2–4 Sep). Fields read via StockTitan and Finwire transcriptions; I could not open EDGAR directly from this environment.
| Window | Sold | Wtd avg | % of what was left | Held after |
|---|---|---|---|---|
| Base, pre 4 Aug | — | — | — | 2,830,552 |
| 4–5 Aug 2026 | 741,127 | ~$199.60 | 26.2% | 2,089,425 |
| Aug gap (not retrieved) | ~1,055,515 | — | ~50.5% | ~1,033,910 |
| 2–4 Sep 2026 | 263,560 | ~$217.00 | 25.5% | 770,350 |
| 3–4 Nov 2026 | 281,433 | $236.50 | 36.5% | 488,917 |
| Cumulative | 2,341,635 | rising | −82.7% | 488,917 |
Consensus read
Textbook activist profit-taking, and well earned. Meister joined Illumina’s board on 28 March 2025 when the company was in the wreckage of the GRAIL affair. Since then Illumina is up about 98.7% over twelve months and 43.7% in 2026, rejoined the S&P 500 on 21 September after a June 2024 removal, and on 29 October beat on Q3 and raised full-year guidance.
So: a director monetising a successful campaign in the first open window after a good print, at a price near the highs. Mildly bearish as a signal, entirely rational as a trade.
Contrarian read
“Profit-taking” implies a judgement about Illumina’s price. The shape of the sequence says the price is not what is driving it. This is a wind-down to a board-qualifying stub, running in every open window since early August, and it is 82.7% complete.
The claim, which can be wrong: the remaining 488,917 shares are substantially gone within two quarters, and Corvex ceases to be a meaningful Illumina holder while Meister keeps the directorship. The November tranche is the acceleration, not the end.
Evidence that discriminates
- Each tranche takes a larger share of what remains, at a higher price. 26.2% at ~$199.60, then 25.5% at ~$217, then 36.5% at $236.50. This is the fact that separates the two readings. A seller with a price target decelerates as the price runs past it — that is what a target is. A seller working down a position accelerates as the remaining block gets small enough to clear. The percentage column moves the wrong way for the consensus story and the right way for mine.
- No Rule 10b5-1 plan on any of the four tranches. This is the single cheapest thing a director can do and he has not done it four times running. A multi-quarter diversification programme is precisely the use case the rule exists for: adopt once, sell on a schedule, never face the question again. Four consecutive discretionary sales means each decision is being made fresh, in an open window, by someone who would rather keep the discretion than have the shield. That is what fund-level selling looks like. It is not what a pre-decided personal programme looks like.
- What he protected is the seat, not the exposure. The 6,780 directly-held shares and the quarterly stock retainer are untouched across all three filings. Before August, those retainers — about 107 shares a quarter — were the entirety of his Illumina Form 4 activity. The holding that qualifies him as a director survives; the holding that is the investment is going.
- The “37%” in every headline is measured off the September residual. 281,433 of 770,350 is 36.5%. Off the corrected August base of 2,830,552 the cumulative figure is 82.7%. Both numbers are true; only one of them describes the decision.
Why it happened is not knowable from these documents. Three live hypotheses, with what would separate them: (a) fund-level — Corvex redemptions or risk limits forcing a wind-down irrespective of view; distinguished by whether Corvex’s next 13F shows other large positions shrinking in the same quarters and total reported value falling. (b) Thesis realised — Meister thinks the re-rating is done; distinguished by whether the residual stabilises near 489k rather than continuing to zero. (c) A glide path he agreed to — terms attached to the March 2025 board appointment; distinguished by the cooperation or standstill agreement, if one exists, in Illumina’s proxy. The 25 March 2025 announcement names no such agreement, which is weak evidence against (c), not proof.
What would falsify me
Corvex’s Q4 2026 13F showing the Illumina position flat or higher than 488,917 shares. Or Meister adopting a Rule 10b5-1 plan to dispose of the remainder on a schedule — that would make it the orderly diversification programme I have argued it is not. Or the next Form 4 showing a purchase. Any of the three and the “wind-down” characterisation is wrong and the ordinary “he trimmed into strength” reading should stand.
The honest gap. One filing in this chain I did not retrieve — the roughly 1,055,515 shares that left between 5 August and 2 September. The 82.7% cumulative figure does not depend on it, because it is computed from the first and last “owned after” fields, which I did read. But the per-tranche percentages in the table skip a step, and if that intervening sale was under a 10b5-1 plan, point 2 above weakens materially. Treat the four-for-four plan claim as covering the three filings I read.
Pattern vs his own historyCorvex was the activist that came in near the bottom; Meister took the seat on 28 March 2025 alongside Scott Gottlieb’s election as chair, and brought MGM, GeneDx and Vestis board experience with him. For the first sixteen months his filings record nothing but retainer shares. Then, starting the week of 4 August, 2.34 million shares leave in three months at steadily rising prices, none of it planned, none of it slowing. The September tranche went off on 2–4 September, about two weeks before Illumina’s 21 September S&P 500 re-inclusion created the largest block of forced index demand the stock had seen in two years. I note the adjacency because it is the kind of liquidity a 2.3-million-share seller needs; I am not alleging it was known, and the index announcement date is not something I verified.