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The biggest US insider buys in 2026

The largest open-market purchases insiders made in their own companies, ranked by what they spent, with how each has performed against the market since it was disclosed.

ddbx started recording disclosures in March 2026, so periods described as a full year cover only the filings since then.

25 purchases, $444m in total, across 17 companies. Median alpha since disclosure: -0.8pp.

#	Company	Bought by	Date	Value bought	Alpha since disclosure
1	Liberty Latin America Ltd.	MALONE JOHN C	2026-05-22	$107mworth $150m if still held	+42.2pp
2	Summit Therapeutics Inc.	DUGGAN ROBERT W	2026-06-12	$50mworth $49m if still held	-2.7pp
3	RBC BlueBay Enhanced Income Fund	RBC Global Asset Management (U.S.) Inc.	2026-05-28	$49m	n/a
4	REPUBLIC SERVICES, INC.	CASCADE INVESTMENT, L.L.C.	2026-05-13	$35mworth $37m if still held	+6.5pp
5	REPUBLIC SERVICES, INC.	CASCADE INVESTMENT, L.L.C.	2026-05-14	$31mworth $32m if still held	+0.6pp
6	REPUBLIC SERVICES, INC.	CASCADE INVESTMENT, L.L.C.	2026-05-14	$20mworth $20m if still held	+0.6pp
7	Lafayette Square USA, Inc.	Employees' Retirement System of the State of Hawaii	2026-06-26	$20m	n/a
8	Quantinuum Inc.Part of a cluster of 10 insiders	Barron Hal	2026-06-05	$15mworth $13m if still held	-11.0pp
9	Cosan S.A.	Martins Marcelo Eduardo	2026-05-19	$13m	n/a
10	Artiva Biotherapeutics, Inc.	GC Corp.	2026-05-11	$12mworth $16m if still held	+33.4pp
11	Cosan S.A.	Martins Marcelo Eduardo	2026-04-10	$11m	n/a
12	CION Ares Diversified Credit Fund	THRIVENT FINANCIAL FOR LUTHERANS	2026-07-06	$11m	n/a
13	Mission Produce, Inc.Part of a cluster of 2 insiders	Globalharvest Holdings Venture Ltd	2026-07-08	$9.2mworth $8.6m if still held	-5.6pp
14	Mission Produce, Inc.Part of a cluster of 2 insiders	Globalharvest Holdings Venture Ltd	2026-07-06	$8.3mworth $7.6m if still held	-7.5pp
15	Mission Produce, Inc.Part of a cluster of 2 insiders	Globalharvest Holdings Venture Ltd	2026-07-09	$7.9mworth $7.3m if still held	-5.1pp
16	Netskope Inc	ICONIQ Strategic Partners VIII Holdings, L.P.	2026-07-08	$7.2mworth $6.8m if still held	-4.7pp
17	Liberty Latin America Ltd.Part of a cluster of 2 insiders	MALONE JOHN C	2026-06-22	$5.5mworth $6.2m if still held	+12.8pp
18	TXO Partners, L.P.	SIMPSON BOB R	2026-06-03	$5.1mworth $5.0m if still held	-0.8pp
19	Carlyle Tactical Private Credit Fund	THRIVENT FINANCIAL FOR LUTHERANS	2026-06-23	$5.0m	n/a
20	FIRST TRUST ALTERNATIVE OPPORTUNITIES FUND	PECK MICHAEL D	2026-07-02	$5.0m	n/a
21	StepStone Group Inc.	McCabe Michael I	2026-06-11	$4.0mworth $4.0m if still held	-0.5pp
22	Quantinuum Inc.Part of a cluster of 10 insiders	JIMENEZ JOSEPH	2026-06-05	$4.0mworth $3.6m if still held	-11.0pp
23	Tecnoglass Inc.	Energy Holding Corp	2026-05-14	$3.3mworth $3.8m if still held	+14.2pp
24	TXO Partners, L.P.	SIMPSON BOB R	2026-06-02	$3.1mworth $3.0m if still held	-0.8pp
25	INNIO N.V.	LINEBARGER NORMAN THOMAS	2026-06-05	$2.5mworth $1.9m if still held	-22.6pp

Held back so one company can’t fill the board: RSG (11 more), AVO (1 more).

How this is put together

• Only open-market purchases count. Share allotments, vesting, option exercises and placings are disclosed the same way but aren't purchases at a market price, and they are frequently the largest disclosures — so including them would put a share award at the top of a page about buying.
• UK rows must be classified as open-market buys by comparing the filed price against that day's close. Rows we can't price yet are left out rather than assumed innocent. US rows come from a feed already restricted to Form 4 transaction code P, excluding derivatives and amendments.
• Each purchase is listed individually. Several insiders buying the same company on the same day appear as separate rows — that's several disclosures, not one large one. Where a purchase forms part of a cluster, it's marked.
• No more than three purchases from any single company appear on a board. One issuer filing the largest handful of the year would otherwise fill it and answer nothing; where entries are held back, the count is shown.
• Values are in the market's own currency and are never converted, so no exchange rate is involved.
• Performance is measured from the closing price on the day the purchase was disclosed — the first price a reader could have paid — not from the insider's own fill, and is marked against the most recent cached close rather than a live quote.
• Alpha is the purchase's own return minus the market's return over the same period, stated in percentage points: a buy up 8% while the index rose 5% has alpha of +3. The board is ranked by the size of the purchase, never by alpha.
• “Worth if still held” applies the stock's own move since disclosure to the amount originally spent. It assumes the shares were never sold and counts no dividends, costs or tax — it's a scale, not a valuation of anyone's actual holding.
• Companies that have since delisted may stop being priced, so their entries can show no performance figure. Past performance is not a reliable indicator of future results.

Boards by year

The last twelve months

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