Week of Jan 12 – Jan 16, 2026
By Trabud Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Notable insider activity this week was dominated by a $150.3 million sale of Redwire (RDW) shares by AE Industrial Partners and affiliates, alongside a $62.5 million sale by Goldman Sachs director David Viniar. On the buy side, MS&AD Insurance Group accumulated $92.3 million in W.R. Berkley (WRB) stock, while Fairfax Financial’s Prem Watsa added $49.7 million of Under Armour (UA) and multiple biotech funds poured $60 million into Aktis Oncology (AKTS).
- Total bought
- $274.6M
- 10 filings
- Total sold
- $364.5M
- 10 filings
- Companies
- 15
- tracked this week
- Net flow
- −$89.9M
- net selling
Top insider buys
| # | Company | Insider | Shares | Value |
|---|---|---|---|---|
| 1 | WRB◇2BERKLEY W R CORP | MITSUI SUMITOMO INSURANCE CO LTDOther | 811.0K | $55.6M |
| 2 | UAUnder Armour, Inc. | Prem V Watsa ET ALOther | 8.6M | $49.7M |
| 3 | AKTS◇5Aktis Oncology, Inc. | EcoR1 Capital, LLCDirector | 2.2M | $40.0M |
| 4 | WRB◇2BERKLEY W R CORP | MITSUI SUMITOMO INSURANCE CO LTDOther | 535.0K | $36.6M |
| 5 | AKTS◇5Aktis Oncology, Inc. | Luke EvninOther | 1.1M | $20.0M |
| 6 | AKTS◇5Aktis Oncology, Inc. | Ansbert GadickeOther | 1.1M | $20.0M |
| 7 | AKTS◇5Aktis Oncology, Inc. | Helen Susan KimDirector | 835.0K | $15.0M |
| 8 | AKTS◇5Aktis Oncology, Inc. | Vida Ventures II, LLCOther | 835.0K | $15.0M |
| 9 | PARPAR TECHNOLOGY CORP | Travis W. CockeOther | 526.2K | $14.7M |
| 10 | MUMICRON TECHNOLOGY INC | Teyin M LiuDirector | 23.2K | $7.8M |
Top insider sells
| # | Company | Insider | Shares | Value |
|---|---|---|---|---|
| 1 | RDWRedwire Corp | Michael Robert GreeneDirector | 14.3M | $150.3M |
| 2 | GSGOLDMAN SACHS GROUP INC | David A ViniarDirector | 64.8K | $62.5M |
| 3 | DBDDIEBOLD NIXDORF, Inc | Brian D ConnollyOther | 500.0K | $34.0M |
| 4 | BLKBlackRock, Inc. | Martin SmallCFO | 27.0K | $31.7M |
| 5 | NRGVEnergy Vault Holdings, Inc. | SOFTBANK VISION FUND (AIV M2) L.P.Other | 3.0M | $16.9M |
| 6 | IRIngersoll Rand Inc. | Vicente ReynalCEO | 191.0K | $16.8M |
| 7 | NETCloudflare, Inc. | Michelle ZatlynPresident | 76.9K | $14.5M |
| 8 | DVLTDatavault AI Inc. | Scilex Holding CoOther | 16.0M | $13.2M |
| 9 | DALDELTA AIR LINES, INC. | Edward H BastianCEO | 173.2K | $12.3M |
| 10 | PBFPBF Energy Inc. | Control Empresarial de Capitales S.A. de C.V.Other | 366.0K | $12.2M |
Quick Answer
What were the biggest insider trades the week of Jan 12 – Jan 16, 2026?
For the week of Jan 12 – Jan 16, 2026, the biggest buy was $55.6M of WRB by MITSUI SUMITOMO INSURANCE CO LTD; the biggest sale was $150.3M of RDW by Michael Robert Greene.
Source: SEC EDGAR Form 4
Frequently Asked Questions
Which insider bought the most the week of Jan 12 – Jan 16, 2026?
MITSUI SUMITOMO INSURANCE CO LTD (Other) bought $55.6M of BERKLEY W R CORP (WRB) — the largest insider purchase of the week by dollar value.
Which insider sold the most the week of Jan 12 – Jan 16, 2026?
Michael Robert Greene (Director) sold $150.3M of Redwire Corp (RDW) — the largest insider sale of the week by dollar value.
How are these insider trades ranked?
Trabud ranks each week's SEC Form 4 filings by total transaction dollar value, surfacing the largest open-market insider buys and sells. All data comes directly from official SEC EDGAR filings.
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