The cluster is dominated by two large active managers (Assenagon and Robeco) accumulating significant positions, but offset by a material trim from Artemis. Monitor upcoming 13F filings and any 8-K or earnings release for confirmation of the thesis that drove these Q3 moves. The divergence between buyers and sellers suggests the stock may be at a valuation inflection point.
Executive Summary
A mixed institutional cluster in MKSI shows two large active managers making opposite moves: Assenagon Asset Management more than doubled its stake to $117.4M (a $106.7M increase) and Robeco initiated a $21.2M new position, while Artemis Investment Management trimmed by $40.5M. The net buying of $87.1M is driven by two concentrated bets, but the presence of a significant seller tempers the bullish signal. Given the 45-day reporting lag, this cluster may reflect Q3 positioning that has since been adjusted.
Key Financial Metrics
Institutional Positions
Net institutional flow: $87.1M
▲ Buyers (4)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | DOUBLED | +1742.1% | $117.4M | $106.7M |
| Robeco Institutional Asset Management B.v. | NEW | +0% | $21.2M | $21.2M |
| Mather Group | DOUBLED | +911.1% | $24.0K | $20.0K |
| Td Waterhouse Canada | DOUBLED | +9200% | $76.0K | $74.0K |
▼ Sellers (2)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Artemis Investment Management | TRIM | -39.9% | $63.2M | -$40.5M |
| Farther Finance Advisors | TRIM | -56.4% | $510.0K | -$377.0K |
Key Facts
- 4 institutional buyers added $128.0M in aggregate, led by Assenagon ($106.7M increase) and Robeco ($21.2M new position)
- 2 institutional sellers reduced by $40.9M, led by Artemis Investment Management ($40.5M trim)
- Net institutional inflow of approximately $87.1M across the cluster
- All buyers are active asset managers, not passive/index funds, strengthening the signal
Financial Impact
Net institutional buying of approximately $87.1M, with total buyer holdings of $138.7M vs seller reductions of $40.9M
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end
- Artemis's $40.5M trim is a meaningful counter-signal from a sophisticated manager
- No insider buying corroboration provided, weakening the conviction signal
Investment Themes
Documents Analyzed
This report is based on 1 institutional 13F filing from SEC EDGAR.
| Document | Accession Number |
|---|---|
| INST-CLUSTER Data (Synthetic) | inst-cluster-MKSI-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 20, 2026 7d ago | Institutional Cluster | $216.10 | awaiting T+5 | — | — |
Oct 19, 2026 8d ago | 8-K | $215.41 $202.28 | ▼ −6.10% | ▼ −5.95% | — |
Oct 19, 2026 8d ago | Press Release | $215.41 $204.80 | ▼ −4.93% | ▼ −4.78% | — |
Sep 1, 2026 8w ago | 144 | $246.44 $268.05 | ▲ +8.77% | ▲ +8.69% | — |
Jul 13, 2026 15w ago | Press Release | $352.03 $324.69 | ▼ −7.77% | ▼ −6.98% | — |
Jun 8, 2026 20w ago | Insider Cluster | $312.09 $375.32 | ▲ +20.26% | ▲ +18.15% | — |
Jun 2, 2026 21w ago | Insider Cluster | $329.66 $320.96 | ▼ −2.64% | ▲ +0.33% | — |
Jun 2, 2026 21w ago | Insider Cluster | $329.66 $320.96 | ▼ −2.64% | ▲ +0.33% | — |
May 28, 2026 21w ago | Insider Cluster | $323.41 $328.44 | ▲ +1.56% | ▲ +1.24% | — |
May 28, 2026 21w ago | Insider Cluster | $323.41 $328.44 | ▲ +1.56% | ▲ +1.24% | — |
US Market Status
Subscribe to SecBot
Get Real-Time SEC Filing Intelligence
Comprehensive SEC filing analysis delivered the moment filings hit EDGAR. Sentiment scoring, impact analysis, and actionable insights for every material event.
Create a free account Live analysis, Telegram alerts, watchlists and the MCP server for subscribers