MTRNInstitutional Flow
Period: 2026-03-31 · 26 managers with reported activity
MTRN institutional flow for the 2026-03-31 13F reporting period: 26 institutional managers filed activity, with 4 opening new positions and 13 increasing existing holdings (65% bullish). 9 reduced positions and 0 fully exited (35% bearish). FundFlow score: +0.31 — signaling institutional accumulation with 100% confidence.
FundFlow is StonkWhisper's institutional sentiment index derived from SEC 13F filings. Institutional investment managers with at least $100 million in qualifying assets under management are required to file 13F reports within 45 days of each quarter end, disclosing their long positions in U.S. equities. FundFlow aggregates these disclosures across 170+ tracked managers and produces a net conviction score for each ticker. A rising FundFlow score — especially when driven by new position opens from concentrated funds — is a leading indicator of institutional thesis formation. The interactive charts below show the full manager-level breakdown and historical flow trend for MTRN.
Quarterly Flow History
Accumulating (17)
| Manager | Action | Shares | Value |
|---|---|---|---|
| Capital World | NEW POSITION | 415K | $60.0B |
| Soros Fund | NEW POSITION | 21K | $3.1B |
| Arrowstreet | NEW POSITION | 18K | $2.7B |
| Bridgewater | NEW POSITION | 4K | $529.7M |
| American Century | INCREASED | 883K+69% | $127.7B |
| Fisher Investments | INCREASED | 442K+215% | $63.9B |
| State Street | INCREASED | 1.3M+10% | $192.1B |
| Invesco | INCREASED | 159K+191% | $23.0B |
| First Eagle | INCREASED | 102K+76% | $14.7B |
| Geode Capital | INCREASED | 74K+9% | $10.7B |
| Two Sigma | INCREASED | 6K+200% | $867.9M |
| Citadel | INCREASED | 12K+39% | $1.7B |
| Acadian | INCREASED | 4K+313% | $599K |
| Man Group | INCREASED | 4K+222% | $603.0M |
| DFA | INCREASED | 41K+3% | $5.9B |
| Gotham Asset | INCREASED | 3K+16% | $400.0M |
| ARK Invest | INCREASED | 571+1% | $82.6M |
Distributing (9)
| Manager | Action | Shares | Prev Value |
|---|---|---|---|
| Capital Research | DECREASED | 790K-58% | $114.3B |
| Segall Bryant | DECREASED | 334K-7% | $48.4B |
| Millennium | DECREASED | 15K-59% | $2.1B |
| Caxton | DECREASED | 3K-72% | $396.1M |
| Brevan Howard | DECREASED | 2K-57% | $227.7M |
| Northern Trust | DECREASED | 1K-43% | $151.0M |
| DE Shaw | DECREASED | 8K-7% | $1.2B |
| Franklin Templeton | DECREASED | 5K-6% | $780.0M |
| Neuberger Berman (Eisman) | DECREASED | 3K-8% | $371.2M |