Who owns Sei Investments Company (SEIC)?
208 US mutual funds and ETFs from 100 fund families reported a position in SEIC for the quarter ending 2026-06-30. Against their own report a quarter earlier, 65 raised shares, 6 opened a new position, 103 cut and 13 sold out.
Largest fund families
| Fund family | Funds | Share of fund-held shares |
|---|---|---|
| Vanguard Index Funds | 4 | 29.0% |
| Ishares Trust | 13 | 16.3% |
| Eaton Vance Growth Trust | 1 | 9.2% |
| Loomis Sayles Funds Ii | 1 | 7.3% |
| John Hancock Funds Iii | 1 | 6.9% |
| Spdr Series Trust | 12 | 5.7% |
Tracked managers holding SEIC
None of the managers Prior Moves tracks on 13F reports SEIC in its latest filing.
Source: SEC Form N-PORT, which funds file about 60 days after quarter end, and the latest 13F filings. Share counts, not trades: a change can reflect fund inflows or outflows rather than a decision about SEIC. A record of holdings, not a forecast and not investment advice. See all owner pages or the forecast board for the names our model ranks.
Our model ranks every tracked manager’s likely next buys from 13F filings. Request the dataset sample with a work email.
The predicted next buys, fresh disclosures, and the week’s catalysts. One email a week. Honest numbers, never advice.