DUMAC, INC.: VANGUARD INDEX FDS (VOO): Quarterly 13F Position History
As of Q1 2026, DUMAC, INC. reported 1,056,580 shares of VANGUARD INDEX FDS (VOO), worth $631.4M and representing 77.0% of its 13F equity book. Quarter-over-quarter share count change: + 312,700 (+42.0%) . The position first appeared in Q4 2025 and has been disclosed across 2 13F-HR filings in Pactolio's tracked window.
- 1,056,580Shares Held (Latest Filing)
- $631.4MReported Market Value (Latest Filing)
- 77.0%Portfolio Weight (% of 13F Equity Book)
- +312,700Quarter-over-Quarter Share Change
- +$164.8MQuarter-over-Quarter Value Change
- 1,056,580Peak Reported Shares (Historical)
Recent initiation: DUMAC, INC. first reported VOO on the Q4 2025 filing — fewer than three quarters of history are available.
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 2 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,056,580 | +312,700 | +42.0% | $631.4M | 77.0% | $597.5 |
| Q4 2025 | 743,880 | — | — | $466.5M | 71.7% | $627.1 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did DUMAC, INC. first disclose a VOO position in 13F-HR filings?
DUMAC, INC. first reported VANGUARD INDEX FDS (VOO) on its 13F-HR filing for the period ending 2025-12-31 (Q4 2025). The position has appeared on 2 reported quarters within Pactolio's tracked window.
What was DUMAC, INC.'s most recent quarter-over-quarter share-count change in VOO?
Between Q4 2025 and Q1 2026, DUMAC, INC. added 312,700 shares of VOO (+42.0%), bringing the total reported position to 1,056,580 shares at a market value of $631.4M.
Does the implied price-per-share represent DUMAC, INC.'s cost basis in VOO?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.