MASON STREET ADVISORS, LLC
CIK 1167711 · View on SEC EDGAR ↗
- Portfolio value
- $1.1B
- Positions
- 15
- As of
- June 30, 2026
#2,280 of 9,443 by 13F value · top 24.1%
Portfolio value QoQ: +8.5% 13F does not disclose cash
- Top 10 holdings weight
- 90.59%
- Top 25 holdings weight
- 100.00%
- Positions above 1%
- 14
- Effective number of positions
- 7.7
Based on 13F long-equity holdings only (cash, bonds, shorts not disclosed)
Turnover Q2 2026: 5.8% Est. buys $83,481,237 · sells $61,888,157
Median holding: 7.0 quarters Tracked Q4 2024–Q2 2026 · 83.3% still held
- New positions
- 1
- Increased
- 11
- Decreased
- 3
- Closed
- 1
On this page
- Sector breakdown How the portfolio splits across market sectors.
- Portfolio Every stock this institution reports holding, from its latest 13F.
- High-conviction bets The holdings this manager is most concentrated in.
- Biggest new bets Brand-new positions opened in the latest quarter.
- Top moves The biggest position increases and decreases this quarter.
- Exited positions Positions the manager fully sold out of last quarter.
Sector breakdown
Other/Unmapped
100.0%
Full portfolio 15 positions
| Type | Streak | 8Q trend | |||||
|---|---|---|---|---|---|---|---|
| AGG | $301,971,153 | 27.21% | 3,050,830 | $-729,185 | Up ×1 | ||
| IVV | $154,634,552 | 13.93% | 206,485 | $16,362,406 | Down ×1 | ||
| SPTL | $105,076,331 | 9.47% | 4,005,960 | $-90,005 | Up ×5 | ||
| SPMD | $95,872,504 | 8.64% | 1,419,072 | $3,372,700 | Down ×2 | ||
| SPSM | $79,541,232 | 7.17% | 1,379,248 | $15,448,473 | Up ×5 | ||
| RSP | $61,414,997 | 5.53% | 288,645 | $10,014,983 | Up ×4 | ||
| IEFA | $61,304,445 | 5.52% | 634,753 | $-3,062,113 | Down ×1 | ||
| RWR | $51,204,217 | 4.61% | 453,255 | $15,998,502 | Up ×1 | ||
| SCHH | $51,175,203 | 4.61% | 2,161,115 | $15,799,977 | Up ×1 | ||
| AVLV | $43,308,332 | 3.90% | 474,820 | Up ×1 | |||
| IQLT | $39,276,600 | 3.54% | 792,666 | $3,728,966 | Up ×2 | ||
| JPST | $25,017,788 | 2.25% | 494,716 | $404,323 | Up ×4 | ||
| DFIV | $22,379,676 | 2.02% | 414,285 | $1,092,710 | Up ×2 | ||
| BCI | $12,074,658 | 1.09% | 540,495 | $3,419,281 | Up ×2 | ||
| IEMG | $5,639,747 | 0.51% | 68,080 | $2,604,227 | Up ×1 | ||
| No matches | |||||||
Conviction holdings
Positions increased for 3+ consecutive quarters.
Share counts are as reported in 13F filings (not split-adjusted)
| Security | Value | % of portfolio | Streak |
|---|---|---|---|
| SPTL | $105,076,331 | 9.47% | up ×5 |
| SPSM | $79,541,232 | 7.17% | up ×5 |
| RSP | $61,414,997 | 5.53% | up ×4 |
| JPST | $25,017,788 | 2.25% | up ×4 |
Biggest new bets
New positions opened this quarter, largest first.
| Security | Value | Shares | % of portfolio |
|---|---|---|---|
| AVLV | $43,308,332 | 474,820 | 3.90% |
Top movers (QoQ)
| Security | Action | Shares Δ | Value Δ |
|---|---|---|---|
| IVV | Trimmed | -5K | +$16.4M |
| RWR | Bought more | +105K | +$16.0M |
| SCHH | Bought more | +515K | +$15.8M |
| SPSM | Bought more | +53K | +$15.4M |
| RSP | Bought more | +21K | +$10.0M |
| IQLT | Bought more | +24K | +$3.7M |
| BCI | Bought more | +184K | +$3.4M |
| SPMD | Trimmed | -143K | +$3.4M |
| IEFA | Trimmed | -76K | -$3.1M |
| IEMG | Bought more | +25K | +$2.6M |
Exited positions
Includes corporate events (mergers, delistings) — not all exits are sells
Closed positions reflect 13F reporting changes; for index managers these are often mechanical (delisting, M&A, index rebalancing), not active decisions.
| Security | Quarter | Shares before | Value before | Price since exit |
|---|---|---|---|---|
| IJR | March 31, 2026 | 639,005 | $57,165,387 | No longer tracked |
| VLUE | June 30, 2026 | 288,200 | $40,979,158 | No longer tracked |
| VLUE | Dec. 31, 2025 | 320,000 | $40,016,000 | No longer tracked |
| IJH | March 31, 2026 | 289,860 | $39,632,558 | No longer tracked |
| IJH | Sept. 30, 2025 | 98,600 | $6,115,172 | No longer tracked |
| IJR | Sept. 30, 2025 | 42,600 | $4,655,754 | No longer tracked |
| IEMG | Dec. 31, 2025 | 3,350 | $220,832 | No longer tracked |