Federal employees and retirees tracking their Thrift Savings Plan (TSP) balances saw red across most of the stock-based funds during the holiday-shortened week of September 7-11, 2026. Rising oil prices, escalating Middle East tensions and concerns about persistent inflation weighed on markets during the week, leaving most stock-based TSP funds lower despite a Friday rebound.
What Drove the Week
Markets were closed Monday, September 7, for Labor Day, compressing the trading week to four sessions. Stocks fell to open the week on Tuesday as investors weighed escalating tensions in the Middle East and a sixth straight day of rising oil prices, the longest such streak since March. The pressure carried into midweek as traders braced for Friday’s inflation report.
That report arrived Friday morning: August inflation came in hotter than expected on an underlying basis. The Consumer Price Index (CPI) climbed 0.4% for the month — a jump from July’s more modest 0.1% gain — and core prices, which strip out food and energy, rose 0.3%, ahead of the 0.2% forecast. The inflation data strengthened expectations that the Federal Reserve could raise interest rates at its September meeting, keeping Treasury yields elevated and adding another concern for markets already dealing with higher oil prices.
Stocks nevertheless rebounded Friday as oil prices retreated from their highs, with the major U.S. indexes finishing the session higher. The rebound wasn’t enough to erase losses accumulated earlier in the holiday-shortened week, leaving most stock-based TSP funds lower overall.
Core Funds Performance
| Fund | Price (9/11) | Weekly Change | YTD Change |
|---|---|---|---|
| G Fund | $20.2046 | +0.09% | +3.15% |
| F Fund | $20.6154 | -1.03% | -1.28% |
| C Fund | $123.4852 | -0.78% | +12.76% |
| S Fund | $114.8158 | -2.05% | +14.35% |
| I Fund | $65.9683 | -1.09% | +18.88% |
The S Fund, which tracks smaller domestic companies, posted the week’s steepest decline. Smaller companies can be particularly sensitive to higher borrowing costs, making the week’s rise in Treasury yields and expectations for tighter monetary policy an added headwind. The G Fund’s small gain reflects its daily interest accrual on government securities and is not driven by stock market movements.
Lifecycle Funds Performance
| Fund | Price (9/11) | Weekly Change | YTD Change |
|---|---|---|---|
| L Income | $31.0724 | -0.29% | +6.25% |
| L 2030 | $63.6253 | -0.59% | +9.51% |
| L 2035 | $19.5881 | -0.73% | +10.80% |
| L 2040 | $75.5604 | -0.80% | +11.47% |
| L 2045 | $21.0170 | -0.86% | +12.05% |
| L 2050 | $46.8123 | -0.92% | +12.66% |
| L 2055 | $24.6549 | -1.04% | +15.05% |
| L 2060 | $24.6514 | -1.04% | +15.05% |
| L 2065 | $24.6479 | -1.04% | +15.05% |
| L 2070 | $14.6079 | -1.04% | +15.04% |
| L 2075 | $12.7601 | -1.04% | +15.04% |
As expected, the later-dated Lifecycle Funds, which hold larger allocations to stocks, moved closer in line with the C, S and I Funds, while L Income held up better thanks to its heavier weighting toward the G and F Funds.
Looking Ahead
With the Federal Reserve’s next rate decision approaching and inflation still running above target, the coming week will put renewed attention on interest rates, Treasury yields and how markets respond to the Fed’s decision. The TSP returns page tracks month-by-month performance for those looking at the bigger picture, and the Office of Personnel Management’s retirement center has additional resources on federal retirement planning.