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Estimated · Delayed Market context Updated Sep 16, 2026 3:50 PM CDT

Mode: Estimated (delayed ETF proxies). Trading day and shareprices are not yet updated to today (Sep 17, 2026). Latest official TSP price date: Sep 16, 2026. Showing delayed ETF proxies as an estimate until official closes post (~8:00 PM CDT). G Fund is omitted (no market ETF approximation). Order shown: F · C · S · I.

Fund Tracks / index Proxy ETF Proxy last Day change
F · F Fund
Fixed Income Index Investment Fund
Bloomberg U.S. Aggregate Bond Index AGG
iShares Core U.S. Aggregate Bond ETF
Source: yfinance
95.81 +0.01%
C · C Fund
Common Stock Index Investment Fund
S&P 500 Index SPY
SPDR S&P 500 ETF Trust
Source: yfinance
754.05 -0.55%
S · S Fund
Small Cap Stock Index Investment Fund
Dow Jones U.S. Completion Total Stock Market Index VXF
Vanguard Extended Market ETF
Source: yfinance
234.39 -0.24%
I · I Fund
International Stock Index Investment Fund
International equities (historically MSCI EAFE; broader ex-U.S. indexes may apply) EFA
iShares MSCI EAFE ETF
Source: yfinance
105.02 -0.50%

Disclaimer: Delayed market ETF day-change figures for educational context only. These are not TSP Fund share prices, not official TSP performance, and not identical to TSP benchmarks (especially S and I Fund indexes). Figures may differ materially from tsp.gov valuations and daily pricing. When official TSP closes for the current trading day are available in our database, this strip switches to Actual mode and shows TSP fund day changes instead.

Current allocations
Monthly allocation

Abysmal September for Stocks: Interest Rates & Apple Woes Take Toll - October Allocation

Allocation percentages for October 2023
F Fund 0%
C Fund 52%
S Fund 0%
I Fund 48%

Happy October and to a continuing resolution (and the official beginning of the MLB postseason!) Most of us can all breathe a sigh of relief that our paychecks will continue to be processed on time, at least until mid-November.  We can’t be happy about the performance of the stock market this month.  In a word, it was abysmal.  September is typically the worst month of the year and this September lived up to the negative hype.

 

One of the key factors behind the negative stock prices this month is bonds and their yields. 

 

For my long-term readers, you know where I stand on the Federal Reserve.  For those not well versed in my opinions, I think they play a valuable role in trying to smooth out the economy, but they are human and can only make decisions based on the data they have.  It is an amazing construct that is only just over 100 years old. The US government puts great power into people not elected by the population to drive our monetary policy, impacting much of our daily lives.  I do believe they have steered us wrong at several points, most recently with the very low interest rates for so long, but we also saw tremendous growth in personal wealth over the past decade. 

 

While finance and the economy are not zero-sum games, as some think, there is still a measure of give and take.  In an effort to put some “reserve” back into the monetary system and curb inflation, they have had to hike interest rates quite significantly over a relatively short period of time.  In doing so, investors are redirecting investment dollars into bonds versus stocks, reducing demand for stocks and increasing bond yields.  For example, a 2 Year Treasury Note is over 5% right now, higher than the 10 Year Treasury Note even.  The stock market does not like surprises and imbalance.  We saw both of those this month with an imbalance in the investors’ belief the Federal Reserve would curtail rates sooner and the Fed surprising them that they would not, at least not now. 

 

Our second major driver of the stock market this month was the disastrous month of Apple (AAPL).  In a move right out of the US playbook, China is reportedly expanding their ban on iPhones for any government related entity.  China then responded they weren't banning them, but the damage to Apple's stock remained.  Reports of their new iPhone15 overheating, do not help either (although on Saturday they seem to have found a solution so expect a bump early next week).   They make up over 7% of the S&P 500 and collapsed by almost 10%.  As one heavyweight goes so does the others.

 

Longer term, I do expect the higher interest rates to both reduce inflation, reduce GDP, and increase the unemployment number (IS-LM-FE at work).  The Federal Reserve will have to time all of this very carefully, lest they risk moving us into a recession, in an election year no less!  I’m not nearly as bullish on the next 3-9 months, but I’m also not a bear either.  I do expect the rest of the year to be flat, on average, as investors continue to wait out moves in the general economy by putting their investment dollars in bonds seeking 5% and waiting to jump in when the Fed decides everyone has had enough and signals they have met their targets.

 

Given the options we have with the TSP, I’m still strong on the C and I funds, as the companies in the S Fund are more susceptible to higher interest rates and the impacts that will accompany them.

Last 12 month TSP returns

TSP fund quotes

Latest stored share prices for context with this post. Scroll sideways on small screens.

Date L Income L 2030 L 2035 L 2040 L 2045 L 2050 L 2055 L 2060 L 2065 L 2070 L 2075 G Fund F Fund C Fund S Fund I Fund
2026-09-16 30.9516 63.1152 19.3938 74.7409 20.7723 46.2304 24.2845 24.2811 24.2775 14.3884 12.5683 20.2182 20.5873 121.8196 113.1040 64.7938
2026-09-15 30.9724 63.2041 19.4277 74.8841 20.8151 46.3321 24.3491 24.3457 24.3422 14.4267 12.6018 20.2155 20.5933 122.3618 113.4990 64.7795
Daily Change -0.07%-0.14%-0.17%-0.19%-0.21%-0.22%-0.27%-0.27%-0.27%-0.27%-0.27%0.01%-0.03%-0.44%-0.35%0.02%
Month to Date -0.47%-1.04%-1.31%-1.44%-1.56%-1.66%-1.94%-1.95%-1.95%-1.95%-1.95%0.22%-1.25%-1.67%-2.98%-2.03%
Year to Date 5.84%8.64%9.7%10.26%10.75%11.26%13.32%13.32%13.32%13.31%13.31%3.22%-1.41%11.24%12.64%16.76%
Details L Income L 2030 L 2035 L 2040 L 2045 L 2050 L 2055 L 2060 L 2065 L 2070 L 2075 G Fund F Fund C Fund S Fund I Fund

Allocation history

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