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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
3201
Western Union
WU
$2.08B
| $671K | ﹤0.01% |
+113,734
| New | +$829K |
2026 Q3
0 quarters
|
|
3202
PUT
Praxis Precision Medicines
PRAX
$9.08B
| $670K | ﹤0.01% |
2,300
+200
| +10% | +$66.2K |
2026 Q1
2 quarters
|
|
3203
CALL
Core Natural Resources Inc
CNR
$4.16B
| $670K | ﹤0.01% |
7,800
+4,000
| +105% | +$360K |
2018 Q2
33 quarters
|
|
3204
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$327M
| $669K | ﹤0.01% |
6,400
+3,400
| +113% | +$361K |
2015 Q1
46 quarters
|
|
3205
PUT
HDFC Bank
HDB
$132B
| $668K | ﹤0.01% |
29,900
+2,400
| +9% | +$57.1K |
2016 Q3
40 quarters
|
|
3206
CALL
Smart Sand
SND
$194M
| $668K | ﹤0.01% |
130,400
+2,700
| +2% | +$13.2K |
2024 Q1
10 quarters
|
|
3207
American Exceptionalism Acquisition Corp
AEXA
$532M
| $668K | ﹤0.01% |
+59,925
| New | +$689K |
2026 Q3
0 quarters
|
|
3208
PUT
Camden Property Trust
CPT
$9.8B
| $667K | ﹤0.01% |
6,900
+6,700
| +3,350% | +$725K |
2023 Q1
14 quarters
|
|
3209
PUT
Forgent Power Solutions
FPS
$6.08B
| $666K | ﹤0.01% |
17,800
-69,200
| -80% | -$2.55M |
2026 Q1
2 quarters
|
|
3210
CALL
ChargePoint
CHPT
$324M
| $666K | ﹤0.01% |
66,100
-17,200
| -21% | -$118K |
2020 Q4
23 quarters
|
|
3211
PUT
J.M. Smucker
SJM
$14.1B
| $666K | ﹤0.01% |
5,600
-700
| -11% | -$84.2K |
2018 Q1
34 quarters
|
|
3212
PUT
Merchants Bancorp
MBIN
$2.46B
| $666K | ﹤0.01% |
13,600
-1,100
| -7% | -$57K |
2025 Q2
5 quarters
|
|
3213
Nucor
NUE
$58.7B
| $665K | ﹤0.01% |
+2,846
| New | +$711K |
2026 Q3
0 quarters
|
|
3214
Kinetik
KNTK
$4.39B
| $665K | ﹤0.01% |
+13,246
| New | +$686K |
2026 Q3
0 quarters
|
|
3215
Blackstone Mortgage Trust
BXMT
$1.8B
| $664K | ﹤0.01% |
57,996
+40,085
| +224% | +$591K |
2026 Q2
1 quarter
|
|
3216
PUT
Roper Technologies
ROP
$47.3B
| $664K | ﹤0.01% |
1,900
-700
| -27% | -$268K |
2019 Q2
29 quarters
|
|
3217
YPF Sociedad Anonima ADS
YPF
$14.6B
| $664K | ﹤0.01% |
+13,241
| New | +$676K |
2026 Q3
0 quarters
|
|
3218
FTAI Aviation
FTAI
$18.7B
| $663K | ﹤0.01% |
3,972
+3,172
| +397% | +$649K |
2026 Q1
2 quarters
|
|
3219
Silicon Motion
SIMO
$6.09B
| $663K | ﹤0.01% |
+2,369
| New | +$629K |
2026 Q3
0 quarters
|
|
3220
CALL
First Horizon
FHN
$11B
| $663K | ﹤0.01% |
28,800
-25,800
| -47% | -$644K |
2018 Q1
34 quarters
|
|
3221
PUT
Prospect Capital
PSEC
$785M
| $663K | ﹤0.01% |
318,700
-4,400
| -1% | -$9.8K |
2021 Q2
21 quarters
|
|
3222
CALL
Dauch Corp
DCH
$1.1B
| $662K | ﹤0.01% |
126,900
-560,900
| -82% | -$3.34M |
2026 Q1
2 quarters
|
|
3223
CALL
VNET Group
VNET
$881M
| $662K | ﹤0.01% |
119,200
+95,600
| +405% | +$671K |
2024 Q4
7 quarters
|
|
3224
CALL
Perpetua Resources
PPTA
$2.23B
| $660K | ﹤0.01% |
30,600
-21,000
| -41% | -$466K |
2024 Q1
10 quarters
|
|
3225
Dollar General
DG
$29.7B
| $660K | ﹤0.01% |
+5,516
| New | +$680K |
2026 Q3
0 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.