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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 | |
|---|---|---|---|---|---|---|---|
3976
ASP Isotopes
ASPI
$259M
| $354K | ﹤0.01% |
133,504
+119,840
| +877% | +$477K |
2024 Q4
7 quarters
|
|
3977
iShares Russell 1000 ETF
IWB
$47.6B
| $354K | ﹤0.01% |
+850
| New | +$353K |
2026 Q3
0 quarters
|
|
3978
PUT
Logitech
LOGI
$14.4B
| $353K | ﹤0.01% |
3,500
-1,000
| -22% | -$101K |
2021 Q2
21 quarters
|
|
3979
CALL
Evergy
EVRG
$20.9B
| $353K | ﹤0.01% |
4,500
-3,300
| -42% | -$273K |
2019 Q1
30 quarters
|
|
3980
CALL
Murphy USA
MUSA
$9.7B
| $353K | ﹤0.01% |
700
-7,000
| -91% | -$3.91M |
2017 Q4
35 quarters
|
|
3981
CALL
Liberty Capital Corp Series C GCI Group Common Stock
GLIBK
$1.12B
| $353K | ﹤0.01% |
15,200
-14,400
| -49% | -$348K |
2025 Q4
3 quarters
|
|
3982
CALL
Solventum
SOLV
$15.1B
| $353K | ﹤0.01% |
4,000
-2,300
| -37% | -$197K |
2024 Q2
9 quarters
|
|
3983
Rio Tinto
RIO
$136B
| $352K | ﹤0.01% |
+3,742
| New | +$363K |
2026 Q3
0 quarters
|
|
3984
Gen Digital
GEN
$17.8B
| $352K | ﹤0.01% |
+15,989
| New | +$444K |
2026 Q3
0 quarters
|
|
3985
Cogent Biosciences
COGT
$5.03B
| $352K | ﹤0.01% |
10,984
+10,707
| +3,865% | +$396K |
2026 Q1
2 quarters
|
|
3986
Canada Goose Holdings
GOOS
$796M
| $352K | ﹤0.01% |
45,185
+37,134
| +461% | +$319K |
2025 Q3
4 quarters
|
|
3987
Cingulate
CING
$61.4M
| $351K | ﹤0.01% |
+70,978
| New | +$358K |
2026 Q3
0 quarters
|
|
3988
CALL
abrdn Physical Palladium Shares ETF
PALL
$526M
| $351K | ﹤0.01% |
16,100
-33,100
| -67% | -$783K |
2025 Q1
6 quarters
|
|
3989
T-Rex 2X Long MSTR Daily Target ETF
MSTU
$376M
| $351K | ﹤0.01% |
+8,824
| New | +$231K |
2026 Q3
0 quarters
|
|
3990
Viper Energy
VNOM
$8.12B
| $351K | ﹤0.01% |
+8,795
| New | +$380K |
2026 Q3
0 quarters
|
|
3991
CALL
Loar Holdings
LOAR
$7.08B
| $351K | ﹤0.01% |
5,700
+400
| +8% | +$28.2K |
2024 Q2
9 quarters
|
|
3992
PUT
Tyler Technologies
TYL
$17B
| $350K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$330K |
2024 Q4
7 quarters
|
|
3993
Aramark
ARMK
$14.1B
| $350K | ﹤0.01% |
+6,532
| New | +$375K |
2026 Q3
0 quarters
|
|
3994
PUT
Pentair
PNR
$10.9B
| $350K | ﹤0.01% |
6,600
-1,600
| -20% | -$102K |
2015 Q3
44 quarters
|
|
3995
Rhythm Pharmaceuticals
RYTM
$7.63B
| $349K | ﹤0.01% |
3,669
+234
| +7% | +$25K |
2026 Q2
1 quarter
|
|
3996
PUT
Marex Group Limited Ordinary Shares
MRX
$5.12B
| $349K | ﹤0.01% |
+5,000
| New | +$344K |
2026 Q3
0 quarters
|
|
3997
CALL
Nurix Therapeutics
NRIX
$1.69B
| $349K | ﹤0.01% |
14,700
-30,200
| -67% | -$753K |
2022 Q3
16 quarters
|
|
3998
CALL
Alliant Energy
LNT
$19.1B
| $348K | ﹤0.01% |
5,500
-8,200
| -60% | -$575K |
2018 Q2
33 quarters
|
|
3999
Jumia Technologies
JMIA
$714M
| $347K | ﹤0.01% |
52,226
+6,210
| +13% | +$41.3K |
2020 Q2
25 quarters
|
|
4000
PUT
CMS Energy
CMS
$22.1B
| $347K | ﹤0.01% |
5,500
+4,300
| +358% | +$302K |
2026 Q2
1 quarter
|
|
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.