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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 | |
|---|---|---|---|---|---|---|---|
2151
CALL
Jacobs Solutions
J
$18.4B
| $1.76M | ﹤0.01% |
13,000
+9,000
| +225% | +$1.26M |
2017 Q3
36 quarters
|
|
2152
PUT
CarMax
KMX
$7.65B
| $1.76M | ﹤0.01% |
31,900
-20,600
| -39% | -$1.2M |
2021 Q2
21 quarters
|
|
2153
CALL
Corteva
CTVA
$8.1B
| $1.75M | ﹤0.01% |
22,600
+15,700
| +228% | +$1.3M |
2019 Q2
29 quarters
|
|
2154
PUT
Navios Maritime Partners
NMM
$2.55B
| $1.75M | ﹤0.01% |
19,500
+3,700
| +23% | +$308K |
2026 Q1
2 quarters
|
|
2155
Bunge Global
BG
$19.3B
| $1.75M | ﹤0.01% |
16,373
-5,008
| -23% | -$573K |
2025 Q2
5 quarters
|
|
2156
ON Semiconductor
ON
$28.7B
| $1.75M | ﹤0.01% |
22,773
-13,916
| -38% | -$1.12M |
2026 Q2
1 quarter
|
|
2157
CALL
Consolidated Edison
ED
$44.2B
| $1.75M | ﹤0.01% |
17,100
+8,800
| +106% | +$953K |
2014 Q4
47 quarters
|
|
2158
CALL
Uranium Royalty Corp
UROY
$1.14B
| $1.75M | ﹤0.01% |
432,300
+6,400
| +2% | +$24K |
2021 Q4
19 quarters
|
|
2159
CALL
Trekor Metals
TGB
$2.64B
| $1.75M | ﹤0.01% |
195,900
+25,200
| +15% | +$204K |
2021 Q4
19 quarters
|
|
2160
PUT
Pharvaris
PHVS
$2.4B
| $1.74M | ﹤0.01% |
55,000
+50,800
| +1,210% | +$1.78M |
2025 Q4
3 quarters
|
|
2161
PUT
Greif
GEF
$4.12B
| $1.74M | ﹤0.01% |
+21,900
| New | +$1.8M |
2026 Q3
0 quarters
|
|
2162
PUT
FS KKR Capital
FSK
$3.25B
| $1.74M | ﹤0.01% |
158,400
+25,600
| +19% | +$294K |
2022 Q4
15 quarters
|
|
2163
CALL
Hinge Health
HNGE
$9.8B
| $1.74M | ﹤0.01% |
17,900
-2,100
| -11% | -$184K |
2025 Q2
5 quarters
|
|
2164
CALL
Toyota
TM
$251B
| $1.74M | ﹤0.01% |
9,500
| – | – |
2014 Q4
47 quarters
|
|
2165
PUT
Penguin Solutions Inc
PENG
$2.52B
| $1.74M | ﹤0.01% |
31,800
-114,800
| -78% | -$6.51M |
2018 Q2
33 quarters
|
|
2166
CALL
BJs Wholesale Club
BJ
$14B
| $1.74M | ﹤0.01% |
18,900
-1,900
| -9% | -$176K |
2018 Q3
32 quarters
|
|
2167
iShares MSCI USA Momentum Factor ETF
MTUM
$17.2B
| $1.74M | ﹤0.01% |
21,896
-17,976
| -45% | -$1.39M |
2026 Q2
1 quarter
|
|
2168
PUT
Huntington Ingalls Industries
HII
$12.4B
| $1.74M | ﹤0.01% |
6,500
+6,100
| +1,525% | +$1.78M |
2015 Q2
45 quarters
|
|
2169
PUT
Target Hospitality
TH
$1.16B
| $1.73M | ﹤0.01% |
87,700
-310,400
| -78% | -$5.54M |
2021 Q4
19 quarters
|
|
2170
Liberty Global Class C
LBTYK
$3.47B
| $1.73M | ﹤0.01% |
194,516
+141,467
| +267% | +$1.44M |
2026 Q1
2 quarters
|
|
2171
CALL
Jefferies Financial Group
JEF
$11B
| $1.73M | ﹤0.01% |
37,800
-20,200
| -35% | -$1.07M |
2016 Q1
42 quarters
|
|
2172
Regions Financial
RF
$24.3B
| $1.73M | ﹤0.01% |
+64,286
| New | +$1.95M |
2026 Q3
0 quarters
|
|
2173
CALL
Medical Properties Trust
MPT
$1.05B
| $1.73M | ﹤0.01% |
499,100
+92,300
| +23% | +$388K |
2016 Q1
42 quarters
|
|
2174
CALL
Amentum Holdings
AMTM
$5.56B
| $1.73M | ﹤0.01% |
95,300
+49,800
| +109% | +$1.04M |
2024 Q4
7 quarters
|
|
2175
PUT
Landstar System
LSTR
$4.97B
| $1.72M | ﹤0.01% |
10,200
+9,300
| +1,033% | +$1.72M |
2025 Q2
5 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.