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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 | |
|---|---|---|---|---|---|---|---|
3051
PUT
BILL Holdings
BILL
$4.64B
| $766K | ﹤0.01% |
18,000
-43,900
| -71% | -$2.02M |
2020 Q1
26 quarters
|
|
3052
PUT
Mid-America Apartment Communities
MAA
$13.5B
| $765K | ﹤0.01% |
6,500
-3,900
| -38% | -$508K |
2019 Q2
29 quarters
|
|
3053
Neogen
NEOG
$2.44B
| $765K | ﹤0.01% |
59,739
+54,047
| +950% | +$613K |
2026 Q1
2 quarters
|
|
3054
CALL
Arcus Biosciences
RCUS
$2.56B
| $765K | ﹤0.01% |
29,600
-19,500
| -40% | -$550K |
2020 Q2
25 quarters
|
|
3055
PUT
Vanguard FTSE Europe ETF
VGK
$30B
| $764K | ﹤0.01% |
7,900
-13,700
| -63% | -$1.23M |
2026 Q1
2 quarters
|
|
3056
PUT
Dolby
DLB
$6.05B
| $764K | ﹤0.01% |
13,000
+12,500
| +2,500% | +$720K |
2025 Q2
5 quarters
|
|
3057
PUT
Jones Lang LaSalle
JLL
$16.7B
| $764K | ﹤0.01% |
2,500
+2,300
| +1,150% | +$798K |
2023 Q1
14 quarters
|
|
3058
CVR Energy
CVI
$4.56B
| $763K | ﹤0.01% |
14,960
-199
| -1% | -$7.84K |
2026 Q2
1 quarter
|
|
3059
CALL
PVH
PVH
$4.28B
| $763K | ﹤0.01% |
10,300
+3,700
| +56% | +$289K |
2021 Q2
21 quarters
|
|
3060
Sable Offshore Corp
SOC
$129M
| $763K | ﹤0.01% |
+220,418
| New | +$983K |
2026 Q3
0 quarters
|
|
3061
PUT
Invesco DB US Dollar Index Bullish Fund
UUP
$488M
| $762K | ﹤0.01% |
26,500
+600
| +2% | +$17K |
2018 Q2
33 quarters
|
|
3062
CALL
Ezcorp Inc
EZPW
$1.66B
| $762K | ﹤0.01% |
25,600
+4,000
| +19% | +$126K |
2023 Q3
12 quarters
|
|
3063
Archer Aviation
ACHR
$3.39B
| $762K | ﹤0.01% |
153,276
-52,080
| -25% | -$283K |
2024 Q4
7 quarters
|
|
3064
CALL
Pursuit Attractions and Hospitality Inc
PRSU
$1.47B
| $761K | ﹤0.01% |
15,300
+100
| +0.7% | +$5K |
2026 Q2
1 quarter
|
|
3065
CALL
Victoria's Secret
VSXY
$8.35B
| $761K | ﹤0.01% |
8,600
-11,100
| -56% | -$934K |
2021 Q4
19 quarters
|
|
3066
FormFactor
FORM
$7.22B
| $760K | ﹤0.01% |
5,087
+37
| +0.7% | +$4.23K |
2026 Q1
2 quarters
|
|
3067
PUT
Eldorado Gold
EGO
$8.31B
| $758K | ﹤0.01% |
19,700
-2,600
| -12% | -$98.5K |
2015 Q1
46 quarters
|
|
3068
Genesis Energy
GEL
$1.55B
| $757K | ﹤0.01% |
55,050
+26,667
| +94% | +$406K |
2025 Q3
4 quarters
|
|
3069
CALL
Iridium Communications
IRDM
$4.89B
| $757K | ﹤0.01% |
15,800
-23,100
| -59% | -$1.11M |
2017 Q1
38 quarters
|
|
3070
CALL
State Street Multi-Asset Real Return ETF
RLY
$1.39B
| $755K | ﹤0.01% |
18,700
+1,400
| +8% | +$51.2K |
2025 Q4
3 quarters
|
|
3071
CALL
Beta Technologies Inc
BETA
$5.91B
| $754K | ﹤0.01% |
34,100
-26,200
| -43% | -$549K |
2025 Q4
3 quarters
|
|
3072
PUT
American Healthcare REIT
AHR
$13.6B
| $754K | ﹤0.01% |
14,700
+14,100
| +2,350% | +$772K |
2026 Q1
2 quarters
|
|
3073
PUT
HawkEye 360 Inc
HAWK
$1.44B
| $753K | ﹤0.01% |
49,900
+37,800
| +312% | +$740K |
2026 Q2
1 quarter
|
|
3074
PUT
Lithium Argentina AG
LAR
$612M
| $753K | ﹤0.01% |
136,900
+123,800
| +945% | +$799K |
2023 Q4
11 quarters
|
|
3075
CALL
DT Midstream
DTM
$12.2B
| $753K | ﹤0.01% |
6,300
-9,000
| -59% | -$1.21M |
2021 Q4
19 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.