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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 | |
|---|---|---|---|---|---|---|---|
2051
ARK 21Shares Bitcoin ETF
ARKB
$2.84B
| $1.89M | ﹤0.01% |
68,297
+59,843
| +708% | +$1.41M |
2026 Q2
1 quarter
|
|
2052
CALL
GoDaddy
GDDY
$13.8B
| $1.89M | ﹤0.01% |
19,800
+3,900
| +25% | +$371K |
2015 Q2
45 quarters
|
|
2053
PUT
Advance Auto Parts
AAP
$2.76B
| $1.89M | ﹤0.01% |
48,600
-8,800
| -15% | -$440K |
2021 Q2
21 quarters
|
|
2054
Madrigal Pharmaceuticals
MDGL
$10.1B
| $1.89M | ﹤0.01% |
+3,751
| New | +$1.98M |
2026 Q3
0 quarters
|
|
2055
CALL
Fortuna Silver Mines
FSM
$2.8B
| $1.89M | ﹤0.01% |
168,000
-32,000
| -16% | -$333K |
2018 Q2
33 quarters
|
|
2056
Rubrik
RBRK
$22.7B
| $1.89M | ﹤0.01% |
16,479
-12,805
| -44% | -$1.18M |
2026 Q2
1 quarter
|
|
2057
CALL
WEC Energy
WEC
$38.6B
| $1.88M | ﹤0.01% |
18,700
+6,400
| +52% | +$697K |
2017 Q4
35 quarters
|
|
2058
Aflac
AFL
$62.9B
| $1.88M | ﹤0.01% |
+16,796
| New | +$2.01M |
2026 Q3
0 quarters
|
|
2059
Public Storage
PSA
$62.7B
| $1.88M | ﹤0.01% |
6,637
+311
| +5% | +$97.3K |
2025 Q4
3 quarters
|
|
2060
CALL
Steven Madden
SHOO
$3.13B
| $1.88M | ﹤0.01% |
41,900
+37,700
| +898% | +$1.66M |
2025 Q1
6 quarters
|
|
2061
CALL
The Ensign Group
ENSG
$10.9B
| $1.87M | ﹤0.01% |
+10,900
| New | +$1.91M |
2026 Q3
0 quarters
|
|
2062
The Mosaic Company
MOS
$7.25B
| $1.87M | ﹤0.01% |
86,589
-98,541
| -53% | -$2.29M |
2026 Q1
2 quarters
|
|
2063
PUT
Mistras Group
MG
$643M
| $1.87M | ﹤0.01% |
89,000
+54,300
| +156% | +$975K |
2024 Q4
7 quarters
|
|
2064
CALL
IAMGOLD
IAG
$10.2B
| $1.87M | ﹤0.01% |
101,800
-35,700
| -26% | -$638K |
2018 Q2
33 quarters
|
|
2065
Noble Corp
NE
$6.74B
| $1.87M | ﹤0.01% |
44,897
+7,918
| +21% | +$342K |
2024 Q4
7 quarters
|
|
2066
PUT
CRH
CRH
$64B
| $1.87M | ﹤0.01% |
22,600
-22,400
| -50% | -$2.15M |
2023 Q2
13 quarters
|
|
2067
PUT
Nice
NICE
$5.41B
| $1.87M | ﹤0.01% |
16,800
+3,400
| +25% | +$347K |
2018 Q2
33 quarters
|
|
2068
CALL
WIX.com
WIX
$2.86B
| $1.87M | ﹤0.01% |
25,900
-38,000
| -59% | -$2.59M |
2016 Q3
40 quarters
|
|
2069
PUT
Vanguard Short-Term Treasury ETF
VGSH
$36.6B
| $1.87M | ﹤0.01% |
24,000
+17,600
| +275% | +$1.02M |
2020 Q4
23 quarters
|
|
2070
Revolve Group
RVLV
$1.41B
| $1.87M | ﹤0.01% |
+87,486
| New | +$2.03M |
2026 Q3
0 quarters
|
|
2071
CALL
Alpha and Omega Semiconductor
AOSL
$936M
| $1.86M | ﹤0.01% |
67,800
+36,800
| +119% | +$1.1M |
2020 Q3
24 quarters
|
|
2072
CALL
Garmin
GRMN
$56.6B
| $1.86M | ﹤0.01% |
6,500
+5,800
| +829% | +$1.61M |
2015 Q1
46 quarters
|
|
2073
CALL
eToro Group
ETOR
$1.83B
| $1.86M | ﹤0.01% |
72,500
-31,500
| -30% | -$1.04M |
2025 Q2
5 quarters
|
|
2074
PUT
G-III Apparel Group
GIII
$1.37B
| $1.86M | ﹤0.01% |
68,700
+68,000
| +9,714% | +$2.2M |
2015 Q3
44 quarters
|
|
2075
CALL
CNH Industrial
CNH
$20.1B
| $1.86M | ﹤0.01% |
144,800
+59,100
| +69% | +$691K |
2019 Q3
28 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.