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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 | |
|---|---|---|---|---|---|---|---|
2076
Maplebear
CART
$13.9B
| $1.86M | ﹤0.01% |
+43,138
| New | +$2.04M |
2026 Q3
0 quarters
|
|
2077
PUT
Domino's
DPZ
$10.8B
| $1.86M | ﹤0.01% |
6,200
-7,600
| -55% | -$2.49M |
2021 Q2
21 quarters
|
|
2078
CALL
Mistras Group
MG
$643M
| $1.86M | ﹤0.01% |
88,200
+83,000
| +1,596% | +$1.49M |
2025 Q1
6 quarters
|
|
2079
CALL
Pultegroup
PHM
$24.7B
| $1.86M | ﹤0.01% |
16,000
-4,200
| -21% | -$528K |
2014 Q4
47 quarters
|
|
2080
CALL
Celldex Therapeutics
CLDX
$2.37B
| $1.85M | ﹤0.01% |
57,200
+44,000
| +333% | +$1.68M |
2026 Q1
2 quarters
|
|
2081
PUT
Victoria's Secret
VSXY
$8.76B
| $1.85M | ﹤0.01% |
20,900
+5,600
| +37% | +$471K |
2021 Q4
19 quarters
|
|
2082
PUT
Ferguson
FERG
$51.2B
| $1.85M | ﹤0.01% |
8,300
+500
| +6% | +$116K |
2022 Q2
17 quarters
|
|
2083
Nordson
NDSN
$18.3B
| $1.85M | ﹤0.01% |
+5,628
| New | +$1.74M |
2026 Q3
0 quarters
|
|
2084
CALL
BCE
BCE
$20.1B
| $1.84M | ﹤0.01% |
90,700
-11,600
| -11% | -$259K |
2018 Q1
34 quarters
|
|
2085
PUT
CAVA Group
CAVA
$6.99B
| $1.84M | ﹤0.01% |
34,100
-18,300
| -35% | -$1.16M |
2023 Q2
13 quarters
|
|
2086
PUT
nVent Electric
NVT
$18.9B
| $1.84M | ﹤0.01% |
11,500
+7,000
| +156% | +$1.1M |
2023 Q3
12 quarters
|
|
2087
Corcept Therapeutics
CORT
$8.06B
| $1.84M | ﹤0.01% |
16,001
-1,165
| -7% | -$125K |
2025 Q4
3 quarters
|
|
2088
DELISTED
Warner Bros
WBD
| $1.84M | ﹤0.01% |
59,403
+48,882
| +465% | +$1.35M |
2026 Q2
1 quarter
|
|
2089
iShares MSCI Mexico ETF
EWW
$1.69B
| $1.84M | ﹤0.01% |
25,857
+9,203
| +55% | +$694K |
2025 Q3
4 quarters
|
|
2090
PUT
Compass Pathways
CMPS
$1.32B
| $1.84M | ﹤0.01% |
147,700
+128,600
| +673% | +$1.71M |
2020 Q4
23 quarters
|
|
2091
CALL
Digital Turbine
APPS
$945M
| $1.84M | ﹤0.01% |
165,400
+40,000
| +32% | +$433K |
2021 Q2
21 quarters
|
|
2092
Argan
AGX
$4.52B
| $1.84M | ﹤0.01% |
+4,857
| New | +$2.5M |
2026 Q3
0 quarters
|
|
2093
PUT
ING
ING
$95B
| $1.84M | ﹤0.01% |
51,700
+44,700
| +639% | +$1.56M |
2018 Q1
34 quarters
|
|
2094
PUT
Antero Resources
AR
$11.7B
| $1.83M | ﹤0.01% |
54,900
+4,800
| +10% | +$173K |
2014 Q4
47 quarters
|
|
2095
PUT
Zebra Technologies
ZBRA
$15.4B
| $1.83M | ﹤0.01% |
4,900
+900
| +23% | +$296K |
2026 Q1
2 quarters
|
|
2096
PUT
Goldman Sachs Access US Aggregate Bond ETF
GCOR
$811M
| $1.83M | ﹤0.01% |
31,900
+2,600
| +9% | +$105K |
2025 Q2
5 quarters
|
|
2097
MSCI
MSCI
$48.1B
| $1.83M | ﹤0.01% |
3,392
+1,537
| +83% | +$879K |
2025 Q3
4 quarters
|
|
2098
PUT
Marsh
MRSH
$98.7B
| $1.83M | ﹤0.01% |
10,700
+10,500
| +5,250% | +$1.92M |
2017 Q2
37 quarters
|
|
2099
PUT
10x Genomics
TXG
$8.16B
| $1.83M | ﹤0.01% |
20,200
+13,400
| +197% | +$784K |
2022 Q1
18 quarters
|
|
2100
CALL
Vanguard Short-Term Treasury ETF
VGSH
$36.6B
| $1.82M | ﹤0.01% |
29,000
-16,500
| -36% | -$956K |
2020 Q2
25 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.