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Simplex Trading Portfolio holdings
AUM
$171B
Turnover
30.09%
1-Year Est. Return
85%
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
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
(+14%)
Cap. Flow
-$29.5M
Cap. Flow % of AUM
Cap. Flow %
-0.02%
Top 10 Holdings %
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487
Avg Time Held
Equity + Options
2.9
years
Top 10 Avg Time Held
Equity + Options
3.8
years
Top 20 Avg Time Held
Equity + Options
4.1
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.3
years
Top 20 Avg Time Held Equity only
0.3
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
5401
PUT
Evolent Health
EVH
$481M
| $112K | ﹤0.01% |
20,700
+17,600
| +568% | +$67.5K |
2021 Q2
20 quarters
|
|
5402
Direxion Daily Mid Cap Bull 3X ETF
MIDU
$64.1M
| $112K | ﹤0.01% |
1,498
+575
| +62% | +$37.7K |
2026 Q1
1 quarter
|
|
5403
PUT
TransAlta
TAC
$4.18B
| $112K | ﹤0.01% |
8,100
-200
| -2% | -$2.64K |
2025 Q3
3 quarters
|
|
5404
PUT
Huya Inc
HUYA
$475M
| $112K | ﹤0.01% |
48,700
+28,700
| +144% | +$81.3K |
2020 Q4
22 quarters
|
|
5405
CALL
Enterprise Financial Services Corp
EFSC
$2.24B
| $112K | ﹤0.01% |
+1,700
| New | +$102K |
2026 Q2
0 quarters
|
|
5406
CALL
Huntington Ingalls Industries
HII
$12.5B
| $112K | ﹤0.01% |
400
-7,100
| -95% | -$2.37M |
2017 Q3
35 quarters
|
|
|
5407
PUT
Huntington Ingalls Industries
HII
$12.5B
| $112K | ﹤0.01% |
400
-900
| -69% | -$301K |
2015 Q2
44 quarters
|
|
5408
CALL
American Financial Group
AFG
$12.7B
| $112K | ﹤0.01% |
800
-200
| -20% | -$26.5K |
2026 Q1
1 quarter
|
|
5409
PUT
Real REMAX Group Inc. Common Stock
REAX
$315M
| $112K | ﹤0.01% |
6,150
+5,960
| +3,137% | +$121K |
2024 Q1
9 quarters
|
|
5410
PUT
DELISTED
Qorvo
QRVO
| $112K | ﹤0.01% |
1,200
+100
| +9% | +$9.22K |
2021 Q2
20 quarters
|
|
5411
PUT
AFC Gamma
AFCG
$67.9M
| $112K | ﹤0.01% |
36,100
+22,600
| +167% | +$71K |
2025 Q3
3 quarters
|
|
5412
iShares MSCI Emerging Markets ex China ETF
EMXC
$26.1B
| $112K | ﹤0.01% |
+1,093
| New | +$103K |
2026 Q2
0 quarters
|
|
5413
PUT
Smithfield Foods
SFD
$7.31B
| $112K | ﹤0.01% |
4,600
+1,900
| +70% | +$50.8K |
2025 Q3
3 quarters
|
|
|
5414
Real REMAX Group Inc. Common Stock
REAX
$315M
| $112K | ﹤0.01% |
6,131
+5,945
| +3,196% | +$121K |
2024 Q2
8 quarters
|
|
5415
Lear
LEA
$5.79B
| $112K | ﹤0.01% |
832
+760
| +1,056% | +$102K |
2026 Q1
1 quarter
|
|
5416
HealthStream
HSTM
$1.03B
| $111K | ﹤0.01% |
+4,087
| New | +$95.7K |
2026 Q2
0 quarters
|
|
5417
CALL
Flowserve
FLS
$10.2B
| $111K | ﹤0.01% |
1,500
-200
| -12% | -$15.2K |
2016 Q2
40 quarters
|
|
5418
CALL
Central Garden & Pet Co Class A
CENTA
$2.43B
| $111K | ﹤0.01% |
2,500
| – | – |
2026 Q1
1 quarter
|
|
5419
CALL
Alto Neuroscience
ANRO
$921M
| $111K | ﹤0.01% |
+4,200
| New | +$97.1K |
2026 Q2
0 quarters
|
|
5420
PUT
Ocugen
OCGN
$252M
| $111K | ﹤0.01% |
72,400
-77,300
| -52% | -$117K |
2024 Q1
9 quarters
|
|
5421
CALL
Mueller Industries
MLI
$12.2B
| $111K | ﹤0.01% |
1,800
+200
| +13% | +$13.1K |
2021 Q2
20 quarters
|
|
5422
CALL
Cypherpunk Technologies Inc
CYPH
$357M
| $111K | ﹤0.01% |
180,700
+117,000
| +184% | +$107K |
2024 Q4
6 quarters
|
|
5423
Janux Therapeutics
JANX
$1.09B
| $110K | ﹤0.01% |
+7,192
| New | +$104K |
2026 Q2
0 quarters
|
|
5424
Pacific Biosciences
PACB
$901M
| $110K | ﹤0.01% |
65,659
-43,357
| -40% | -$63K |
2026 Q1
1 quarter
|
|
5425
Vanguard Russell 2000 ETF
VTWO
$16.9B
| $110K | ﹤0.01% |
+908
| New | +$103K |
2026 Q2
0 quarters
|
|
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Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.