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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 | |
|---|---|---|---|---|---|---|---|
5551
CALL
Cognyte Software
CGNT
$723M
| $99.2K | ﹤0.01% |
11,300
+4,600
| +69% | +$43.6K |
2022 Q3
15 quarters
|
|
5552
Clarus
CLAR
$172M
| $99.2K | ﹤0.01% |
31,483
+18,414
| +141% | +$53K |
2024 Q3
7 quarters
|
|
5553
PUT
American States Water
AWR
$3.38B
| $99.2K | ﹤0.01% |
1,200
+300
| +33% | +$23.3K |
2025 Q3
3 quarters
|
|
5554
PUT
Equillium
EQ
$111M
| $98.9K | ﹤0.01% |
30,900
-15,900
| -34% | -$38.1K |
2024 Q4
6 quarters
|
|
5555
PUT
ITT
ITT
$18.1B
| $98.9K | ﹤0.01% |
500
+100
| +25% | +$20.2K |
2025 Q3
3 quarters
|
|
5556
Moog Inc Class A
MOG.A
$11.5B
| $98.8K | ﹤0.01% |
233
-19,634
| -99% | -$6.7M |
2025 Q3
3 quarters
|
|
5557
CALL
TaskUs
TASK
$744M
| $98.7K | ﹤0.01% |
21,100
+5,900
| +39% | +$35.8K |
2025 Q1
5 quarters
|
|
5558
PUT
Medifast
MED
$137M
| $98.7K | ﹤0.01% |
+9,300
| New | +$107K |
2026 Q2
0 quarters
|
|
5559
CALL
Camping World
CWH
$320M
| $98.4K | ﹤0.01% |
12,900
-8,800
| -41% | -$63.8K |
2017 Q2
36 quarters
|
|
5560
PUT
Dynex Capital
DX
$2.83B
| $98.3K | ﹤0.01% |
7,500
-17,900
| -70% | -$235K |
2020 Q2
24 quarters
|
|
5561
CMS Energy
CMS
$21.8B
| $98.3K | ﹤0.01% |
1,285
+181
| +16% | +$13.6K |
2025 Q3
3 quarters
|
|
5562
Descartes Systems
DSGX
$7.87B
| $98.3K | ﹤0.01% |
1,419
+861
| +154% | +$61.5K |
2025 Q3
3 quarters
|
|
5563
VanEck ChiNext Innovators ETF
CNXT
$65.1M
| $98.2K | ﹤0.01% |
1,573
+1,244
| +378% | +$67.8K |
2025 Q3
3 quarters
|
|
5564
Tradr 2X Long APLD Daily ETF
APLX
$23M
| $98.1K | ﹤0.01% |
+4,750
| New | +$120K |
2026 Q2
0 quarters
|
|
5565
PUT
Sixth Street Specialty
TSLX
$1.68B
| $97.9K | ﹤0.01% |
5,700
-1,700
| -23% | -$30.3K |
2026 Q1
1 quarter
|
|
5566
CALL
Rigel Pharmaceuticals
RIGL
$961M
| $97.8K | ﹤0.01% |
2,500
-9,300
| -79% | -$287K |
2017 Q4
34 quarters
|
|
5567
EnerSys
ENS
$6.18B
| $97.7K | ﹤0.01% |
418
+98
| +31% | +$21.3K |
2025 Q3
3 quarters
|
|
5568
PUT
BlackSky Technology
BKSY
$786M
| $97.7K | ﹤0.01% |
3,500
+700
| +25% | +$25.3K |
2021 Q4
18 quarters
|
|
5569
CALL
Pricesmart
PSMT
$5.11B
| $97.7K | ﹤0.01% |
500
-300
| -38% | -$50K |
2026 Q1
1 quarter
|
|
5570
CALL
Spyre Therapeutics
SYRE
$9.25B
| $97.7K | ﹤0.01% |
+1,100
| New | +$80.3K |
2026 Q2
0 quarters
|
|
5571
Amtech Systems
ASYS
$240M
| $97.6K | ﹤0.01% |
+4,230
| New | +$80.3K |
2026 Q2
0 quarters
|
|
5572
CALL
Griffon
GFF
$4.66B
| $97.5K | ﹤0.01% |
+1,000
| New | +$87.2K |
2026 Q2
0 quarters
|
|
5573
CALL
Cheniere Energy
CQP
$32.3B
| $97.5K | ﹤0.01% |
1,600
+200
| +14% | +$12.6K |
2018 Q2
32 quarters
|
|
5574
ProShares Ultra Yen
YCL
$29.9M
| $97.4K | ﹤0.01% |
5,608
+2,870
| +105% | +$52K |
2025 Q1
5 quarters
|
|
5575
PUT
Terra Innovatum Global N.V.
NKLR
$257M
| $97.4K | ﹤0.01% |
19,800
+18,800
| +1,880% | +$106K |
2025 Q4
2 quarters
|
|
Similar funds
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.