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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 | |
|---|---|---|---|---|---|---|---|
5426
PUT
Louisiana-Pacific
LPX
$5.14B
| $110K | ﹤0.01% |
+1,400
| New | +$103K |
2026 Q2
0 quarters
|
|
5427
Defiance Daily Target 2X Long SMCI ETF
SMCX
$151M
| $110K | ﹤0.01% |
12,332
+10,952
| +794% | +$160K |
2025 Q4
2 quarters
|
|
5428
CALL
MarineMax
HZO
$1.16B
| $110K | ﹤0.01% |
3,000
+800
| +36% | +$25.7K |
2017 Q3
35 quarters
|
|
5429
CALL
Lincoln Educational Services
LINC
$702M
| $110K | ﹤0.01% |
2,200
-31,200
| -93% | -$1.41M |
2025 Q2
4 quarters
|
|
5430
CALL
Broadstone Net Lease
BNL
$3.34B
| $110K | ﹤0.01% |
5,300
-4,600
| -46% | -$92.8K |
2021 Q1
21 quarters
|
|
5431
PUT
Skywest
SKYW
$3.75B
| $109K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$89K |
2026 Q1
1 quarter
|
|
5432
CALL
BRT Apartments
BRT
$250M
| $109K | ﹤0.01% |
7,100
+2,500
| +54% | +$36.2K |
2025 Q3
3 quarters
|
|
5433
CALL
inTEST
INTT
$203M
| $109K | ﹤0.01% |
6,000
+2,100
| +54% | +$35.6K |
2026 Q1
1 quarter
|
|
5434
Fomento Económico Mexicano
FMX
$42.3B
| $109K | ﹤0.01% |
852
-454
| -35% | -$54.7K |
2026 Q1
1 quarter
|
|
5435
Inspire Medical Systems
INSP
$2.06B
| $109K | ﹤0.01% |
+2,441
| New | +$116K |
2026 Q2
0 quarters
|
|
5436
Nexa Resources
NEXA
$1.59B
| $109K | ﹤0.01% |
8,895
-12,625
| -59% | -$176K |
2025 Q2
4 quarters
|
|
5437
CALL
Carlisle Companies
CSL
$14.7B
| $109K | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
|
5438
PUT
Carlisle Companies
CSL
$14.7B
| $109K | ﹤0.01% |
+300
| New | +$105K |
2026 Q2
0 quarters
|
|
5439
PUT
American Resources Corp
AREC
$136M
| $109K | ﹤0.01% |
50,600
-324,200
| -86% | -$724K |
2025 Q2
4 quarters
|
|
5440
PUT
Piper Sandler
PIPR
$4.86B
| $109K | ﹤0.01% |
1,500
-23,300
| -94% | -$1.89M |
2026 Q1
1 quarter
|
|
5441
CALL
ESAB
ESAB
$4.61B
| $108K | ﹤0.01% |
+1,100
| New | +$106K |
2026 Q2
0 quarters
|
|
5442
PUT
WEBTOON Entertainment Inc
WBTN
$1.29B
| $108K | ﹤0.01% |
9,500
+9,400
| +9,400% | +$111K |
2025 Q3
3 quarters
|
|
5443
PUT
Slide Insurance Holdings
SLDE
$3.23B
| $108K | ﹤0.01% |
5,600
-11,100
| -66% | -$201K |
2025 Q3
3 quarters
|
|
5444
PUT
NewAmsterdam Pharma
NAMS
$2.48B
| $108K | ﹤0.01% |
3,200
-400
| -11% | -$13.2K |
2024 Q4
6 quarters
|
|
5445
CALL
GoPro
GPRO
$185M
| $108K | ﹤0.01% |
139,300
+96,100
| +222% | +$102K |
2021 Q2
20 quarters
|
|
5446
PUT
Lithium Argentina AG
LAR
$730M
| $108K | ﹤0.01% |
13,100
+9,600
| +274% | +$89K |
2023 Q4
10 quarters
|
|
5447
CALL
Cogent Communications
CCOI
$397M
| $108K | ﹤0.01% |
7,800
-250,600
| -97% | -$4.62M |
2021 Q2
20 quarters
|
|
5448
PUT
LGI Homes
LGIH
$1.02B
| $108K | ﹤0.01% |
1,700
-6,500
| -79% | -$311K |
2018 Q2
32 quarters
|
|
5449
PUT
Gold.com Inc
GOLD
$1.12B
| $108K | ﹤0.01% |
2,600
+300
| +13% | +$12.9K |
2022 Q1
17 quarters
|
|
5450
CALL
IDEAYA Biosciences
IDYA
$3.17B
| $108K | ﹤0.01% |
2,900
-13,400
| -82% | -$410K |
2022 Q2
16 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.