Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
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 | |
|---|---|---|---|---|---|---|---|
7501
CALL
Tarsus Pharmaceuticals
TARS
$3.37B
| $12.6K | ﹤0.01% |
200
+100
| +100% | +$6.39K |
2026 Q1
1 quarter
|
|
7502
PUT
Amylyx Pharmaceuticals
AMLX
$3.59B
| $12.6K | ﹤0.01% |
700
-11,200
| -94% | -$173K |
2022 Q1
17 quarters
|
|
7503
PUT
NN Inc
NNBR
$312M
| $12.6K | ﹤0.01% |
+3,500
| New | +$8.71K |
2026 Q2
0 quarters
|
|
7504
PUT
AptarGroup
ATR
$8.14B
| $12.5K | ﹤0.01% |
100
-400
| -80% | -$48.5K |
2025 Q2
4 quarters
|
|
7505
PUT
Permian Basin Royalty Trust
PBT
$1.55B
| $12.5K | ﹤0.01% |
500
| – | – |
2020 Q4
22 quarters
|
|
7506
PUT
Olema Pharmaceuticals
OLMA
$614M
| $12.5K | ﹤0.01% |
1,000
-30,200
| -97% | -$405K |
2025 Q4
2 quarters
|
|
7507
CALL
BBB Foods
TBBB
$6.94B
| $12.5K | ﹤0.01% |
300
-4,700
| -94% | -$179K |
2024 Q4
6 quarters
|
|
7508
Defiance R2000 Weekly Distribution ETF
IWMY
$83M
| $12.5K | ﹤0.01% |
+628
| New | +$12.2K |
2026 Q2
0 quarters
|
|
7509
PUT
CION Investment
CION
$322M
| $12.5K | ﹤0.01% |
2,000
-100
| -5% | -$699 |
2026 Q1
1 quarter
|
|
7510
CALL
Upstream Bio Inc
UPB
$164M
| $12.5K | ﹤0.01% |
1,800
-26,100
| -94% | -$219K |
2026 Q1
1 quarter
|
|
7511
PUT
Turtle Beach Corp
TBCH
$294M
| $12.4K | ﹤0.01% |
1,000
| – | – |
2021 Q1
21 quarters
|
|
7512
Vontier
VNT
$4.67B
| $12.4K | ﹤0.01% |
429
-340
| -44% | -$10.9K |
2026 Q1
1 quarter
|
|
7513
PUT
Black Rock Coffee Bar Inc
BRCB
$214M
| $12.4K | ﹤0.01% |
+1,500
| New | +$14.9K |
2026 Q2
0 quarters
|
|
7514
PUT
News Corp Class B
NWS
$18.3B
| $12.4K | ﹤0.01% |
+500
| New | +$14.9K |
2026 Q2
0 quarters
|
|
7515
CALL
Universal Insurance Holdings
UVE
$1.35B
| $12.4K | ﹤0.01% |
300
-1,900
| -86% | -$71.6K |
2023 Q3
11 quarters
|
|
7516
PUT
Genco Shipping & Trading
GNK
$1.09B
| $12.4K | ﹤0.01% |
+500
| New | +$12.1K |
2026 Q2
0 quarters
|
|
7517
CALL
Regional Management Corp
RM
$315M
| $12.4K | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
7518
PUT
Lakeland Financial Corp
LKFN
$1.48B
| $12.3K | ﹤0.01% |
200
| – | – |
2026 Q1
1 quarter
|
|
7519
LiveOne
LVO
$34.7M
| $12.3K | ﹤0.01% |
+1,927
| New | +$10.9K |
2026 Q2
0 quarters
|
|
7520
CALL
Cresud
CRESY
$773M
| $12.3K | ﹤0.01% |
1,100
-10,100
| -90% | -$116K |
2026 Q1
1 quarter
|
|
7521
PUT
Sensient Technologies
SXT
$5.57B
| $12.3K | ﹤0.01% |
+100
| New | +$11.1K |
2026 Q2
0 quarters
|
|
7522
VanEck Intermediate Muni ETF
ITM
$2.23B
| $12.3K | ﹤0.01% |
262
+153
| +140% | +$7.16K |
2025 Q4
2 quarters
|
|
7523
CALL
Youdao
DAO
$2.33B
| $12.3K | ﹤0.01% |
+1,000
| New | +$11.3K |
2026 Q2
0 quarters
|
|
|
7524
PUT
Youdao
DAO
$2.33B
| $12.3K | ﹤0.01% |
+1,000
| New | +$11.3K |
2026 Q2
0 quarters
|
|
7525
Enact Holdings
ACT
$6.45B
| $12.3K | ﹤0.01% |
269
+147
| +120% | +$6.28K |
2025 Q3
3 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.