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 | |
|---|---|---|---|---|---|---|---|
7901
Avantis International Equity ETF
AVDE
$19.3B
| $7.58K | ﹤0.01% |
85
+29
| +52% | +$2.6K |
2025 Q4
2 quarters
|
|
7902
CALL
AGNT Inc
AGNT
$697M
| $7.57K | ﹤0.01% |
1,400
-6,000
| -81% | -$33.1K |
2020 Q3
23 quarters
|
|
7903
PUT
LSB Industries
LXU
$703M
| $7.57K | ﹤0.01% |
700
-900
| -56% | -$12K |
2026 Q1
1 quarter
|
|
7904
CALL
Seadrill
SDRL
$3.08B
| $7.56K | ﹤0.01% |
+200
| New | +$9.32K |
2026 Q2
0 quarters
|
|
7905
GrowGeneration
GRWG
$84.3M
| $7.54K | ﹤0.01% |
5,097
+1,330
| +35% | +$1.88K |
2023 Q4
10 quarters
|
|
7906
FT Vest Gold Strategy Target Income ETF
IGLD
$571M
| $7.54K | ﹤0.01% |
+358
| New | +$8.54K |
2026 Q2
0 quarters
|
|
7907
CALL
Radian Group
RDN
$4.59B
| $7.53K | ﹤0.01% |
200
+100
| +100% | +$3.55K |
2016 Q3
39 quarters
|
|
7908
PUT
Haemonetics
HAE
$5.28B
| $7.5K | ﹤0.01% |
+100
| New | +$6.42K |
2026 Q2
0 quarters
|
|
7909
CALL
OP Bancorp
OPBK
$224M
| $7.5K | ﹤0.01% |
500
-1,600
| -76% | -$22.8K |
2024 Q4
6 quarters
|
|
7910
PUT
Kilroy Realty
KRC
$4.18B
| $7.49K | ﹤0.01% |
200
-200
| -50% | -$6.8K |
2025 Q4
2 quarters
|
|
7911
CALL
Safety Insurance
SAFT
$1.53B
| $7.49K | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
7912
CALL
Ingevity
NGVT
$2.4B
| $7.47K | ﹤0.01% |
+100
| New | +$7.2K |
2026 Q2
0 quarters
|
|
7913
Volatility Shares Trust XRP ETF
XRPI
$99.3M
| $7.47K | ﹤0.01% |
1,301
+1,173
| +916% | +$8.56K |
2025 Q3
3 quarters
|
|
7914
CALL
Liberty Latin America Class C
LILAK
$1.59B
| $7.46K | ﹤0.01% |
1,400
+410
| +41% | +$2.97K |
2026 Q1
1 quarter
|
|
7915
CALL
V2X
VVX
$2.3B
| $7.46K | ﹤0.01% |
+100
| New | +$7.44K |
2026 Q2
0 quarters
|
|
7916
DELISTED
Simulations Plus
SLP
| $7.45K | ﹤0.01% |
407
-6,525
| -94% | -$100K |
2025 Q1
5 quarters
|
|
7917
CALL
Fossil Group
FOSL
$387M
| $7.45K | ﹤0.01% |
1,800
-23,700
| -93% | -$106K |
2024 Q4
6 quarters
|
|
7918
CALL
Geospace Technologies
GEOS
$54.7M
| $7.45K | ﹤0.01% |
1,100
-1,400
| -56% | -$12.1K |
2025 Q1
5 quarters
|
|
7919
CALL
Diginex Ltd
DGNX
$36.4M
| $7.4K | ﹤0.01% |
5,000
+4,350
| +669% | +$8.98K |
2025 Q4
2 quarters
|
|
7920
Defiance Daily Target 2X Long POET ETF
POEL
$6.12M
| $7.4K | ﹤0.01% |
+352
| New | +$15K |
2026 Q2
0 quarters
|
|
7921
PUT
AIRO Group Holdings
AIRO
$151M
| $7.39K | ﹤0.01% |
1,000
-2,200
| -69% | -$17.2K |
2025 Q3
3 quarters
|
|
7922
PUT
Ralliant Corp
RAL
$7.26B
| $7.36K | ﹤0.01% |
100
-1,400
| -93% | -$78K |
2025 Q4
2 quarters
|
|
7923
iShares Lithium Miners and Producers ETF
ILIT
$10.4M
| $7.33K | ﹤0.01% |
419
-2,659
| -86% | -$52.8K |
2025 Q2
4 quarters
|
|
7924
CALL
One Liberty Properties
OLP
$490M
| $7.33K | ﹤0.01% |
300
| – | – |
2025 Q3
3 quarters
|
|
7925
IHS Holding
IHS
$2.86B
| $7.32K | ﹤0.01% |
889
-7,122
| -89% | -$58.8K |
2023 Q3
11 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.