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 | |
|---|---|---|---|---|---|---|---|
5976
CPI Aerostructures
CVU
$66.2M
| $68K | ﹤0.01% |
13,107
-8,762
| -40% | -$37.1K |
2025 Q4
2 quarters
|
|
5977
PUT
Kura Oncology
KURA
$881M
| $68K | ﹤0.01% |
6,200
-58,800
| -90% | -$555K |
2025 Q3
3 quarters
|
|
5978
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.17B
| $67.8K | ﹤0.01% |
+1,008
| New | +$67.4K |
2026 Q2
0 quarters
|
|
5979
CALL
Affiliated Managers Group
AMG
$10.1B
| $67.7K | ﹤0.01% |
+200
| New | +$62K |
2026 Q2
0 quarters
|
|
5980
WisdomTree US AI Enhanced Value Fund
AIVL
$419M
| $67.7K | ﹤0.01% |
516
+414
| +406% | +$51.5K |
2026 Q1
1 quarter
|
|
5981
PUT
Allison Transmission
ALSN
$8.89B
| $67.6K | ﹤0.01% |
600
-8,300
| -93% | -$1.01M |
2026 Q1
1 quarter
|
|
5982
CALL
Applied Industrial Technologies
AIT
$10.9B
| $67.6K | ﹤0.01% |
200
-2,000
| -91% | -$614K |
2026 Q1
1 quarter
|
|
5983
CALL
Coherus Oncology
CHRS
$165M
| $67.6K | ﹤0.01% |
48,300
+38,300
| +383% | +$62.5K |
2023 Q1
13 quarters
|
|
5984
PUT
Wabash National
WNC
$562M
| $67.5K | ﹤0.01% |
5,000
+4,400
| +733% | +$39.1K |
2025 Q4
2 quarters
|
|
5985
CALL
Sprott
SII
$2.75B
| $67.4K | ﹤0.01% |
600
-2,500
| -81% | -$327K |
2020 Q3
23 quarters
|
|
5986
PUT
Cullinan Oncology
CGEM
$955M
| $67.4K | ﹤0.01% |
3,700
-6,400
| -63% | -$95K |
2024 Q3
7 quarters
|
|
5987
CALL
ARS Pharmaceuticals
SPRY
$371M
| $67.3K | ﹤0.01% |
8,400
-24,200
| -74% | -$208K |
2022 Q1
17 quarters
|
|
5988
CALL
MNTN Inc
MNTN
$706M
| $67.2K | ﹤0.01% |
7,300
-15,900
| -69% | -$145K |
2025 Q2
4 quarters
|
|
5989
CALL
Inspire Medical Systems
INSP
$2.06B
| $66.9K | ﹤0.01% |
1,500
+100
| +7% | +$4.74K |
2021 Q1
21 quarters
|
|
5990
PUT
Alpha Pro Tech
APT
$55.5M
| $66.9K | ﹤0.01% |
11,900
+11,800
| +11,800% | +$61.7K |
2026 Q1
1 quarter
|
|
5991
CALL
DELISTED
Leggett & Platt
LEG
| $66.7K | ﹤0.01% |
5,700
-32,000
| -85% | -$337K |
2018 Q2
32 quarters
|
|
5992
Permian Basin Royalty Trust
PBT
$1.54B
| $66.7K | ﹤0.01% |
2,664
+2,149
| +417% | +$54.4K |
2024 Q4
6 quarters
|
|
5993
YieldMax Gold Miners Option Income Strategy ETF
GDXY
$273M
| $66.7K | ﹤0.01% |
6,603
-2,197
| -25% | -$27.6K |
2026 Q1
1 quarter
|
|
5994
State Street SPDR Dow Jones REIT ETF
RWR
$1.8B
| $66.7K | ﹤0.01% |
590
+159
| +37% | +$17.4K |
2026 Q1
1 quarter
|
|
5995
PUT
Bel Fuse Inc Class B
BELFB
$3.23B
| $66.6K | ﹤0.01% |
+200
| New | +$54K |
2026 Q2
0 quarters
|
|
5996
Roundhill Top WeeklyPay ETF
TOPW
$140M
| $66.4K | ﹤0.01% |
1,967
+325
| +20% | +$12K |
2025 Q3
3 quarters
|
|
5997
Global E Online
GLBE
$6.98B
| $66.4K | ﹤0.01% |
1,912
-17,205
| -90% | -$544K |
2024 Q4
6 quarters
|
|
5998
CALL
Zegna
ZGN
$3.6B
| $66.4K | ﹤0.01% |
+5,100
| New | +$65.8K |
2026 Q2
0 quarters
|
|
5999
Vanguard Short-Term Inflation-Protected Securities Index Fund
VTIP
$20.7B
| $66.3K | ﹤0.01% |
1,320
+1,285
| +3,671% | +$64.6K |
2026 Q1
1 quarter
|
|
6000
CALL
Ralliant Corp
RAL
$7.7B
| $66.3K | ﹤0.01% |
900
+300
| +50% | +$16.7K |
2026 Q1
1 quarter
|
|
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.