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 | |
|---|---|---|---|---|---|---|---|
6201
CALL
Olema Pharmaceuticals
OLMA
$608M
| $55K | ﹤0.01% |
4,400
-31,300
| -88% | -$419K |
2023 Q2
12 quarters
|
|
6202
CarParts.com
PRTS
$61.7M
| $55K | ﹤0.01% |
8,543
+2,819
| +49% | +$20.9K |
2023 Q4
10 quarters
|
|
6203
CALL
Globant
GLOB
$1.87B
| $55K | ﹤0.01% |
1,900
-3,800
| -67% | -$152K |
2018 Q3
31 quarters
|
|
6204
CALL
Castle Biosciences
CSTL
$1.03B
| $54.9K | ﹤0.01% |
2,300
-500
| -18% | -$11.1K |
2025 Q4
2 quarters
|
|
6205
CALL
Agenus
AGEN
$285M
| $54.8K | ﹤0.01% |
17,900
-13,100
| -42% | -$46.9K |
2018 Q1
33 quarters
|
|
6206
Aris Mining
ARIS
$3.27B
| $54.6K | ﹤0.01% |
+3,661
| New | +$65.8K |
2026 Q2
0 quarters
|
|
6207
Kanzhun
BZ
$7.24B
| $54.6K | ﹤0.01% |
4,239
+3,808
| +884% | +$52.2K |
2025 Q4
2 quarters
|
|
6208
DMC Global
BOOM
$111M
| $54.5K | ﹤0.01% |
9,381
+2,837
| +43% | +$18.4K |
2025 Q2
4 quarters
|
|
6209
Vita Coco
COCO
$3.19B
| $54.5K | ﹤0.01% |
824
-22,830
| -97% | -$1.54M |
2024 Q1
9 quarters
|
|
6210
PUT
Seres Therapeutics
MCRB
$19M
| $54.4K | ﹤0.01% |
6,900
-300
| -4% | -$2.28K |
2020 Q2
24 quarters
|
|
|
CFGE
6211
PUT
DELISTED
CALAMOS ETF TR FOCUS GROWTH ETF
CFGE
| $54.4K | ﹤0.01% |
2,000
-18,000
| -90% | -$490K |
2025 Q4
2 quarters
|
|
6212
CALL
BitGo Holdings
BTGO
$650M
| $54.4K | ﹤0.01% |
10,500
+10,300
| +5,150% | +$84.5K |
2026 Q1
1 quarter
|
|
6213
Cognyte Software
CGNT
$749M
| $54.4K | ﹤0.01% |
6,194
+5,309
| +600% | +$50.3K |
2022 Q2
16 quarters
|
|
6214
PUT
Gladstone Capital
GLAD
$419M
| $54.4K | ﹤0.01% |
2,800
-200
| -7% | -$3.79K |
2019 Q2
28 quarters
|
|
6215
PUT
Garrett Motion
GTX
$4.1B
| $54.3K | ﹤0.01% |
1,500
+900
| +150% | +$25K |
2026 Q1
1 quarter
|
|
6216
PUT
Tandem Diabetes Care
TNDM
$1.33B
| $54.3K | ﹤0.01% |
3,600
+2,000
| +125% | +$34.9K |
2018 Q2
32 quarters
|
|
6217
PUT
Nova
NVMI
$10.3B
| $54.3K | ﹤0.01% |
100
-300
| -75% | -$154K |
2024 Q4
6 quarters
|
|
|
FFAI
6218
CALL
Faraday Future Intelligent Electric
FFAI
$3.1M
| $54.3K | ﹤0.01% |
1,566
+1,270
| +429% | +$62.7K |
2026 Q1
1 quarter
|
|
6219
First Industrial Realty Trust
FR
$7.31B
| $54.2K | ﹤0.01% |
+884
| New | +$54.7K |
2026 Q2
0 quarters
|
|
6220
GraniteShares YieldBOOST TSLA ETF
TSYY
$58.2M
| $54.2K | ﹤0.01% |
2,317
+1,660
| +253% | +$41.4K |
2025 Q4
2 quarters
|
|
6221
Illumina
ILMN
$41.9B
| $54.2K | ﹤0.01% |
+308
| New | +$45.1K |
2026 Q2
0 quarters
|
|
6222
PUT
Park Hotels & Resorts
PK
$3.34B
| $54.2K | ﹤0.01% |
3,800
+400
| +12% | +$4.89K |
2017 Q1
37 quarters
|
|
6223
PUT
Denali Therapeutics
DNLI
$3.07B
| $54K | ﹤0.01% |
2,100
-59,000
| -97% | -$1.21M |
2025 Q2
4 quarters
|
|
6224
CALL
Wabtec
WAB
$47B
| $53.9K | ﹤0.01% |
200
-1,700
| -89% | -$449K |
2015 Q3
43 quarters
|
|
6225
CALL
Hackett Group
HCKT
$301M
| $53.8K | ﹤0.01% |
5,000
+4,900
| +4,900% | +$57.3K |
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.