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 | |
|---|---|---|---|---|---|---|---|
7451
ProShares Ultra Dow30
DDM
$522M
| $13.3K | ﹤0.01% |
+203
| New | +$12.2K |
2026 Q2
0 quarters
|
|
|
WSR
7452
CALL
DELISTED
Whitestone REIT
WSR
| $13.3K | ﹤0.01% |
700
-500
| -42% | -$9.39K |
2018 Q2
32 quarters
|
|
7453
PUT
Hartford Financial Services
HIG
$37.8B
| $13.3K | ﹤0.01% |
+100
| New | +$13.4K |
2026 Q2
0 quarters
|
|
7454
PUT
Vir Biotechnology
VIR
$1.76B
| $13.2K | ﹤0.01% |
1,300
-27,700
| -96% | -$264K |
2021 Q1
21 quarters
|
|
7455
YieldMax Innovation Option Income Strategy ETF
OARK
$28.8M
| $13.2K | ﹤0.01% |
422
+174
| +70% | +$5.53K |
2024 Q3
7 quarters
|
|
|
NVA
7456
PUT
Nova Minerals Corp
NVA
$117M
| $13.2K | ﹤0.01% |
2,800
+1,300
| +87% | +$7.88K |
2026 Q1
1 quarter
|
|
7457
PUT
Coherus Oncology
CHRS
$162M
| $13.2K | ﹤0.01% |
9,400
| – | – |
2021 Q2
20 quarters
|
|
7458
PUT
Incannex Healthcare Limited Common Stock
IXHL
$32.6M
| $13.2K | ﹤0.01% |
+3,500
| New | +$12.8K |
2026 Q2
0 quarters
|
|
7459
PUT
Digimarc Corp
DMRC
$162M
| $13.2K | ﹤0.01% |
+1,600
| New | +$15K |
2026 Q2
0 quarters
|
|
7460
CALL
Farmers National Banc Corp
FMNB
$928M
| $13.1K | ﹤0.01% |
900
-1,000
| -53% | -$14.1K |
2026 Q1
1 quarter
|
|
7461
Fate Therapeutics
FATE
$250M
| $13.1K | ﹤0.01% |
4,866
-11,570
| -70% | -$21.4K |
2025 Q4
2 quarters
|
|
7462
CALL
BGSF Inc
BGSF
$44.5M
| $13.1K | ﹤0.01% |
2,300
+1,800
| +360% | +$10K |
2025 Q2
4 quarters
|
|
7463
CALL
Contineum Therapeutics
CTNM
$316M
| $13.1K | ﹤0.01% |
+800
| New | +$10.5K |
2026 Q2
0 quarters
|
|
7464
Harmony Biosciences
HRMY
$2.1B
| $13.1K | ﹤0.01% |
+360
| New | +$11.4K |
2026 Q2
0 quarters
|
|
7465
Invesco Financial Preferred ETF
PGF
$594M
| $13.1K | ﹤0.01% |
954
+76
| +9% | +$1.06K |
2026 Q1
1 quarter
|
|
7466
Vanguard Morningstar Large-Cap ETF
VV
$53.9B
| $13.1K | ﹤0.01% |
+38
| New | +$12.7K |
2026 Q2
0 quarters
|
|
7467
Landstar System
LSTR
$5.75B
| $13K | ﹤0.01% |
63
-306
| -83% | -$58.5K |
2025 Q4
2 quarters
|
|
7468
Fulgent Genetics
FLGT
$550M
| $13K | ﹤0.01% |
+633
| New | +$10.7K |
2026 Q2
0 quarters
|
|
7469
Ambiq Micro
AMBQ
$1.2B
| $13K | ﹤0.01% |
147
+114
| +345% | +$6.76K |
2026 Q1
1 quarter
|
|
7470
Heritage Financial
HFWA
$1.16B
| $13K | ﹤0.01% |
+438
| New | +$12K |
2026 Q2
0 quarters
|
|
7471
IsoEnergy Ltd
ISOU
$523M
| $13K | ﹤0.01% |
+1,301
| New | +$14.6K |
2026 Q2
0 quarters
|
|
7472
GraniteShares 2x Long AAPL Daily ETF
AAPB
$18.8M
| $13K | ﹤0.01% |
381
+353
| +1,261% | +$12K |
2025 Q2
4 quarters
|
|
7473
PUT
Solid Power
SLDP
$461M
| $13K | ﹤0.01% |
5,000
+1,000
| +25% | +$3.09K |
2024 Q1
9 quarters
|
|
7474
PUT
Taysha Gene Therapies
TSHA
$1.3B
| $12.9K | ﹤0.01% |
1,900
-3,100
| -62% | -$18.3K |
2025 Q4
2 quarters
|
|
7475
Titan America SA
TTAM
$2.54B
| $12.9K | ﹤0.01% |
692
+357
| +107% | +$5.87K |
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.