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 | |
|---|---|---|---|---|---|---|---|
|
FMDG
6451
CALL
DELISTED
Fieldstone Merlin Dynamic Large Cap Growth ETF
FMDG
| $42.2K | ﹤0.01% |
1,000
-3,000
| -75% | -$127K |
2025 Q2
4 quarters
|
|
6452
CALL
Allegion
ALLE
$15.2B
| $42.1K | ﹤0.01% |
+300
| New | +$40.8K |
2026 Q2
0 quarters
|
|
6453
CALL
VistaGen Therapeutics
VTGN
$7.71M
| $42.1K | ﹤0.01% |
186,400
+172,100
| +1,203% | +$104K |
2023 Q2
12 quarters
|
|
6454
PUT
Extreme Networks
EXTR
$3B
| $42.1K | ﹤0.01% |
1,300
+1,100
| +550% | +$26.5K |
2022 Q3
15 quarters
|
|
6455
PUT
American Financial Group
AFG
$12.5B
| $42K | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
6456
PUT
Cronos Group
CRON
$1.22B
| $42K | ﹤0.01% |
15,100
-13,000
| -46% | -$34.9K |
2021 Q1
21 quarters
|
|
6457
StandardAero Inc
SARO
$7.43B
| $42K | ﹤0.01% |
1,403
+1,173
| +510% | +$30.8K |
2025 Q3
3 quarters
|
|
6458
PUT
Fidus Investment
FDUS
$743M
| $42K | ﹤0.01% |
+2,200
| New | +$40.8K |
2026 Q2
0 quarters
|
|
6459
PUT
Hilton Grand Vacations
HGV
$2.78B
| $41.9K | ﹤0.01% |
800
+500
| +167% | +$24.1K |
2026 Q1
1 quarter
|
|
6460
Tradr 2X Long CEG Daily ETF
CEGX
$12.7M
| $41.9K | ﹤0.01% |
+3,594
| New | +$56.3K |
2026 Q2
0 quarters
|
|
6461
CALL
MiniMed Group Inc
MMED
$5.25B
| $41.9K | ﹤0.01% |
+2,800
| New | +$36.9K |
2026 Q2
0 quarters
|
|
6462
PUT
Vanguard Total Bond Market
BND
$164B
| $41.8K | ﹤0.01% |
600
-1,700
| -74% | -$125K |
2019 Q3
27 quarters
|
|
6463
CALL
Keros Therapeutics
KROS
$225M
| $41.7K | ﹤0.01% |
3,900
-31,900
| -89% | -$355K |
2024 Q1
9 quarters
|
|
6464
PUT
Huazhu Hotels Group
HTHT
$14.9B
| $41.7K | ﹤0.01% |
1,000
-4,100
| -80% | -$195K |
2016 Q4
38 quarters
|
|
6465
PUT
Franklin Covey
FC
$210M
| $41.7K | ﹤0.01% |
+1,700
| New | +$38.7K |
2026 Q2
0 quarters
|
|
6466
ProShares Ultra Solana ETF
SLON
$24.2M
| $41.6K | ﹤0.01% |
2,331
+2,063
| +770% | +$48.1K |
2026 Q1
1 quarter
|
|
6467
Adicet Bio
ACET
$36.9M
| $41.6K | ﹤0.01% |
4,814
+3,421
| +246% | +$27K |
2025 Q4
2 quarters
|
|
6468
GraniteShares 2x Long PLTR Daily ETF
PTIR
$310M
| $41.6K | ﹤0.01% |
+4,430
| New | +$60.5K |
2026 Q2
0 quarters
|
|
6469
PUT
Bar Harbor Bankshares
BHB
$681M
| $41.5K | ﹤0.01% |
1,100
+900
| +450% | +$31.6K |
2025 Q2
4 quarters
|
|
6470
DELISTED
Theravance Biopharma
TBPH
| $41.5K | ﹤0.01% |
+2,442
| New | +$40.4K |
2026 Q2
0 quarters
|
|
6471
CMB.TECH NV
CMBT
$5.33B
| $41.5K | ﹤0.01% |
2,966
-36,943
| -93% | -$532K |
2025 Q3
3 quarters
|
|
6472
GraniteShares 2x Long MARA Daily ETF
MRAL
$14M
| $41.5K | ﹤0.01% |
583
+330
| +130% | +$20.7K |
2026 Q1
1 quarter
|
|
6473
RadNet
RDNT
$5.51B
| $41.4K | ﹤0.01% |
672
-2,612
| -80% | -$147K |
2025 Q4
2 quarters
|
|
6474
Titan Mining Corp
TII
$193M
| $41.3K | ﹤0.01% |
+18,869
| New | +$47K |
2026 Q2
0 quarters
|
|
6475
CALL
Protara Therapeutics
TARA
$139M
| $41.3K | ﹤0.01% |
10,800
-19,800
| -65% | -$94.2K |
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.