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 | |
|---|---|---|---|---|---|---|---|
8451
Merlin Inc
MRLN
$84.6M
| $3K | ﹤0.01% |
+527
| New | +$4.46K |
2026 Q2
0 quarters
|
|
8452
USCF Gold Strategy Plus Income Fund
USG
$9.26M
| $3K | ﹤0.01% |
94
-180
| -66% | -$6.46K |
2025 Q4
2 quarters
|
|
8453
CALL
Nautilus Biotechnolgy
NAUT
$335M
| $2.99K | ﹤0.01% |
1,600
-3,900
| -71% | -$10.3K |
2025 Q4
2 quarters
|
|
8454
PUT
Essential Properties Realty Trust
EPRT
$5.61B
| $2.98K | ﹤0.01% |
+100
| New | +$3.11K |
2026 Q2
0 quarters
|
|
8455
iShares US Broker-Dealers & Securities Exchanges ETF
IAI
$1.3B
| $2.98K | ﹤0.01% |
+17
| New | +$3.03K |
2026 Q2
0 quarters
|
|
8456
Trustco Bank Corp NY
TRST
$942M
| $2.96K | ﹤0.01% |
+54
| New | +$2.68K |
2026 Q2
0 quarters
|
|
8457
Genie Energy
GNE
$442M
| $2.96K | ﹤0.01% |
205
+31
| +18% | +$434 |
2025 Q3
3 quarters
|
|
8458
iShares MSCI Saudi Arabia ETF
KSA
$544M
| $2.95K | ﹤0.01% |
79
-1
| -1% | -$39 |
2024 Q4
6 quarters
|
|
8459
CALL
TriplePoint Venture Growth BDC
TPVG
$176M
| $2.95K | ﹤0.01% |
600
-500
| -45% | -$2.68K |
2026 Q1
1 quarter
|
|
8460
VolitionRx Ltd
VNRX
$4.89M
| $2.93K | ﹤0.01% |
+2,174
| New | +$5.24K |
2026 Q2
0 quarters
|
|
8461
iShares Global Infrastructure ETF
IGF
$10.6B
| $2.93K | ﹤0.01% |
44
-193
| -81% | -$13K |
2026 Q1
1 quarter
|
|
8462
PUT
CuriosityStream
CURI
$172M
| $2.93K | ﹤0.01% |
1,100
-8,200
| -88% | -$24.2K |
2024 Q4
6 quarters
|
|
8463
CALL
Transact Technologies
TACT
$53.6M
| $2.92K | ﹤0.01% |
500
+400
| +400% | +$1.62K |
2025 Q2
4 quarters
|
|
8464
PUT
Acco Brands
ACCO
$432M
| $2.91K | ﹤0.01% |
+700
| New | +$2.57K |
2026 Q2
0 quarters
|
|
8465
The RMR Group
RMR
$302M
| $2.87K | ﹤0.01% |
140
-1,135
| -89% | -$21.5K |
2023 Q4
10 quarters
|
|
8466
CALL
STAAR Surgical
STAA
$1.12B
| $2.87K | ﹤0.01% |
100
| – | – |
2025 Q1
5 quarters
|
|
8467
US Global GO Gold and Precious Metal Miners ETF
GOAU
$178M
| $2.86K | ﹤0.01% |
77
-4,059
| -98% | -$173K |
2025 Q2
4 quarters
|
|
8468
Holley
HLLY
$310M
| $2.86K | ﹤0.01% |
+1,122
| New | +$3.18K |
2026 Q2
0 quarters
|
|
8469
Pearson
PSO
$11B
| $2.86K | ﹤0.01% |
+180
| New | +$2.66K |
2026 Q2
0 quarters
|
|
8470
Wise Group
WSE
$10.7B
| $2.86K | ﹤0.01% |
+240
| New | +$2.86K |
2026 Q2
0 quarters
|
|
8471
CALL
Home BancShares
HOMB
$5.98B
| $2.86K | ﹤0.01% |
100
| – | – |
2023 Q3
11 quarters
|
|
8472
CALL
Eagle Bancorp
EGBN
$964M
| $2.84K | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
8473
CALL
Townsquare Media
TSQ
$69.3M
| $2.83K | ﹤0.01% |
400
+300
| +300% | +$1.94K |
2025 Q4
2 quarters
|
|
8474
PUT
MGIC Investment
MTG
$5.69B
| $2.82K | ﹤0.01% |
100
-58,700
| -100% | -$1.56M |
2015 Q2
44 quarters
|
|
8475
Nerdy
NRDY
$51.7M
| $2.82K | ﹤0.01% |
+205
| New | +$2.68K |
2026 Q2
0 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.