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 | |
|---|---|---|---|---|---|---|
|
ASA
6876
PUT
ASA Gold and Precious Metals
ASA
$1.19B
| $26K | ﹤0.01% |
500
+100
| +25% | +$6.26K |
|
6877
Vanguard Intermediate-Term Treasury ETF
VGIT
$42.1B
| $26K | ﹤0.01% |
440
-23
| -5% | -$1.36K |
|
|
AIV
6878
Aimco
AIV
$372M
| $25.9K | ﹤0.01% |
8,734
-5,665
| -39% | -$21.7K |
|
6879
PUT
Avient
AVNT
$3.98B
| $25.9K | ﹤0.01% |
700
-500
| -42% | -$18.1K |
|
6880
PUT
Tronox
TROX
$768M
| $25.8K | ﹤0.01% |
4,100
+600
| +17% | +$5.09K |
|
6881
CALL
CGI
GIB
$15.3B
| $25.8K | ﹤0.01% |
400
-400
| -50% | -$27.3K |
|
6882
PUT
BCB Bancorp
BCBP
$157M
| $25.7K | ﹤0.01% |
2,400
-2,900
| -55% | -$29.6K |
|
6883
PUT
Orthofix Medical
OFIX
$378M
| $25.6K | ﹤0.01% |
2,800
+2,100
| +300% | +$23.2K |
|
6884
CALL
Kiniksa Pharmaceuticals
KNSA
$6.08B
| $25.6K | ﹤0.01% |
400
+200
| +100% | +$10.4K |
|
6885
CALL
Atea Pharmaceuticals
AVIR
$468M
| $25.6K | ﹤0.01% |
5,500
+900
| +20% | +$4.48K |
|
|
DRD
6886
PUT
DRDGold
DRD
$2.48B
| $25.6K | ﹤0.01% |
1,200
-1,400
| -54% | -$37.8K |
|
6887
PUT
Diebold Nixdorf
DBD
$2.33B
| $25.5K | ﹤0.01% |
300
| – | – |
|
6888
PUT
PolyPid
PYPD
$109M
| $25.4K | ﹤0.01% |
+5,000
| New | +$23.1K |
|
6889
PUT
Amtech Systems
ASYS
$262M
| $25.4K | ﹤0.01% |
1,100
+300
| +38% | +$5.7K |
|
6890
PUT
Aaon
AAON
$6.55B
| $25.4K | ﹤0.01% |
+200
| New | +$23.4K |
|
|
MSB
6891
PUT
Mesabi Trust
MSB
$314M
| $25.3K | ﹤0.01% |
1,000
-600
| -38% | -$16.5K |
|
6892
PUT
GigaCloud Technology
GCT
$1.85B
| $25.3K | ﹤0.01% |
800
-4,900
| -86% | -$193K |
|
6893
CALL
Stagwell
STGW
$2.14B
| $25.3K | ﹤0.01% |
3,400
-800
| -19% | -$5.3K |
|
6894
PUT
Dorchester Minerals
DMLP
$1.43B
| $25.3K | ﹤0.01% |
1,000
-2,100
| -68% | -$57.3K |
|
6895
American Public Education
APEI
$830M
| $25.2K | ﹤0.01% |
470
+195
| +71% | +$10.7K |
|
6896
CALL
Ardmore Shipping
ASC
$742M
| $25.2K | ﹤0.01% |
1,800
-100
| -5% | -$1.7K |
|
6897
PUT
Victory Capital Holdings
VCTR
$7B
| $25.2K | ﹤0.01% |
+300
| New | +$24.1K |
|
6898
PUT
Jacobs Solutions
J
$17.1B
| $25.2K | ﹤0.01% |
200
-2,000
| -91% | -$246K |
|
6899
PUT
VeriSign
VRSN
$26.4B
| $25.2K | ﹤0.01% |
100
-400
| -80% | -$111K |
|
6900
CALL
CAE Inc
CAE
$7.86B
| $25.1K | ﹤0.01% |
+1,000
| New | +$25.9K |
|
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.