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 | |
|---|---|---|---|---|---|---|
4401
Woodward
WWD
$19.3B
| $258K | ﹤0.01% |
606
-967
| -61% | -$367K |
|
4402
CALL
Gold Royalty Corp
GROY
$700M
| $257K | ﹤0.01% |
93,200
+14,100
| +18% | +$46.5K |
|
4403
CALL
Scorpio Tankers
STNG
$4.2B
| $256K | ﹤0.01% |
3,700
-13,000
| -78% | -$1.02M |
|
|
FRVO
4404
Fervo Energy
FRVO
$3.99B
| $256K | ﹤0.01% |
+8,760
| New | +$316K |
|
4405
TransDigm Group
TDG
$60.5B
| $256K | ﹤0.01% |
+192
| New | +$236K |
|
|
AVGX
4406
Defiance Daily Target 2X Long AVGO ETF
AVGX
$226M
| $255K | ﹤0.01% |
5,456
+5,098
| +1,424% | +$287K |
|
4407
PUT
Honda
HMC
$41.7B
| $255K | ﹤0.01% |
9,400
-2,200
| -19% | -$56K |
|
4408
Gaming and Leisure Properties
GLPI
$11.2B
| $255K | ﹤0.01% |
+5,721
| New | +$268K |
|
4409
CALL
Ironwood Pharmaceuticals
IRWD
$679M
| $254K | ﹤0.01% |
60,400
+13,600
| +29% | +$52.4K |
|
4410
PUT
Limbach Holdings
LMB
$578M
| $254K | ﹤0.01% |
3,300
-700
| -18% | -$58.2K |
|
4411
PUT
Immunocore
IMCR
$1.57B
| $254K | ﹤0.01% |
8,000
+2,900
| +57% | +$85.8K |
|
4412
CALL
EPAM Systems
EPAM
$5.52B
| $254K | ﹤0.01% |
3,200
-1,300
| -29% | -$137K |
|
4413
PUT
Gen Digital
GEN
$12.3B
| $254K | ﹤0.01% |
10,200
-1,700
| -14% | -$38K |
|
4414
Moelis & Co
MC
$4.28B
| $254K | ﹤0.01% |
3,880
+3,841
| +9,849% | +$252K |
|
4415
CALL
Opko Health
OPK
$1.22B
| $254K | ﹤0.01% |
169,100
+900
| +0.5% | +$1.15K |
|
4416
CALL
Marqeta
MQ
$1.76B
| $253K | ﹤0.01% |
15,600
+13,400
| +609% | +$218K |
|
4417
WEC Energy
WEC
$33.4B
| $253K | ﹤0.01% |
+2,165
| New | +$247K |
|
4418
CALL
Steris
STE
$20.4B
| $253K | ﹤0.01% |
1,200
+1,100
| +1,100% | +$236K |
|
4419
ARK Autonomous Technology & Robotics ETF
ARKQ
$2.02B
| $253K | ﹤0.01% |
+1,911
| New | +$248K |
|
|
ETOR
4420
PUT
eToro Group
ETOR
$2.03B
| $253K | ﹤0.01% |
6,400
-3,600
| -36% | -$136K |
|
4421
Blend Labs
BLND
$246M
| $253K | ﹤0.01% |
147,696
+23,310
| +19% | +$37.2K |
|
4422
PUT
Par Pacific Holdings
PARR
$3.9B
| $252K | ﹤0.01% |
4,500
+1,500
| +50% | +$89.3K |
|
4423
PUT
Methode Electronics
MEI
$512M
| $252K | ﹤0.01% |
13,300
+9,200
| +224% | +$95.1K |
|
|
ABK
4424
PUT
DELISTED
Ambac Financial Group
ABK
| $252K | ﹤0.01% |
40,400
+39,200
| +3,267% | +$245K |
|
|
BLLN
4425
PUT
BillionToOne Inc
BLLN
$5.71B
| $252K | ﹤0.01% |
+2,100
| New | +$192K |
|
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.