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 | |
|---|---|---|---|---|---|---|---|
8951
Metropolitan Bank Holding Corp
MCB
$1.2B
| $493 | ﹤0.01% |
+5
| New | +$453 |
2026 Q2
0 quarters
|
|
8952
PUT
Aptera Motors
SEV
$61.8M
| $490 | ﹤0.01% |
200
-8,300
| -98% | -$21.3K |
2025 Q4
2 quarters
|
|
8953
CALL
Foghorn Therapeutics
FHTX
$119M
| $488 | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
8954
CALL
Tuniu
TOUR
$52M
| $483 | ﹤0.01% |
100
+30
| +43% | +$182 |
2025 Q4
2 quarters
|
|
8955
iShares Core MSCI EAFE ETF
IEFA
$188B
| $482 | ﹤0.01% |
+5
| New | +$480 |
2026 Q2
0 quarters
|
|
8956
PUT
Oramed Pharmaceuticals
ORMP
$172M
| $481 | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8957
PUT
aTyr Pharma
ATYR
$16.2M
| $477 | ﹤0.01% |
800
-43,500
| -98% | -$28.4K |
2024 Q4
6 quarters
|
|
8958
PUT
Ardagh Metal Packaging
AMBP
$2.73B
| $474 | ﹤0.01% |
100
| – | – |
2021 Q4
18 quarters
|
|
8959
PUT
Investcorp Credit Management BDC
ICMB
$10.1M
| $468 | ﹤0.01% |
400
| – | – |
2026 Q1
1 quarter
|
|
8960
Mercantile Bank Corp
MBWM
$1.06B
| $459 | ﹤0.01% |
+8
| New | +$422 |
2026 Q2
0 quarters
|
|
8961
CALL
IRIDEX
IRIX
$13.1M
| $458 | ﹤0.01% |
400
| – | – |
2026 Q1
1 quarter
|
|
8962
PUT
Whitehawk Therapeutics
WHWK
$183M
| $458 | ﹤0.01% |
+100
| New | +$416 |
2026 Q2
0 quarters
|
|
8963
CALL
eHealth
EHTH
$17M
| $447 | ﹤0.01% |
300
-1,800
| -86% | -$3.02K |
2025 Q4
2 quarters
|
|
8964
PUT
Ellington Residential Mortgage REIT
EARN
$136M
| $442 | ﹤0.01% |
100
| – | – |
2025 Q4
2 quarters
|
|
8965
India Internet & Ecommerce ETF
INQQ
$39.2M
| $437 | ﹤0.01% |
+34
| New | +$423 |
2026 Q2
0 quarters
|
|
8966
CALL
OFG Bancorp
OFG
$2.15B
| $436 | ﹤0.01% |
+100
| New | +$4.53K |
2026 Q2
0 quarters
|
|
8967
PUT
Purple Innovation
PRPL
$11.6M
| $428 | ﹤0.01% |
+48
| New | +$588 |
2026 Q2
0 quarters
|
|
8968
PUT
Jasper Therapeutics
JSPR
$17M
| $421 | ﹤0.01% |
1,000
+100
| +11% | +$75 |
2025 Q4
2 quarters
|
|
8969
CALL
Castor Maritime
CTRM
$15.5M
| $420 | ﹤0.01% |
200
-3,600
| -95% | -$7.17K |
2025 Q4
2 quarters
|
|
|
8970
PUT
Castor Maritime
CTRM
$15.5M
| $420 | ﹤0.01% |
+200
| New | +$398 |
2026 Q2
0 quarters
|
|
8971
PUT
Repay Holdings
RPAY
$361M
| $420 | ﹤0.01% |
+100
| New | +$347 |
2026 Q2
0 quarters
|
|
8972
First Advantage
FA
$3.65B
| $415 | ﹤0.01% |
+23
| New | +$333 |
2026 Q2
0 quarters
|
|
8973
Invesco Russell 1000 Equal Weight ETF
EQAL
$812M
| $414 | ﹤0.01% |
7
-59
| -89% | -$3.42K |
2026 Q1
1 quarter
|
|
8974
CALL
Key Tronic
KTCC
$23.5M
| $413 | ﹤0.01% |
+100
| New | +$328 |
2026 Q2
0 quarters
|
|
8975
PUT
SCYNEXIS
SCYX
$37.7M
| $407 | ﹤0.01% |
+100
| New | +$621 |
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.