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 | |
|---|---|---|---|---|---|---|
6476
Aecom
ACM
$8.57B
| $41.3K | ﹤0.01% |
+591
| New | +$45.2K |
|
|
TECX
6477
PUT
Tectonic Therapeutic
TECX
$601M
| $41.3K | ﹤0.01% |
1,200
-7,900
| -87% | -$232K |
|
6478
PUT
Qualys
QLYS
$5.94B
| $41.2K | ﹤0.01% |
300
+100
| +50% | +$9.84K |
|
6479
PUT
Tiptree Inc
TIPT
$689M
| $41.2K | ﹤0.01% |
2,300
-11,600
| -83% | -$200K |
|
6480
PUT
Anterix
ATEX
$1.69B
| $41.2K | ﹤0.01% |
400
-300
| -43% | -$17.6K |
|
6481
CALL
First American
FAF
$7.43B
| $41.2K | ﹤0.01% |
600
+500
| +500% | +$33.3K |
|
6482
CALL
Fulgent Genetics
FLGT
$543M
| $41K | ﹤0.01% |
2,000
-7,400
| -79% | -$125K |
|
6483
US Global Sea to Sky Cargo ETF
SEA
$17M
| $41K | ﹤0.01% |
+2,515
| New | +$43.3K |
|
6484
PUT
Celldex Therapeutics
CLDX
$3.12B
| $40.9K | ﹤0.01% |
1,100
+800
| +267% | +$25.8K |
|
6485
Kinsale Capital Group
KNSL
$8.5B
| $40.9K | ﹤0.01% |
124
-1,428
| -92% | -$459K |
|
6486
iShares Fallen Angels USD Bond ETF
FALN
$1.66B
| $40.9K | ﹤0.01% |
+1,501
| New | +$40.6K |
|
6487
PUT
nCino
NCNO
$2.44B
| $40.9K | ﹤0.01% |
2,500
+2,200
| +733% | +$36.1K |
|
6488
PUT
Harmonic Inc
HLIT
$1.28B
| $40.8K | ﹤0.01% |
+2,500
| New | +$31.9K |
|
6489
PUT
Designer Brands
DBI
$267M
| $40.8K | ﹤0.01% |
7,000
-600
| -8% | -$4.22K |
|
|
UFOX
6490
Defiance Space and Connective Tech ETF
UFOX
$854M
| $40.8K | ﹤0.01% |
+429
| New | +$38.1K |
|
6491
PUT
CNX Resources
CNX
$5.55B
| $40.7K | ﹤0.01% |
1,200
-1,200
| -50% | -$43.3K |
|
6492
Resources Connection
RGP
$139M
| $40.7K | ﹤0.01% |
9,574
+3,268
| +52% | +$13.7K |
|
6493
UroGen Pharma
URGN
$2.16B
| $40.7K | ﹤0.01% |
1,105
-6,961
| -86% | -$189K |
|
6494
CALL
Immersion
IMMR
$256M
| $40.6K | ﹤0.01% |
6,000
+600
| +11% | +$3.78K |
|
6495
CALL
Marcus & Millichap
MMI
$1.21B
| $40.5K | ﹤0.01% |
+1,300
| New | +$37.3K |
|
6496
CALL
Telesat
TSAT
$683M
| $40.5K | ﹤0.01% |
800
-500
| -38% | -$24.2K |
|
6497
CALL
Safe Bulkers
SB
$934M
| $40.4K | ﹤0.01% |
6,400
+6,100
| +2,033% | +$40.8K |
|
6498
Sprout Social
SPT
$688M
| $40.3K | ﹤0.01% |
5,344
-14,114
| -73% | -$91.8K |
|
6499
PUT
Snap-on
SNA
$19.8B
| $40.2K | ﹤0.01% |
100
| – | – |
|
6500
Liquidity Services
LQDT
$1.32B
| $40.2K | ﹤0.01% |
1,028
+262
| +34% | +$9.28K |
|
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.