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 | |
|---|---|---|---|---|---|---|
4426
NEOS S&P 500 High Income ETF
SPYI
$12.3B
| $252K | ﹤0.01% |
4,744
+1,905
| +67% | +$100K |
|
|
AUGO
4427
PUT
Aura Minerals Inc
AUGO
$6.68B
| $252K | ﹤0.01% |
4,000
+2,900
| +264% | +$229K |
|
4428
CALL
NBT Bancorp
NBTB
$2.6B
| $252K | ﹤0.01% |
+5,100
| New | +$233K |
|
4429
Ecopetrol
EC
$34B
| $251K | ﹤0.01% |
17,658
-163,133
| -90% | -$2.36M |
|
4430
Perrigo
PRGO
$2.09B
| $251K | ﹤0.01% |
24,187
-63,421
| -72% | -$698K |
|
4431
PUT
West Pharmaceutical
WST
$26.4B
| $251K | ﹤0.01% |
700
-600
| -46% | -$183K |
|
4432
IPG Photonics
IPGP
$3.3B
| $250K | ﹤0.01% |
2,135
+1,483
| +227% | +$170K |
|
4433
CALL
Canadian National Railway
CNI
$72.6B
| $250K | ﹤0.01% |
2,100
-3,300
| -61% | -$376K |
|
4434
PUT
Unum
UNM
$13.9B
| $250K | ﹤0.01% |
2,800
-42,600
| -94% | -$3.53M |
|
4435
Ryman Hospitality Properties
RHP
$8.4B
| $250K | ﹤0.01% |
+1,944
| New | +$216K |
|
4436
Alta Equipment Group
ALTG
$194M
| $250K | ﹤0.01% |
38,620
+20,148
| +109% | +$135K |
|
|
SW
4437
PUT
Smurfit Westrock
SW
$23.3B
| $250K | ﹤0.01% |
5,400
-1,200
| -18% | -$49.6K |
|
4438
Enovix
ENVX
$603M
| $250K | ﹤0.01% |
+41,144
| New | +$273K |
|
4439
CALL
Allot
ALLT
$417M
| $250K | ﹤0.01% |
28,200
+28,000
| +14,000% | +$208K |
|
|
LKFT
4440
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.94B
| $250K | ﹤0.01% |
8,323
+1,096
| +15% | +$31.1K |
|
4441
NewMarket
NEU
$8.25B
| $249K | ﹤0.01% |
+315
| New | +$227K |
|
4442
PUT
Emcor
EME
$33.5B
| $249K | ﹤0.01% |
300
-2,500
| -89% | -$2.11M |
|
4443
PUT
Adecoagro
AGRO
$1.43B
| $248K | ﹤0.01% |
26,000
+21,500
| +478% | +$271K |
|
4444
PUT
Nuvation Bio
NUVB
$1.99B
| $248K | ﹤0.01% |
43,700
+20,100
| +85% | +$98.2K |
|
4445
CALL
iQIYI
IQ
$959M
| $248K | ﹤0.01% |
238,500
-117,200
| -33% | -$136K |
|
4446
CALL
Talos Energy
TALO
$2.7B
| $248K | ﹤0.01% |
19,200
-8,000
| -29% | -$119K |
|
4447
CALL
FS KKR Capital
FSK
$3.07B
| $248K | ﹤0.01% |
23,600
-76,000
| -76% | -$817K |
|
|
PUSA
4448
CALL
Aureus Greenway Holdings
PUSA
$101M
| $248K | ﹤0.01% |
62,100
+33,000
| +113% | +$138K |
|
4449
Mattel
MAT
$3.78B
| $248K | ﹤0.01% |
+17,842
| New | +$261K |
|
4450
CALL
Pilgrim's Pride
PPC
$6.56B
| $247K | ﹤0.01% |
8,800
+6,200
| +238% | +$191K |
|
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.