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 | |
|---|---|---|---|---|---|---|
4301
VanEck Uranium + Nuclear Energy ETF
NLR
$3.59B
| $278K | ﹤0.01% |
2,401
-1,447
| -38% | -$193K |
|
|
ABX
4302
PUT
Abacus Global Management
ABX
$799M
| $278K | ﹤0.01% |
26,000
+3,500
| +16% | +$32K |
|
4303
iQIYI
IQ
$957M
| $278K | ﹤0.01% |
+267,571
| New | +$311K |
|
4304
PUT
Parsons
PSN
$4.42B
| $278K | ﹤0.01% |
5,300
+4,900
| +1,225% | +$265K |
|
4305
CALL
Immunovant
IMVT
$6.75B
| $277K | ﹤0.01% |
7,200
-7,400
| -51% | -$225K |
|
4306
PUT
New Fortress Energy
NFE
$33.6M
| $277K | ﹤0.01% |
15,278
+4,492
| +42% | +$134K |
|
4307
PUT
PTC Therapeutics
PTCT
$5.39B
| $277K | ﹤0.01% |
3,400
-500
| -13% | -$36.1K |
|
4308
CALL
Helios Technologies
HLIO
$2.26B
| $277K | ﹤0.01% |
3,100
+1,300
| +72% | +$99.8K |
|
4309
PUT
Barclays
BCS
$81.2B
| $277K | ﹤0.01% |
10,300
-25,600
| -71% | -$617K |
|
4310
PUT
DigitalBridge
DBRG
$3B
| $276K | ﹤0.01% |
17,500
-1,300
| -7% | -$20.3K |
|
4311
Virtus Reaves Utilities ETF
UTES
$1.13B
| $276K | ﹤0.01% |
3,378
-799
| -19% | -$64.8K |
|
4312
CALL
US Foods
USFD
$20.2B
| $276K | ﹤0.01% |
2,700
+1,900
| +238% | +$169K |
|
|
MARS
4313
Roundhill Space & Technology ETF
MARS
$52.8M
| $276K | ﹤0.01% |
+8,538
| New | +$287K |
|
4314
Unusual Machines
UMAC
$1.2B
| $276K | ﹤0.01% |
+12,363
| New | +$229K |
|
4315
Hess Midstream
HESM
$4.89B
| $276K | ﹤0.01% |
+7,331
| New | +$282K |
|
4316
Flowserve
FLS
$9.39B
| $275K | ﹤0.01% |
3,711
+3,625
| +4,215% | +$276K |
|
4317
PUT
AMN Healthcare
AMN
$1.33B
| $275K | ﹤0.01% |
8,500
+6,700
| +372% | +$173K |
|
4318
PUT
The GEO Group
GEO
$4B
| $275K | ﹤0.01% |
9,300
-24,300
| -72% | -$551K |
|
4319
Virgin Galactic
SPCE
$470M
| $274K | ﹤0.01% |
94,979
+1,703
| +2% | +$5.56K |
|
4320
LifeMD
LFMD
$140M
| $274K | ﹤0.01% |
66,432
-10,783
| -14% | -$47.6K |
|
4321
PUT
BellRing Brands
BRBR
$878M
| $274K | ﹤0.01% |
21,200
-37,900
| -64% | -$457K |
|
4322
PUT
Iridium Communications
IRDM
$5.11B
| $274K | ﹤0.01% |
5,000
-21,500
| -81% | -$919K |
|
4323
CALL
Vanguard Total International Stock ETF
VXUS
$161B
| $274K | ﹤0.01% |
3,200
-17,600
| -85% | -$1.47M |
|
4324
CALL
World Kinect Corp
WKC
$1.81B
| $273K | ﹤0.01% |
8,300
-8,400
| -50% | -$234K |
|
4325
PUT
Littelfuse
LFUS
$10.8B
| $273K | ﹤0.01% |
+600
| New | +$260K |
|
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.