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 | |
|---|---|---|---|---|---|---|
4251
CALL
Encompass Health
EHC
$12.1B
| $293K | ﹤0.01% |
2,900
-8,100
| -74% | -$839K |
|
4252
PUT
Janus Henderson Small Cap Growth Alpha ETF
JSML
$339M
| $293K | ﹤0.01% |
5,800
-13,200
| -69% | -$1.1M |
|
4253
CALL
Tonix Pharmaceuticals
TNXP
$166M
| $292K | ﹤0.01% |
22,900
+14,000
| +157% | +$181K |
|
4254
PUT
Universal Corp
UVV
$1.04B
| $292K | ﹤0.01% |
5,600
-1,800
| -24% | -$95.9K |
|
|
TXNM
4255
TXNM Energy Inc
TXNM
$6.41B
| $292K | ﹤0.01% |
5,144
+3,449
| +203% | +$202K |
|
4256
CALL
Lightspeed Commerce
LSPD
$1.26B
| $292K | ﹤0.01% |
27,800
+3,500
| +14% | +$32.6K |
|
4257
PUT
Cemex
CX
$13.9B
| $292K | ﹤0.01% |
24,300
+7,600
| +46% | +$94.4K |
|
4258
PUT
Unifirst Corp
UNF
$4.61B
| $291K | ﹤0.01% |
1,100
-2,400
| -69% | -$627K |
|
4259
First Trust Indxx NextG ETF
NXTG
$565M
| $290K | ﹤0.01% |
1,894
+1,729
| +1,048% | +$246K |
|
4260
PUT
EverQuote
EVER
$666M
| $290K | ﹤0.01% |
12,200
+12,100
| +12,100% | +$222K |
|
|
ASTX
4261
Tradr 2X Long ASTS Daily ETF
ASTX
$250M
| $290K | ﹤0.01% |
10,512
+3,166
| +43% | +$111K |
|
|
ABTC
4262
CALL
American Bitcoin Corp
ABTC
$645M
| $290K | ﹤0.01% |
28,407
-3,553
| -11% | -$54.4K |
|
4263
Beam Therapeutics
BEAM
$2.5B
| $290K | ﹤0.01% |
8,450
+7,142
| +546% | +$216K |
|
|
SKYT
4264
DELISTED
SkyWater Technology
SKYT
| $290K | ﹤0.01% |
8,322
-11,711
| -58% | -$400K |
|
4265
United Therapeutics
UTHR
$20.3B
| $289K | ﹤0.01% |
+534
| New | +$301K |
|
4266
CALL
Jazz Pharmaceuticals
JAZZ
$15.1B
| $289K | ﹤0.01% |
1,200
-5,200
| -81% | -$1.14M |
|
4267
PUT
Brown & Brown
BRO
$20B
| $289K | ﹤0.01% |
4,500
+1,500
| +50% | +$91.5K |
|
4268
Yelp
YELP
$964M
| $288K | ﹤0.01% |
11,764
+9,293
| +376% | +$231K |
|
4269
Axcelis
ACLS
$3.85B
| $288K | ﹤0.01% |
1,522
+1,503
| +7,911% | +$223K |
|
|
VZLA
4270
Vizsla Silver
VZLA
$1.35B
| $288K | ﹤0.01% |
87,305
+796
| +0.9% | +$2.77K |
|
4271
PUT
Eastman Chemical
EMN
$7.53B
| $288K | ﹤0.01% |
4,300
-1,300
| -23% | -$95.1K |
|
4272
Casey's General Stores
CASY
$22.2B
| $288K | ﹤0.01% |
+362
| New | +$292K |
|
4273
CALL
New York Times
NYT
$10.2B
| $287K | ﹤0.01% |
4,100
+1,100
| +37% | +$84.8K |
|
|
WRD
4274
PUT
WeRide Inc
WRD
$1.74B
| $286K | ﹤0.01% |
49,200
+17,300
| +54% | +$125K |
|
4275
PUT
BioMarin Pharmaceuticals
BMRN
$11.6B
| $286K | ﹤0.01% |
5,000
-3,300
| -40% | -$181K |
|
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.