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 | |
|---|---|---|---|---|---|---|
|
SERV
2901
Serve Robotics
SERV
$380M
| $901K | ﹤0.01% |
+137,005
| New | +$1.14M |
|
|
KC
2902
CALL
Kingsoft Cloud Holdings
KC
$2.81B
| $900K | ﹤0.01% |
99,500
+33,700
| +51% | +$466K |
|
2903
CALL
Fulcrum Therapeutics
FULC
$284M
| $900K | ﹤0.01% |
+246,000
| New | +$1.5M |
|
2904
CALL
Entravision Communication
EVC
$673M
| $898K | ﹤0.01% |
68,900
+51,400
| +294% | +$364K |
|
2905
CALL
Phunware
PHUN
$40.1M
| $898K | ﹤0.01% |
438,200
+2,700
| +0.6% | +$5.46K |
|
2906
CALL
Legend Biotech
LEGN
$3.6B
| $898K | ﹤0.01% |
31,100
-37,500
| -55% | -$1.01M |
|
2907
PUT
Digital Turbine
APPS
$1.3B
| $898K | ﹤0.01% |
69,600
-31,400
| -31% | -$188K |
|
2908
CALL
Backblaze
BLZE
$799M
| $898K | ﹤0.01% |
56,600
+54,300
| +2,361% | +$376K |
|
2909
PC Connection
CNXN
$2.25B
| $897K | ﹤0.01% |
+12,291
| New | +$820K |
|
2910
PUT
American Superconductor
AMSC
$1.43B
| $897K | ﹤0.01% |
21,600
+9,700
| +82% | +$439K |
|
2911
PUT
Imperial Oil
IMO
$59.3B
| $896K | ﹤0.01% |
8,000
+1,400
| +21% | +$175K |
|
2912
iShares Core S&P 500 ETF
IVV
$883B
| $896K | ﹤0.01% |
+1,196
| New | +$871K |
|
2913
CALL
CNA Financial
CNA
$12.4B
| $894K | ﹤0.01% |
18,400
+18,300
| +18,300% | +$833K |
|
2914
CALL
Mettler-Toledo International
MTD
$30.3B
| $894K | ﹤0.01% |
700
-300
| -30% | -$362K |
|
|
VISN
2915
CALL
Vistance Networks Inc
VISN
$1.4B
| $893K | ﹤0.01% |
69,900
-80,600
| -54% | -$1.14M |
|
2916
PUT
Enliven Therapeutics
ELVN
$3.32B
| $893K | ﹤0.01% |
17,600
-400
| -2% | -$17K |
|
|
NNE
2917
PUT
Nano Nuclear Energy
NNE
$891M
| $892K | ﹤0.01% |
42,200
-25,900
| -38% | -$638K |
|
2918
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.15B
| $890K | ﹤0.01% |
9,300
+3,700
| +66% | +$247K |
|
2919
CALL
Mid-America Apartment Communities
MAA
$13.8B
| $889K | ﹤0.01% |
6,400
+4,000
| +167% | +$522K |
|
2920
PUT
Amcor
AMCR
$19.7B
| $889K | ﹤0.01% |
20,500
-5,300
| -21% | -$210K |
|
2921
PUT
Ericsson
ERIC
$31B
| $888K | ﹤0.01% |
79,600
+65,300
| +457% | +$787K |
|
|
ARXS
2922
Arxis Inc
ARXS
$21B
| $887K | ﹤0.01% |
+19,227
| New | +$751K |
|
2923
CALL
Fidelity Enhanced Large Cap Core ETF
FELC
$8.65B
| $887K | ﹤0.01% |
4,800
-1,200
| -20% | -$48.7K |
|
2924
PUT
Northern Trust
NTRS
$32B
| $887K | ﹤0.01% |
5,100
+200
| +4% | +$32.9K |
|
2925
CALL
Centuri Holdings
CTRI
$2.03B
| $886K | ﹤0.01% |
29,300
+29,200
| +29,200% | +$942K |
|
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.