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 | |
|---|---|---|---|---|---|---|
2076
PUT
Madrigal Pharmaceuticals
MDGL
$11.9B
| $1.93M | ﹤0.01% |
3,600
-600
| -14% | -$307K |
|
2077
Crown Castle
CCI
$28.9B
| $1.93M | ﹤0.01% |
25,461
+4,159
| +20% | +$365K |
|
2078
NuScale Power
SMR
$3.46B
| $1.93M | ﹤0.01% |
191,947
-51,079
| -21% | -$576K |
|
|
TE
2079
T1 Energy
TE
$1.11B
| $1.92M | ﹤0.01% |
+203,034
| New | +$1.44M |
|
2080
On Holding
ONON
$10B
| $1.92M | ﹤0.01% |
+54,316
| New | +$1.99M |
|
2081
PUT
ImmunityBio
IBRX
$8.95B
| $1.92M | ﹤0.01% |
219,600
-270,100
| -55% | -$2.04M |
|
2082
Polaris
PII
$3.02B
| $1.92M | ﹤0.01% |
28,091
+15,169
| +117% | +$977K |
|
2083
PUT
Manchester United
MANU
$3.52B
| $1.92M | ﹤0.01% |
83,700
-1,300
| -2% | -$25.7K |
|
|
VG
2084
Venture Global Inc
VG
$31.6B
| $1.92M | ﹤0.01% |
+172,394
| New | +$2.18M |
|
2085
CALL
Omega Healthcare
OHI
$14B
| $1.92M | ﹤0.01% |
40,200
+26,900
| +202% | +$1.25M |
|
2086
PUT
Fastly Inc
FSLY
$3.98B
| $1.91M | ﹤0.01% |
104,300
-425,800
| -80% | -$9.25M |
|
2087
Intercontinental Exchange
ICE
$86.6B
| $1.91M | ﹤0.01% |
+15,522
| New | +$2.33M |
|
2088
CALL
Blackstone Mortgage Trust
BXMT
$2.11B
| $1.91M | ﹤0.01% |
112,700
-2,300
| -2% | -$43K |
|
2089
PUT
Planet Fitness
PLNT
$3.22B
| $1.91M | ﹤0.01% |
36,600
+15,500
| +73% | +$910K |
|
2090
CleanSpark
CLSK
$3.58B
| $1.91M | ﹤0.01% |
131,223
-181,044
| -58% | -$2.55M |
|
2091
iShares MSCI Taiwan ETF
EWT
$12.5B
| $1.91M | ﹤0.01% |
+17,563
| New | +$1.64M |
|
2092
CALL
Arthur J. Gallagher & Co
AJG
$59.2B
| $1.91M | ﹤0.01% |
8,300
-4,600
| -36% | -$977K |
|
2093
Ramaco Resources Class A
METC
$574M
| $1.91M | ﹤0.01% |
143,992
+45,502
| +46% | +$663K |
|
|
GRAL
2094
CALL
GRAIL Inc
GRAL
$5.67B
| $1.9M | ﹤0.01% |
27,900
+1,800
| +7% | +$106K |
|
2095
Direxion Daily Homebuilders & Supplies Bull 3X ETF
NAIL
$541M
| $1.9M | ﹤0.01% |
36,619
+35,299
| +2,674% | +$1.47M |
|
|
SGI
2096
Somnigroup International
SGI
$13.5B
| $1.9M | ﹤0.01% |
+24,259
| New | +$1.78M |
|
2097
CALL
Valley National Bancorp
VLY
$7.23B
| $1.9M | ﹤0.01% |
129,800
+84,200
| +185% | +$1.14M |
|
2098
CALL
PACS Group
PACS
$6.54B
| $1.9M | ﹤0.01% |
44,500
+600
| +1% | +$21.6K |
|
|
BLDP
2099
CALL
Ballard Power Systems
BLDP
$748M
| $1.9M | ﹤0.01% |
487,700
+343,500
| +238% | +$1.4M |
|
2100
CALL
Beyond Meat
BYND
$144M
| $1.9M | ﹤0.01% |
84,297
-22,833
| -21% | -$532K |
|
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.