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 | |
|---|---|---|---|---|---|---|
4951
CALL
Cushman & Wakefield Ltd
CWK
$2.76B
| $165K | ﹤0.01% |
12,300
+11,800
| +2,360% | +$158K |
|
4952
CALL
Allegiant Air
ALGT
$2.11B
| $165K | ﹤0.01% |
1,400
-200
| -13% | -$17.3K |
|
4953
PUT
Outlook Therapeutics
OTLK
$152M
| $165K | ﹤0.01% |
103,500
+101,800
| +5,988% | +$63.1K |
|
4954
PUT
Monte Rosa Therapeutics
GLUE
$1B
| $165K | ﹤0.01% |
6,800
-1,100
| -14% | -$20.8K |
|
4955
ARK 21Shares Bitcoin ETF
ARKB
$3.18B
| $165K | ﹤0.01% |
+8,454
| New | +$201K |
|
4956
PUT
Oxford Industries
OXM
$375M
| $164K | ﹤0.01% |
4,700
-1,700
| -27% | -$70.7K |
|
4957
CALL
Universal Health Services
UHS
$10.4B
| $164K | ﹤0.01% |
1,100
-3,400
| -76% | -$553K |
|
|
IMSR
4958
PUT
Terrestrial Energy
IMSR
$421M
| $164K | ﹤0.01% |
23,100
+5,300
| +30% | +$39.2K |
|
4959
CALL
Ginkgo Bioworks
DNA
$805M
| $164K | ﹤0.01% |
16,500
+12,500
| +313% | +$105K |
|
|
HOS
4960
CALL
Hornbeck Offshore Services, Inc.
HOS
$2.52B
| $163K | ﹤0.01% |
18,700
-3,700
| -17% | -$35.6K |
|
|
KYIV
4961
CALL
Kyivstar Group
KYIV
$2.95B
| $163K | ﹤0.01% |
10,100
-72,000
| -88% | -$940K |
|
4962
Everspin Technologies
MRAM
$454M
| $163K | ﹤0.01% |
6,753
+2,387
| +55% | +$53.5K |
|
4963
Amplify International Enhanced Dividend Income ETF
IDVO
$1.43B
| $163K | ﹤0.01% |
3,887
-2,464
| -39% | -$104K |
|
4964
PUT
American Well
AMWL
$223M
| $163K | ﹤0.01% |
17,900
+16,500
| +1,179% | +$123K |
|
4965
CALL
Bank of Hawaii
BOH
$2.73B
| $163K | ﹤0.01% |
2,000
-100
| -5% | -$7.83K |
|
|
JKS
4966
CALL
JinkoSolar
JKS
$503M
| $163K | ﹤0.01% |
9,700
-400
| -4% | -$8.76K |
|
4967
PUT
NNN REIT
NNN
$7.93B
| $163K | ﹤0.01% |
3,500
-1,000
| -22% | -$44.7K |
|
|
DGXX
4968
Digi Power X Inc
DGXX
$431M
| $163K | ﹤0.01% |
+29,854
| New | +$163K |
|
4969
PUT
Bloomin' Brands
BLMN
$690M
| $163K | ﹤0.01% |
17,800
-8,600
| -33% | -$62.6K |
|
|
BTQ
4970
BTQ Technologies Corp
BTQ
$418M
| $162K | ﹤0.01% |
30,146
+23,592
| +360% | +$88K |
|
4971
Lakeland Industries
LAKE
$103M
| $162K | ﹤0.01% |
15,189
+12,071
| +387% | +$122K |
|
4972
CALL
Bioventus
BVS
$956M
| $162K | ﹤0.01% |
17,200
-32,200
| -65% | -$307K |
|
4973
PUT
GDS Holdings
GDS
$6.27B
| $162K | ﹤0.01% |
5,400
-44,700
| -89% | -$1.73M |
|
4974
CALL
ManpowerGroup
MAN
$2.63B
| $162K | ﹤0.01% |
4,800
+1,900
| +66% | +$58.2K |
|
|
DEA
4975
CALL
Easterly Government Properties
DEA
$1.09B
| $162K | ﹤0.01% |
6,500
-22,800
| -78% | -$535K |
|
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.