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 | |
|---|---|---|---|---|---|---|
|
PONY
3926
PUT
Pony AI Inc
PONY
$3.01B
| $387K | ﹤0.01% |
55,700
-94,500
| -63% | -$876K |
|
3927
MPLX
MPLX
$58.5B
| $387K | ﹤0.01% |
+6,862
| New | +$383K |
|
3928
CALL
Arvinas
ARVN
$491M
| $386K | ﹤0.01% |
46,500
+11,900
| +34% | +$111K |
|
3929
PUT
Grand Canyon Education
LOPE
$3.82B
| $386K | ﹤0.01% |
+2,700
| New | +$429K |
|
3930
Galectin Therapeutics
GALT
$396M
| $386K | ﹤0.01% |
83,251
-749
| -0.9% | -$1.94K |
|
3931
Protagonist Therapeutics
PTGX
$9.22B
| $386K | ﹤0.01% |
+3,149
| New | +$329K |
|
3932
CALL
Hyster-Yale Materials Handling
HY
$571M
| $386K | ﹤0.01% |
11,000
-4,100
| -27% | -$149K |
|
3933
PUT
Ryman Hospitality Properties
RHP
$8.42B
| $386K | ﹤0.01% |
3,000
| – | – |
|
3934
NWPX Infrastructure Inc
NWPX
$994M
| $386K | ﹤0.01% |
+2,572
| New | +$282K |
|
3935
PUT
Jazz Pharmaceuticals
JAZZ
$15.5B
| $386K | ﹤0.01% |
1,600
-1,600
| -50% | -$351K |
|
3936
CALL
Tandem Diabetes Care
TNDM
$1.14B
| $385K | ﹤0.01% |
25,500
+14,400
| +130% | +$251K |
|
3937
Lantheus
LNTH
$6.51B
| $385K | ﹤0.01% |
3,468
+3,465
| +115,500% | +$323K |
|
|
TTAN
3938
ServiceTitan Inc
TTAN
$5.78B
| $385K | ﹤0.01% |
+5,440
| New | +$350K |
|
|
ARI
3939
CALL
Apollo Commercial Real Estate
ARI
$797M
| $384K | ﹤0.01% |
36,000
-2,600
| -7% | -$28.3K |
|
3940
USCF SummerHaven Dynamic Commodity Strategy No K-1 Fund
SDCI
$784M
| $384K | ﹤0.01% |
14,541
+2,287
| +19% | +$63.5K |
|
3941
PUT
Ollie's Bargain Outlet
OLLI
$5.08B
| $384K | ﹤0.01% |
5,000
+4,800
| +2,400% | +$400K |
|
|
GRRR
3942
PUT
Gorilla Technology Group
GRRR
$377M
| $384K | ﹤0.01% |
19,300
-3,100
| -14% | -$46.6K |
|
3943
CALL
Polaris
PII
$2.98B
| $383K | ﹤0.01% |
5,600
+2,600
| +87% | +$168K |
|
3944
VF Corp
VFC
$5.67B
| $383K | ﹤0.01% |
22,968
+22,411
| +4,024% | +$401K |
|
3945
Zentalis Pharmaceuticals
ZNTL
$246M
| $383K | ﹤0.01% |
78,904
-19,650
| -20% | -$78.4K |
|
3946
PUT
FIVE9
FIVN
$2.59B
| $382K | ﹤0.01% |
17,900
+9,200
| +106% | +$182K |
|
3947
PUT
Yeti Holdings
YETI
$3.16B
| $382K | ﹤0.01% |
7,700
+6,300
| +450% | +$273K |
|
3948
Rhythm Pharmaceuticals
RYTM
$6.79B
| $381K | ﹤0.01% |
+3,435
| New | +$311K |
|
3949
PUT
United States Gasoline Fund
UGA
$185M
| $381K | ﹤0.01% |
3,700
+2,200
| +147% | +$238K |
|
|
HITI
3950
CALL
High Tide
HITI
$250M
| $380K | ﹤0.01% |
166,800
+75,100
| +82% | +$178K |
|
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.