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 | |
|---|---|---|---|---|---|---|
5101
PUT
Backblaze
BLZE
$828M
| $146K | ﹤0.01% |
9,200
+7,900
| +608% | +$54.6K |
|
5102
CALL
Velocity Financial
VEL
$597M
| $146K | ﹤0.01% |
+7,900
| New | +$144K |
|
5103
CALL
CrossAmerica Partners
CAPL
$814M
| $146K | ﹤0.01% |
6,500
-3,400
| -34% | -$74K |
|
5104
CALL
Bausch + Lomb
BLCO
$6.12B
| $146K | ﹤0.01% |
8,800
+6,300
| +252% | +$100K |
|
|
LTM
5105
CALL
LATAM Airlines Group S.A.
LTM
$14.7B
| $146K | ﹤0.01% |
2,500
+1,300
| +108% | +$66.9K |
|
5106
PUT
Concentrix
CNXC
$1.52B
| $146K | ﹤0.01% |
6,500
-74,800
| -92% | -$1.95M |
|
5107
Brink's
BCO
$4.25B
| $146K | ﹤0.01% |
1,541
+848
| +122% | +$88.3K |
|
5108
CALL
Mohawk Industries
MHK
$8.46B
| $146K | ﹤0.01% |
1,200
-1,200
| -50% | -$126K |
|
5109
GraniteShares ETF Trust GraniteShares 2x Long BABA Daily ETF
BABX
$111M
| $146K | ﹤0.01% |
10,501
+9,335
| +801% | +$226K |
|
5110
Palladyne AI
PDYN
$258M
| $145K | ﹤0.01% |
23,906
-8,989
| -27% | -$59.5K |
|
5111
CALL
Arcosa
ACA
$7.17B
| $145K | ﹤0.01% |
1,000
+200
| +25% | +$24.8K |
|
5112
PUT
Pharvaris
PHVS
$2.23B
| $145K | ﹤0.01% |
4,200
-6,100
| -59% | -$185K |
|
5113
CALL
Leonardo DRS
DRS
$9.8B
| $145K | ﹤0.01% |
3,400
-1,100
| -24% | -$48.9K |
|
5114
CALL
Graphic Packaging
GPK
$2.73B
| $145K | ﹤0.01% |
13,700
-19,800
| -59% | -$202K |
|
5115
PUT
Simply Good Foods
SMPL
$850M
| $145K | ﹤0.01% |
10,900
-1,300
| -11% | -$16K |
|
|
CALY
5116
PUT
Callaway Golf Company
CALY
$2.53B
| $145K | ﹤0.01% |
7,700
+4,400
| +133% | +$69K |
|
5117
Geron
GERN
$797M
| $145K | ﹤0.01% |
112,989
-6,011
| -5% | -$8.47K |
|
5118
Ameresco
AMRC
$1.12B
| $145K | ﹤0.01% |
+5,240
| New | +$152K |
|
5119
Imperial Oil
IMO
$58.9B
| $145K | ﹤0.01% |
+1,291
| New | +$162K |
|
5120
CALL
Porch Group
PRCH
$1.88B
| $144K | ﹤0.01% |
9,600
-20,400
| -68% | -$201K |
|
5121
PUT
Dyne Therapeutics
DYN
$3.03B
| $144K | ﹤0.01% |
6,500
+600
| +10% | +$11.2K |
|
|
MRP
5122
PUT
Millrose Properties Inc
MRP
$4.4B
| $144K | ﹤0.01% |
4,800
-10,200
| -68% | -$295K |
|
|
NTST
5123
PUT
NETSTREIT Corp
NTST
$1.82B
| $144K | ﹤0.01% |
6,800
+500
| +8% | +$10.1K |
|
5124
CALL
Donaldson
DCI
$10.1B
| $144K | ﹤0.01% |
1,600
-5,900
| -79% | -$507K |
|
5125
StoneX
SNEX
$7.87B
| $144K | ﹤0.01% |
1,818
-7,076
| -80% | -$531K |
|
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.