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 | |
|---|---|---|---|---|---|---|
4101
CALL
Kulicke & Soffa
KLIC
$4.8B
| $334K | ﹤0.01% |
2,500
+700
| +39% | +$68.6K |
|
4102
Sasol
SSL
$8.93B
| $333K | ﹤0.01% |
33,944
-47,119
| -58% | -$595K |
|
|
SEV
4103
CALL
Aptera Motors
SEV
$80.3M
| $333K | ﹤0.01% |
135,900
+93,800
| +223% | +$241K |
|
4104
PUT
Vipshop
VIPS
$5.93B
| $333K | ﹤0.01% |
25,100
-200
| -0.8% | -$2.86K |
|
|
CGC
4105
PUT
Canopy Growth
CGC
$391M
| $332K | ﹤0.01% |
349,900
+44,400
| +15% | +$47.1K |
|
4106
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$246M
| $332K | ﹤0.01% |
3,100
+1,600
| +107% | +$107K |
|
|
ONT
4107
CALL
Onterris Inc
ONT
$514M
| $331K | ﹤0.01% |
16,400
+15,100
| +1,162% | +$282K |
|
4108
PUT
Vanguard Dividend Appreciation ETF
VIG
$110B
| $331K | ﹤0.01% |
1,400
-1,400
| -50% | -$321K |
|
4109
CALL
Landstar System
LSTR
$5.61B
| $331K | ﹤0.01% |
1,600
+700
| +78% | +$134K |
|
4110
PUT
Corsair Gaming
CRSR
$1.46B
| $331K | ﹤0.01% |
34,200
+33,700
| +6,740% | +$261K |
|
4111
Boyd Gaming
BYD
$5.03B
| $331K | ﹤0.01% |
3,744
-16,522
| -82% | -$1.41M |
|
4112
Abercrombie & Fitch
ANF
$5.69B
| $329K | ﹤0.01% |
3,656
+2,277
| +165% | +$193K |
|
4113
Red Robin
RRGB
$141M
| $329K | ﹤0.01% |
+41,157
| New | +$183K |
|
|
TUZ
4114
PUT
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $329K | ﹤0.01% |
6,200
+1,200
| +24% | +$63.6K |
|
4115
CALL
Alcon
ALC
$31.5B
| $329K | ﹤0.01% |
4,900
+2,900
| +145% | +$203K |
|
4116
N-able
NABL
$765M
| $328K | ﹤0.01% |
89,475
+89,441
| +263,062% | +$372K |
|
4117
PUT
Aecom
ACM
$7.65B
| $328K | ﹤0.01% |
4,700
+1,900
| +68% | +$145K |
|
4118
CALL
Nabors Industries
NBR
$1.21B
| $328K | ﹤0.01% |
3,900
+2,200
| +129% | +$205K |
|
4119
PUT
Bit Digital
BTBT
$606M
| $327K | ﹤0.01% |
181,600
+108,000
| +147% | +$190K |
|
4120
CALL
IMAX
IMAX
$3.08B
| $327K | ﹤0.01% |
8,200
-15,300
| -65% | -$586K |
|
4121
CALL
Copa Holdings
CPA
$5.35B
| $327K | ﹤0.01% |
2,100
+1,600
| +320% | +$208K |
|
|
TWO
4122
DELISTED
Two Harbors Investment
TWO
| $326K | ﹤0.01% |
26,309
+1,843
| +8% | +$22K |
|
4123
ODDITY Tech
ODD
$812M
| $326K | ﹤0.01% |
21,575
+5,901
| +38% | +$79.1K |
|
|
EXK
4124
PUT
Endeavour Silver
EXK
$2.65B
| $326K | ﹤0.01% |
39,400
-16,700
| -30% | -$155K |
|
|
NGEN
4125
CALL
NervGen Pharma
NGEN
$202M
| $326K | ﹤0.01% |
158,300
+158,100
| +79,050% | +$491K |
|
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.