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 | Held Since | |
|---|---|---|---|---|---|---|---|
9101
PUT
Universal Electronics
UEIC
$65.3M
| $86 | ﹤0.01% |
+100
| New | +$416 |
2026 Q2
0 quarters
|
|
9102
PUT
Heron Therapeutics
HRTX
$56.2M
| $85 | ﹤0.01% |
200
-700
| -78% | -$561 |
2026 Q1
1 quarter
|
|
9103
Knife River
KNF
$3.06B
| $83 | ﹤0.01% |
+1
| New | +$83 |
2026 Q2
0 quarters
|
|
9104
Whitehawk Therapeutics
WHWK
$185M
| $82 | ﹤0.01% |
+18
| New | +$75 |
2026 Q2
0 quarters
|
|
9105
PUT
IGC Pharma
IGC
$25.6M
| $81 | ﹤0.01% |
+300
| New | +$89 |
2026 Q2
0 quarters
|
|
9106
US Treasury 30 Year Bond ETF
UTHY
$211M
| $81 | ﹤0.01% |
+2
| New | +$81 |
2026 Q2
0 quarters
|
|
9107
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $78 | ﹤0.01% |
300
+100
| +50% | +$136 |
2026 Q1
1 quarter
|
|
9108
NetSol Technologies
NTWK
$92.6M
| $78 | ﹤0.01% |
+17
| New | +$69 |
2026 Q2
0 quarters
|
|
|
TRIB
9109
CALL
Trinity Biotech
TRIB
$6.11M
| $77 | ﹤0.01% |
7
| – | – |
2025 Q3
3 quarters
|
|
9110
GraniteShares YieldBOOST MSTR ETF
MTYY
$1.41M
| $77 | ﹤0.01% |
+4
| New | +$102 |
2026 Q1
1 quarter
|
|
9111
PUT
FingerMotion
FNGR
$11.9M
| $75 | ﹤0.01% |
200
-800
| -80% | -$639 |
2025 Q2
4 quarters
|
|
9112
PUT
Cosmos Holdings
COSM
$25.5M
| $74 | ﹤0.01% |
+400
| New | +$116 |
2026 Q2
0 quarters
|
|
9113
Schwab Emerging Markets Equity ETF
SCHE
$12.3B
| $72 | ﹤0.01% |
2
-199
| -99% | -$7.11K |
2026 Q1
1 quarter
|
|
9114
Interface
TILE
$2.11B
| $71 | ﹤0.01% |
2
-531
| -100% | -$15.5K |
2026 Q1
1 quarter
|
|
9115
Liberty Latin America Class A
LILA
$1.59B
| $70 | ﹤0.01% |
+9
| New | +$50 |
2026 Q2
0 quarters
|
|
9116
CALL
Mercer International
MERC
$9.4M
| $66 | ﹤0.01% |
+100
| New | +$99 |
2026 Q2
0 quarters
|
|
9117
VanEck Commodity Strategy ETF
PIT
$485M
| $66 | ﹤0.01% |
+1
| New | +$73 |
2026 Q2
0 quarters
|
|
9118
CALL
RPM International
RPM
$13B
| $64 | ﹤0.01% |
1,000
| – | – |
2016 Q1
41 quarters
|
|
9119
AXS Astoria Inflation Sensitive ETF
PPI
$153M
| $63 | ﹤0.01% |
+3
| New | +$65 |
2026 Q2
0 quarters
|
|
9120
PUT
Astronics
ATRO
$2.55B
| $61 | ﹤0.01% |
600
-840
| -58% | -$57.3K |
2025 Q3
3 quarters
|
|
9121
Lakeland Financial Corp
LKFN
$1.48B
| $61 | ﹤0.01% |
1
-8
| -89% | -$482 |
2026 Q1
1 quarter
|
|
|
BSCI
9122
CALL
DELISTED
Invesco BulletShares 2018 Corporate Bond ETF
BSCI
| $60 | ﹤0.01% |
+200
| New | +$60 |
2026 Q2
0 quarters
|
|
9123
Bank of N.T. Butterfield & Son
NTB
$2.37B
| $59 | ﹤0.01% |
+1
| New | +$57 |
2026 Q2
0 quarters
|
|
9124
Commerce Bancshares
CBSH
$8.11B
| $57 | ﹤0.01% |
1
-1,083
| -100% | -$56.8K |
2025 Q4
2 quarters
|
|
9125
CALL
Enlivex Ltd
ENLV
$3.97M
| $54 | ﹤0.01% |
7
-260
| -97% | -$3.01K |
2023 Q3
11 quarters
|
|
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.