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 | |
|---|---|---|---|---|---|---|---|
9026
PUT
Cardiff Oncology
CRDF
$72.2M
| $260 | ﹤0.01% |
200
-11,200
| -98% | -$17.8K |
2024 Q1
9 quarters
|
|
9027
CALL
Kaltura
KLTR
$220M
| $260 | ﹤0.01% |
200
-800
| -80% | -$1.09K |
2025 Q4
2 quarters
|
|
9028
CALL
Innovator US Equity Accelerated ETF Quarterly
XDSQ
$69.2M
| $260 | ﹤0.01% |
+100
| New | +$4.22K |
2026 Q2
0 quarters
|
|
9029
CALL
Holley
HLLY
$315M
| $254 | ﹤0.01% |
100
-900
| -90% | -$2.55K |
2025 Q3
3 quarters
|
|
9030
PUT
Goldgroup Mining
GORO
$566M
| $252 | ﹤0.01% |
50
-675
| -93% | -$3.69K |
2025 Q1
5 quarters
|
|
9031
Roundhill Nasdaq-100 0DTE Covered Call ETF Strategy ETF
QDTE
$904M
| $249 | ﹤0.01% |
+8
| New | +$243 |
2026 Q2
0 quarters
|
|
9032
Cherry Hill Mortgage Investment Corp
CHMI
$93.8M
| $248 | ﹤0.01% |
+107
| New | +$268 |
2026 Q2
0 quarters
|
|
9033
Tradr 2X Short APLD Daily ETF
APLZ
$3.92M
| $247 | ﹤0.01% |
+13
| New | +$431 |
2026 Q2
0 quarters
|
|
9034
PUT
Century Therapeutics
IPSC
$286M
| $245 | ﹤0.01% |
100
-1,800
| -95% | -$4.11K |
2025 Q4
2 quarters
|
|
9035
PUT
DELISTED
Clear Channel Outdoor Holdings
CCO
| $242 | ﹤0.01% |
+100
| New | +$239 |
2026 Q2
0 quarters
|
|
9036
Lesaka Technologies
LSAK
$360M
| $238 | ﹤0.01% |
48
-60
| -56% | -$292 |
2026 Q1
1 quarter
|
|
9037
Center Bancorp
CNOB
$1.65B
| $234 | ﹤0.01% |
+7
| New | +$210 |
2026 Q2
0 quarters
|
|
|
9038
CALL
Cherry Hill Mortgage Investment Corp
CHMI
$93.8M
| $231 | ﹤0.01% |
100
-3,600
| -97% | -$9K |
2025 Q4
2 quarters
|
|
|
9039
PUT
Cherry Hill Mortgage Investment Corp
CHMI
$93.8M
| $231 | ﹤0.01% |
+100
| New | +$250 |
2026 Q2
0 quarters
|
|
|
CNTA
9040
PUT
DELISTED
Centessa Pharmaceuticals
CNTA
| $231 | ﹤0.01% |
128,300
+89,200
| +228% | +$3.54M |
2026 Q1
1 quarter
|
|
9041
CALL
Martin Midstream Partners
MMLP
$84.9M
| $231 | ﹤0.01% |
+100
| New | +$256 |
2026 Q2
0 quarters
|
|
9042
CALL
PharmaCyte Biotech
PMCB
$3.76M
| $231 | ﹤0.01% |
12,400
| – | – |
2025 Q4
2 quarters
|
|
9043
PUT
Grayscale Hyperliquid Staking ETF
HYPG
$153M
| $226 | ﹤0.01% |
+100
| New | +$2.28K |
2026 Q2
0 quarters
|
|
9044
PUT
Fuel Tech
FTEK
$42.1M
| $221 | ﹤0.01% |
+100
| New | +$148 |
2026 Q2
0 quarters
|
|
9045
PUT
OPAL Fuels
OPAL
$46.3M
| $220 | ﹤0.01% |
+100
| New | +$220 |
2026 Q2
0 quarters
|
|
9046
Safe Pro Group Inc
SPAI
$64.8M
| $220 | ﹤0.01% |
+51
| New | +$232 |
2026 Q2
0 quarters
|
|
9047
Ideal Power
IPWR
$46.8M
| $219 | ﹤0.01% |
+41
| New | +$209 |
2026 Q2
0 quarters
|
|
|
ABVE
9048
CALL
DELISTED
Above Food Ingredients Inc
ABVE
| $216 | ﹤0.01% |
2,400
-9,200
| -79% | -$5.89K |
2025 Q4
2 quarters
|
|
9049
Xtrackers MSCI Europe Hedged Equity ETF
DBEU
$774M
| $215 | ﹤0.01% |
4
-111
| -97% | -$5.71K |
2026 Q1
1 quarter
|
|
9050
PIMCO 1-5 Year US TIPS Index Exchange-Traded Fund
STPZ
$563M
| $213 | ﹤0.01% |
4
-1
| -20% | -$54 |
2026 Q1
1 quarter
|
|
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.