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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
9201
PUT
EVgo
EVGO
$200M
| $8K | ﹤0.01% |
11,300
+11,245
| +20,445% | +$144K |
|
|
HYPD
9202
Hyperion DeFi Inc
HYPD
$38M
| $8K | ﹤0.01% |
+21
| New | +$8.63K |
|
9203
First Trust Large Cap Core AlphaDEX Fund
FEX
$1.58B
| $8K | ﹤0.01% |
+100
| New | +$8.41K |
|
9204
First Hawaiian
FHB
$3.42B
| $8K | ﹤0.01% |
+287
| New | +$8.04K |
|
9205
Forestar Group
FOR
$1.44B
| $8K | ﹤0.01% |
+412
| New | +$9.64K |
|
9206
CALL
GATX Corp
GATX
$6.55B
| $8K | ﹤0.01% |
100
+33
| +49% | +$3.17K |
|
|
GLDD
9207
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
| $8K | ﹤0.01% |
+600
| New | +$8.86K |
|
9208
CALL
Genasys
GNSS
$75.6M
| $8K | ﹤0.01% |
1,600
+1,563
| +4,224% | +$9.54K |
|
9209
iShares Convertible Bond ETF
ICVT
$7.23B
| $8K | ﹤0.01% |
+87
| New | +$8.64K |
|
|
IMMP
9210
Immutep
IMMP
$56.7M
| $8K | ﹤0.01% |
+2,174
| New | +$8.6K |
|
9211
CALL
Innodata
INOD
$1.83B
| $8K | ﹤0.01% |
1,200
+1,188
| +9,900% | +$8.05K |
|
9212
CALL
Kite Realty
KRG
$5.95B
| $8K | ﹤0.01% |
400
+391
| +4,344% | +$8.22K |
|
9213
CALL
Legend Biotech
LEGN
$4.3B
| $8K | ﹤0.01% |
200
+198
| +9,900% | +$6.73K |
|
9214
Centrus Energy
LEU
$3.22B
| $8K | ﹤0.01% |
350
-7,009
| -95% | -$167K |
|
9215
PUT
LivaNova
LIVN
$4.3B
| $8K | ﹤0.01% |
+100
| New | +$8.23K |
|
9216
PUT
Lesaka Technologies
LSAK
$388M
| $8K | ﹤0.01% |
+1,800
| New | +$9.38K |
|
9217
Malibu Boats
MBUU
$544M
| $8K | ﹤0.01% |
116
-1,225
| -91% | -$97.5K |
|
9218
PUT
Mizuho Financial
MFG
$129B
| $8K | ﹤0.01% |
3,000
+2,969
| +9,577% | +$8.87K |
|
9219
Milestone Scientific
MLSS
$34.5M
| $8K | ﹤0.01% |
+3,524
| New | +$8.55K |
|
|
9220
PUT
Milestone Scientific
MLSS
$34.5M
| $8K | ﹤0.01% |
3,400
+3,380
| +16,900% | +$8.2K |
|
9221
Martin Midstream Partners
MMLP
$95.9M
| $8K | ﹤0.01% |
2,684
-749
| -22% | -$1.96K |
|
9222
PUT
Nomad Foods
NOMD
$1.64B
| $8K | ﹤0.01% |
300
+169
| +129% | +$4.97K |
|
9223
Northwest Natural Holdings
NWN
$2.17B
| $8K | ﹤0.01% |
+157
| New | +$8.49K |
|
9224
PUT
Organogenesis Holdings
ORGO
$308M
| $8K | ﹤0.01% |
500
+494
| +8,233% | +$9.21K |
|
9225
Orion Group Holdings
ORN
$514M
| $8K | ﹤0.01% |
1,510
-9,775
| -87% | -$56.9K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.