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 | |
|---|---|---|---|---|---|---|
9276
CALL
Marcus & Millichap
MMI
$1.15B
| $7K | ﹤0.01% |
+200
| New | +$7.51K |
|
9277
CALL
Martin Midstream Partners
MMLP
$95.9M
| $7K | ﹤0.01% |
2,600
+2,593
| +37,043% | +$6.78K |
|
|
9278
PUT
Martin Midstream Partners
MMLP
$95.9M
| $7K | ﹤0.01% |
2,400
+2,375
| +9,500% | +$6.21K |
|
9279
PUT
Nexa Resources
NEXA
$1.7B
| $7K | ﹤0.01% |
+800
| New | +$8.23K |
|
9280
CALL
Natural Gas Services Group
NGS
$470M
| $7K | ﹤0.01% |
700
+695
| +13,900% | +$6.95K |
|
9281
PUT
Nelnet
NNI
$4.79B
| $7K | ﹤0.01% |
+100
| New | +$7.51K |
|
9282
Nurix Therapeutics
NRIX
$2.43B
| $7K | ﹤0.01% |
299
+199
| +199% | +$5.84K |
|
|
TWAV
9283
TaoWeave Inc
TWAV
$4.32M
| $7K | ﹤0.01% |
+4
| New | +$9.69K |
|
9284
PUT
ONE Gas
OGS
$5.05B
| $7K | ﹤0.01% |
100
+89
| +809% | +$6.85K |
|
9285
PUT
Onto Innovation
ONTO
$13.6B
| $7K | ﹤0.01% |
100
+94
| +1,567% | +$6.46K |
|
9286
PUT
Paysign
PAYS
$486M
| $7K | ﹤0.01% |
2,300
+2,247
| +4,240% | +$8.07K |
|
|
PRO
9287
DELISTED
PROS Holdings
PRO
| $7K | ﹤0.01% |
+159
| New | +$7.03K |
|
9288
PUT
Parsons
PSN
$6.28B
| $7K | ﹤0.01% |
200
+195
| +3,900% | +$8.02K |
|
|
BCIC
9289
BCP Investment Corp
BCIC
$86.9M
| $7K | ﹤0.01% |
+326
| New | +$7.73K |
|
9290
PUT
Prudential
PUK
$36.5B
| $7K | ﹤0.01% |
206
+204
| +10,200% | +$8.35K |
|
9291
QuickLogic
QUIK
$224M
| $7K | ﹤0.01% |
1,042
-2,522
| -71% | -$16.5K |
|
|
SHOE
9292
PUT
Shoe Station Group
SHOE
$395M
| $7K | ﹤0.01% |
200
+180
| +900% | +$5.83K |
|
9293
iShares MSCI EAFE Small-Cap ETF
SCZ
$13.5B
| $7K | ﹤0.01% |
105
+100
| +2,000% | +$7.5K |
|
9294
Siebert Financial
SIEB
$68M
| $7K | ﹤0.01% |
1,524
-5,363
| -78% | -$22.2K |
|
9295
PUT
SLR Investment Corp
SLRC
$706M
| $7K | ﹤0.01% |
400
+327
| +448% | +$6.13K |
|
9296
Spero Therapeutics
SPRO
$68.9M
| $7K | ﹤0.01% |
+507
| New | +$7.08K |
|
9297
SouthState Bank Corp
SSB
$10.3B
| $7K | ﹤0.01% |
89
-456
| -84% | -$38.8K |
|
9298
Stoke Therapeutics
STOK
$1.82B
| $7K | ﹤0.01% |
222
-439
| -66% | -$15.5K |
|
9299
CALL
Tennant Co
TNC
$1.5B
| $7K | ﹤0.01% |
100
+98
| +4,900% | +$8.01K |
|
9300
Turning Point Brands
TPB
$1.47B
| $7K | ﹤0.01% |
+153
| New | +$7.08K |
|
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.