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 | |
|---|---|---|---|---|---|---|
5276
CALL
Western Midstream Partners
WES
$19.6B
| $254K | ﹤0.01% |
11,900
+11,405
| +2,304% | +$236K |
|
|
VNTR
5277
CALL
DELISTED
Venator Materials PLC
VNTR
| $254K | ﹤0.01% |
53,700
+52,879
| +6,441% | +$253K |
|
|
EMKR
5278
CALL
DELISTED
Emcore Corp
EMKR
| $254K | ﹤0.01% |
2,760
+2,750
| +27,500% | +$222K |
|
5279
CALL
AdvanSix
ASIX
$555M
| $253K | ﹤0.01% |
+8,500
| New | +$255K |
|
5280
Black Hills Corp
BKH
$5.5B
| $253K | ﹤0.01% |
3,862
+1,706
| +79% | +$116K |
|
5281
PUT
Liberty Energy
LBRT
$2.93B
| $253K | ﹤0.01% |
17,900
+17,397
| +3,459% | +$235K |
|
5282
CALL
Madrigal Pharmaceuticals
MDGL
$11.4B
| $253K | ﹤0.01% |
2,600
+2,581
| +13,584% | +$306K |
|
|
THS
5283
CALL
DELISTED
Treehouse Foods
THS
| $253K | ﹤0.01% |
5,700
+5,548
| +3,650% | +$274K |
|
|
RICE
5284
DELISTED
Rice Acquisition Corp.
RICE
| $253K | ﹤0.01% |
+14,050
| New | +$217K |
|
5285
PUT
C.H. Robinson
CHRW
$17.3B
| $252K | ﹤0.01% |
2,700
+2,663
| +7,197% | +$260K |
|
5286
CALL
Dorchester Minerals
DMLP
$1.3B
| $252K | ﹤0.01% |
15,000
+14,930
| +21,329% | +$227K |
|
5287
CALL
EyePoint Inc
EYPT
$1.08B
| $252K | ﹤0.01% |
28,100
+28,021
| +35,470% | +$269K |
|
5288
CALL
Comfort Systems
FIX
$59.8B
| $252K | ﹤0.01% |
3,200
+3,187
| +24,515% | +$260K |
|
5289
CALL
IPG Photonics
IPGP
$3.6B
| $252K | ﹤0.01% |
1,200
+1,121
| +1,419% | +$236K |
|
5290
Iridium Communications
IRDM
$5.05B
| $252K | ﹤0.01% |
6,310
+2,397
| +61% | +$93.1K |
|
5291
PUT
Manitowoc
MTW
$497M
| $252K | ﹤0.01% |
+10,300
| New | +$245K |
|
5292
PUT
Impinj
PI
$4.51B
| $252K | ﹤0.01% |
4,900
+4,897
| +163,233% | +$252K |
|
5293
PUT
Perella Weinberg Partners
PWP
$1.09B
| $252K | ﹤0.01% |
+19,600
| New | +$231K |
|
|
VAPO
5294
CALL
DELISTED
Vapotherm, Inc. Common Stock
VAPO
| $252K | ﹤0.01% |
1,338
+1,335
| +44,500% | +$228K |
|
|
MGP
5295
PUT
DELISTED
MGM Growth Properties LLC Class A common shares representing limited liability company interests
MGP
| $252K | ﹤0.01% |
6,900
+6,852
| +14,275% | +$244K |
|
|
ADN
5296
DELISTED
Advent Technologies
ADN
| $251K | ﹤0.01% |
+869
| New | +$289K |
|
|
AIV
5297
Aimco
AIV
$383M
| $251K | ﹤0.01% |
37,485
-80,037
| -68% | -$551K |
|
5298
PUT
Encore Capital Group
ECPG
$2.02B
| $251K | ﹤0.01% |
5,300
+5,289
| +48,082% | +$230K |
|
5299
CALL
Genco Shipping & Trading
GNK
$1.13B
| $251K | ﹤0.01% |
13,300
+13,167
| +9,900% | +$203K |
|
|
MRNS
5300
PUT
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $251K | ﹤0.01% |
14,000
+13,935
| +21,438% | +$224K |
|
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.