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 | |
|---|---|---|---|---|---|---|
4426
Century Aluminum
CENX
$4.26B
| $420K | ﹤0.01% |
32,650
+17,581
| +117% | +$253K |
|
4427
Cirrus Logic
CRUS
$6.87B
| $420K | ﹤0.01% |
4,935
-9,105
| -65% | -$730K |
|
4428
Bloomin' Brands
BLMN
$760M
| $419K | ﹤0.01% |
15,446
+840
| +6% | +$23.8K |
|
4429
PUT
Hyatt Hotels
H
$17.6B
| $419K | ﹤0.01% |
5,400
+5,279
| +4,363% | +$427K |
|
4430
PUT
KT
KT
$8.82B
| $419K | ﹤0.01% |
30,100
+29,803
| +10,035% | +$408K |
|
4431
CALL
Dr. Reddy's Laboratories
RDY
$9.85B
| $419K | ﹤0.01% |
28,500
+28,465
| +81,329% | +$398K |
|
4432
CALL
Repligen
RGEN
$6.96B
| $419K | ﹤0.01% |
+2,100
| New | +$407K |
|
|
SVM
4433
Silvercorp Metals
SVM
$2.08B
| $419K | ﹤0.01% |
76,440
+56,147
| +277% | +$326K |
|
|
APLT
4434
DELISTED
Applied Therapeutics
APLT
| $418K | ﹤0.01% |
20,144
+11,279
| +127% | +$214K |
|
4435
PUT
Alphatec Holdings
ATEC
$1.48B
| $418K | ﹤0.01% |
27,300
+27,218
| +33,193% | +$420K |
|
4436
CALL
GrafTech
EAF
$191M
| $418K | ﹤0.01% |
3,600
+3,594
| +59,900% | +$451K |
|
4437
PUT
Ebang International Holdings
EBON
$12.7M
| $418K | ﹤0.01% |
+4,527
| New | +$509K |
|
|
PPLI
4438
People Inc
PPLI
$3.16B
| $418K | ﹤0.01% |
+3,312
| New | +$429K |
|
|
SOHU
4439
CALL
Sohu.com
SOHU
$355M
| $418K | ﹤0.01% |
22,500
+22,065
| +5,072% | +$393K |
|
|
KAMN
4440
CALL
DELISTED
Kaman Corp
KAMN
| $418K | ﹤0.01% |
+8,300
| New | +$442K |
|
|
BLCN
4441
DELISTED
Siren ETF Trust Siren NexGen Economy ETF
BLCN
| $417K | ﹤0.01% |
8,783
+2,873
| +49% | +$137K |
|
4442
CALL
First Bancorp
FBNC
$2.63B
| $417K | ﹤0.01% |
+10,200
| New | +$440K |
|
4443
PUT
Teledyne Technologies
TDY
$29.6B
| $417K | ﹤0.01% |
1,000
+998
| +49,900% | +$424K |
|
|
BERY
4444
CALL
DELISTED
Berry Global Group, Inc.
BERY
| $417K | ﹤0.01% |
6,970
+6,909
| +11,326% | +$416K |
|
|
LCI
4445
CALL
DELISTED
Lannett Company, Inc.
LCI
| $417K | ﹤0.01% |
+22,350
| New | +$429K |
|
|
VRS
4446
CALL
DELISTED
Verso Corporation
VRS
| $417K | ﹤0.01% |
23,600
+23,374
| +10,342% | +$385K |
|
4447
Essex Property Trust
ESS
$19B
| $416K | ﹤0.01% |
+1,389
| New | +$410K |
|
4448
PUT
China Yuchai International
CYD
$1.71B
| $415K | ﹤0.01% |
25,900
+25,880
| +129,400% | +$420K |
|
|
TBHC
4449
DELISTED
The Brand House Collective
TBHC
| $415K | ﹤0.01% |
18,169
+8,928
| +97% | +$240K |
|
4450
PUT
NewtekOne
NEWT
$433M
| $415K | ﹤0.01% |
11,900
+11,751
| +7,887% | +$369K |
|
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.