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 | |
|---|---|---|---|---|---|---|
7551
PUT
Insulet
PODD
$11.8B
| $54K | ﹤0.01% |
200
+196
| +4,900% | +$53.3K |
|
7552
Royal Gold
RGLD
$16.6B
| $54K | ﹤0.01% |
479
+240
| +100% | +$28.3K |
|
7553
CALL
Rayonier Advanced Materials
RYAM
$562M
| $54K | ﹤0.01% |
8,200
+8,076
| +6,513% | +$65.8K |
|
7554
PUT
Simulations Plus
SLP
$371M
| $54K | ﹤0.01% |
1,000
+995
| +19,900% | +$57K |
|
7555
PUT
StoneX
SNEX
$8.72B
| $54K | ﹤0.01% |
+4,556
| New | +$58.9K |
|
7556
Suburban Propane Partners
SPH
$1.21B
| $54K | ﹤0.01% |
3,540
+713
| +25% | +$10.7K |
|
|
CAMP
7557
PUT
DELISTED
CalAmp Corp.
CAMP
| $54K | ﹤0.01% |
187
+182
| +3,640% | +$54.3K |
|
|
HT
7558
DELISTED
Hersha Hospitality Trust Priority Class A Common Shares of Beneficial Interest
HT
| $54K | ﹤0.01% |
+5,095
| New | +$56.3K |
|
|
NPTN
7559
CALL
DELISTED
NEOPHOTONICS CORP
NPTN
| $54K | ﹤0.01% |
5,300
+5,258
| +12,519% | +$55.5K |
|
7560
PUT
Aegon
AEG
$13.3B
| $53K | ﹤0.01% |
13,854
+13,586
| +5,069% | +$57.8K |
|
7561
PUT
Brink's
BCO
$5.01B
| $53K | ﹤0.01% |
700
+698
| +34,900% | +$54.2K |
|
|
GENZ
7562
VanEck Digital Native Economy ETF
GENZ
$17.4M
| $53K | ﹤0.01% |
+1,005
| New | +$54.5K |
|
7563
CALL
Fuel Tech
FTEK
$43M
| $53K | ﹤0.01% |
22,600
+21,955
| +3,404% | +$51K |
|
7564
CALL
Garrett Motion
GTX
$5.37B
| $53K | ﹤0.01% |
+6,700
| New | +$49.3K |
|
7565
Kaiser Aluminum
KALU
$2.48B
| $53K | ﹤0.01% |
431
+401
| +1,337% | +$50K |
|
7566
PUT
Lands' End
LE
$378M
| $53K | ﹤0.01% |
1,300
+1,237
| +1,963% | +$33.8K |
|
|
MSB
7567
CALL
Mesabi Trust
MSB
$296M
| $53K | ﹤0.01% |
1,500
+1,469
| +4,739% | +$53.1K |
|
|
MTA
7568
Metalla Royalty & Streaming
MTA
$689M
| $53K | ﹤0.01% |
6,237
+356
| +6% | +$3.46K |
|
7569
CALL
OneSpan
OSPN
$584M
| $53K | ﹤0.01% |
2,100
+2,097
| +69,900% | +$54.8K |
|
7570
CALL
Regal Rexnord
RRX
$12.5B
| $53K | ﹤0.01% |
400
+392
| +4,900% | +$55.3K |
|
7571
CALL
Smith Micro Software
SMSI
$13.6M
| $53K | ﹤0.01% |
+258
| New | +$55.2K |
|
|
7572
StoneX
SNEX
$8.72B
| $53K | ﹤0.01% |
+4,465
| New | +$57.7K |
|
7573
CALL
Strategic Education
STRA
$1.98B
| $53K | ﹤0.01% |
700
+699
| +69,900% | +$55.8K |
|
|
7574
PUT
Strategic Education
STRA
$1.98B
| $53K | ﹤0.01% |
700
+696
| +17,400% | +$55.5K |
|
7575
CALL
Interface
TILE
$1.95B
| $53K | ﹤0.01% |
3,500
+3,313
| +1,772% | +$47.7K |
|
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.