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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2676
AXIS Capital
AXS
$8.59B
| $494K | ﹤0.01% |
9,022
-3,947
| -30% | -$219K |
|
2677
CALL
Myriad Genetics
MYGN
$530M
| $494K | ﹤0.01% |
149
+90
| +153% | +$2.74K |
|
2678
Spectrum Brands
SPB
$2.04B
| $494K | ﹤0.01% |
+9,033
| New | +$483K |
|
|
LCI
2679
CALL
DELISTED
Lannett Company, Inc.
LCI
| $494K | ﹤0.01% |
157
-1
| -0.6% | -$32 |
|
2680
General Motors
GM
$74.7B
| $493K | ﹤0.01% |
13,298
+12,319
| +1,258% | +$468K |
|
2681
StoneCo
STNE
$2.62B
| $493K | ﹤0.01% |
+12,006
| New | +$326K |
|
2682
United Parks & Resorts
PRKS
$2.11B
| $493K | ﹤0.01% |
+19,169
| New | +$489K |
|
2683
PUT
Enovis
ENOV
$1.56B
| $492K | ﹤0.01% |
+96
| New | +$4.21K |
|
2684
PUT
Kennametal
KMT
$2.68B
| $492K | ﹤0.01% |
134
+133
| +13,300% | +$4.87K |
|
|
IVC
2685
PUT
DELISTED
Invacare Corporation
IVC
| $492K | ﹤0.01% |
588
+524
| +819% | +$3.77K |
|
|
WUBA
2686
DELISTED
58.com Inc
WUBA
| $492K | ﹤0.01% |
7,496
+4,556
| +155% | +$287K |
|
2687
Upland Software
UPLD
$12M
| $491K | ﹤0.01% |
1,161
+1,072
| +1,204% | +$364K |
|
2688
PUT
American Water Works
AWK
$26.3B
| $490K | ﹤0.01% |
47
+40
| +571% | +$3.92K |
|
|
BBBY
2689
Bed Bath & Beyond
BBBY
$473M
| $490K | ﹤0.01% |
39,296
-93,827
| -70% | -$1.28M |
|
2690
Designer Brands
DBI
$277M
| $489K | ﹤0.01% |
+22,043
| New | +$577K |
|
2691
PUT
GoPro
GPRO
$116M
| $488K | ﹤0.01% |
751
+233
| +45% | +$1.3K |
|
2692
Occidental Petroleum
OXY
$57B
| $487K | ﹤0.01% |
+7,369
| New | +$486K |
|
2693
CALL
Abeona Therapeutics
ABEO
$345M
| $485K | ﹤0.01% |
26
+1
| +4% | +$179 |
|
2694
CALL
EPR Properties
EPR
$4.86B
| $484K | ﹤0.01% |
63
-8
| -11% | -$582 |
|
2695
CALL
Riot Platforms
RIOT
$8.52B
| $484K | ﹤0.01% |
1,483
+1,237
| +503% | +$3.22K |
|
2696
PUT
Voya Financial
VOYA
$8.94B
| $484K | ﹤0.01% |
97
-7
| -7% | -$332 |
|
|
PTR
2697
CALL
DELISTED
PETROCHINA COMPANY LIMITED ADS (REP 100 H SHARES)
PTR
| $484K | ﹤0.01% |
74
+10
| +16% | +$647 |
|
|
ACIA
2698
DELISTED
Acacia Communications Inc
ACIA
| $484K | ﹤0.01% |
+8,440
| New | +$404K |
|
2699
Essent Group
ESNT
$6.06B
| $483K | ﹤0.01% |
11,134
+11,061
| +15,152% | +$455K |
|
|
KRA
2700
DELISTED
Kraton Corporation
KRA
| $483K | ﹤0.01% |
+15,017
| New | +$452K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.