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 | |
|---|---|---|---|---|---|---|
3826
Arrowhead Research
ARWR
$12.1B
| $162K | ﹤0.01% |
8,876
-2,355
| -21% | -$38.8K |
|
3827
PUT
BlackLine
BL
$1.87B
| $162K | ﹤0.01% |
35
+33
| +1,650% | +$1.55K |
|
3828
CALL
Global Net Lease
GNL
$1.86B
| $162K | ﹤0.01% |
+86
| New | +$1.64K |
|
3829
CALL
Halozyme
HALO
$9.9B
| $162K | ﹤0.01% |
101
-26
| -20% | -$421 |
|
3830
Coca-Cola Femsa
KOF
$22.8B
| $162K | ﹤0.01% |
+2,462
| New | +$154K |
|
3831
PUT
USA Compression Partners
USAC
$3.75B
| $162K | ﹤0.01% |
104
+93
| +845% | +$1.42K |
|
3832
W.R. Berkley
WRB
$28.3B
| $162K | ﹤0.01% |
+6,487
| New | +$153K |
|
|
SIX
3833
PUT
DELISTED
Six Flags Entertainment Corp.
SIX
| $162K | ﹤0.01% |
33
-63
| -66% | -$3.56K |
|
|
BKS
3834
PUT
DELISTED
Barnes & Noble
BKS
| $162K | ﹤0.01% |
300
-13
| -4% | -$79 |
|
3835
Adient
ADNT
$1.7B
| $161K | ﹤0.01% |
+12,491
| New | +$219K |
|
3836
PUT
China Automotive Systems
CAAS
$131M
| $161K | ﹤0.01% |
500
-22
| -4% | -$70 |
|
3837
CALL
CoreCivic
CXW
$3.03B
| $161K | ﹤0.01% |
83
-32
| -28% | -$631 |
|
3838
CALL
MidCap Financial Investment
MFIC
$811M
| $161K | ﹤0.01% |
+107
| New | +$1.61K |
|
|
3839
PUT
MidCap Financial Investment
MFIC
$811M
| $161K | ﹤0.01% |
107
+85
| +386% | +$1.27K |
|
3840
ON Semiconductor
ON
$32.8B
| $161K | ﹤0.01% |
7,855
-13,783
| -64% | -$284K |
|
3841
CALL
Insulet
PODD
$11.6B
| $161K | ﹤0.01% |
17
-30
| -64% | -$2.57K |
|
3842
PUT
TriNet
TNET
$3.14B
| $161K | ﹤0.01% |
27
+22
| +440% | +$1.16K |
|
|
PRFT
3843
CALL
DELISTED
Perficient Inc
PRFT
| $161K | ﹤0.01% |
59
-142
| -71% | -$3.74K |
|
3844
PUT
Coca-Cola Europacific Partners
CCEP
$49.2B
| $160K | ﹤0.01% |
31
+14
| +82% | +$665 |
|
|
FLNT
3845
CALL
Fluent
FLNT
$102M
| $160K | ﹤0.01% |
48
+29
| +153% | +$855 |
|
3846
PUT
Frontline
FRO
$8.63B
| $160K | ﹤0.01% |
249
+156
| +168% | +$927 |
|
3847
Qorvo
QRVO
$8.09B
| $160K | ﹤0.01% |
+2,231
| New | +$148K |
|
|
SEM
3848
CALL
DELISTED
Select Medical
SEM
| $160K | ﹤0.01% |
212
-594
| -74% | -$4.78K |
|
3849
PUT
Scotiabank
BNS
$108B
| $159K | ﹤0.01% |
30
-117
| -80% | -$6.41K |
|
3850
PUT
Santander
BSBR
$41B
| $159K | ﹤0.01% |
+148
| New | +$1.77K |
|
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.