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 |
Goldman Sachs
GS
|
+$40.4M |
| 2 |
NVIDIA
NVDA
|
+$23.1M |
| 3 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$21.5M |
| 4 |
Wells Fargo
WFC
|
+$20.8M |
| 5 |
Micron Technology
MU
|
+$20M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Citigroup
C
|
+$21.4M |
| 2 |
Apple
AAPL
|
+$15.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$14.4M |
| 4 |
Eli Lilly
LLY
|
+$10.5M |
| 5 |
iShares Biotechnology ETF
IBB
|
+$8.06M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 9.73% |
| 2 | Communication Services | 9.25% |
| 3 | Consumer Discretionary | 8.76% |
| 4 | Healthcare | 8.53% |
| 5 | Financials | 7.38% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3951
California Water Service
CWT
$3.1B
| $10K | ﹤0.01% |
+294
| New | +$10.2K |
|
3952
CoreCivic
CXW
$2.94B
| $10K | ﹤0.01% |
332
-1,749
| -84% | -$53.5K |
|
|
CYBR
3953
PUT
DELISTED
CyberArk
CYBR
| $10K | ﹤0.01% |
177
+172
| +3,440% | +$8.77K |
|
3954
PUT
Delek US
DK
$3.98B
| $10K | ﹤0.01% |
82
+59
| +257% | +$1.4K |
|
3955
CALL
Euronet Worldwide
EEFT
$3.19B
| $10K | ﹤0.01% |
28
-170
| -86% | -$13.4K |
|
3956
PUT
Extra Space Storage
EXR
$32.3B
| $10K | ﹤0.01% |
58
+34
| +142% | +$2.57K |
|
3957
PUT
Frontline
FRO
$8.71B
| $10K | ﹤0.01% |
81
-206
| -72% | -$1.44K |
|
3958
CALL
Flotek Industries
FTK
$789M
| $10K | ﹤0.01% |
13
-3
| -19% | -$206 |
|
3959
PUT
Invesco CurrencyShares British Pound Sterling Trust
FXB
$77.1M
| $10K | ﹤0.01% |
174
-443
| -72% | -$53.6K |
|
|
GES
3960
DELISTED
Guess Inc
GES
| $10K | ﹤0.01% |
908
-5,992
| -87% | -$73.7K |
|
3961
PUT
Gold Fields
GFI
$28.8B
| $10K | ﹤0.01% |
361
+221
| +158% | +$747 |
|
3962
Graham Corp
GHM
$1.03B
| $10K | ﹤0.01% |
+438
| New | +$10K |
|
3963
CALL
Glaukos
GKOS
$9.49B
| $10K | ﹤0.01% |
5
-32
| -86% | -$1.4K |
|
3964
CALL
Gentex
GNTX
$5.1B
| $10K | ﹤0.01% |
72
+13
| +22% | +$273 |
|
3965
PUT
FerroAtlántica
GSM
$590M
| $10K | ﹤0.01% |
165
-456
| -73% | -$4.8K |
|
3966
PUT
Huntington Bancshares
HBAN
$34B
| $10K | ﹤0.01% |
584
+538
| +1,170% | +$7.35K |
|
|
HEES
3967
PUT
DELISTED
H&E Equipment Services
HEES
| $10K | ﹤0.01% |
179
+57
| +47% | +$1.4K |
|
3968
CALL
InterDigital
IDCC
$6.75B
| $10K | ﹤0.01% |
30
-56
| -65% | -$5.03K |
|
3969
CALL
Intuit
INTU
$91.1B
| $10K | ﹤0.01% |
127
-159
| -56% | -$19.1K |
|
3970
CALL
Korea Electric Power
KEP
$14.6B
| $10K | ﹤0.01% |
51
-78
| -60% | -$1.46K |
|
3971
PUT
Kirby Corp
KEX
$7.01B
| $10K | ﹤0.01% |
39
-919
| -96% | -$62.7K |
|
3972
PUT
KKR & Co
KKR
$89.1B
| $10K | ﹤0.01% |
284
-582
| -67% | -$10.3K |
|
3973
Standard BioTools
LAB
$342M
| $10K | ﹤0.01% |
1,873
+1,454
| +347% | +$9.21K |
|
3974
PUT
LGI Homes
LGIH
$1.35B
| $10K | ﹤0.01% |
97
-445
| -82% | -$13.6K |
|
3975
PUT
Lam Research
LRCX
$316B
| $10K | ﹤0.01% |
1,320
-2,020
| -60% | -$23.7K |
|
Similar funds
Simplex Trading's Q1 2017 Portfolio in Review
As of Q1 2017, Simplex Trading held 7,485 positions worth $2.31B, up 38% from $1.67B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading deployed $551M of net new capital in Q1 2017, opening 1,662 new positions and adding to 2,374 existing holdings. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 179,511 shares worth $21.7M.
By sector, the portfolio is most concentrated in Technology at 9.7% of assets, up from 7.2% a quarter earlier, followed by Communication Services and Consumer Discretionary.
On the sell side, the largest reduction was Citigroup, an estimated $21.4M trimmed.
- Simplex Trading's largest Q1 2017 buy was iShares 20+ Year Treasury Bond ETF: 179,511 shares worth $21.7M.
- Simplex Trading added most to Goldman Sachs in Q1 2017, an estimated $40.4M increase.
- Simplex Trading's biggest Q1 2017 reduction was Citigroup, cutting an estimated $21.4M.
- Simplex Trading fully exited Invesco QQQ Trust in Q1 2017, selling an estimated $14.4M.
- Simplex Trading's ten largest holdings make up 18% of its $2.31B portfolio in Q1 2017.
- Simplex Trading opened 1,662 new positions and closed 1,369 in Q1 2017.
- Simplex Trading's portfolio value rose 38% quarter-over-quarter to $2.31B.
Based on Simplex Trading's 13F filing for Q1 2017, filed 21 Apr 2017.