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 |
Apple
AAPL
|
+$34.8M |
| 2 |
Bausch Health
BHC
|
+$20.3M |
| 3 |
Chipotle Mexican Grill
CMG
|
+$18.9M |
| 4 |
GMCR
KEURIG GREEN MTN INC
GMCR
|
+$12.3M |
| 5 |
Amazon
AMZN
|
+$12.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$27.5M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.8M |
| 3 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$12.1M |
| 4 |
Netflix
NFLX
|
+$10.7M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$10.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 9.5% |
| 2 | Healthcare | 7.55% |
| 3 | Technology | 7.01% |
| 4 | Communication Services | 6.66% |
| 5 | Industrials | 5.76% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3001
Cardiff Oncology
CRDF
$63.1M
| $14K | ﹤0.01% |
+36
| New | +$14.1K |
|
3002
Quest Diagnostics
DGX
$26.1B
| $14K | ﹤0.01% |
198
-645
| -77% | -$43.4K |
|
3003
CALL
DaVita
DVA
$15.4B
| $14K | ﹤0.01% |
150
-42
| -22% | -$3.08K |
|
3004
Fortuna Silver Mines
FSM
$2.57B
| $14K | ﹤0.01% |
6,371
+2,157
| +51% | +$5.39K |
|
3005
CALL
Generac Holdings
GNRC
$11.5B
| $14K | ﹤0.01% |
153
+134
| +705% | +$4.01K |
|
3006
iShares US Oil Equipment & Services ETF
IEZ
$352M
| $14K | ﹤0.01% |
+410
| New | +$16.2K |
|
|
IRBT
3007
PUT
DELISTED
iRobot
IRBT
| $14K | ﹤0.01% |
59
-13
| -18% | -$420 |
|
3008
CALL
CarMax
KMX
$8.25B
| $14K | ﹤0.01% |
294
+245
| +500% | +$14K |
|
3009
CALL
Lands' End
LE
$390M
| $14K | ﹤0.01% |
93
+55
| +145% | +$1.33K |
|
3010
PUT
Labcorp
LH
$25.5B
| $14K | ﹤0.01% |
86
+67
| +353% | +$6.91K |
|
3011
PUT
Louisiana-Pacific
LPX
$5.38B
| $14K | ﹤0.01% |
316
+228
| +259% | +$3.95K |
|
3012
PUT
Middleby
MIDD
$6.22B
| $14K | ﹤0.01% |
35
+14
| +67% | +$1.56K |
|
3013
CALL
Navios Maritime Partners
NMM
$2.24B
| $14K | ﹤0.01% |
+22
| New | +$1.72K |
|
3014
CALL
Novartis
NVS
$303B
| $14K | ﹤0.01% |
212
-116
| -35% | -$9.21K |
|
3015
CALL
Oracle
ORCL
$346B
| $14K | ﹤0.01% |
245
-1,910
| -89% | -$72.9K |
|
3016
CALL
Sturm, Ruger & Co
RGR
$618M
| $14K | ﹤0.01% |
49
-6
| -11% | -$337 |
|
3017
PUT
SPS Commerce
SPSC
$2.51B
| $14K | ﹤0.01% |
+118
| New | +$4.31K |
|
3018
PUT
TE Connectivity
TEL
$60.9B
| $14K | ﹤0.01% |
55
+45
| +450% | +$2.9K |
|
3019
Tempest Therapeutics
TPST
$14.3M
| $14K | ﹤0.01% |
1
-1
| -50% | -$33K |
|
3020
PUT
Veeco
VECO
$2.76B
| $14K | ﹤0.01% |
14
+4
| +40% | +$81 |
|
3021
CALL
VF Corp
VFC
$6.94B
| $14K | ﹤0.01% |
195
-343
| -64% | -$21.4K |
|
3022
PUT
Viasat
VSAT
$9.88B
| $14K | ﹤0.01% |
+75
| New | +$4.77K |
|
|
VTLE
3023
CALL
DELISTED
Vital Energy
VTLE
| $14K | ﹤0.01% |
26
+10
| +63% | +$2.19K |
|
3024
CALL
WD-40
WDFC
$3.18B
| $14K | ﹤0.01% |
21
+4
| +24% | +$388 |
|
3025
CALL
Worthington Enterprises
WOR
$2.87B
| $14K | ﹤0.01% |
169
-475
| -74% | -$8.78K |
|
Similar funds
Simplex Trading's Q4 2015 Portfolio in Review
As of Q4 2015, Simplex Trading held 7,008 positions worth $1.28B, down 6.4% from $1.36B the previous quarter. Its ten largest holdings account for 19% of the portfolio.
Simplex Trading's Q4 2015 filing shows 1,417 new, 1,993 increased, 1,803 reduced and 1,598 closed positions. Its largest new stake was Chipotle Mexican Grill: 1,548,150 shares worth $14.9M. The largest sale was iShares Russell 2000 ETF, an estimated $27.5M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 9.5% of assets, up from 4.6% a quarter earlier, followed by Healthcare and Technology.
- Simplex Trading's largest Q4 2015 buy was Chipotle Mexican Grill: 1,548,150 shares worth $14.9M.
- Simplex Trading added most to Apple in Q4 2015, an estimated $34.8M increase.
- Simplex Trading's biggest Q4 2015 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $13.8M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2015, selling an estimated $27.5M.
- Simplex Trading's ten largest holdings make up 19% of its $1.28B portfolio in Q4 2015.
- Simplex Trading opened 1,417 new positions and closed 1,598 in Q4 2015.
- Simplex Trading's portfolio value fell 6.4% quarter-over-quarter to $1.28B.
Based on Simplex Trading's 13F filing for Q4 2015, filed 20 Jan 2016.