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 | |
|---|---|---|---|---|---|---|
3876
Lisata Therapeutics
LSTA
$10.4M
| $5K | ﹤0.01% |
33
| – | – |
|
3877
PUT
Landstar System
LSTR
$6.07B
| $5K | ﹤0.01% |
24
-51
| -68% | -$3.14K |
|
3878
PUT
Marriott International
MAR
$100B
| $5K | ﹤0.01% |
46
-215
| -82% | -$15.6K |
|
3879
Myers Industries
MYE
$1.23B
| $5K | ﹤0.01% |
+381
| New | +$5.53K |
|
3880
PUT
Norwegian Cruise Line
NCLH
$9.55B
| $5K | ﹤0.01% |
27
+14
| +108% | +$824 |
|
3881
CALL
Newmont
NEM
$95.2B
| $5K | ﹤0.01% |
146
-799
| -85% | -$14.7K |
|
3882
CALL
NETGEAR
NTGR
$618M
| $5K | ﹤0.01% |
+32
| New | +$1.29K |
|
3883
CALL
Nexstar Media Group
NXST
$5.96B
| $5K | ﹤0.01% |
11
-24
| -69% | -$1.33K |
|
3884
PUT
Universal Display
OLED
$3.73B
| $5K | ﹤0.01% |
158
+143
| +953% | +$6.3K |
|
3885
Old National Bancorp
ONB
$10.3B
| $5K | ﹤0.01% |
392
-36
| -8% | -$509 |
|
3886
CALL
Plains GP Holdings
PAGP
$5.28B
| $5K | ﹤0.01% |
+51
| New | +$1.78K |
|
3887
PUT
Paychex
PAYX
$44.1B
| $5K | ﹤0.01% |
155
+120
| +343% | +$6.27K |
|
3888
Pegasystems
PEGA
$5.04B
| $5K | ﹤0.01% |
+414
| New | +$5.74K |
|
3889
PUT
Parker-Hannifin
PH
$120B
| $5K | ﹤0.01% |
29
-229
| -89% | -$23.2K |
|
|
IMVP
3890
Invesco India ETF
IMVP
$124M
| $5K | ﹤0.01% |
+266
| New | +$5.21K |
|
3891
QuickLogic
QUIK
$212M
| $5K | ﹤0.01% |
367
+356
| +3,236% | +$6.82K |
|
3892
CALL
Repligen
RGEN
$6.99B
| $5K | ﹤0.01% |
+34
| New | +$981 |
|
|
3893
PUT
Repligen
RGEN
$6.99B
| $5K | ﹤0.01% |
24
+17
| +243% | +$490 |
|
3894
PUT
Rithm Capital
RITM
$5.57B
| $5K | ﹤0.01% |
31
+28
| +933% | +$346 |
|
3895
PUT
ResMed
RMD
$31B
| $5K | ﹤0.01% |
6
-15
| -71% | -$846 |
|
3896
CALL
Range Resources
RRC
$9.28B
| $5K | ﹤0.01% |
316
+64
| +25% | +$1.9K |
|
3897
PUT
Rayonier Advanced Materials
RYAM
$574M
| $5K | ﹤0.01% |
90
-23
| -20% | -$214 |
|
3898
Scholastic
SCHL
$773M
| $5K | ﹤0.01% |
130
-107
| -45% | -$4.32K |
|
|
3899
PUT
Scholastic
SCHL
$773M
| $5K | ﹤0.01% |
+36
| New | +$1.45K |
|
|
SHOE
3900
Shoe Station Group
SHOE
$418M
| $5K | ﹤0.01% |
+502
| New | +$5.57K |
|
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.