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 | |
|---|---|---|---|---|---|---|
3726
CALL
Green Plains
GPRE
$1.14B
| $6K | ﹤0.01% |
+112
| New | +$2.37K |
|
|
3727
PUT
Green Plains
GPRE
$1.14B
| $6K | ﹤0.01% |
57
+51
| +850% | +$1.08K |
|
3728
PUT
Goodyear
GT
$2.1B
| $6K | ﹤0.01% |
116
+16
| +16% | +$525 |
|
3729
PUT
IAMGOLD
IAG
$8.1B
| $6K | ﹤0.01% |
47
+12
| +34% | +$20 |
|
3730
CALL
iShares Gold Trust
IAU
$63.2B
| $6K | ﹤0.01% |
36
-53
| -60% | -$1.13K |
|
3731
CALL
Infosys
INFY
$51.1B
| $6K | ﹤0.01% |
180
+74
| +70% | +$642 |
|
3732
CALL
Inogen
INGN
$174M
| $6K | ﹤0.01% |
10
+9
| +900% | +$381 |
|
|
3733
PUT
Inogen
INGN
$174M
| $6K | ﹤0.01% |
+6
| New | +$254 |
|
3734
PUT
IPG Photonics
IPGP
$3.4B
| $6K | ﹤0.01% |
47
-149
| -76% | -$12.8K |
|
3735
PUT
Kirby Corp
KEX
$7.07B
| $6K | ﹤0.01% |
+37
| New | +$2.29K |
|
3736
PUT
Kinross Gold
KGC
$27.9B
| $6K | ﹤0.01% |
276
-34
| -11% | -$67 |
|
3737
PUT
KLA
KLAC
$225B
| $6K | ﹤0.01% |
1,730
-520
| -23% | -$3.33K |
|
3738
CALL
Kennametal
KMT
$2.54B
| $6K | ﹤0.01% |
184
+19
| +12% | +$491 |
|
3739
CALL
LGI Homes
LGIH
$1.37B
| $6K | ﹤0.01% |
63
-44
| -41% | -$1.28K |
|
3740
CALL
El Pollo Loco
LOCO
$505M
| $6K | ﹤0.01% |
242
-131
| -35% | -$1.56K |
|
3741
PUT
LG Display
LPL
$2.8B
| $6K | ﹤0.01% |
119
+109
| +1,090% | +$1.09K |
|
3742
CALL
Louisiana-Pacific
LPX
$5.16B
| $6K | ﹤0.01% |
156
+58
| +59% | +$1K |
|
3743
Larimar Therapeutics
LRMR
$379M
| $6K | ﹤0.01% |
92
-821
| -90% | -$132K |
|
3744
PUT
LSB Industries
LXU
$832M
| $6K | ﹤0.01% |
+31
| New | +$256 |
|
3745
CALL
Manhattan Associates
MANH
$12.2B
| $6K | ﹤0.01% |
31
+26
| +520% | +$1.85K |
|
3746
PUT
News Corp Class B
NWS
$17.8B
| $6K | ﹤0.01% |
9
| – | – |
|
3747
PUT
Open Text
OTEX
$6.28B
| $6K | ﹤0.01% |
122
+80
| +190% | +$1.89K |
|
3748
CALL
Plains All American Pipeline
PAA
$17.6B
| $6K | ﹤0.01% |
119
-70
| -37% | -$1.89K |
|
3749
Pure Cycle
PCYO
$256M
| $6K | ﹤0.01% |
1,430
+1,130
| +377% | +$5.54K |
|
3750
CALL
PetMed Express
PETS
$42.3M
| $6K | ﹤0.01% |
+80
| New | +$1.34K |
|
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.