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 | Miscellaneous | 51.63% |
| 2 | Consumer Discretionary | 9.7% |
| 3 | Healthcare | 7.81% |
| 4 | Technology | 7.23% |
| 5 | Communication Services | 6.86% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
526
CALL
Costco
COST
$406B
| $392K | 0.03% |
525
-502
| -49% | -$79.3K |
|
527
PUT
Cummins
CMI
$77.2B
| $391K | 0.03% |
243
-23
| -9% | -$2.3K |
|
|
MXIM
528
DELISTED
Maxim Integrated Products
MXIM
| $388K | 0.03% |
+10,214
| New | +$391K |
|
529
JB Hunt Transport Services
JBHT
$25.7B
| $387K | 0.03% |
+5,286
| New | +$398K |
|
530
PUT
Stratasys
SSYS
$701M
| $387K | 0.03% |
213
+62
| +41% | +$1.63K |
|
|
SWIR
531
DELISTED
Sierra Wireless
SWIR
| $385K | 0.03% |
24,475
+8,976
| +58% | +$175K |
|
|
SGG
532
DELISTED
iPath Bloomberg Sugar Subindex Total Return ETN due June 24, 2038
SGG
| $384K | 0.03% |
+11,074
| New | +$369K |
|
533
Guidewire Software
GWRE
$13.5B
| $383K | 0.03% |
6,380
+4,393
| +221% | +$254K |
|
|
P
534
PUT
DELISTED
Pandora Media Inc
P
| $383K | 0.03% |
2,060
+760
| +58% | +$11.3K |
|
|
PPLI
535
People Inc
PPLI
$2.9B
| $382K | 0.03% |
35,682
+9,311
| +35% | +$108K |
|
|
VLRS
536
Controladora Vuela Compania de Aviacion
VLRS
$787M
| $381K | 0.03% |
22,250
+18,157
| +444% | +$310K |
|
537
PUT
Viatris
VTRS
$19.4B
| $381K | 0.03% |
1,786
-1,687
| -49% | -$81.1K |
|
538
Cisco
CSCO
$431B
| $380K | 0.03% |
+14,012
| New | +$387K |
|
539
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$346M
| $380K | 0.03% |
45
+37
| +463% | +$319K |
|
|
DYN
540
DELISTED
Dynegy, Inc.
DYN
| $380K | 0.03% |
28,409
+25,352
| +829% | +$435K |
|
|
IHS
541
DELISTED
IHS INC CL-A COM STK
IHS
| $380K | 0.03% |
3,209
+2,925
| +1,030% | +$349K |
|
542
MiMedx Group
MDXG
$666M
| $379K | 0.03% |
40,460
+37,417
| +1,230% | +$324K |
|
543
PUT
Oracle
ORCL
$457B
| $379K | 0.03% |
885
-975
| -52% | -$37.2K |
|
|
CRR
544
PUT
DELISTED
Carbo Ceramics Inc.
CRR
| $379K | 0.03% |
289
+21
| +8% | +$391 |
|
545
Equifax
EFX
$20.8B
| $378K | 0.03% |
3,397
+3,341
| +5,966% | +$361K |
|
546
PUT
RTX Corp
RTX
$271B
| $378K | 0.03% |
1,057
-460
| -30% | -$27.8K |
|
547
Williams-Sonoma
WSM
$26.8B
| $378K | 0.03% |
+12,958
| New | +$444K |
|
548
PUT
GE Aerospace
GE
$350B
| $376K | 0.03% |
482
+98
| +26% | +$13.9K |
|
|
WBA
549
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $376K | 0.03% |
2,034
-620
| -23% | -$52.7K |
|
550
CALL
Illumina
ILMN
$33B
| $375K | 0.03% |
255
-50
| -16% | -$8.07K |
|
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 deployed $39.7M of net new capital in Q4 2015, opening 1,415 new positions and adding to 1,993 existing holdings. Its largest new stake was Chipotle Mexican Grill: 1,548,150 shares worth $14.9M.
By sector, the portfolio is most concentrated in Miscellaneous at 52% of assets, down from 65% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $13.8M trimmed.
- 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 1,415 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.