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 | |
|---|---|---|---|---|---|---|
451
CALL
NetEase
NTES
$76.9B
| $478K | 0.04% |
955
-70
| -7% | -$2.18K |
|
452
CALL
Delta Air Lines
DAL
$53.9B
| $476K | 0.04% |
1,886
+255
| +16% | +$12.6K |
|
453
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
| $476K | 0.04% |
1,319
+170
| +15% | +$44.2K |
|
454
Plains GP Holdings
PAGP
$5.25B
| $475K | 0.04% |
18,899
+17,780
| +1,589% | +$622K |
|
|
XEC
455
DELISTED
CIMAREX ENERGY CO
XEC
| $475K | 0.04% |
5,317
+2,718
| +105% | +$302K |
|
456
Costco
COST
$411B
| $474K | 0.04% |
+2,940
| New | +$465K |
|
|
QIHU
457
CALL
DELISTED
QIHOO 360 TECHNOLOGY CO LTD ADS RPSTG 3 CL A SHS
QIHU
| $472K | 0.04% |
1,297
+411
| +46% | +$25.9K |
|
458
PUT
Cleveland-Cliffs
CLF
$6.25B
| $471K | 0.04% |
516
+198
| +62% | +$485 |
|
459
CALL
Wynn Resorts
WYNN
$10B
| $470K | 0.04% |
1,520
-117
| -7% | -$7.82K |
|
460
Insmed
INSM
$23.3B
| $465K | 0.04% |
25,643
+18,536
| +261% | +$327K |
|
|
SPLK
461
DELISTED
Splunk Inc
SPLK
| $465K | 0.04% |
7,916
-13,385
| -63% | -$767K |
|
462
PUT
Melco Resorts & Entertainment
MLCO
$2.16B
| $464K | 0.04% |
410
+235
| +134% | +$4.01K |
|
|
MOMO
463
Hello Group
MOMO
$870M
| $462K | 0.04% |
28,881
+23,147
| +404% | +$321K |
|
|
SAFM
464
DELISTED
Sanderson Farms Inc
SAFM
| $460K | 0.04% |
5,940
+1,298
| +28% | +$93.4K |
|
465
Charter Communications
CHTR
$15.6B
| $459K | 0.04% |
2,507
-1,209
| -33% | -$224K |
|
466
Abercrombie & Fitch
ANF
$4.04B
| $456K | 0.04% |
16,917
-21,671
| -56% | -$503K |
|
467
Dollar Tree
DLTR
$22.6B
| $454K | 0.04% |
5,882
+3,298
| +128% | +$231K |
|
|
PXD
468
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $454K | 0.04% |
859
-343
| -29% | -$47.1K |
|
|
WLL
469
PUT
DELISTED
Whiting Petroleum Corporation
WLL
| $453K | 0.04% |
1
-1
| -50% | -$4.75K |
|
470
Eli Lilly
LLY
$1.06T
| $452K | 0.04% |
5,366
+2,685
| +100% | +$223K |
|
|
BZUN
471
Baozun
BZUN
$143M
| $451K | 0.04% |
+54,972
| New | +$403K |
|
472
Alaunos Therapeutics
TCRT
$4.69M
| $449K | 0.04% |
360
+123
| +52% | +$203K |
|
|
GNC
473
DELISTED
GNC Holdings, Inc.
GNC
| $448K | 0.04% |
+14,445
| New | +$487K |
|
|
IMOS
474
ChipMOS TECHNOLOGIES
IMOS
$2.08B
| $446K | 0.03% |
20,449
+9,445
| +86% | +$192K |
|
475
Reinsurance Group of America
RGA
$15.3B
| $445K | 0.03% |
5,210
+1,812
| +53% | +$164K |
|
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.