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
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2901
PUT
MKS Inc
MKSI
$22.2B
| $429K | ﹤0.01% |
39
-49
| -56% | -$5.13K |
|
2902
PUT
Sunrun
RUN
$2.37B
| $429K | ﹤0.01% |
311
+66
| +27% | +$984 |
|
2903
CALL
Varonis Systems
VRNS
$5.25B
| $427K | ﹤0.01% |
165
+75
| +83% | +$1.78K |
|
|
REV
2904
DELISTED
Revlon, Inc.
REV
| $427K | ﹤0.01% |
19,966
+13,036
| +188% | +$314K |
|
2905
CALL
Frontdoor
FTDR
$5.02B
| $426K | ﹤0.01% |
90
+38
| +73% | +$1.78K |
|
2906
PUT
Antero Resources
AR
$10.9B
| $425K | ﹤0.01% |
1,494
+1,030
| +222% | +$2.63K |
|
2907
PUT
Dine Brands
DIN
$432M
| $425K | ﹤0.01% |
51
+1
| +2% | +$78 |
|
2908
PUT
Linde
LIN
$237B
| $425K | ﹤0.01% |
20
-421
| -95% | -$84.8K |
|
2909
CALL
Tactile Systems Technology
TCMD
$620M
| $425K | ﹤0.01% |
63
+55
| +688% | +$3.04K |
|
|
VRS
2910
PUT
DELISTED
Verso Corporation
VRS
| $425K | ﹤0.01% |
236
+201
| +574% | +$3.23K |
|
2911
PUT
AngloGold Ashanti
AU
$40.3B
| $424K | ﹤0.01% |
190
+50
| +36% | +$1.01K |
|
|
MPT
2912
CALL
Medical Properties Trust
MPT
$2.89B
| $424K | ﹤0.01% |
201
-238
| -54% | -$4.82K |
|
|
STOR
2913
PUT
DELISTED
STORE Capital Corporation
STOR
| $424K | ﹤0.01% |
114
+76
| +200% | +$2.94K |
|
2914
PUT
Snap-on
SNA
$20.9B
| $423K | ﹤0.01% |
25
-235
| -90% | -$38.3K |
|
2915
PUT
Winnebago Industries
WGO
$870M
| $423K | ﹤0.01% |
80
-69
| -46% | -$3.23K |
|
|
TVRD
2916
CALL
Tvardi Therapeutics
TVRD
$23.5M
| $423K | ﹤0.01% |
7
+4
| +133% | +$2.81K |
|
2917
PUT
Church & Dwight Co
CHD
$23.1B
| $422K | ﹤0.01% |
60
-70
| -54% | -$4.97K |
|
2918
Direxion Daily S&P Biotech Bear 3X ETF
LABD
$66.7M
| $422K | ﹤0.01% |
171
+77
| +82% | +$273K |
|
2919
PUT
Sabesp
SBS
$19.7B
| $422K | ﹤0.01% |
1,449
+939
| +184% | +$2.41K |
|
2920
CALL
Wave Life Sciences
WVE
$1.12B
| $422K | ﹤0.01% |
527
+526
| +52,600% | +$12.9K |
|
2921
CALL
Brookfield
BN
$102B
| $421K | ﹤0.01% |
205
-647
| -76% | -$12.9K |
|
|
CNXM
2922
CALL
DELISTED
CNX Midstream Partners LP
CNXM
| $421K | ﹤0.01% |
256
+150
| +142% | +$2.16K |
|
|
LTC
2923
CALL
LTC Properties
LTC
$2.16B
| $420K | ﹤0.01% |
94
+78
| +488% | +$3.75K |
|
2924
Teck Resources
TECK
$29.5B
| $420K | ﹤0.01% |
24,214
+24,014
| +12,007% | +$392K |
|
2925
PUT
Pathward Financial
CASH
$1.81B
| $419K | ﹤0.01% |
115
+114
| +11,400% | +$3.88K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.