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 | |
|---|---|---|---|---|---|---|
701
PUT
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.9M
| $5.83M | 0.01% |
454
+69
| +18% | +$8.62K |
|
702
PUT
KB Home
KBH
$3.38B
| $5.83M | 0.01% |
1,700
-53
| -3% | -$1.83K |
|
703
CALL
Westlake Corp
WLK
$9.71B
| $5.8M | 0.01% |
827
+204
| +33% | +$13.7K |
|
704
CALL
Omnicom Group
OMC
$22.4B
| $5.78M | 0.01% |
714
+59
| +9% | +$4.62K |
|
|
CLVS
705
CALL
DELISTED
Clovis Oncology, Inc.
CLVS
| $5.78M | 0.01% |
5,541
+2,245
| +68% | +$16.3K |
|
|
KFYP
706
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $5.76M | 0.01% |
1,184
+147
| +14% | +$4.01K |
|
|
WW
707
CALL
DELISTED
WW International
WW
| $5.76M | 0.01% |
1,507
+581
| +63% | +$22K |
|
708
CALL
Cardinal Health
CAH
$52.3B
| $5.76M | 0.01% |
1,138
+743
| +188% | +$38.4K |
|
709
PUT
Marriott International
MAR
$95.6B
| $5.75M | 0.01% |
380
-777
| -67% | -$104K |
|
710
CALL
DXC Technology
DXC
$1.49B
| $5.74M | 0.01% |
1,528
+98
| +7% | +$3.2K |
|
711
lululemon athletica
LULU
$12.6B
| $5.74M | 0.01% |
+24,758
| New | +$5.28M |
|
712
PUT
HubSpot
HUBS
$9.93B
| $5.72M | 0.01% |
361
+220
| +156% | +$33.7K |
|
713
PUT
Oneok
OKE
$58.4B
| $5.72M | 0.01% |
756
-35
| -4% | -$2.5K |
|
714
PUT
Ross Stores
ROST
$74.8B
| $5.72M | 0.01% |
491
+34
| +7% | +$3.83K |
|
715
CALL
Hartford Financial Services
HIG
$38.9B
| $5.71M | 0.01% |
940
-64
| -6% | -$3.84K |
|
716
PUT
Arrowhead Research
ARWR
$12.3B
| $5.68M | 0.01% |
896
+664
| +286% | +$32.9K |
|
717
CALL
BHP
BHP
$213B
| $5.67M | 0.01% |
1,162
-507
| -30% | -$23K |
|
|
HES
718
CALL
DELISTED
Hess
HES
| $5.67M | 0.01% |
848
-354
| -29% | -$23.2K |
|
719
PUT
Equinix
EQIX
$102B
| $5.66M | 0.01% |
97
-763
| -89% | -$429K |
|
720
CALL
Incyte
INCY
$23.2B
| $5.66M | 0.01% |
648
+184
| +40% | +$15.7K |
|
721
CALL
Travelers Companies
TRV
$78.6B
| $5.64M | 0.01% |
412
+138
| +50% | +$18.8K |
|
|
SBNY
722
PUT
DELISTED
Signature Bank
SBNY
| $5.64M | 0.01% |
413
+338
| +451% | +$42.3K |
|
723
CALL
Fastenal
FAST
$52.5B
| $5.63M | 0.01% |
3,050
+1,116
| +58% | +$19.9K |
|
724
PUT
Rio Tinto
RIO
$149B
| $5.63M | 0.01% |
948
-232
| -20% | -$12.6K |
|
725
CALL
Axalta
AXTA
$6.88B
| $5.62M | 0.01% |
1,850
-221
| -11% | -$6.51K |
|
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.