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 | |
|---|---|---|---|---|---|---|
4301
CALL
AMC Global Media
AMCX
$450M
| $122K | ﹤0.01% |
31
+7
| +29% | +$294 |
|
4302
CALL
Amkor Technology
AMKR
$10.6B
| $122K | ﹤0.01% |
94
+92
| +4,600% | +$1.1K |
|
|
BLD
4303
DELISTED
TopBuild
BLD
| $122K | ﹤0.01% |
1,191
-327
| -22% | -$34K |
|
4304
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$87.8M
| $122K | ﹤0.01% |
5,006
-17,513
| -78% | -$384K |
|
4305
GoDaddy
GDDY
$13.9B
| $122K | ﹤0.01% |
+1,806
| New | +$119K |
|
4306
RadNet
RDNT
$4.98B
| $122K | ﹤0.01% |
+6,047
| New | +$104K |
|
|
GSS
4307
CALL
DELISTED
Golden Star Resources Ltd.
GSS
| $122K | ﹤0.01% |
321
+112
| +54% | +$358 |
|
4308
PUT
AdvanSix
ASIX
$542M
| $121K | ﹤0.01% |
61
+58
| +1,933% | +$1.27K |
|
4309
PUT
Axos Financial
AX
$5.58B
| $121K | ﹤0.01% |
40
+21
| +111% | +$614 |
|
4310
CALL
Annaly Capital Management
NLY
$17.3B
| $121K | ﹤0.01% |
32
-52
| -62% | -$1.9K |
|
4311
CALL
Saic
SAIC
$4.95B
| $121K | ﹤0.01% |
14
-63
| -82% | -$5.27K |
|
4312
PUT
Starwood Property Trust
STWD
$6.12B
| $121K | ﹤0.01% |
49
-17
| -26% | -$416 |
|
4313
CALL
VirnetX Holding Corp
VHC
$53.8M
| $121K | ﹤0.01% |
16
-1
| -6% | -$100 |
|
|
GTT
4314
PUT
DELISTED
GTT Communications, Inc.
GTT
| $121K | ﹤0.01% |
107
+29
| +37% | +$243 |
|
4315
Arbutus Biopharma
ABUS
$847M
| $120K | ﹤0.01% |
43,344
+42,925
| +10,245% | +$69.5K |
|
4316
PUT
Axcelis
ACLS
$3.44B
| $120K | ﹤0.01% |
50
+47
| +1,567% | +$990 |
|
4317
Bloomin' Brands
BLMN
$754M
| $120K | ﹤0.01% |
5,457
-1,960
| -26% | -$41.6K |
|
4318
Costamare
CMRE
$1.85B
| $120K | ﹤0.01% |
12,610
+10,784
| +591% | +$86.1K |
|
|
CUK
4319
CALL
DELISTED
Carnival PLC
CUK
| $120K | ﹤0.01% |
25
-175
| -88% | -$7.4K |
|
4320
CALL
G-III Apparel Group
GIII
$1.54B
| $120K | ﹤0.01% |
36
-68
| -65% | -$1.93K |
|
4321
CALL
LGI Homes
LGIH
$1.35B
| $120K | ﹤0.01% |
17
-13
| -43% | -$989 |
|
4322
PUT
SITE Centers
SITC
$236M
| $120K | ﹤0.01% |
110
+104
| +1,733% | +$1.18K |
|
|
AMAG
4323
CALL
DELISTED
AMAG Pharmaceuticals
AMAG
| $120K | ﹤0.01% |
99
-46
| -32% | -$503 |
|
4324
Devon Energy
DVN
$51.3B
| $119K | ﹤0.01% |
4,600
-10,677
| -70% | -$240K |
|
4325
CALL
FMC
FMC
$1.25B
| $119K | ﹤0.01% |
14
-63
| -82% | -$5.86K |
|
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.