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 | |
|---|---|---|---|---|---|---|
3276
Digital Turbine
APPS
$1.04B
| $305K | ﹤0.01% |
42,915
+18,035
| +72% | +$134K |
|
3277
CALL
Regis Corp
RGS
$68.3M
| $305K | ﹤0.01% |
9
+2
| +29% | +$741 |
|
3278
CALL
KRONOS Worldwide
KRO
$705M
| $304K | ﹤0.01% |
227
+188
| +482% | +$2.46K |
|
|
CONN
3279
CALL
DELISTED
Conn's Inc.
CONN
| $304K | ﹤0.01% |
246
-96
| -28% | -$2.01K |
|
3280
CALL
Fidelity National Financial
FNF
$14B
| $303K | ﹤0.01% |
70
+19
| +37% | +$843 |
|
3281
CALL
MBIA
MBI
$282M
| $303K | ﹤0.01% |
326
-93
| -22% | -$884 |
|
3282
Universal Insurance Holdings
UVE
$1.21B
| $302K | ﹤0.01% |
10,824
-40,075
| -79% | -$1.16M |
|
3283
PUT
World Acceptance Corp
WRLD
$909M
| $302K | ﹤0.01% |
35
-38
| -52% | -$3.91K |
|
3284
PUT
National Vision
EYE
$1.66B
| $301K | ﹤0.01% |
93
-257
| -73% | -$7.07K |
|
3285
CALL
Natural Resource Partners
NRP
$1.3B
| $301K | ﹤0.01% |
150
+144
| +2,400% | +$3.33K |
|
3286
CALL
The RealReal
REAL
$1.4B
| $301K | ﹤0.01% |
160
-576
| -78% | -$11K |
|
|
BIG
3287
DELISTED
Big Lots, Inc.
BIG
| $301K | ﹤0.01% |
10,493
+6,256
| +148% | +$144K |
|
3288
CALL
Cloudflare
NET
$94.3B
| $300K | ﹤0.01% |
176
+85
| +93% | +$1.45K |
|
3289
Philips
PHG
$24.3B
| $300K | ﹤0.01% |
7,738
-10,644
| -58% | -$385K |
|
3290
PUT
UroGen Pharma
URGN
$2.02B
| $300K | ﹤0.01% |
90
-117
| -57% | -$3.19K |
|
|
DPLO
3291
DELISTED
DIPLOMAT PHARMACY, INC.
DPLO
| $300K | ﹤0.01% |
75,000
+69,114
| +1,174% | +$325K |
|
3292
CALL
AllianceBernstein
AB
$3.54B
| $299K | ﹤0.01% |
99
+57
| +136% | +$1.66K |
|
|
AXDX
3293
CALL
DELISTED
Accelerate Diagnostics
AXDX
| $299K | ﹤0.01% |
18
-63
| -78% | -$10.4K |
|
3294
Ciena
CIEN
$53.4B
| $299K | ﹤0.01% |
7,012
+2,972
| +74% | +$113K |
|
|
BBBY
3295
CALL
Bed Bath & Beyond
BBBY
$512M
| $298K | ﹤0.01% |
564
-386
| -41% | -$2.58K |
|
3296
PUT
The Greenbrier Companies
GBX
$1.56B
| $298K | ﹤0.01% |
92
-40
| -30% | -$1.2K |
|
3297
Dycom Industries
DY
$12.7B
| $297K | ﹤0.01% |
6,310
+2,970
| +89% | +$145K |
|
3298
PUT
Navios Maritime Partners
NMM
$2.21B
| $297K | ﹤0.01% |
160
+22
| +16% | +$410 |
|
3299
ProShares Short S&P500
SH
$916M
| $297K | ﹤0.01% |
3,097
-4,498
| -59% | -$454K |
|
3300
CALL
Community Health Systems
CYH
$383M
| $296K | ﹤0.01% |
1,021
+757
| +287% | +$2.62K |
|
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.