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 | |
|---|---|---|---|---|---|---|
2351
First Bancorp
FBP
$4.4B
| $752K | ﹤0.01% |
71,066
+12,995
| +22% | +$136K |
|
|
CTRA
2352
DELISTED
Coterra Energy
CTRA
| $751K | ﹤0.01% |
+43,182
| New | +$750K |
|
|
ARR
2353
PUT
Armour Residential REIT
ARR
$2.02B
| $748K | ﹤0.01% |
84
+58
| +223% | +$4.96K |
|
2354
CALL
Deluxe
DLX
$1.19B
| $748K | ﹤0.01% |
150
+83
| +124% | +$4.13K |
|
|
MIC
2355
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $747K | ﹤0.01% |
17,442
-3,105
| -15% | -$128K |
|
2356
CALL
Trex
TREX
$4.51B
| $746K | ﹤0.01% |
166
-166
| -50% | -$7.31K |
|
|
LCI
2357
CALL
DELISTED
Lannett Company, Inc.
LCI
| $746K | ﹤0.01% |
212
-190
| -47% | -$7.73K |
|
2358
CALL
PetMed Express
PETS
$42.5M
| $745K | ﹤0.01% |
317
-237
| -43% | -$5.31K |
|
|
SAND
2359
CALL
DELISTED
Sandstorm Gold
SAND
| $745K | ﹤0.01% |
1,001
+630
| +170% | +$4.1K |
|
2360
PUT
Universal Health Services
UHS
$9.43B
| $745K | ﹤0.01% |
52
-219
| -81% | -$31.2K |
|
2361
CALL
ScottsMiracle-Gro
SMG
$4.03B
| $743K | ﹤0.01% |
70
-63
| -47% | -$6.44K |
|
2362
SBA Communications
SBAC
$18.4B
| $742K | ﹤0.01% |
+3,079
| New | +$730K |
|
2363
Madrigal Pharmaceuticals
MDGL
$12.6B
| $741K | ﹤0.01% |
8,141
+1,084
| +15% | +$105K |
|
2364
Plains GP Holdings
PAGP
$5.23B
| $741K | ﹤0.01% |
39,125
+35,782
| +1,070% | +$671K |
|
|
AAWW
2365
CALL
DELISTED
Atlas Air Worldwide Holdings, Inc.
AAWW
| $741K | ﹤0.01% |
269
-106
| -28% | -$2.65K |
|
2366
Yeti Holdings
YETI
$3.82B
| $739K | ﹤0.01% |
+21,275
| New | +$670K |
|
|
OPLN
2367
CALL
Openlane
OPLN
$4.17B
| $738K | ﹤0.01% |
339
+156
| +85% | +$3.56K |
|
2368
CALL
Insulet
PODD
$11.3B
| $736K | ﹤0.01% |
43
-4
| -9% | -$666 |
|
|
LL
2369
DELISTED
LL Flooring Holdings, Inc.
LL
| $736K | ﹤0.01% |
+75,378
| New | +$705K |
|
2370
Gentex
GNTX
$4.88B
| $732K | ﹤0.01% |
+25,292
| New | +$712K |
|
2371
PUT
Viper Energy
VNOM
$8.81B
| $732K | ﹤0.01% |
297
-27
| -8% | -$677 |
|
2372
CALL
MasTec
MTZ
$26.7B
| $731K | ﹤0.01% |
114
+65
| +133% | +$4.28K |
|
2373
PUT
Monolithic Power Systems
MPWR
$65.5B
| $729K | ﹤0.01% |
41
-39
| -49% | -$6.23K |
|
2374
Factset
FDS
$9.05B
| $728K | ﹤0.01% |
+2,717
| New | +$698K |
|
2375
PUT
Heron Therapeutics
HRTX
$86.3M
| $728K | ﹤0.01% |
310
+198
| +177% | +$4.38K |
|
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.