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 | |
|---|---|---|---|---|---|---|
4326
LoveSac
LOVE
$242M
| $119K | ﹤0.01% |
7,467
+4,440
| +147% | +$69.3K |
|
4327
CALL
Dorian LPG
LPG
$1.96B
| $119K | ﹤0.01% |
77
+21
| +38% | +$277 |
|
4328
PUT
MACOM Technology Solutions
MTSI
$17.4B
| $119K | ﹤0.01% |
45
-90
| -67% | -$2.15K |
|
4329
CALL
Oceaneering
OII
$4.64B
| $119K | ﹤0.01% |
80
+74
| +1,233% | +$1.03K |
|
4330
Plug Power
PLUG
$2.65B
| $119K | ﹤0.01% |
+37,865
| New | +$115K |
|
4331
Zions Bancorporation
ZION
$10.1B
| $119K | ﹤0.01% |
2,301
+1,559
| +210% | +$75.7K |
|
4332
Zai Lab
ZLAB
$2.07B
| $119K | ﹤0.01% |
2,867
+2,739
| +2,140% | +$101K |
|
|
SILV
4333
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $119K | ﹤0.01% |
+17,794
| New | +$105K |
|
|
YELL
4334
CALL
DELISTED
Yellow Corporation Common Stock
YELL
| $119K | ﹤0.01% |
468
-140
| -23% | -$480 |
|
4335
Arch Capital
ACGL
$35.7B
| $118K | ﹤0.01% |
+2,756
| New | +$114K |
|
4336
Axos Financial
AX
$5.58B
| $118K | ﹤0.01% |
+3,928
| New | +$115K |
|
4337
CorMedix
CRMD
$564M
| $118K | ﹤0.01% |
+16,318
| New | +$99.7K |
|
4338
CALL
Groupon
GRPN
$1.03B
| $118K | ﹤0.01% |
25
-24
| -49% | -$1.33K |
|
4339
CALL
Harrow
HROW
$1.44B
| $118K | ﹤0.01% |
152
+138
| +986% | +$799 |
|
4340
PUT
Liberty Latin America Class C
LILAK
$1.69B
| $118K | ﹤0.01% |
71
+53
| +294% | +$820 |
|
4341
PUT
Neurogene
NGNE
$672M
| $118K | ﹤0.01% |
+5
| New | +$498 |
|
4342
LiveRamp
RAMP
$2.29B
| $118K | ﹤0.01% |
+2,465
| New | +$111K |
|
4343
ScottsMiracle-Gro
SMG
$4.09B
| $118K | ﹤0.01% |
+1,120
| New | +$115K |
|
|
CDK
4344
DELISTED
CDK Global, Inc.
CDK
| $118K | ﹤0.01% |
+2,174
| New | +$112K |
|
4345
ANI Pharmaceuticals
ANIP
$1.86B
| $117K | ﹤0.01% |
1,904
-10,211
| -84% | -$676K |
|
4346
CALL
Identive
INVE
$61M
| $117K | ﹤0.01% |
209
+158
| +310% | +$799 |
|
4347
KLX Energy Services
KLXE
$43.1M
| $117K | ﹤0.01% |
+3,657
| New | +$136K |
|
4348
PUT
Medpace
MEDP
$16.3B
| $117K | ﹤0.01% |
14
-8
| -36% | -$619 |
|
4349
CALL
Mueller Water Products
MWA
$3.94B
| $117K | ﹤0.01% |
98
+14
| +17% | +$160 |
|
4350
NeoGenomics
NEO
$1.96B
| $117K | ﹤0.01% |
4,027
-7,487
| -65% | -$178K |
|
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.