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 | |
|---|---|---|---|---|---|---|
3551
DexCom
DXCM
$28.3B
| $240K | ﹤0.01% |
4,400
-15,312
| -78% | -$726K |
|
3552
PUT
Nordic American Tanker
NAT
$1.37B
| $240K | ﹤0.01% |
488
+120
| +33% | +$457 |
|
3553
PUT
OneMain Financial
OMF
$7.08B
| $240K | ﹤0.01% |
57
+39
| +217% | +$1.58K |
|
3554
CALL
Quanta Services
PWR
$93.1B
| $240K | ﹤0.01% |
59
-53
| -47% | -$2.16K |
|
3555
WisdomTree
WT
$3.01B
| $240K | ﹤0.01% |
49,594
-36,415
| -42% | -$181K |
|
|
PSXP
3556
CALL
DELISTED
PHILLIPS 66 PARTNERS LP
PSXP
| $240K | ﹤0.01% |
39
-49
| -56% | -$2.77K |
|
3557
PUT
Harrow
HROW
$1.4B
| $239K | ﹤0.01% |
308
-729
| -70% | -$4.22K |
|
3558
Nu Skin
NUS
$250M
| $239K | ﹤0.01% |
5,840
+632
| +12% | +$25.8K |
|
3559
PUT
Star Bulk Carriers
SBLK
$3.02B
| $239K | ﹤0.01% |
203
+70
| +53% | +$757 |
|
|
ENDP
3560
DELISTED
Endo International plc
ENDP
| $239K | ﹤0.01% |
51,027
-26,464
| -34% | -$118K |
|
|
VRS
3561
DELISTED
Verso Corporation
VRS
| $239K | ﹤0.01% |
+13,308
| New | +$214K |
|
3562
PUT
Cardlytics
CDLX
$21.7M
| $238K | ﹤0.01% |
+4
| New | +$1.96K |
|
3563
PUT
Pediatrix Medical
MD
$2.15B
| $238K | ﹤0.01% |
86
+10
| +13% | +$251 |
|
3564
Signet Jewelers
SIG
$3.72B
| $238K | ﹤0.01% |
10,962
+3,405
| +45% | +$60.5K |
|
3565
CALL
Taylor Morrison
TMHC
| $238K | ﹤0.01% |
109
+78
| +252% | +$1.88K |
|
|
TSE
3566
CALL
DELISTED
Trinseo
TSE
| $238K | ﹤0.01% |
64
| – | – |
|
3567
PUT
Avnet
AVT
$7.25B
| $237K | ﹤0.01% |
56
+55
| +5,500% | +$2.27K |
|
3568
Acuity Brands
AYI
$10.1B
| $237K | ﹤0.01% |
+1,721
| New | +$221K |
|
3569
Clarivate
CLVT
$1.36B
| $237K | ﹤0.01% |
+14,144
| New | +$238K |
|
3570
CALL
HCI Group
HCI
$2.25B
| $237K | ﹤0.01% |
52
+37
| +247% | +$1.63K |
|
3571
Moelis & Co
MC
$5.04B
| $237K | ﹤0.01% |
7,425
+7,046
| +1,859% | +$231K |
|
3572
Sociedad Química y Minera de Chile
SQM
$19.6B
| $237K | ﹤0.01% |
8,909
-17,983
| -67% | -$474K |
|
3573
CALL
Vanguard FTSE Developed Markets ETF
VEA
$227B
| $237K | ﹤0.01% |
54
+36
| +200% | +$1.53K |
|
|
LGF.B
3574
CALL
DELISTED
Lions Gate Entertainment Corp. Class B Non-Voting Shares
LGF.B
| $237K | ﹤0.01% |
225
+167
| +288% | +$1.44K |
|
3575
ICU Medical
ICUI
$4.04B
| $236K | ﹤0.01% |
1,265
+891
| +238% | +$153K |
|
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.