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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
NVEI
4001
DELISTED
Nuvei Corporation Subordinate Voting Shares
NVEI
| $374K | ﹤0.01% |
14,259
+7,733
| +118% | +$148K |
|
4002
CALL
Alkami Technology
ALKT
$1.94B
| $373K | ﹤0.01% |
15,400
+12,000
| +353% | +$250K |
|
4003
ARS Pharmaceuticals
SPRY
$563M
| $373K | ﹤0.01% |
68,157
+42,006
| +161% | +$184K |
|
|
AMPS
4004
DELISTED
Altus Power
AMPS
| $373K | ﹤0.01% |
54,713
-9,692
| -15% | -$52.5K |
|
|
NVTA
4005
CALL
DELISTED
Invitae Corporation
NVTA
| $373K | ﹤0.01% |
596,600
+183,500
| +44% | +$110K |
|
4006
MBIA
MBI
$278M
| $372K | ﹤0.01% |
60,860
-14,428
| -19% | -$116K |
|
4007
AGNC Investment
AGNC
$12.9B
| $371K | ﹤0.01% |
37,855
-183,847
| -83% | -$1.62M |
|
4008
CALL
Radian Group
RDN
$5.22B
| $371K | ﹤0.01% |
13,000
-7,000
| -35% | -$184K |
|
4009
Costamare
CMRE
$1.86B
| $370K | ﹤0.01% |
35,623
-17,046
| -32% | -$163K |
|
4010
PUT
HighPeak Energy
HPK
$811M
| $370K | ﹤0.01% |
26,000
+1,900
| +8% | +$30.1K |
|
4011
Phreesia
PHR
$671M
| $369K | ﹤0.01% |
15,949
+14,001
| +719% | +$242K |
|
|
LEV
4012
CALL
DELISTED
The Lion Electric Company
LEV
| $369K | ﹤0.01% |
208,900
-97,200
| -32% | -$169K |
|
4013
Direxion Daily S&P Biotech Bear 3X ETF
LABD
$67.8M
| $368K | ﹤0.01% |
+3,800
| New | +$739K |
|
4014
PUT
Middleby
MIDD
$6.11B
| $367K | ﹤0.01% |
2,500
+400
| +19% | +$50.8K |
|
4015
Photronics
PLAB
$1.72B
| $367K | ﹤0.01% |
11,709
-6,340
| -35% | -$141K |
|
|
4016
PUT
Photronics
PLAB
$1.72B
| $367K | ﹤0.01% |
11,700
+5,100
| +77% | +$113K |
|
4017
CALL
UMB Financial
UMBF
$10.9B
| $367K | ﹤0.01% |
4,400
+3,400
| +340% | +$239K |
|
|
UNIT
4018
CALL
Uniti Group
UNIT
$2.53B
| $367K | ﹤0.01% |
63,500
+3,100
| +5% | +$15.7K |
|
4019
Vanguard Total International Bond ETF
BNDX
$82.3B
| $366K | ﹤0.01% |
7,417
+7,109
| +2,308% | +$346K |
|
4020
CALL
SELLAS Life Sciences
SLS
$1.98B
| $366K | ﹤0.01% |
345,400
+122,600
| +55% | +$133K |
|
4021
PUT
XPEL
XPEL
$1.21B
| $366K | ﹤0.01% |
6,800
+6,400
| +1,600% | +$344K |
|
4022
Marqeta
MQ
$1.9B
| $365K | ﹤0.01% |
13,082
+2,478
| +23% | +$59.4K |
|
4023
PUT
Paysafe
PSFE
$463M
| $365K | ﹤0.01% |
28,600
-1,100
| -4% | -$12.2K |
|
|
FLNA
4024
CALL
Filana Therapeutics
FLNA
$42.7M
| $365K | ﹤0.01% |
162,200
-78,000
| -32% | -$1.65M |
|
4025
Invesco DB US Dollar Index Bearish Fund
UDN
$107M
| $365K | ﹤0.01% |
+19,835
| New | +$369K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.