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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4926
CALL
MBIA
MBI
$260M
| $188K | ﹤0.01% |
27,900
-69,600
| -71% | -$440K |
|
4927
PUT
Privia Health
PRVA
$2.99B
| $188K | ﹤0.01% |
+9,600
| New | +$203K |
|
4928
PUT
Portillo's
PTLO
$329M
| $188K | ﹤0.01% |
13,300
-9,600
| -42% | -$133K |
|
4929
The RealReal
REAL
$1.47B
| $188K | ﹤0.01% |
+48,123
| New | +$115K |
|
4930
Sotera Health
SHC
$5.1B
| $188K | ﹤0.01% |
15,670
-12,484
| -44% | -$186K |
|
4931
Transmedics
TMDX
$2.64B
| $188K | ﹤0.01% |
2,551
+2,284
| +855% | +$188K |
|
4932
CALL
Allison Transmission
ALSN
$9.55B
| $186K | ﹤0.01% |
2,300
+500
| +28% | +$33.7K |
|
|
4933
PUT
Allison Transmission
ALSN
$9.55B
| $186K | ﹤0.01% |
2,300
+2,100
| +1,050% | +$142K |
|
4934
PUT
Dycom Industries
DY
$12.1B
| $186K | ﹤0.01% |
1,300
-2,200
| -63% | -$271K |
|
|
MAG
4935
DELISTED
MAG Silver
MAG
| $186K | ﹤0.01% |
+17,621
| New | +$162K |
|
4936
Ring Energy
REI
$317M
| $186K | ﹤0.01% |
+95,198
| New | +$142K |
|
4937
PUT
SS&C Technologies
SSNC
$18.6B
| $186K | ﹤0.01% |
2,900
+100
| +4% | +$6.21K |
|
4938
BGC Group
BGC
$5.49B
| $185K | ﹤0.01% |
23,929
-4,179
| -15% | -$31K |
|
4939
Gildan
GIL
$10.3B
| $185K | ﹤0.01% |
4,997
+1,186
| +31% | +$40.3K |
|
4940
Host Hotels & Resorts
HST
$17.2B
| $185K | ﹤0.01% |
8,985
-2,126
| -19% | -$42.7K |
|
4941
PUT
Kilroy Realty
KRC
$4.52B
| $185K | ﹤0.01% |
5,100
-91,500
| -95% | -$3.38M |
|
4942
CALL
D-Wave Quantum Inc. Common Stock
QBTS
$6.74B
| $185K | ﹤0.01% |
90,800
+30,000
| +49% | +$42.2K |
|
4943
PUT
TMC The Metals Company
TMC
$1.54B
| $185K | ﹤0.01% |
130,000
+36,100
| +38% | +$50.3K |
|
|
LBPH
4944
PUT
DELISTED
Longboard Pharmaceuticals, Inc. Common Stock
LBPH
| $185K | ﹤0.01% |
+8,600
| New | +$188K |
|
4945
PUT
Alpha Pro Tech
APT
$50.6M
| $184K | ﹤0.01% |
29,600
-11,400
| -28% | -$62.4K |
|
4946
Daktronics
DAKT
$954M
| $184K | ﹤0.01% |
+18,546
| New | +$155K |
|
|
PLCY
4947
PUT
DELISTED
EventShares U.S. Legislative Opportunities ETF
PLCY
| $184K | ﹤0.01% |
11,100
+9,800
| +754% | +$162K |
|
4948
PUT
American Homes 4 Rent
AMH
$12.1B
| $183K | ﹤0.01% |
5,000
+3,800
| +317% | +$136K |
|
4949
Arcus Biosciences
RCUS
$3.53B
| $183K | ﹤0.01% |
9,723
-77,361
| -89% | -$1.34M |
|
4950
CALL
AXIS Capital
AXS
$7.71B
| $182K | ﹤0.01% |
2,800
+300
| +12% | +$18K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.