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 | |
|---|---|---|---|---|---|---|
3951
Annexon
ANNX
$793M
| $453K | ﹤0.01% |
63,295
+56,542
| +837% | +$294K |
|
3952
Gogo Inc
GOGO
$515M
| $453K | ﹤0.01% |
+51,669
| New | +$465K |
|
3953
iRhythm Holdings
IRTC
$3.96B
| $453K | ﹤0.01% |
+3,911
| New | +$440K |
|
3954
NovoCure
NVCR
$1.79B
| $453K | ﹤0.01% |
28,986
-27,125
| -48% | -$399K |
|
3955
Regions Financial
RF
$26.5B
| $449K | ﹤0.01% |
+21,375
| New | +$404K |
|
3956
PUT
Ashland
ASH
$3.3B
| $447K | ﹤0.01% |
4,600
+3,000
| +188% | +$269K |
|
|
FIRY
3957
PUT
Firy Inc
FIRY
$154M
| $447K | ﹤0.01% |
68,900
-32,000
| -32% | -$196K |
|
3958
CALL
Arhaus
ARHS
$1.08B
| $446K | ﹤0.01% |
29,000
+7,800
| +37% | +$100K |
|
|
DFTX
3959
PUT
Definium Therapeutics
DFTX
$5.61B
| $446K | ﹤0.01% |
47,500
+28,400
| +149% | +$162K |
|
3960
CALL
Quest Resource Holding
QRHC
$28M
| $446K | ﹤0.01% |
52,000
+21,800
| +72% | +$155K |
|
3961
CALL
Q2 Holdings
QTWO
$3.81B
| $446K | ﹤0.01% |
8,500
-3,200
| -27% | -$145K |
|
|
SWAV
3962
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $446K | ﹤0.01% |
1,371
-6,571
| -83% | -$1.61M |
|
3963
FerroAtlántica
GSM
$589M
| $445K | ﹤0.01% |
+89,555
| New | +$462K |
|
|
VRNA
3964
DELISTED
Verona Pharma
VRNA
| $445K | ﹤0.01% |
27,696
-30,726
| -53% | -$531K |
|
3965
Direxion Daily Aerospace & Defense Bull 3X ETF
DFEN
$378M
| $444K | ﹤0.01% |
16,666
+11,223
| +206% | +$262K |
|
3966
Ginkgo Bioworks
DNA
$493M
| $443K | ﹤0.01% |
9,551
+2,628
| +38% | +$136K |
|
3967
PUT
Procore
PCOR
$7.5B
| $443K | ﹤0.01% |
5,400
-4,400
| -45% | -$327K |
|
3968
CALL
Children's Place
PLCE
$53.8M
| $443K | ﹤0.01% |
38,400
-63,000
| -62% | -$1.19M |
|
3969
CALL
FormFactor
FORM
$6.54B
| $442K | ﹤0.01% |
9,700
+9,100
| +1,517% | +$379K |
|
3970
CALL
Invesco Mortgage Capital
IVR
$764M
| $441K | ﹤0.01% |
45,600
-80,400
| -64% | -$721K |
|
3971
Realty Income
O
$61.5B
| $441K | ﹤0.01% |
+8,164
| New | +$442K |
|
3972
CALL
Jasper Therapeutics
JSPR
$20.4M
| $440K | ﹤0.01% |
+15,000
| New | +$266K |
|
3973
CALL
Nordson
NDSN
$16.5B
| $439K | ﹤0.01% |
1,600
-3,400
| -68% | -$886K |
|
3974
uniQure
QURE
$2.75B
| $439K | ﹤0.01% |
84,587
+62,988
| +292% | +$361K |
|
|
EFC
3975
CALL
Ellington Financial
EFC
$1.69B
| $438K | ﹤0.01% |
37,100
+9,200
| +33% | +$111K |
|
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.