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 |
NVIDIA
NVDA
|
+$93M |
| 2 |
Citigroup
C
|
+$74.8M |
| 3 |
Pinduoduo
PDD
|
+$50.7M |
| 4 |
Intel
INTC
|
+$47.1M |
| 5 |
Broadcom
AVGO
|
+$46.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$94.5M |
| 2 |
Pfizer
PFE
|
+$66.4M |
| 3 |
Boeing
BA
|
+$61.6M |
| 4 |
PayPal
PYPL
|
+$42.2M |
| 5 |
GE Aerospace
GE
|
+$42M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.53% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.21% |
| 4 | Financials | 0.2% |
| 5 | Materials | 0.12% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
JNPR
3051
DELISTED
Juniper Networks
JNPR
| $879K | ﹤0.01% |
24,123
-13,488
| -36% | -$479K |
|
3052
CALL
Hawaiian Electric Industries
HE
$2.28B
| $878K | ﹤0.01% |
97,400
-45,100
| -32% | -$469K |
|
3053
PUT
Sensata Technologies
ST
$6.75B
| $878K | ﹤0.01% |
23,500
-112,200
| -83% | -$4.32M |
|
3054
TPG
TPG
$6.89B
| $878K | ﹤0.01% |
+21,196
| New | +$907K |
|
3055
CALL
Opendoor
OPEN
$3.71B
| $877K | ﹤0.01% |
493,003
-99,924
| -17% | -$216K |
|
3056
iShares MSCI Turkey ETF
TUR
$203M
| $876K | ﹤0.01% |
+20,870
| New | +$847K |
|
3057
CALL
Hess Midstream
HESM
$5.11B
| $874K | ﹤0.01% |
24,000
+1,600
| +7% | +$56.5K |
|
3058
PUT
Imperial Oil
IMO
$60.8B
| $873K | ﹤0.01% |
12,800
+12,600
| +6,300% | +$868K |
|
3059
CALL
Patterson-UTI
PTEN
$3.57B
| $873K | ﹤0.01% |
84,300
-66,200
| -44% | -$726K |
|
3060
CALL
Timken Company
TKR
$9.81B
| $873K | ﹤0.01% |
10,900
+4,700
| +76% | +$405K |
|
3061
CALL
Xenon Pharmaceuticals
XENE
$6.36B
| $873K | ﹤0.01% |
22,400
+7,400
| +49% | +$296K |
|
3062
CALL
BigBear.ai
BBAI
$1.36B
| $871K | ﹤0.01% |
576,900
-206,700
| -26% | -$323K |
|
|
HCP
3063
DELISTED
HashiCorp, Inc. Class A Common Stock
HCP
| $871K | ﹤0.01% |
+25,880
| New | +$805K |
|
3064
Alexandria Real Estate Equities
ARE
$8.96B
| $870K | ﹤0.01% |
7,443
-898
| -11% | -$107K |
|
3065
Bio-Rad Laboratories Class A
BIO
$8.47B
| $870K | ﹤0.01% |
+3,189
| New | +$928K |
|
3066
ProShares Ultra QQQ
QLD
$12.5B
| $870K | ﹤0.01% |
+17,448
| New | +$775K |
|
3067
CALL
Photronics
PLAB
$1.76B
| $868K | ﹤0.01% |
35,200
+1,500
| +4% | +$40.7K |
|
3068
PUT
Allegro MicroSystems
ALGM
$8.72B
| $866K | ﹤0.01% |
30,700
-108,100
| -78% | -$3.08M |
|
3069
PUT
AMN Healthcare
AMN
$1.3B
| $865K | ﹤0.01% |
16,900
+6,200
| +58% | +$351K |
|
3070
CALL
NovoCure
NVCR
$1.97B
| $865K | ﹤0.01% |
50,500
-80,700
| -62% | -$1.42M |
|
3071
CALL
Immatics
IMTX
$1.18B
| $864K | ﹤0.01% |
74,400
+36,500
| +96% | +$411K |
|
3072
CALL
Celanese
CE
$4.87B
| $863K | ﹤0.01% |
6,400
-17,600
| -73% | -$2.69M |
|
|
INFA
3073
DELISTED
Informatica
INFA
| $863K | ﹤0.01% |
27,970
+15,514
| +125% | +$489K |
|
3074
Martin Marietta Materials
MLM
$34.3B
| $863K | ﹤0.01% |
1,594
-4,179
| -72% | -$2.43M |
|
3075
PUT
Portillo's
PTLO
$338M
| $862K | ﹤0.01% |
88,700
+75,400
| +567% | +$840K |
|
Similar funds
Simplex Trading's Q2 2024 Portfolio in Review
As of Q2 2024, Simplex Trading held 10,213 positions worth $162B, down 6.5% from $173B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading withdrew a net $19.2B in Q2 2024, closing 1,431 positions and reducing 4,061 holdings. Its most notable exit was Boeing, an estimated $61.6M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.53% of assets, up from 0.38% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Citigroup worth $77M.
- Simplex Trading's largest Q2 2024 buy was Citigroup: 1,213,247 shares worth $77M.
- Simplex Trading added most to NVIDIA in Q2 2024, an estimated $93M increase.
- Simplex Trading's biggest Q2 2024 reduction was State Street Energy Select Sector SPDR ETF, cutting an estimated $94.5M.
- Simplex Trading fully exited Boeing in Q2 2024, selling an estimated $61.6M.
- Simplex Trading's ten largest holdings make up 50% of its $162B portfolio in Q2 2024.
- Simplex Trading opened 1,358 new positions and closed 1,431 in Q2 2024.
- Simplex Trading's portfolio value fell 6.5% quarter-over-quarter to $162B.
Based on Simplex Trading's 13F filing for Q2 2024, filed 25 Jul 2024.