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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3076
PUT
Cerence
CRNC
$375M
| $625K | ﹤0.01% |
21,400
-13,600
| -39% | -$373K |
|
3077
PUT
DigitalBridge
DBRG
$2.93B
| $625K | ﹤0.01% |
42,500
-13,500
| -24% | -$166K |
|
3078
CALL
Moelis & Co
MC
$5.04B
| $625K | ﹤0.01% |
13,800
+12,000
| +667% | +$479K |
|
3079
PUT
PubMatic
PUBM
$594M
| $625K | ﹤0.01% |
34,200
-31,100
| -48% | -$494K |
|
3080
CALL
Alliant Energy
LNT
$19.1B
| $624K | ﹤0.01% |
11,900
-12,500
| -51% | -$670K |
|
3081
CALL
Ionis Pharmaceuticals
IONS
$9.25B
| $623K | ﹤0.01% |
15,200
-35,300
| -70% | -$1.36M |
|
|
MZTI
3082
CALL
The Marzetti Company
MZTI
$2.95B
| $623K | ﹤0.01% |
+3,100
| New | +$629K |
|
3083
PUT
Endava
DAVA
$147M
| $621K | ﹤0.01% |
12,000
+11,700
| +3,900% | +$629K |
|
|
MAG
3084
CALL
DELISTED
MAG Silver
MAG
| $621K | ﹤0.01% |
55,800
+7,700
| +16% | +$95.8K |
|
3085
MBIA
MBI
$282M
| $621K | ﹤0.01% |
71,912
+55,182
| +330% | +$497K |
|
3086
Calix
CALX
$2.32B
| $620K | ﹤0.01% |
+12,426
| New | +$599K |
|
3087
PUT
Exelon
EXC
$48.2B
| $619K | ﹤0.01% |
15,200
-44,900
| -75% | -$1.86M |
|
3088
PUT
Microvision
MVIS
$88.8M
| $619K | ﹤0.01% |
135,200
+129,400
| +2,231% | +$453K |
|
3089
PUT
Artisan Partners
APAM
$2.86B
| $617K | ﹤0.01% |
15,700
-1,700
| -10% | -$58.7K |
|
3090
Ashland
ASH
$3.04B
| $616K | ﹤0.01% |
7,090
+5,462
| +336% | +$505K |
|
3091
CALL
Magna International
MGA
$18.3B
| $615K | ﹤0.01% |
10,900
-8,700
| -44% | -$461K |
|
3092
CALL
Alkami Technology
ALKT
$1.9B
| $614K | ﹤0.01% |
37,500
-2,500
| -6% | -$34.5K |
|
|
ORGN
3093
DELISTED
Origin Materials
ORGN
| $614K | ﹤0.01% |
4,807
+1,234
| +35% | +$159K |
|
3094
Post Holdings
POST
$4.14B
| $614K | ﹤0.01% |
7,094
+695
| +11% | +$61K |
|
3095
CALL
Sprott Junior Uranium Miners ETF
URNJ
$320M
| $614K | ﹤0.01% |
+18,300
| New | +$286K |
|
3096
CALL
Vanda Pharmaceuticals
VNDA
$314M
| $614K | ﹤0.01% |
93,200
+92,900
| +30,967% | +$596K |
|
3097
CALL
CACI
CACI
$11B
| $613K | ﹤0.01% |
+1,800
| New | +$559K |
|
|
FL
3098
DELISTED
Foot Locker
FL
| $612K | ﹤0.01% |
+22,582
| New | +$769K |
|
3099
PUT
Western Midstream Partners
WES
$19.3B
| $612K | ﹤0.01% |
23,100
+1,600
| +7% | +$42.1K |
|
3100
CALL
indie Semiconductor
INDI
$727M
| $610K | ﹤0.01% |
64,900
-11,900
| -15% | -$107K |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.