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 | |
|---|---|---|---|---|---|---|
3101
CALL
ImmunityBio
IBRX
$7.32B
| $609K | ﹤0.01% |
219,100
+163,100
| +291% | +$461K |
|
3102
Krystal Biotech
KRYS
$10.4B
| $609K | ﹤0.01% |
+5,189
| New | +$530K |
|
|
SAFE
3103
Safehold
SAFE
$1.19B
| $608K | ﹤0.01% |
25,658
+1,399
| +6% | +$37.1K |
|
3104
CALL
Weibo
WB
$1.92B
| $608K | ﹤0.01% |
46,400
-10,100
| -18% | -$160K |
|
|
SCPH
3105
PUT
DELISTED
scPharmaceuticals
SCPH
| $607K | ﹤0.01% |
59,600
+50,000
| +521% | +$522K |
|
3106
CALL
Olin
OLN
$2.49B
| $606K | ﹤0.01% |
11,800
-12,900
| -52% | -$686K |
|
|
BLUE
3107
PUT
DELISTED
bluebird bio
BLUE
| $605K | ﹤0.01% |
9,205
-6,055
| -40% | -$443K |
|
3108
CALL
Capital Southwest
CSWC
$1.46B
| $605K | ﹤0.01% |
30,700
+15,300
| +99% | +$282K |
|
3109
PUT
CoreCivic
CXW
$3.09B
| $605K | ﹤0.01% |
64,300
-14,600
| -19% | -$133K |
|
3110
Jackson Financial
JXN
$8.44B
| $605K | ﹤0.01% |
19,790
+19,226
| +3,409% | +$619K |
|
3111
PUT
Quest Diagnostics
DGX
$25.6B
| $604K | ﹤0.01% |
4,300
-5,600
| -57% | -$772K |
|
3112
Global Payments
GPN
$23B
| $604K | ﹤0.01% |
6,138
-14,896
| -71% | -$1.53M |
|
3113
Healthpeak Properties
DOC
$15.5B
| $603K | ﹤0.01% |
+30,007
| New | +$623K |
|
3114
CALL
Cullen/Frost Bankers
CFR
$10.3B
| $602K | ﹤0.01% |
5,600
+4,400
| +367% | +$460K |
|
|
SF
3115
CALL
Stifel
SF
$12.5B
| $602K | ﹤0.01% |
15,150
-1,050
| -6% | -$41K |
|
3116
CALL
Archer Aviation
ACHR
$3.78B
| $601K | ﹤0.01% |
145,900
+38,800
| +36% | +$110K |
|
3117
CALL
Burford Capital
BUR
$922M
| $601K | ﹤0.01% |
49,400
-8,500
| -15% | -$110K |
|
3118
CALL
Neogen
NEOG
$2.03B
| $600K | ﹤0.01% |
27,600
+8,100
| +42% | +$146K |
|
3119
CALL
NuScale Power
SMR
$2.96B
| $599K | ﹤0.01% |
88,200
-50,000
| -36% | -$406K |
|
3120
CALL
Oscar Health
OSCR
$8.54B
| $598K | ﹤0.01% |
74,200
+12,200
| +20% | +$90K |
|
3121
CALL
Rhythm Pharmaceuticals
RYTM
$7.28B
| $598K | ﹤0.01% |
36,300
+23,100
| +175% | +$417K |
|
3122
PUT
Lumen
LUMN
$6.45B
| $597K | ﹤0.01% |
264,500
-176,500
| -40% | -$389K |
|
3123
CALL
BRC Group Holdings
RILY
$273M
| $597K | ﹤0.01% |
13,000
-900
| -6% | -$31.7K |
|
3124
CALL
Banco Macro
BMA
$5.89B
| $596K | ﹤0.01% |
22,600
+10,100
| +81% | +$202K |
|
3125
ARK Blockchain & Fintech Innovation ETF
ARKF
$742M
| $595K | ﹤0.01% |
+28,489
| New | +$541K |
|
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.