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
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3001
PUT
Dime Commercial Bancshares
DCOM
$1.75B
| $808K | ﹤0.01% |
30,000
+18,100
| +152% | +$474K |
|
3002
BGC Group
BGC
$5.58B
| $807K | ﹤0.01% |
78,920
+50,826
| +181% | +$467K |
|
|
GPGI
3003
CALL
GPGI Inc
GPGI
$4.06B
| $807K | ﹤0.01% |
64,100
-55,500
| -46% | -$680K |
|
3004
CALL
Vor Biopharma
VOR
$1.04B
| $806K | ﹤0.01% |
+24,905
| New | +$220K |
|
3005
Philips
PHG
$25.4B
| $805K | ﹤0.01% |
34,838
-107,969
| -76% | -$2.42M |
|
3006
PUT
Idexx Laboratories
IDXX
$42.9B
| $804K | ﹤0.01% |
1,500
+800
| +114% | +$383K |
|
3007
PUT
Agree Realty
ADC
$9.68B
| $803K | ﹤0.01% |
11,000
-200
| -2% | -$15K |
|
|
ARR
3008
Armour Residential REIT
ARR
$2.02B
| $803K | ﹤0.01% |
47,771
+34,653
| +264% | +$556K |
|
3009
PUT
Digital Turbine
APPS
$1.02B
| $802K | ﹤0.01% |
136,000
+23,600
| +21% | +$97K |
|
|
GRAL
3010
PUT
GRAIL Inc
GRAL
$2.91B
| $802K | ﹤0.01% |
15,600
-18,000
| -54% | -$652K |
|
|
CVSA
3011
CALL
Covista Inc
CVSA
$3.94B
| $801K | ﹤0.01% |
6,300
-13,000
| -67% | -$1.54M |
|
3012
PUT
B&G Foods
BGS
$285M
| $801K | ﹤0.01% |
189,400
+62,600
| +49% | +$327K |
|
3013
CALL
Ameriprise Financial
AMP
$46.8B
| $800K | ﹤0.01% |
1,500
-1,600
| -52% | -$791K |
|
3014
Arvinas
ARVN
$518M
| $800K | ﹤0.01% |
108,800
+23,718
| +28% | +$175K |
|
3015
PUT
American Superconductor
AMSC
$1.48B
| $799K | ﹤0.01% |
21,800
+3,600
| +20% | +$88.5K |
|
3016
CALL
Cerence
CRNC
$382M
| $799K | ﹤0.01% |
78,300
-13,700
| -15% | -$121K |
|
3017
CALL
GCM Grosvenor
GCMG
$737M
| $799K | ﹤0.01% |
69,200
-7,000
| -9% | -$86.6K |
|
3018
Alkami Technology
ALKT
$1.8B
| $797K | ﹤0.01% |
26,453
+26,344
| +24,169% | +$732K |
|
3019
CALL
GFL Environmental
GFL
$14.3B
| $797K | ﹤0.01% |
15,800
-10,100
| -39% | -$496K |
|
3020
Nice
NICE
$5.29B
| $797K | ﹤0.01% |
4,719
-41,732
| -90% | -$6.72M |
|
|
SCPH
3021
CALL
DELISTED
scPharmaceuticals
SCPH
| $797K | ﹤0.01% |
209,300
+178,800
| +586% | +$555K |
|
3022
ProShares Ultra Bitcoin ETF
BITU
$354M
| $797K | ﹤0.01% |
+15,411
| New | +$701K |
|
|
VOYG
3023
CALL
Voyager Technologies
VOYG
$1.5B
| $796K | ﹤0.01% |
+20,300
| New | +$968K |
|
3024
PUT
DigitalBridge
DBRG
$2.94B
| $794K | ﹤0.01% |
76,800
+54,500
| +244% | +$520K |
|
3025
Redwire
RDW
$2.08B
| $794K | ﹤0.01% |
+48,768
| New | +$635K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.