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 | |
|---|---|---|---|---|---|---|
5951
CALL
Church & Dwight Co
CHD
$23.7B
| $48K | ﹤0.01% |
500
-3,500
| -88% | -$345K |
|
5952
CALL
Chemed
CHE
$7.16B
| $48K | ﹤0.01% |
+100
| New | +$57K |
|
|
5953
PUT
Chemed
CHE
$7.16B
| $48K | ﹤0.01% |
+100
| New | +$57K |
|
|
CMCM
5954
Cheetah Mobile
CMCM
$87.2M
| $48K | ﹤0.01% |
10,327
+9,871
| +2,165% | +$39.8K |
|
5955
PUT
Americold
COLD
$4.21B
| $48K | ﹤0.01% |
2,900
-25,100
| -90% | -$455K |
|
|
CRON
5956
Cronos Group
CRON
$1.07B
| $48K | ﹤0.01% |
+25,222
| New | +$47.8K |
|
5957
PUT
Corvus Pharmaceuticals
CRVS
$1.1B
| $48K | ﹤0.01% |
12,000
-99,800
| -89% | -$363K |
|
5958
CXApp
CXAI
$12.9M
| $48K | ﹤0.01% |
45,034
+42,792
| +1,909% | +$45.3K |
|
5959
PUT
Dakota Gold
DC
$617M
| $48K | ﹤0.01% |
13,200
+2,600
| +25% | +$8.13K |
|
|
GAMB
5960
PUT
DELISTED
Gambling.com
GAMB
| $48K | ﹤0.01% |
+4,100
| New | +$50.5K |
|
5961
CALL
Goldman Sachs BDC
GSBD
$997M
| $48K | ﹤0.01% |
4,300
-7,000
| -62% | -$77.2K |
|
5962
IDT Corp
IDT
$1.67B
| $48K | ﹤0.01% |
716
+206
| +40% | +$11.8K |
|
5963
CALL
Insteel Industries
IIIN
$592M
| $48K | ﹤0.01% |
+1,300
| New | +$43.4K |
|
5964
PUT
Coca-Cola Femsa
KOF
$22.5B
| $48K | ﹤0.01% |
500
-100
| -17% | -$9.48K |
|
5965
Klaviyo
KVYO
$5.8B
| $48K | ﹤0.01% |
+1,454
| New | +$46.1K |
|
5966
CALL
Pediatrix Medical
MD
$2.2B
| $48K | ﹤0.01% |
3,400
-14,100
| -81% | -$193K |
|
5967
MakeMyTrip
MMYT
$5.38B
| $48K | ﹤0.01% |
492
-6,171
| -93% | -$622K |
|
5968
Nordson
NDSN
$16.4B
| $48K | ﹤0.01% |
+227
| New | +$45.2K |
|
|
NFGC
5969
CALL
New Found Gold
NFGC
$526M
| $48K | ﹤0.01% |
+34,300
| New | +$44.2K |
|
5970
CALL
NGL Energy Partners
NGL
$1.94B
| $48K | ﹤0.01% |
11,400
-27,000
| -70% | -$96.8K |
|
5971
One Stop Systems
OSS
$269M
| $48K | ﹤0.01% |
13,558
-3,742
| -22% | -$10.4K |
|
5972
Ouster
OUST
$2.11B
| $48K | ﹤0.01% |
2,017
-36,779
| -95% | -$447K |
|
|
PBT
5973
CALL
Permian Basin Royalty Trust
PBT
$1.36B
| $48K | ﹤0.01% |
3,900
-95,100
| -96% | -$1.01M |
|
5974
PUT
PTC Therapeutics
PTCT
$6.18B
| $48K | ﹤0.01% |
1,000
+300
| +43% | +$14.2K |
|
|
RC
5975
CALL
Ready Capital
RC
$260M
| $48K | ﹤0.01% |
11,000
-56,300
| -84% | -$250K |
|
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.