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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
676
CALL
Aon
AON
$75.2B
| $14.4M | 0.01% |
36,000
-8,900
| -20% | -$3.41M |
|
|
PPLC
677
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $14.3M | 0.01% |
953,400
+589,800
| +162% | +$8.88M |
|
678
PUT
General Mills
GIS
$19.7B
| $14.3M | 0.01% |
239,700
+159,000
| +197% | +$9.55M |
|
679
CALL
FirstEnergy
FE
$28.5B
| $14.3M | 0.01% |
353,900
+284,100
| +407% | +$11.3M |
|
680
PUT
American Electric Power
AEP
$72.4B
| $14.3M | 0.01% |
130,500
-23,100
| -15% | -$2.34M |
|
681
PUT
RH
RH
$3.31B
| $14.2M | 0.01% |
60,700
+3,800
| +7% | +$1.32M |
|
682
PUT
Kinder Morgan
KMI
$72.3B
| $14.2M | 0.01% |
497,200
-37,200
| -7% | -$1.03M |
|
683
PUT
Las Vegas Sands
LVS
$30B
| $14.2M | 0.01% |
366,500
-242,400
| -40% | -$10.7M |
|
|
OKLO
684
CALL
Oklo
OKLO
$7.74B
| $14.1M | 0.01% |
652,500
-62,400
| -9% | -$2.11M |
|
685
PUT
Pultegroup
PHM
$24.1B
| $14.1M | 0.01% |
137,000
-15,000
| -10% | -$1.62M |
|
686
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$22B
| $14.1M | 0.01% |
882,724
-117,614
| -12% | -$2.97M |
|
687
PUT
Tapestry
TPR
$29B
| $14M | 0.01% |
199,200
-88,600
| -31% | -$6.71M |
|
688
CALL
Petrobras
PBR
$122B
| $14M | 0.01% |
1,007,400
+158,100
| +19% | +$2.18M |
|
689
CALL
Toronto Dominion Bank
TD
$200B
| $14M | 0.01% |
233,500
-39,200
| -14% | -$2.28M |
|
690
CALL
Darden Restaurants
DRI
$22.2B
| $14M | 0.01% |
67,300
+9,000
| +15% | +$1.74M |
|
691
CALL
CSX Corp
CSX
$92.8B
| $14M | 0.01% |
474,700
+194,400
| +69% | +$6.17M |
|
692
PUT
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$135M
| $13.9M | 0.01% |
430,100
+34,000
| +9% | +$718K |
|
693
CALL
Etsy
ETSY
$7.64B
| $13.9M | 0.01% |
294,000
-211,600
| -42% | -$10.8M |
|
694
CALL
Caesars Entertainment
CZR
$6.1B
| $13.9M | 0.01% |
554,700
-110,200
| -17% | -$3.58M |
|
695
CALL
Fair Isaac
FICO
$28.3B
| $13.8M | 0.01% |
7,500
+2,500
| +50% | +$4.63M |
|
696
CALL
AGNC Investment
AGNC
$12.5B
| $13.8M | 0.01% |
1,443,500
+100
| +0% | +$999 |
|
697
PUT
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$4.1B
| $13.8M | 0.01% |
301,400
+277,900
| +1,183% | +$14.5M |
|
698
Microsoft
MSFT
$2.9T
| $13.8M | 0.01% |
36,777
+34,181
| +1,317% | +$13.9M |
|
699
CALL
Digital Realty Trust
DLR
$66B
| $13.8M | 0.01% |
96,100
+12,700
| +15% | +$2.07M |
|
700
CALL
Cardinal Health
CAH
$51.7B
| $13.7M | 0.01% |
99,300
+9,100
| +10% | +$1.16M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.