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 | |
|---|---|---|---|---|---|---|
851
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$152B
| $10.7M | 0.01% |
180,500
-224,700
| -55% | -$12.1M |
|
852
CALL
Diamondback Energy
FANG
$57.7B
| $10.7M | 0.01% |
66,900
-33,300
| -33% | -$5.37M |
|
853
PUT
Amphenol
APH
$194B
| $10.7M | 0.01% |
162,400
+48,800
| +43% | +$3.33M |
|
854
PUT
Ally Financial
ALLY
$13.3B
| $10.6M | 0.01% |
291,800
-136,400
| -32% | -$5.02M |
|
855
CALL
American Electric Power
AEP
$72.8B
| $10.6M | 0.01% |
97,200
-47,500
| -33% | -$4.81M |
|
856
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $10.6M | 0.01% |
146,700
-58,500
| -29% | -$1.6M |
|
857
CALL
BridgeBio Pharma
BBIO
$16.2B
| $10.6M | 0.01% |
306,300
-71,500
| -19% | -$2.41M |
|
858
CALL
PENN Entertainment
PENN
$2.73B
| $10.6M | 0.01% |
648,800
-261,800
| -29% | -$5.12M |
|
859
PUT
Kroger
KR
$33.9B
| $10.6M | 0.01% |
156,300
-23,900
| -13% | -$1.51M |
|
860
CALL
Colgate-Palmolive
CL
$71.7B
| $10.6M | 0.01% |
112,900
-152,300
| -57% | -$13.6M |
|
861
PUT
Vertex Pharmaceuticals
VRTX
$121B
| $10.6M | 0.01% |
21,800
-30,400
| -58% | -$14.2M |
|
862
PUT
Tenet Healthcare
THC
$16.6B
| $10.5M | 0.01% |
78,400
-28,700
| -27% | -$3.78M |
|
863
CALL
Sable Offshore Corp
SOC
$872M
| $10.5M | 0.01% |
413,800
+171,200
| +71% | +$4.38M |
|
864
State Street Technology Select Sector SPDR ETF
XLK
$117B
| $10.5M | 0.01% |
+101,426
| New | +$11.5M |
|
865
PUT
Riot Platforms
RIOT
$9.2B
| $10.5M | 0.01% |
1,470,000
-223,900
| -13% | -$2.32M |
|
866
Edison International
EIX
$30.7B
| $10.4M | 0.01% |
176,880
+176,769
| +159,251% | +$10.2M |
|
867
CALL
CarMax
KMX
$8.17B
| $10.4M | 0.01% |
133,500
+16,200
| +14% | +$1.3M |
|
|
TEM
868
PUT
Tempus AI
TEM
$8.32B
| $10.4M | 0.01% |
215,000
+150,000
| +231% | +$8.1M |
|
869
CALL
PPG Industries
PPG
$25.3B
| $10.4M | 0.01% |
94,800
-52,000
| -35% | -$6M |
|
870
CALL
DexCom
DXCM
$27.2B
| $10.3M | 0.01% |
151,500
-242,600
| -62% | -$19.8M |
|
871
PUT
Rigetti Computing
RGTI
$5B
| $10.3M | 0.01% |
1,304,600
+230,400
| +21% | +$2.55M |
|
872
CALL
Bunge Global
BG
$23.8B
| $10.3M | 0.01% |
134,800
+73,800
| +121% | +$5.52M |
|
873
CALL
AngloGold Ashanti
AU
$39.8B
| $10.3M | 0.01% |
277,400
+114,400
| +70% | +$3.51M |
|
874
United Parcel Service
UPS
$97.3B
| $10.3M | 0.01% |
+93,523
| New | +$11.2M |
|
875
PUT
Welltower
WELL
$174B
| $10.3M | 0.01% |
67,100
+17,000
| +34% | +$2.42M |
|
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.