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 | Miscellaneous | 98.56% |
| 2 | Technology | 0.41% |
| 3 | Consumer Discretionary | 0.22% |
| 4 | Healthcare | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
926
CALL
Yum China
YUMC
$14.8B
| $9.53M | 0.01% |
183,100
-172,100
| -48% | -$8.26M |
|
927
CALL
VanEck Durable High Dividend ETF
DURA
$38.6M
| $9.49M | 0.01% |
98,400
+59,000
| +150% | +$1.97M |
|
928
CALL
Corcept Therapeutics
CORT
$12.1B
| $9.49M | 0.01% |
83,100
+42,200
| +103% | +$2.57M |
|
929
CALL
Plains All American Pipeline
PAA
$18.1B
| $9.47M | 0.01% |
473,500
-78,400
| -14% | -$1.55M |
|
930
PUT
CAVA Group
CAVA
$7.1B
| $9.43M | 0.01% |
109,100
-291,400
| -73% | -$31.6M |
|
|
NBIS
931
PUT
Nebius Group N.V.
NBIS
$61.5B
| $9.41M | 0.01% |
445,900
+69,500
| +18% | +$2.29M |
|
932
CALL
Dominion Energy
D
$57.9B
| $9.41M | 0.01% |
167,800
-318,300
| -65% | -$17.5M |
|
933
CALL
Stellantis
STLA
$16.1B
| $9.4M | 0.01% |
839,000
+114,100
| +16% | +$1.47M |
|
|
METD
934
CALL
Direxion Daily META Bear 1X ETF
METD
$8.53M
| $9.39M | 0.01% |
233,700
-189,700
| -45% | -$3.42M |
|
935
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$738M
| $9.39M | 0.01% |
172,600
+74,200
| +75% | +$3.21M |
|
936
PUT
General Dynamics
GD
$97.2B
| $9.35M | 0.01% |
34,300
-8,900
| -21% | -$2.31M |
|
937
iShares Gold Trust
IAU
$65.8B
| $9.34M | 0.01% |
158,432
+91,102
| +135% | +$4.93M |
|
938
PUT
GSK
GSK
$100B
| $9.29M | 0.01% |
239,800
+87,700
| +58% | +$3.21M |
|
939
PUT
Tyson Foods
TSN
$18.1B
| $9.27M | 0.01% |
145,200
-227,800
| -61% | -$13.4M |
|
940
CALL
Alaska Air
ALK
$4.69B
| $9.2M | 0.01% |
186,900
-15,400
| -8% | -$1.01M |
|
941
CALL
FTAI Aviation
FTAI
$20.2B
| $9.19M | 0.01% |
82,800
-12,900
| -13% | -$1.52M |
|
942
PUT
Lumen
LUMN
$6.98B
| $9.17M | 0.01% |
2,340,400
-891,000
| -28% | -$4.44M |
|
943
PUT
Dutch Bros
BROS
$6.43B
| $9.14M | 0.01% |
148,100
+29,100
| +24% | +$1.92M |
|
944
CALL
Honda
HMC
$42.4B
| $9.1M | 0.01% |
335,400
+156,500
| +87% | +$4.46M |
|
945
Rio Tinto
RIO
$168B
| $9.08M | 0.01% |
+151,186
| New | +$9.31M |
|
946
CALL
Johnson Controls International
JCI
$87.8B
| $9.05M | 0.01% |
113,000
+21,100
| +23% | +$1.73M |
|
947
CALL
Veeva Systems
VEEV
$44.5B
| $8.96M | 0.01% |
38,700
-23,800
| -38% | -$5.44M |
|
948
CALL
Prudential Financial
PRU
$42.1B
| $8.96M | 0.01% |
80,200
-19,200
| -19% | -$2.19M |
|
949
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.5B
| $8.8M | 0.01% |
16,500
+9,200
| +126% | +$5.22M |
|
950
CALL
Groupon
GRPN
$767M
| $8.8M | 0.01% |
468,900
+18,400
| +4% | +$233K |
|
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's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.