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 | |
|---|---|---|---|---|---|---|
3476
CALL
Bausch + Lomb
BLCO
$5.81B
| $459K | ﹤0.01% |
31,700
-8,100
| -20% | -$133K |
|
3477
Compass
COMP
$8.73B
| $459K | ﹤0.01% |
52,590
-46,203
| -47% | -$366K |
|
3478
Sundial Growers
SNDL
$325M
| $459K | ﹤0.01% |
325,975
-110,938
| -25% | -$188K |
|
3479
iQIYI
IQ
$1.21B
| $458K | ﹤0.01% |
+202,804
| New | +$446K |
|
3480
CALL
Protara Therapeutics
TARA
$221M
| $458K | ﹤0.01% |
107,700
+103,500
| +2,464% | +$462K |
|
3481
Aaon
AAON
$7.81B
| $457K | ﹤0.01% |
5,856
+5,110
| +685% | +$527K |
|
3482
PUT
Axcelis
ACLS
$3.52B
| $456K | ﹤0.01% |
9,200
+4,600
| +100% | +$291K |
|
3483
Direxion Daily Regional Banks Bull 3X ETF
DPST
$471M
| $456K | ﹤0.01% |
+5,271
| New | +$575K |
|
3484
PUT
TETRA Technologies
TTI
$1.07B
| $456K | ﹤0.01% |
135,800
+96,300
| +244% | +$384K |
|
3485
CALL
Upwork
UPWK
$1.19B
| $455K | ﹤0.01% |
34,900
-50,600
| -59% | -$771K |
|
3486
PUT
WEX
WEX
$6.2B
| $455K | ﹤0.01% |
+2,900
| New | +$478K |
|
3487
Mirion Technologies
MIR
$4.07B
| $454K | ﹤0.01% |
+31,370
| New | +$493K |
|
3488
Petco
WOOF
$791M
| $454K | ﹤0.01% |
149,033
+127,175
| +582% | +$398K |
|
|
BIOA
3489
PUT
BioAge Labs
BIOA
$929M
| $454K | ﹤0.01% |
+120,900
| New | +$559K |
|
|
BASE
3490
DELISTED
Couchbase
BASE
| $453K | ﹤0.01% |
+28,789
| New | +$477K |
|
3491
CALL
Xylem
XYL
$29.8B
| $453K | ﹤0.01% |
3,800
-10,900
| -74% | -$1.35M |
|
3492
PUT
ARK 21Shares Bitcoin ETF
ARKB
$2.41B
| $452K | ﹤0.01% |
16,500
+10,500
| +175% | +$325K |
|
3493
CALL
BioCryst Pharmaceuticals
BCRX
$2.42B
| $452K | ﹤0.01% |
60,300
-28,900
| -32% | -$233K |
|
3494
CALL
SelectQuote
SLQT
$130M
| $452K | ﹤0.01% |
135,600
-24,000
| -15% | -$102K |
|
3495
Nexstar Media Group
NXST
$5.89B
| $451K | ﹤0.01% |
+2,522
| New | +$408K |
|
3496
PUT
GeneDx Holdings
WGS
$1.79B
| $451K | ﹤0.01% |
5,100
+4,700
| +1,175% | +$408K |
|
|
MASI
3497
CALL
DELISTED
Masimo
MASI
| $449K | ﹤0.01% |
2,700
+1,800
| +200% | +$312K |
|
3498
CALL
Similarweb
SMWB
$626M
| $449K | ﹤0.01% |
54,400
-7,300
| -12% | -$90K |
|
|
DCH
3499
CALL
Dauch Corp
DCH
$1.31B
| $448K | ﹤0.01% |
110,100
+58,900
| +115% | +$302K |
|
3500
CALL
Hilton Grand Vacations
HGV
$4.02B
| $448K | ﹤0.01% |
+12,000
| New | +$478K |
|
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.