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 | |
|---|---|---|---|---|---|---|
3776
CALL
Kimco Realty
KIM
$17.7B
| $348K | ﹤0.01% |
16,400
+7,400
| +82% | +$162K |
|
3777
Ouster
OUST
$2.28B
| $348K | ﹤0.01% |
38,796
+19,201
| +98% | +$189K |
|
3778
GraniteShares ETF Trust GraniteShares 2x Long BABA Daily ETF
BABX
$98M
| $347K | ﹤0.01% |
9,748
+9,563
| +5,169% | +$280K |
|
|
SGMO
3779
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $345K | ﹤0.01% |
526,300
-71,800
| -12% | -$76K |
|
|
WIMI
3780
CALL
WiMi Hologram Cloud
WIMI
$21M
| $345K | ﹤0.01% |
35,480
+25,220
| +246% | +$241K |
|
3781
CALL
Invesco DB Base Metals Fund
DBB
$305M
| $344K | ﹤0.01% |
13,900
-25,000
| -64% | -$482K |
|
3782
Opendoor
OPEN
$3.8B
| $344K | ﹤0.01% |
348,959
+56,342
| +19% | +$74K |
|
3783
CALL
Vitesse Energy
VTS
$626M
| $344K | ﹤0.01% |
14,000
+10,900
| +352% | +$279K |
|
3784
Popular Inc
BPOP
$11.1B
| $343K | ﹤0.01% |
3,716
+3,662
| +6,781% | +$356K |
|
3785
PUT
NewAmsterdam Pharma
NAMS
$3.27B
| $343K | ﹤0.01% |
16,800
-17,900
| -52% | -$398K |
|
3786
CALL
Steven Madden
SHOO
$3.22B
| $343K | ﹤0.01% |
+12,900
| New | +$454K |
|
3787
CALL
TD Synnex
SNX
$19.8B
| $343K | ﹤0.01% |
3,300
+2,300
| +230% | +$307K |
|
|
3788
PUT
TD Synnex
SNX
$19.8B
| $343K | ﹤0.01% |
3,300
+1,900
| +136% | +$254K |
|
3789
SS&C Technologies
SSNC
$18.8B
| $343K | ﹤0.01% |
+4,108
| New | +$340K |
|
3790
TransDigm Group
TDG
$73.2B
| $343K | ﹤0.01% |
+248
| New | +$331K |
|
3791
CALL
Adeia
ADEA
$2.77B
| $342K | ﹤0.01% |
25,900
+6,400
| +33% | +$89.1K |
|
|
RC
3792
CALL
Ready Capital
RC
$261M
| $342K | ﹤0.01% |
67,300
-7,700
| -10% | -$47.5K |
|
3793
Titan Machinery
TITN
$458M
| $342K | ﹤0.01% |
+20,112
| New | +$332K |
|
3794
BioMarin Pharmaceuticals
BMRN
$12B
| $341K | ﹤0.01% |
4,834
-43,409
| -90% | -$2.92M |
|
3795
PUT
Fiverr
FVRR
$417M
| $340K | ﹤0.01% |
14,400
-75,800
| -84% | -$2.2M |
|
3796
CALL
H&R Block
HRB
$5.7B
| $340K | ﹤0.01% |
6,200
-12,400
| -67% | -$663K |
|
3797
Global X Lithium & Battery Tech ETF
LIT
$1.46B
| $340K | ﹤0.01% |
8,772
-6,380
| -42% | -$262K |
|
3798
PUT
Neogen
NEOG
$2B
| $340K | ﹤0.01% |
39,300
+35,600
| +962% | +$373K |
|
3799
Sonos
SONO
$2B
| $340K | ﹤0.01% |
31,903
+10,440
| +49% | +$137K |
|
|
TGNA
3800
CALL
DELISTED
TEGNA Inc
TGNA
| $340K | ﹤0.01% |
18,700
-13,900
| -43% | -$251K |
|
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.