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 | |
|---|---|---|---|---|---|---|
|
ONT
3976
Onterris Inc
ONT
$722M
| $280K | ﹤0.01% |
19,703
+16,089
| +445% | +$306K |
|
3977
PUT
RB Global
RBA
$21.5B
| $280K | ﹤0.01% |
2,800
-8,200
| -75% | -$782K |
|
|
DFTX
3978
Definium Therapeutics
DFTX
$5.53B
| $279K | ﹤0.01% |
47,856
+37,628
| +368% | +$270K |
|
3979
CALL
Vulcan Materials
VMC
$37.7B
| $279K | ﹤0.01% |
1,200
-1,400
| -54% | -$356K |
|
|
ZK
3980
CALL
DELISTED
Zeekr
ZK
| $279K | ﹤0.01% |
11,600
+600
| +5% | +$16K |
|
|
EVRI
3981
PUT
DELISTED
Everi Holdings
EVRI
| $278K | ﹤0.01% |
20,400
-100
| -0.5% | -$1.36K |
|
3982
CALL
Kosmos Energy
KOS
$1.44B
| $278K | ﹤0.01% |
122,200
+14,100
| +13% | +$41.6K |
|
3983
PUT
Privia Health
PRVA
$3.07B
| $278K | ﹤0.01% |
12,400
+10,400
| +520% | +$242K |
|
3984
CALL
Personalis
PSNL
$1.25B
| $278K | ﹤0.01% |
79,400
+11,200
| +16% | +$53.2K |
|
|
HTT
3985
CALL
High Templar Tech Ltd
HTT
$374M
| $278K | ﹤0.01% |
103,400
+95,500
| +1,209% | +$270K |
|
3986
PUT
Rayonier
RYN
$6.62B
| $278K | ﹤0.01% |
10,488
+8,390
| +400% | +$213K |
|
3987
Performance Food Group
PFGC
$18.2B
| $277K | ﹤0.01% |
+3,535
| New | +$295K |
|
|
SKE
3988
PUT
Skeena Resources
SKE
$3.19B
| $277K | ﹤0.01% |
27,500
+15,400
| +127% | +$155K |
|
3989
CALL
AtaiBeckley Inc
ATAI
$2.66B
| $276K | ﹤0.01% |
203,300
+112,400
| +124% | +$189K |
|
|
JFIN
3990
PUT
Jiayin Group
JFIN
$114M
| $276K | ﹤0.01% |
20,100
+2,000
| +11% | +$18.8K |
|
3991
PUT
NerdWallet
NRDS
$629M
| $276K | ﹤0.01% |
30,500
+14,300
| +88% | +$171K |
|
3992
PUT
PAR Technology
PAR
$714M
| $276K | ﹤0.01% |
4,500
-1,400
| -24% | -$93.9K |
|
3993
CALL
Sabra Healthcare REIT
SBRA
$5.63B
| $276K | ﹤0.01% |
15,800
-1,800
| -10% | -$30.3K |
|
3994
CALL
Verastem
VSTM
$530M
| $276K | ﹤0.01% |
45,900
+39,300
| +595% | +$240K |
|
|
LINE
3995
Lineage Inc
LINE
$9.93B
| $276K | ﹤0.01% |
+4,716
| New | +$275K |
|
3996
PUT
Energizer
ENR
$1.46B
| $275K | ﹤0.01% |
9,200
+7,600
| +475% | +$243K |
|
3997
PUT
TechnipFMC
FTI
$29.1B
| $275K | ﹤0.01% |
8,700
+900
| +12% | +$27K |
|
|
NGD
3998
PUT
DELISTED
New Gold Inc
NGD
| $275K | ﹤0.01% |
74,300
-14,400
| -16% | -$42.7K |
|
3999
PUT
Phathom Pharmaceuticals
PHAT
$934M
| $275K | ﹤0.01% |
43,900
+39,000
| +796% | +$237K |
|
|
BLD
4000
PUT
DELISTED
TopBuild
BLD
| $274K | ﹤0.01% |
900
+600
| +200% | +$192K |
|
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.