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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
CIVI
1851
DELISTED
Civitas Resources
CIVI
| $2.69M | ﹤0.01% |
97,895
+79,347
| +428% | +$2.3M |
|
|
FLG
1852
Flagstar Bank National Association
FLG
$5.77B
| $2.69M | ﹤0.01% |
254,125
+92,238
| +57% | +$1.05M |
|
1853
PUT
Aurora
AUR
$11.7B
| $2.69M | ﹤0.01% |
513,700
+321,800
| +168% | +$2.02M |
|
1854
PUT
UroGen Pharma
URGN
$2B
| $2.69M | ﹤0.01% |
196,400
+193,800
| +7,454% | +$1.86M |
|
1855
PUT
Vipshop
VIPS
$6.84B
| $2.69M | ﹤0.01% |
178,500
+116,000
| +186% | +$1.64M |
|
1856
PUT
RXO
RXO
$4.23B
| $2.68M | ﹤0.01% |
170,600
+165,500
| +3,245% | +$2.51M |
|
|
AL
1857
PUT
DELISTED
Air Lease Corp
AL
| $2.68M | ﹤0.01% |
45,800
+33,600
| +275% | +$1.75M |
|
1858
CALL
SBA Communications
SBAC
$18.4B
| $2.68M | ﹤0.01% |
11,400
-800
| -7% | -$183K |
|
|
VSXY
1859
CALL
Victoria's Secret
VSXY
$6.64B
| $2.68M | ﹤0.01% |
144,500
-39,500
| -21% | -$772K |
|
|
BTFX
1860
CALL
DELISTED
Valkyrie ETF Trust II CoinShares Bitcoin Leverage ETF
BTFX
| $2.67M | ﹤0.01% |
118,100
+73,100
| +162% | +$3.39M |
|
1861
PUT
Host Hotels & Resorts
HST
$16.8B
| $2.67M | ﹤0.01% |
174,100
-23,600
| -12% | -$350K |
|
1862
PUT
Vital Farms
VITL
$558M
| $2.67M | ﹤0.01% |
69,400
+1,500
| +2% | +$50.6K |
|
1863
CALL
Box
BOX
$4.02B
| $2.67M | ﹤0.01% |
78,200
-1,000
| -1% | -$32.8K |
|
1864
Vanguard FTSE Europe ETF
VGK
$30B
| $2.67M | ﹤0.01% |
34,405
+24,903
| +262% | +$1.84M |
|
1865
PUT
Group 1 Automotive
GPI
$3.94B
| $2.66M | ﹤0.01% |
6,100
-600
| -9% | -$252K |
|
|
KOCG
1866
PUT
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $2.66M | ﹤0.01% |
52,100
+35,200
| +208% | +$1.02M |
|
1867
Tenet Healthcare
THC
$20.1B
| $2.66M | ﹤0.01% |
15,110
+11,346
| +301% | +$1.71M |
|
|
GRRR
1868
CALL
Gorilla Technology Group
GRRR
$333M
| $2.65M | ﹤0.01% |
133,400
+39,600
| +42% | +$740K |
|
1869
PUT
Tencent Music
TME
$14.5B
| $2.65M | ﹤0.01% |
136,000
-113,900
| -46% | -$1.79M |
|
|
PPLC
1870
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $2.65M | ﹤0.01% |
129,300
+81,300
| +169% | +$1.66M |
|
1871
PUT
argenx
ARGX
$57.4B
| $2.65M | ﹤0.01% |
4,800
+3,800
| +380% | +$2.21M |
|
1872
CALL
Centene
CNC
$31.3B
| $2.64M | ﹤0.01% |
48,700
-113,600
| -70% | -$6.66M |
|
1873
CALL
Eastman Chemical
EMN
$7.8B
| $2.63M | ﹤0.01% |
35,300
+16,400
| +87% | +$1.29M |
|
1874
CALL
Infosys
INFY
$45B
| $2.63M | ﹤0.01% |
142,200
+36,700
| +35% | +$655K |
|
|
ABK
1875
CALL
DELISTED
Ambac Financial Group
ABK
| $2.63M | ﹤0.01% |
370,700
+49,900
| +16% | +$354K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.