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 | |
|---|---|---|---|---|---|---|
5851
Edgewise Therapeutics
EWTX
$4.42B
| $54K | ﹤0.01% |
+4,183
| New | +$60.3K |
|
|
HUYA
5852
PUT
Huya Inc
HUYA
$570M
| $54K | ﹤0.01% |
15,500
-1,156,900
| -99% | -$4.19M |
|
5853
Grupo Aeroportuario Centro Norte
OMAB
$5.22B
| $54K | ﹤0.01% |
514
-24
| -4% | -$2.25K |
|
|
TEF
5854
DELISTED
Telefonica
TEF
| $54K | ﹤0.01% |
10,446
-34,401
| -77% | -$173K |
|
|
TERN
5855
DELISTED
Terns Pharmaceuticals
TERN
| $54K | ﹤0.01% |
+14,650
| New | +$45.8K |
|
|
TUYA
5856
CALL
Tuya Inc
TUYA
$1.04B
| $54K | ﹤0.01% |
23,700
+4,300
| +22% | +$10.4K |
|
5857
PUT
Titan International
TWI
$474M
| $54K | ﹤0.01% |
5,300
-5,000
| -49% | -$38.6K |
|
5858
PUT
U-Haul Holding Co Series N
UHAL.B
$12.3B
| $54K | ﹤0.01% |
1,000
-200
| -17% | -$11.2K |
|
|
SW
5859
Smurfit Westrock
SW
$24.9B
| $54K | ﹤0.01% |
1,263
-1,712
| -58% | -$73.2K |
|
5860
PUT
Artisan Partners
APAM
$2.82B
| $53K | ﹤0.01% |
1,200
| – | – |
|
5861
CALL
Atlas Lithium Corp
ATLX
$80.2M
| $53K | ﹤0.01% |
14,200
+11,900
| +517% | +$49.6K |
|
5862
PUT
Avista
AVA
$3.39B
| $53K | ﹤0.01% |
+1,400
| New | +$55.2K |
|
5863
Blackbaud
BLKB
$1.84B
| $53K | ﹤0.01% |
835
+621
| +290% | +$38.8K |
|
5864
CALL
Clean Energy Fuels
CLNE
$425M
| $53K | ﹤0.01% |
27,500
+15,900
| +137% | +$27K |
|
5865
Douglas Elliman
DOUG
$155M
| $53K | ﹤0.01% |
23,131
-1,071
| -4% | -$2.29K |
|
5866
CALL
Frontdoor
FTDR
$5.16B
| $53K | ﹤0.01% |
900
-4,100
| -82% | -$206K |
|
5867
Direxion Daily S&P 500 High Beta Bull 3X ETF
HIBL
$75.1M
| $53K | ﹤0.01% |
+1,242
| New | +$36.8K |
|
|
NA
5868
PUT
Nano Labs
NA
$42.5M
| $53K | ﹤0.01% |
+5,800
| New | +$35.3K |
|
|
NAK
5869
Northern Dynasty Minerals
NAK
$779M
| $53K | ﹤0.01% |
39,747
-190,132
| -83% | -$212K |
|
5870
Service Corp International
SCI
$11.8B
| $53K | ﹤0.01% |
+655
| New | +$51.1K |
|
5871
Sagimet Biosciences
SGMT
$451M
| $53K | ﹤0.01% |
+6,965
| New | +$29.4K |
|
5872
STAG Industrial
STAG
$7.43B
| $53K | ﹤0.01% |
+1,462
| New | +$50.6K |
|
5873
Standex International
SXI
$3.48B
| $53K | ﹤0.01% |
+339
| New | +$50.8K |
|
|
TRUE
5874
DELISTED
TrueCar
TRUE
| $53K | ﹤0.01% |
28,273
-10,307
| -27% | -$15.7K |
|
5875
2x Long VIX Futures ETF
UVIX
$262M
| $53K | ﹤0.01% |
+120
| New | +$92.1K |
|
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.