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 | |
|---|---|---|---|---|---|---|
3251
PUT
Nasdaq
NDAQ
$52.5B
| $634K | ﹤0.01% |
7,100
-18,800
| -73% | -$1.5M |
|
|
WCN
3252
PUT
Waste Connections
WCN
$42.7B
| $634K | ﹤0.01% |
3,400
-20,100
| -86% | -$3.87M |
|
|
MAG
3253
PUT
DELISTED
MAG Silver
MAG
| $633K | ﹤0.01% |
30,000
+21,600
| +257% | +$384K |
|
|
ONIT
3254
Onity Group
ONIT
$336M
| $633K | ﹤0.01% |
16,599
+3,757
| +29% | +$133K |
|
|
CLBR
3255
DELISTED
Colombier Acquisition Corp II
CLBR
| $632K | ﹤0.01% |
40,937
+40,593
| +11,800% | +$532K |
|
3256
Qorvo
QRVO
$7.92B
| $632K | ﹤0.01% |
+7,453
| New | +$538K |
|
3257
Semtech
SMTC
$11.3B
| $632K | ﹤0.01% |
14,003
-18,541
| -57% | -$660K |
|
3258
CALL
Agios Pharmaceuticals
AGIO
$2.2B
| $631K | ﹤0.01% |
19,000
-800
| -4% | -$24.2K |
|
3259
CALL
Ero Copper
ERO
$2.73B
| $631K | ﹤0.01% |
37,500
-30,400
| -45% | -$411K |
|
3260
CALL
Extreme Networks
EXTR
$3.92B
| $631K | ﹤0.01% |
35,200
+24,800
| +238% | +$365K |
|
3261
CALL
CBRE Group
CBRE
$42.1B
| $630K | ﹤0.01% |
4,500
-139,300
| -97% | -$17.6M |
|
3262
CALL
Lennox International
LII
$19B
| $630K | ﹤0.01% |
1,100
-2,700
| -71% | -$1.51M |
|
3263
TAL Education Group
TAL
$5.86B
| $630K | ﹤0.01% |
61,653
+46,206
| +299% | +$477K |
|
3264
PUT
Brunswick
BC
$5.24B
| $629K | ﹤0.01% |
11,400
-1,100
| -9% | -$55.6K |
|
3265
CALL
Harrow
HROW
$1.4B
| $629K | ﹤0.01% |
20,600
-2,800
| -12% | -$75.2K |
|
3266
CALL
Kinsale Capital Group
KNSL
$8.24B
| $629K | ﹤0.01% |
1,300
+200
| +18% | +$93.3K |
|
3267
argenx
ARGX
$55.6B
| $627K | ﹤0.01% |
+1,138
| New | +$660K |
|
3268
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$269M
| $627K | ﹤0.01% |
8,400
+3,900
| +87% | +$231K |
|
3269
PUT
Trevi Therapeutics
TRVI
$2.57B
| $626K | ﹤0.01% |
114,600
+90,500
| +376% | +$563K |
|
3270
PUT
Arqit Quantum
ARQQ
$316M
| $625K | ﹤0.01% |
16,900
+8,200
| +94% | +$176K |
|
|
HAPN
3271
PUT
Happen Inc
HAPN
$2.16B
| $624K | ﹤0.01% |
51,900
+17,900
| +53% | +$186K |
|
3272
PUT
Boot Barn
BOOT
$4.71B
| $623K | ﹤0.01% |
4,100
-8,900
| -68% | -$1.18M |
|
3273
PUT
BlackLine
BL
$1.8B
| $622K | ﹤0.01% |
11,000
-2,600
| -19% | -$134K |
|
3274
PUT
Kimco Realty
KIM
$17.8B
| $622K | ﹤0.01% |
29,600
+27,500
| +1,310% | +$570K |
|
3275
Direxion Daily AAPL Bull 2X ETF
AAPU
$193M
| $621K | ﹤0.01% |
+28,324
| New | +$619K |
|
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.