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 | |
|---|---|---|---|---|---|---|
5501
PUT
Revolve Group
RVLV
$1.81B
| $76K | ﹤0.01% |
3,800
-9,600
| -72% | -$194K |
|
5502
Steris
STE
$22.4B
| $76K | ﹤0.01% |
+320
| New | +$74.5K |
|
5503
Transcat
TRNS
$805M
| $76K | ﹤0.01% |
+890
| New | +$72.7K |
|
5504
PUT
Atlas Lithium Corp
ATLX
$79.6M
| $75K | ﹤0.01% |
20,000
-16,200
| -45% | -$67.5K |
|
5505
PUT
AvePoint
AVPT
$2.75B
| $75K | ﹤0.01% |
3,900
-2,600
| -40% | -$45.1K |
|
|
CLBR
5506
PUT
DELISTED
Colombier Acquisition Corp II
CLBR
| $75K | ﹤0.01% |
+46,100
| New | +$604K |
|
5507
Enerpac Tool Group
EPAC
$1.83B
| $75K | ﹤0.01% |
+1,850
| New | +$77.9K |
|
5508
PUT
Evergy
EVRG
$19.2B
| $75K | ﹤0.01% |
1,100
-5,000
| -82% | -$336K |
|
5509
PUT
IHS Holding
IHS
$2.76B
| $75K | ﹤0.01% |
13,500
+2,800
| +26% | +$15.1K |
|
|
ILPT
5510
Industrial Logistics Properties Trust
ILPT
$564M
| $75K | ﹤0.01% |
+16,588
| New | +$54.9K |
|
5511
PUT
Neurocrine Biosciences
NBIX
$16.8B
| $75K | ﹤0.01% |
600
+200
| +50% | +$22.9K |
|
5512
Pricesmart
PSMT
$6.05B
| $75K | ﹤0.01% |
+719
| New | +$72.5K |
|
5513
Global X SuperDividend ETF
SDIV
$1.22B
| $75K | ﹤0.01% |
+3,350
| New | +$70.4K |
|
5514
TD Synnex
SNX
$20.4B
| $75K | ﹤0.01% |
557
-1,894
| -77% | -$222K |
|
5515
PUT
Teradata
TDC
$2.91B
| $75K | ﹤0.01% |
3,400
-34,500
| -91% | -$750K |
|
5516
Roundhill Bitcoin Covered Call Strategy ETF
YBTC
$126M
| $75K | ﹤0.01% |
+1,620
| New | +$71.3K |
|
|
RZLV
5517
PUT
Rezolve AI
RZLV
$973M
| $75K | ﹤0.01% |
24,500
+23,400
| +2,127% | +$46.1K |
|
5518
CALL
Carlisle Companies
CSL
$14.4B
| $74K | ﹤0.01% |
200
-600
| -75% | -$223K |
|
5519
CALL
China Yuchai International
CYD
$1.79B
| $74K | ﹤0.01% |
3,100
-1,500
| -33% | -$26.3K |
|
|
EFXT
5520
CALL
Enerflex
EFXT
$2.73B
| $74K | ﹤0.01% |
9,400
-2,300
| -20% | -$16.5K |
|
|
ELME
5521
Elme Communities
ELME
$144M
| $74K | ﹤0.01% |
+4,666
| New | +$74.1K |
|
5522
Ero Copper
ERO
$2.79B
| $74K | ﹤0.01% |
4,404
-11,589
| -72% | -$157K |
|
5523
CALL
Mid-America Apartment Communities
MAA
$15.5B
| $74K | ﹤0.01% |
500
-3,000
| -86% | -$468K |
|
5524
CALL
PSQ Holdings
PSQH
$13.7M
| $74K | ﹤0.01% |
2,413
-5,154
| -68% | -$158K |
|
5525
The RMR Group
RMR
$326M
| $74K | ﹤0.01% |
4,582
+2,307
| +101% | +$35.3K |
|
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.