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 | |
|---|---|---|---|---|---|---|
5651
CALL
Wave Life Sciences
WVE
$1.13B
| $66K | ﹤0.01% |
10,200
-72,900
| -88% | -$481K |
|
5652
PUT
Xeris Biopharma Holdings
XERS
$1.45B
| $66K | ﹤0.01% |
14,200
+7,600
| +115% | +$34.8K |
|
|
YALA
5653
CALL
Yalla Group
YALA
$817M
| $66K | ﹤0.01% |
+9,800
| New | +$66.5K |
|
5654
Corpay
CPAY
$25.5B
| $66K | ﹤0.01% |
+201
| New | +$65.6K |
|
|
ZENA
5655
ZenaTech Inc
ZENA
$116M
| $66K | ﹤0.01% |
18,071
+17,795
| +6,447% | +$51.3K |
|
5656
PUT
CytomX Therapeutics
CTMX
$714M
| $65K | ﹤0.01% |
+28,800
| New | +$46.4K |
|
5657
Glaukos
GKOS
$9.94B
| $65K | ﹤0.01% |
+633
| New | +$59.4K |
|
5658
PUT
The Honest Company
HNST
$409M
| $65K | ﹤0.01% |
12,900
+1,700
| +15% | +$8.15K |
|
5659
CALL
JELD-WEN Holding
JELD
$117M
| $65K | ﹤0.01% |
16,800
-5,600
| -25% | -$25K |
|
5660
PUT
Playboy Inc
PLBY
$133M
| $65K | ﹤0.01% |
40,600
-22,900
| -36% | -$29.4K |
|
5661
PUT
RPM International
RPM
$13.8B
| $65K | ﹤0.01% |
600
+400
| +200% | +$44K |
|
5662
Sally Beauty Holdings
SBH
$1.46B
| $65K | ﹤0.01% |
7,123
-2,374
| -25% | -$20.5K |
|
5663
PUT
SurgePays
SURG
$5.43M
| $65K | ﹤0.01% |
21,200
+17,700
| +506% | +$49K |
|
5664
iShares TIPS Bond ETF
TIP
$14.5B
| $65K | ﹤0.01% |
+591
| New | +$64.5K |
|
5665
PUT
Zevia
ZVIA
$116M
| $65K | ﹤0.01% |
20,300
-13,500
| -40% | -$35.5K |
|
5666
Ibotta
IBTA
$614M
| $65K | ﹤0.01% |
+1,795
| New | +$83.8K |
|
5667
PUT
Banner Corp
BANR
$2.37B
| $64K | ﹤0.01% |
+1,000
| New | +$61.8K |
|
|
BLRX
5668
BioLineRX
BLRX
$11.7M
| $64K | ﹤0.01% |
+14,114
| New | +$52.2K |
|
5669
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$15B
| $64K | ﹤0.01% |
+692
| New | +$62.3K |
|
5670
CALL
Gildan
GIL
$9.72B
| $64K | ﹤0.01% |
1,300
-100
| -7% | -$4.59K |
|
5671
PUT
Immatics
IMTX
$1.26B
| $64K | ﹤0.01% |
11,900
-6,500
| -35% | -$32.2K |
|
5672
iShares Dow Jones US ETF
IYY
$2.93B
| $64K | ﹤0.01% |
+426
| New | +$59.3K |
|
5673
PUT
Kopin
KOPN
$663M
| $64K | ﹤0.01% |
42,100
+28,200
| +203% | +$36.7K |
|
5674
CALL
Loews
L
$23.9B
| $64K | ﹤0.01% |
700
+200
| +40% | +$17.6K |
|
5675
Medifast
MED
$110M
| $64K | ﹤0.01% |
+4,621
| New | +$60.7K |
|
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.