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 | |
|---|---|---|---|---|---|---|
|
NIU
5301
Niu Technologies
NIU
$203M
| $94K | ﹤0.01% |
28,167
+14,190
| +102% | +$48.8K |
|
5302
CALL
NerdWallet
NRDS
$592M
| $94K | ﹤0.01% |
8,600
-12,900
| -60% | -$129K |
|
5303
PUT
Pricesmart
PSMT
$5.94B
| $94K | ﹤0.01% |
+900
| New | +$90.8K |
|
|
RWT
5304
CALL
Redwood Trust
RWT
$585M
| $94K | ﹤0.01% |
16,000
+7,100
| +80% | +$40.3K |
|
5305
Valley National Bancorp
VLY
$7.92B
| $94K | ﹤0.01% |
10,595
-47,535
| -82% | -$413K |
|
5306
Xometry
XMTR
$4.69B
| $94K | ﹤0.01% |
+2,797
| New | +$82K |
|
|
ACB
5307
Aurora Cannabis
ACB
$175M
| $93K | ﹤0.01% |
22,065
+16,694
| +311% | +$80.9K |
|
5308
PUT
Dianthus Therapeutics
DNTH
$6.16B
| $93K | ﹤0.01% |
5,000
+200
| +4% | +$3.75K |
|
5309
Excelerate Energy
EE
$1.22B
| $93K | ﹤0.01% |
+3,186
| New | +$89.4K |
|
5310
iShares MSCI Poland ETF
EPOL
$699M
| $93K | ﹤0.01% |
+2,907
| New | +$85.9K |
|
5311
PUT
Extreme Networks
EXTR
$3.9B
| $93K | ﹤0.01% |
5,200
-19,000
| -79% | -$280K |
|
|
JAMF
5312
CALL
DELISTED
Jamf
JAMF
| $93K | ﹤0.01% |
9,800
-96,900
| -91% | -$1.04M |
|
5313
Global X Lithium & Battery Tech ETF
LIT
$1.53B
| $93K | ﹤0.01% |
2,440
-6,332
| -72% | -$234K |
|
5314
CALL
Mativ Holdings
MATV
$472M
| $93K | ﹤0.01% |
13,700
-2,200
| -14% | -$12.7K |
|
5315
CALL
OceanFirst Financial
OCFC
$1.71B
| $93K | ﹤0.01% |
+5,300
| New | +$88.4K |
|
|
ACH
5316
CALL
Accendra Health
ACH
$256M
| $93K | ﹤0.01% |
10,300
-7,200
| -41% | -$53.1K |
|
|
SF
5317
CALL
Stifel
SF
$12.5B
| $93K | ﹤0.01% |
1,350
-900
| -40% | -$55.3K |
|
5318
CALL
Verisk Analytics
VRSK
$26.1B
| $93K | ﹤0.01% |
300
-1,800
| -86% | -$546K |
|
5319
CALL
Applied Industrial Technologies
AIT
$12.6B
| $92K | ﹤0.01% |
400
+300
| +300% | +$68.2K |
|
5320
Comtech Telecommunications
CMTL
$50.9M
| $92K | ﹤0.01% |
37,795
+22,040
| +140% | +$39.7K |
|
5321
CVRx
CVRX
$143M
| $92K | ﹤0.01% |
15,813
+15,254
| +2,729% | +$105K |
|
5322
CapForce IBD 50 ETF
FFTY
$80.3M
| $92K | ﹤0.01% |
2,861
+1,138
| +66% | +$32.5K |
|
5323
CALL
QuidelOrtho
QDEL
$1.13B
| $92K | ﹤0.01% |
3,200
-57,200
| -95% | -$1.69M |
|
5324
CALL
Sinclair Inc
SBGI
$994M
| $92K | ﹤0.01% |
6,700
-3,200
| -32% | -$45.5K |
|
5325
CALL
Skywest
SKYW
$4.29B
| $92K | ﹤0.01% |
900
-8,400
| -90% | -$798K |
|
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.