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 | |
|---|---|---|---|---|---|---|
4351
PUT
Acadia Pharmaceuticals
ACAD
$4.53B
| $232K | ﹤0.01% |
10,800
-20,900
| -66% | -$388K |
|
4352
PUT
Aegon
AEG
$13.5B
| $232K | ﹤0.01% |
32,100
+24,900
| +346% | +$166K |
|
4353
CALL
Brookfield Infrastructure
BIPC
$5.33B
| $232K | ﹤0.01% |
5,600
+1,600
| +40% | +$61.6K |
|
4354
CALL
LoveSac
LOVE
$248M
| $232K | ﹤0.01% |
12,800
+6,500
| +103% | +$123K |
|
4355
PUT
Northwest Bancshares
NWBI
$2.33B
| $232K | ﹤0.01% |
+18,200
| New | +$221K |
|
4356
Oshkosh
OSK
$9.06B
| $232K | ﹤0.01% |
2,044
+334
| +20% | +$32.4K |
|
4357
BRC Group Holdings
RILY
$270M
| $232K | ﹤0.01% |
78,287
+3,303
| +4% | +$10.1K |
|
4358
CALL
Atlas Energy Solutions
AESI
$1.32B
| $231K | ﹤0.01% |
17,300
-58,700
| -77% | -$802K |
|
4359
CALL
Atmos Energy
ATO
$29.8B
| $231K | ﹤0.01% |
+1,500
| New | +$233K |
|
4360
PUT
Compass Minerals
CMP
$1.25B
| $231K | ﹤0.01% |
11,500
-29,200
| -72% | -$472K |
|
4361
iShares Russell 1000 ETF
IWB
$48B
| $231K | ﹤0.01% |
+681
| New | +$214K |
|
4362
CALL
Universal Display
OLED
$3.81B
| $231K | ﹤0.01% |
1,500
-3,200
| -68% | -$448K |
|
4363
Simplify Interest Rate Hedge ETF
PFIX
$168M
| $231K | ﹤0.01% |
4,382
+4,259
| +3,463% | +$238K |
|
4364
Tyler Technologies
TYL
$14.2B
| $231K | ﹤0.01% |
+390
| New | +$221K |
|
4365
CALL
Invesco Mortgage Capital
IVR
$764M
| $230K | ﹤0.01% |
29,400
+700
| +2% | +$5.16K |
|
|
WBA
4366
DELISTED
Walgreens Boots Alliance
WBA
| $230K | ﹤0.01% |
20,059
-220,091
| -92% | -$2.45M |
|
4367
United Parks & Resorts
PRKS
$2.22B
| $230K | ﹤0.01% |
4,891
+3,955
| +423% | +$177K |
|
|
JBS
4368
JBS N.V.
JBS
$46.8B
| $230K | ﹤0.01% |
+15,756
| New | +$222K |
|
4369
CALL
Cirrus Logic
CRUS
$6.87B
| $229K | ﹤0.01% |
2,200
-5,500
| -71% | -$539K |
|
4370
Gran Tierra Energy
GTE
$233M
| $229K | ﹤0.01% |
48,063
+43,684
| +998% | +$207K |
|
4371
CALL
Medallion Financial
MFIN
$230M
| $229K | ﹤0.01% |
24,100
+17,200
| +249% | +$156K |
|
4372
PUT
Advanced Drainage Systems
WMS
$10.7B
| $229K | ﹤0.01% |
2,000
-17,000
| -89% | -$1.9M |
|
4373
Kanzhun
BZ
$7.31B
| $228K | ﹤0.01% |
+12,810
| New | +$215K |
|
4374
Omnicell
OMCL
$2.01B
| $228K | ﹤0.01% |
7,786
+4,990
| +178% | +$149K |
|
4375
CALL
American Financial Group
AFG
$11.9B
| $227K | ﹤0.01% |
1,800
+800
| +80% | +$100K |
|
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.