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 | |
|---|---|---|---|---|---|---|
|
RDFN
5476
PUT
DELISTED
Redfin
RDFN
| $78K | ﹤0.01% |
218,600
-98,200
| -31% | -$964K |
|
|
SJT
5477
PUT
San Juan Basin Royalty Trust
SJT
$117M
| $78K | ﹤0.01% |
13,100
+11,200
| +589% | +$68K |
|
|
NSLR
5478
PUT
Neostellar Capital Corp
NSLR
$269M
| $78K | ﹤0.01% |
9,600
-71,500
| -88% | -$426K |
|
5479
CALL
Telos
TLS
$335M
| $78K | ﹤0.01% |
24,800
+11,400
| +85% | +$29.6K |
|
|
TXNM
5480
CALL
TXNM Energy Inc
TXNM
$6.41B
| $78K | ﹤0.01% |
1,400
-16,600
| -92% | -$904K |
|
|
SPYQ
5481
Tradr 2X Long SPY Quarterly ETF
SPYQ
$14.1M
| $78K | ﹤0.01% |
567
+433
| +323% | +$51.5K |
|
|
APLT
5482
CALL
DELISTED
Applied Therapeutics
APLT
| $77K | ﹤0.01% |
250,300
-2,700
| -1% | -$1.04K |
|
5483
Century Aluminum
CENX
$4.43B
| $77K | ﹤0.01% |
+4,290
| New | +$72.8K |
|
5484
PUT
Douglas Elliman
DOUG
$155M
| $77K | ﹤0.01% |
33,300
-4,900
| -13% | -$10.5K |
|
5485
PUT
Hess Midstream
HESM
$5.24B
| $77K | ﹤0.01% |
2,000
+700
| +54% | +$26.7K |
|
5486
CALL
Ituran Location and Control
ITRN
$1.1B
| $77K | ﹤0.01% |
2,000
+1,300
| +186% | +$46.7K |
|
5487
Mattel
MAT
$4.4B
| $77K | ﹤0.01% |
+3,910
| New | +$69.6K |
|
5488
PUT
National CineMedia
NCMI
$371M
| $77K | ﹤0.01% |
+16,000
| New | +$86.8K |
|
5489
PUT
Talkspace
TALK
$873M
| $77K | ﹤0.01% |
27,800
-146,900
| -84% | -$433K |
|
5490
CALL
TTM Technologies
TTMI
$12.3B
| $77K | ﹤0.01% |
1,900
-3,700
| -66% | -$102K |
|
5491
Zillow
Z
$7.81B
| $77K | ﹤0.01% |
+1,110
| New | +$74.8K |
|
5492
CALL
BrightSpring Health Services
BTSG
$11.7B
| $77K | ﹤0.01% |
3,300
+2,300
| +230% | +$48K |
|
|
DHC
5493
CALL
Diversified Healthcare Trust
DHC
$2.15B
| $76K | ﹤0.01% |
21,400
-4,500
| -17% | -$13K |
|
5494
PUT
HCI Group
HCI
$2.26B
| $76K | ﹤0.01% |
+500
| New | +$76.8K |
|
5495
Immunovant
IMVT
$7.9B
| $76K | ﹤0.01% |
+4,806
| New | +$72.7K |
|
5496
Las Vegas Sands
LVS
$31.8B
| $76K | ﹤0.01% |
1,754
-71,986
| -98% | -$2.8M |
|
5497
CALL
MeiraGTx Holdings
MGTX
$1.1B
| $76K | ﹤0.01% |
11,700
+6,300
| +117% | +$37.2K |
|
5498
PUT
N-able
NABL
$868M
| $76K | ﹤0.01% |
9,500
| – | – |
|
5499
PUT
Enpro
NPO
$6.66B
| $76K | ﹤0.01% |
400
-2,800
| -88% | -$479K |
|
|
ACH
5500
PUT
Accendra Health
ACH
$231M
| $76K | ﹤0.01% |
8,400
+5,700
| +211% | +$42K |
|
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.