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 | |
|---|---|---|---|---|---|---|
3501
CALL
CVR Energy
CVI
$3.43B
| $504K | ﹤0.01% |
18,800
-22,500
| -54% | -$495K |
|
3502
PUT
Fiverr
FVRR
$398M
| $504K | ﹤0.01% |
17,200
+2,800
| +19% | +$80.6K |
|
3503
CALL
H&R Block
HRB
$5.37B
| $504K | ﹤0.01% |
9,200
+3,000
| +48% | +$173K |
|
3504
CALL
Robert Half
RHI
$4.07B
| $504K | ﹤0.01% |
12,300
-2,500
| -17% | -$114K |
|
3505
PUT
Establishment Labs
ESTA
$2.71B
| $503K | ﹤0.01% |
11,800
+10,200
| +638% | +$356K |
|
3506
PUT
Fastly Inc
FSLY
$3.14B
| $503K | ﹤0.01% |
71,300
-95,800
| -57% | -$642K |
|
3507
CALL
Remitly
RELY
$4.77B
| $503K | ﹤0.01% |
26,800
-22,500
| -46% | -$468K |
|
3508
CALL
Morningstar
MORN
$6.94B
| $502K | ﹤0.01% |
1,600
-500
| -24% | -$148K |
|
3509
CALL
Olin
OLN
$2.49B
| $502K | ﹤0.01% |
25,000
+900
| +4% | +$18.7K |
|
|
APPX
3510
PUT
Tradr 2X Long APP Daily ETF
APPX
$64.6M
| $502K | ﹤0.01% |
+7,600
| New | +$315K |
|
3511
PUT
ScottsMiracle-Gro
SMG
$4.06B
| $501K | ﹤0.01% |
7,600
-20,100
| -73% | -$1.16M |
|
|
WCC
3512
PUT
WESCO International
WCC
$16.5B
| $500K | ﹤0.01% |
2,700
+1,700
| +170% | +$280K |
|
3513
Copa Holdings
CPA
$5.65B
| $499K | ﹤0.01% |
4,539
+2,187
| +93% | +$216K |
|
3514
Direxion Daily Energy Bull 2X ETF
ERX
$229M
| $499K | ﹤0.01% |
9,728
-7,875
| -45% | -$393K |
|
3515
CALL
Rhythm Pharmaceuticals
RYTM
$7.28B
| $499K | ﹤0.01% |
7,900
+300
| +4% | +$18.4K |
|
3516
CALL
Synaptics
SYNA
$4.55B
| $499K | ﹤0.01% |
7,700
+4,300
| +126% | +$253K |
|
3517
Planet Labs
PL
$7.48B
| $498K | ﹤0.01% |
81,781
+38,677
| +90% | +$158K |
|
|
UCTT
3518
PUT
Ultra Clean Holdings
UCTT
$3.9B
| $498K | ﹤0.01% |
22,100
| – | – |
|
3519
CALL
1-800-Flowers.com
FLWS
$245M
| $497K | ﹤0.01% |
101,200
+61,100
| +152% | +$316K |
|
3520
Icahn Enterprises
IEP
$5.19B
| $497K | ﹤0.01% |
+61,824
| New | +$529K |
|
3521
CALL
SI-BONE Inc
SIBN
$756M
| $496K | ﹤0.01% |
26,400
+25,400
| +2,540% | +$421K |
|
3522
CALL
Vishay Intertechnology
VSH
$5.7B
| $493K | ﹤0.01% |
31,100
-15,500
| -33% | -$215K |
|
|
TUZ
3523
PUT
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $493K | ﹤0.01% |
7,700
+500
| +7% | +$32K |
|
3524
CALL
The Greenbrier Companies
GBX
$1.56B
| $492K | ﹤0.01% |
10,700
+7,400
| +224% | +$331K |
|
3525
Iovance Biotherapeutics
IOVA
$2.19B
| $492K | ﹤0.01% |
286,589
+244,025
| +573% | +$607K |
|
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.