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 | |
|---|---|---|---|---|---|---|
3551
PUT
IAMGOLD
IAG
$8.5B
| $480K | ﹤0.01% |
65,400
-3,100
| -5% | -$21.7K |
|
3552
NETGEAR
NTGR
$681M
| $480K | ﹤0.01% |
16,519
-30,936
| -65% | -$831K |
|
3553
PUT
BuzzFeed
BZFD
$94.1M
| $479K | ﹤0.01% |
239,700
+116,300
| +94% | +$230K |
|
3554
Macy's
M
$6.57B
| $479K | ﹤0.01% |
41,145
-117,141
| -74% | -$1.36M |
|
3555
Structure Therapeutics
GPCR
$3.46B
| $478K | ﹤0.01% |
23,094
+2,490
| +12% | +$54.8K |
|
3556
Neogen
NEOG
$2.03B
| $478K | ﹤0.01% |
100,028
+73,024
| +270% | +$419K |
|
3557
Prime Medicine
PRME
$544M
| $478K | ﹤0.01% |
193,615
+185,239
| +2,212% | +$286K |
|
3558
PUT
Spire Global
SPIR
$432M
| $478K | ﹤0.01% |
40,200
+20,800
| +107% | +$210K |
|
3559
CALL
SouthState Bank Corp
SSB
$10.2B
| $478K | ﹤0.01% |
+5,200
| New | +$457K |
|
3560
PUT
Tilray
TLRY
$498M
| $477K | ﹤0.01% |
115,240
-42,430
| -27% | -$193K |
|
3561
W.P. Carey
WPC
$17B
| $477K | ﹤0.01% |
7,650
-936
| -11% | -$57.6K |
|
3562
AZZ Inc
AZZ
$4.47B
| $475K | ﹤0.01% |
5,038
+4,751
| +1,655% | +$419K |
|
3563
PUT
Keysight
KEYS
$53.6B
| $475K | ﹤0.01% |
2,900
-9,100
| -76% | -$1.39M |
|
3564
Shake Shack
SHAK
$2.48B
| $475K | ﹤0.01% |
3,384
-9,097
| -73% | -$991K |
|
3565
PUT
POET Technologies
POET
$1.22B
| $474K | ﹤0.01% |
91,100
+40,600
| +80% | +$171K |
|
3566
Perrigo
PRGO
$1.4B
| $474K | ﹤0.01% |
+17,761
| New | +$465K |
|
3567
CALL
Renasant Corp
RNST
$4B
| $474K | ﹤0.01% |
+13,200
| New | +$440K |
|
3568
CALL
Sprinklr
CXM
$1.42B
| $473K | ﹤0.01% |
56,000
-37,600
| -40% | -$301K |
|
3569
Cogent Communications
CCOI
$612M
| $472K | ﹤0.01% |
+9,803
| New | +$498K |
|
|
GES
3570
DELISTED
Guess Inc
GES
| $472K | ﹤0.01% |
39,095
+37,283
| +2,058% | +$416K |
|
3571
CALL
Orion
OEC
$379M
| $472K | ﹤0.01% |
45,000
-5,500
| -11% | -$62.2K |
|
3572
CALL
Weatherford International
WFRD
$6.16B
| $472K | ﹤0.01% |
9,400
-3,600
| -28% | -$167K |
|
|
DFTX
3573
PUT
Definium Therapeutics
DFTX
$5.66B
| $469K | ﹤0.01% |
72,300
+5,800
| +9% | +$38.1K |
|
3574
PUT
Mettler-Toledo International
MTD
$27B
| $469K | ﹤0.01% |
400
-800
| -67% | -$894K |
|
3575
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$177M
| $469K | ﹤0.01% |
+12,716
| New | +$492K |
|
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.