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 | |
|---|---|---|---|---|---|---|
3276
PUT
Jacobs Solutions
J
$16B
| $621K | ﹤0.01% |
5,900
+4,587
| +349% | +$566K |
|
3277
Sociedad Química y Minera de Chile
SQM
$19.6B
| $620K | ﹤0.01% |
17,592
+7,069
| +67% | +$242K |
|
|
HIMX
3278
PUT
Himax Technologies
HIMX
$2.22B
| $619K | ﹤0.01% |
69,400
-13,400
| -16% | -$105K |
|
3279
PUT
Itaú Unibanco
ITUB
$92.3B
| $619K | ﹤0.01% |
93,936
-67,156
| -42% | -$409K |
|
3280
Life Time Group Holdings
LTH
$9.74B
| $619K | ﹤0.01% |
20,414
-26,919
| -57% | -$799K |
|
3281
Vale
VALE
$62.9B
| $619K | ﹤0.01% |
63,838
-133,140
| -68% | -$1.25M |
|
|
DFDV
3282
DeFi Development Corp
DFDV
$82.2M
| $618K | ﹤0.01% |
+31,732
| New | +$457K |
|
3283
CALL
Xponential Fitness
XPOF
$278M
| $618K | ﹤0.01% |
82,600
-36,400
| -31% | -$302K |
|
3284
PUT
Dave Inc
DAVE
$5.16B
| $617K | ﹤0.01% |
2,300
-3,700
| -62% | -$583K |
|
3285
PUT
INmune Bio
INMB
$46M
| $616K | ﹤0.01% |
266,900
+238,100
| +827% | +$1.75M |
|
|
BPMC
3286
CALL
DELISTED
Blueprint Medicines
BPMC
| $615K | ﹤0.01% |
4,800
-5,500
| -53% | -$571K |
|
|
SUPV
3287
PUT
Grupo Supervielle
SUPV
$857M
| $615K | ﹤0.01% |
58,100
-11,900
| -17% | -$161K |
|
3288
PUT
Smith & Wesson
SWBI
$666M
| $615K | ﹤0.01% |
70,900
+44,400
| +168% | +$421K |
|
3289
CALL
Aspen Aerogels
ASPN
$385M
| $613K | ﹤0.01% |
103,700
-22,600
| -18% | -$130K |
|
3290
PUT
Harrow
HROW
$1.4B
| $613K | ﹤0.01% |
20,100
-47,500
| -70% | -$1.28M |
|
|
SAFE
3291
CALL
Safehold
SAFE
$1.19B
| $613K | ﹤0.01% |
39,400
-900
| -2% | -$14K |
|
3292
Cemex
CX
$17.6B
| $611K | ﹤0.01% |
88,203
+37,692
| +75% | +$239K |
|
3293
CALL
Warby Parker
WRBY
$3.05B
| $611K | ﹤0.01% |
27,900
+26,900
| +2,690% | +$497K |
|
3294
Emcor
EME
$33B
| $609K | ﹤0.01% |
1,139
-4,941
| -81% | -$2.18M |
|
3295
CALL
Axos Financial
AX
$5.45B
| $608K | ﹤0.01% |
8,000
+3,800
| +90% | +$257K |
|
3296
CALL
Compass Diversified
CODI
$755M
| $607K | ﹤0.01% |
96,800
+90,800
| +1,513% | +$1.01M |
|
|
TBCH
3297
PUT
Turtle Beach Corp
TBCH
$245M
| $607K | ﹤0.01% |
43,900
+4,800
| +12% | +$57.3K |
|
|
MRP
3298
CALL
Millrose Properties Inc
MRP
$4.72B
| $607K | ﹤0.01% |
21,300
+7,600
| +55% | +$201K |
|
3299
PUT
Rayonier Advanced Materials
RYAM
$573M
| $606K | ﹤0.01% |
157,600
-163,000
| -51% | -$685K |
|
3300
Funko
FNKO
$342M
| $604K | ﹤0.01% |
127,053
+125,857
| +10,523% | +$574K |
|
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.