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 | |
|---|---|---|---|---|---|---|
4401
CALL
AMC Global Media
AMCX
$450M
| $221K | ﹤0.01% |
35,400
+10,200
| +40% | +$64.4K |
|
|
OPTU
4402
CALL
Optimum Communications Inc
OPTU
$298M
| $221K | ﹤0.01% |
103,500
+41,900
| +68% | +$98.2K |
|
|
PPLI
4403
People Inc
PPLI
$3.12B
| $221K | ﹤0.01% |
+5,937
| New | +$215K |
|
4404
CALL
Sixth Street Specialty
TSLX
$1.67B
| $221K | ﹤0.01% |
9,300
+9,000
| +3,000% | +$198K |
|
4405
CALL
Dorman Products
DORM
$4.22B
| $220K | ﹤0.01% |
1,800
-3,500
| -66% | -$426K |
|
4406
Matthews International
MATW
$887M
| $220K | ﹤0.01% |
9,236
+9,034
| +4,472% | +$190K |
|
4407
PUT
NeoGenomics
NEO
$1.99B
| $220K | ﹤0.01% |
30,200
+15,100
| +100% | +$122K |
|
4408
PUT
Blue Owl Capital
OBDC
$5.35B
| $220K | ﹤0.01% |
15,400
-21,000
| -58% | -$298K |
|
4409
Navitas Semiconductor
NVTS
$2.54B
| $219K | ﹤0.01% |
33,470
-73,064
| -69% | -$282K |
|
4410
Regal Rexnord
RRX
$12.5B
| $219K | ﹤0.01% |
1,514
+1,158
| +325% | +$145K |
|
4411
CALL
Service Corp International
SCI
$11.8B
| $219K | ﹤0.01% |
2,700
-15,100
| -85% | -$1.18M |
|
4412
CALL
Stratasys
SSYS
$666M
| $219K | ﹤0.01% |
19,100
-90,100
| -83% | -$914K |
|
4413
CALL
Sunoco
SUN
$14.4B
| $219K | ﹤0.01% |
4,100
-11,900
| -74% | -$657K |
|
4414
PUT
Standex International
SXI
$3.33B
| $219K | ﹤0.01% |
+1,400
| New | +$210K |
|
4415
Atea Pharmaceuticals
AVIR
$370M
| $218K | ﹤0.01% |
+60,584
| New | +$181K |
|
4416
CALL
Bausch + Lomb
BLCO
$5.78B
| $218K | ﹤0.01% |
16,800
-14,900
| -47% | -$179K |
|
4417
CALL
RenaissanceRe
RNR
$13.8B
| $218K | ﹤0.01% |
900
-4,800
| -84% | -$1.16M |
|
4418
CALL
Assurant
AIZ
$13.9B
| $217K | ﹤0.01% |
1,100
-100
| -8% | -$19.7K |
|
|
DEA
4419
CALL
Easterly Government Properties
DEA
$1.16B
| $217K | ﹤0.01% |
9,800
+2,680
| +38% | +$58.5K |
|
4420
CALL
Ferguson
FERG
$43.9B
| $217K | ﹤0.01% |
1,000
-7,600
| -88% | -$1.4M |
|
4421
PUT
TD Synnex
SNX
$19.9B
| $217K | ﹤0.01% |
1,600
-1,700
| -52% | -$200K |
|
4422
ProShares Ultra Gold
UGL
$649M
| $217K | ﹤0.01% |
6,285
-11,055
| -64% | -$384K |
|
4423
PUT
Build-A-Bear
BBW
$445M
| $216K | ﹤0.01% |
4,200
-800
| -16% | -$33.9K |
|
4424
CALL
Kimco Realty
KIM
$17.5B
| $216K | ﹤0.01% |
10,300
-6,100
| -37% | -$126K |
|
|
SFIX
4425
CALL
Stitch Fix
SFIX
$567M
| $216K | ﹤0.01% |
58,600
+38,900
| +197% | +$146K |
|
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.