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 | |
|---|---|---|---|---|---|---|
2826
Five Below
FIVE
$11.2B
| $957K | ﹤0.01% |
7,296
-26,586
| -78% | -$2.59M |
|
2827
PUT
BioCryst Pharmaceuticals
BCRX
$2.37B
| $956K | ﹤0.01% |
106,800
+23,800
| +29% | +$222K |
|
|
MOMO
2828
CALL
Hello Group
MOMO
$869M
| $955K | ﹤0.01% |
113,200
+55,600
| +97% | +$364K |
|
2829
CALL
Larimar Therapeutics
LRMR
$416M
| $954K | ﹤0.01% |
330,200
+317,400
| +2,480% | +$735K |
|
|
SPR
2830
CALL
DELISTED
Spirit AeroSystems
SPR
| $953K | ﹤0.01% |
25,000
-200
| -0.8% | -$7.19K |
|
2831
CALL
Braze
BRZE
$2.45B
| $952K | ﹤0.01% |
33,900
-96,600
| -74% | -$3.05M |
|
2832
PUT
AMC Global Media
AMCX
$430M
| $950K | ﹤0.01% |
151,600
+116,200
| +328% | +$734K |
|
2833
PUT
Axos Financial
AX
$5.45B
| $950K | ﹤0.01% |
12,500
-45,300
| -78% | -$3.06M |
|
2834
PUT
Raymond James Financial
RJF
$32.5B
| $950K | ﹤0.01% |
6,200
-17,100
| -73% | -$2.45M |
|
|
SW
2835
CALL
Smurfit Westrock
SW
$25.5B
| $949K | ﹤0.01% |
22,000
+9,600
| +77% | +$411K |
|
2836
CALL
CoreCivic
CXW
$3.1B
| $948K | ﹤0.01% |
45,000
-65,300
| -59% | -$1.41M |
|
2837
Stellantis
STLA
$16.5B
| $948K | ﹤0.01% |
94,589
-166,952
| -64% | -$1.65M |
|
2838
PUT
Viking Holdings
VIK
$44.9B
| $948K | ﹤0.01% |
17,800
-17,500
| -50% | -$772K |
|
|
OTLY
2839
PUT
Oatly Group
OTLY
$417M
| $947K | ﹤0.01% |
79,800
+22,300
| +39% | +$235K |
|
|
ITOS
2840
CALL
DELISTED
iTeos Therapeutics
ITOS
| $945K | ﹤0.01% |
94,800
+44,400
| +88% | +$358K |
|
2841
PUT
Wendy's
WEN
$1.33B
| $944K | ﹤0.01% |
82,700
-201,800
| -71% | -$2.46M |
|
2842
PUT
Invesco
IVZ
$13.3B
| $943K | ﹤0.01% |
59,800
+36,700
| +159% | +$527K |
|
2843
ProShares UltraPro Dow 30
UDOW
$849M
| $943K | ﹤0.01% |
19,982
+14,066
| +238% | +$567K |
|
2844
Ollie's Bargain Outlet
OLLI
$4.01B
| $942K | ﹤0.01% |
+7,155
| New | +$819K |
|
2845
CALL
Icahn Enterprises
IEP
$5.17B
| $940K | ﹤0.01% |
116,900
-87,100
| -43% | -$745K |
|
|
BTC
2846
PUT
Grayscale Bitcoin Mini Trust ETF
BTC
$3.4B
| $940K | ﹤0.01% |
19,700
-48,300
| -71% | -$2.11M |
|
2847
Invesco KBW Bank ETF
KBWB
$7.08B
| $937K | ﹤0.01% |
13,094
-10,743
| -45% | -$681K |
|
2848
ARK Genomic Revolution ETF
ARKG
$1.51B
| $936K | ﹤0.01% |
+38,448
| New | +$842K |
|
2849
Ferguson
FERG
$44.7B
| $934K | ﹤0.01% |
+4,293
| New | +$790K |
|
2850
PUT
Melco Resorts & Entertainment
MLCO
$2.1B
| $933K | ﹤0.01% |
129,100
+5,600
| +5% | +$32.6K |
|
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.