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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4826
NOV
NOV
$6.84B
| $221K | ﹤0.01% |
+16,692
| New | +$216K |
|
4827
CALL
Quantum-Si Incorporated
QSI
$153M
| $221K | ﹤0.01% |
157,400
+10,200
| +7% | +$14.7K |
|
|
MAGC
4828
Roundhill China Magnificent Seven ETF
MAGC
$14.7M
| $221K | ﹤0.01% |
7,732
+6,466
| +511% | +$170K |
|
4829
PUT
Agree Realty
ADC
$9.66B
| $220K | ﹤0.01% |
3,100
-7,900
| -72% | -$572K |
|
4830
CALL
Butterfly Network
BFLY
$1.86B
| $220K | ﹤0.01% |
114,400
+66,700
| +140% | +$113K |
|
4831
Baytex Energy
BTE
$2.96B
| $220K | ﹤0.01% |
94,331
-17,672
| -16% | -$37.9K |
|
4832
CALL
Morgan Stanley Direct Lending Fund
MSDL
$1.25B
| $220K | ﹤0.01% |
13,700
-100
| -0.7% | -$1.82K |
|
4833
CALL
Vishay Intertechnology
VSH
$4.6B
| $220K | ﹤0.01% |
14,400
-16,700
| -54% | -$265K |
|
|
ASTX
4834
Tradr 2X Long ASTS Daily ETF
ASTX
$240M
| $220K | ﹤0.01% |
+8,222
| New | +$238K |
|
4835
PUT
Gaming and Leisure Properties
GLPI
$13B
| $219K | ﹤0.01% |
4,700
+3,800
| +422% | +$179K |
|
4836
PUT
Personalis
PSNL
$1.25B
| $219K | ﹤0.01% |
33,700
-6,900
| -17% | -$39.3K |
|
4837
CALL
AutoNation
AN
$7.7B
| $218K | ﹤0.01% |
1,000
-400
| -29% | -$84.3K |
|
4838
CALL
First American
FAF
$7.98B
| $218K | ﹤0.01% |
3,400
+2,600
| +325% | +$164K |
|
|
HOUS
4839
PUT
DELISTED
Anywhere Real Estate
HOUS
| $218K | ﹤0.01% |
20,600
+1,300
| +7% | +$7.64K |
|
|
PBPB
4840
CALL
DELISTED
Potbelly
PBPB
| $218K | ﹤0.01% |
12,800
+12,700
| +12,700% | +$172K |
|
4841
PUT
Seanergy Maritime Holdings
SHIP
$349M
| $218K | ﹤0.01% |
26,500
+13,700
| +107% | +$104K |
|
|
CRWL
4842
GraniteShares 2x Long CRWD Daily ETF
CRWL
$37.3M
| $218K | ﹤0.01% |
6,033
-574
| -9% | -$18.8K |
|
4843
Aemetis
AMTX
$99.2M
| $217K | ﹤0.01% |
96,843
-2,234
| -2% | -$5.93K |
|
4844
PUT
Galectin Therapeutics
GALT
$230M
| $217K | ﹤0.01% |
51,300
-8,600
| -14% | -$32.4K |
|
|
HAPN
4845
PUT
Happen Inc
HAPN
$2.14B
| $217K | ﹤0.01% |
14,300
-37,600
| -72% | -$570K |
|
|
ODP
4846
CALL
DELISTED
ODP
ODP
| $217K | ﹤0.01% |
7,800
+7,500
| +2,500% | +$154K |
|
4847
CALL
Pool Corp
POOL
$7.05B
| $217K | ﹤0.01% |
700
-7,500
| -91% | -$2.35M |
|
|
4848
Quantum-Si Incorporated
QSI
$153M
| $217K | ﹤0.01% |
154,083
+48,549
| +46% | +$70.2K |
|
|
NSLR
4849
CALL
Neostellar Capital Corp
NSLR
$258M
| $217K | ﹤0.01% |
24,200
-70,000
| -74% | -$607K |
|
4850
Starwood Property Trust
STWD
$6.12B
| $217K | ﹤0.01% |
11,211
-26,577
| -70% | -$535K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.