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 | |
|---|---|---|---|---|---|---|
7776
Transportadora de Gas del Sur
TGS
$4.57B
| $12K | ﹤0.01% |
595
+112
| +23% | +$2.9K |
|
7777
Tennant Co
TNC
$1.48B
| $12K | ﹤0.01% |
149
-465
| -76% | -$38K |
|
|
TRUE
7778
CALL
DELISTED
TrueCar
TRUE
| $12K | ﹤0.01% |
7,000
+800
| +13% | +$1.61K |
|
7779
GraniteShares 2x Short TSLA Daily ETF
TSDD
$42.6M
| $12K | ﹤0.01% |
1,285
+1,193
| +1,297% | +$22.1K |
|
7780
ProShares UltraPro S&P 500
UPRO
$5.06B
| $12K | ﹤0.01% |
115
-1,484
| -93% | -$149K |
|
|
VRNT
7781
DELISTED
Verint Systems
VRNT
| $12K | ﹤0.01% |
601
-14,074
| -96% | -$290K |
|
7782
CALL
Verra Mobility
VRRM
$635M
| $12K | ﹤0.01% |
500
-31,900
| -98% | -$789K |
|
|
VTYX
7783
PUT
DELISTED
Ventyx Biosciences
VTYX
| $12K | ﹤0.01% |
4,000
+1,500
| +60% | +$3.97K |
|
|
YSG
7784
PUT
Yatsen Holding
YSG
$320M
| $12K | ﹤0.01% |
1,400
-1,200
| -46% | -$11.4K |
|
7785
CALL
Centuri Holdings
CTRI
$2.72B
| $12K | ﹤0.01% |
600
+500
| +500% | +$10.6K |
|
|
ZK
7786
CALL
DELISTED
Zeekr
ZK
| $12K | ﹤0.01% |
400
-22,100
| -98% | -$640K |
|
|
TECX
7787
Tectonic Therapeutic
TECX
$576M
| $12K | ﹤0.01% |
+768
| New | +$15.8K |
|
|
IONL
7788
GraniteShares 2x Long IONQ Daily ETF
IONL
$45.7M
| $12K | ﹤0.01% |
+145
| New | +$8.05K |
|
|
LDRX
7789
CALL
SGI Enhanced Market Leaders ETF
LDRX
$241M
| $12K | ﹤0.01% |
200
-100
| -33% | -$3.06K |
|
|
BSCI
7790
CALL
DELISTED
Invesco BulletShares 2018 Corporate Bond ETF
BSCI
| $12K | ﹤0.01% |
+200
| New | +$12K |
|
7791
CALL
Aclaris Therapeutics
ACRS
$757M
| $11K | ﹤0.01% |
6,200
+2,500
| +68% | +$4.36K |
|
7792
Amcor
AMCR
$20.8B
| $11K | ﹤0.01% |
285
-22,751
| -99% | -$1.02M |
|
7793
American Well
AMWL
$185M
| $11K | ﹤0.01% |
1,846
+998
| +118% | +$7.34K |
|
7794
PUT
Azenta
AZTA
$1.26B
| $11K | ﹤0.01% |
400
+200
| +100% | +$6.2K |
|
7795
PUT
Brink's
BCO
$4.96B
| $11K | ﹤0.01% |
100
-1,100
| -92% | -$115K |
|
7796
CALL
BGC Group
BGC
$5.57B
| $11K | ﹤0.01% |
1,200
-16,800
| -93% | -$168K |
|
7797
CALL
BOK Financial
BOKF
$8.64B
| $11K | ﹤0.01% |
+100
| New | +$10.7K |
|
7798
Compugen
CGEN
$223M
| $11K | ﹤0.01% |
8,062
+1,471
| +22% | +$2.19K |
|
7799
PUT
Coherus Oncology
CHRS
$225M
| $11K | ﹤0.01% |
6,900
-400
| -5% | -$445 |
|
7800
CALL
Conduent
CNDT
$240M
| $11K | ﹤0.01% |
4,000
| – | – |
|
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.