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 | |
|---|---|---|---|---|---|---|
2226
PUT
VICI Properties
VICI
$29.4B
| $2.21M | ﹤0.01% |
67,800
+54,700
| +418% | +$1.8M |
|
2227
PUT
Cogent Communications
CCOI
$594M
| $2.21M | ﹤0.01% |
57,600
+16,700
| +41% | +$697K |
|
2228
AeroVironment
AVAV
$7.57B
| $2.21M | ﹤0.01% |
7,010
+5,488
| +361% | +$1.42M |
|
2229
Sonos
SONO
$1.75B
| $2.2M | ﹤0.01% |
139,519
+104,802
| +302% | +$1.35M |
|
2230
CALL
AvalonBay Communities
AVB
$27.1B
| $2.2M | ﹤0.01% |
11,400
-2,100
| -16% | -$409K |
|
2231
PUT
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $2.2M | ﹤0.01% |
26,900
-16,000
| -37% | -$939K |
|
2232
Scotiabank
BNS
$106B
| $2.19M | ﹤0.01% |
+33,924
| New | +$2M |
|
2233
PUT
Idacorp
IDA
$8.23B
| $2.19M | ﹤0.01% |
16,600
+14,100
| +564% | +$1.75M |
|
2234
PUT
Galicia Financial Group
GGAL
$7.92B
| $2.19M | ﹤0.01% |
79,400
+29,700
| +60% | +$1.28M |
|
2235
CALL
HCI Group
HCI
$2.28B
| $2.19M | ﹤0.01% |
11,400
+7,600
| +200% | +$1.2M |
|
|
TPC
2236
PUT
Tutor Perini Cor
TPC
$4.57B
| $2.18M | ﹤0.01% |
33,300
+1,500
| +5% | +$83.6K |
|
|
SW
2237
CALL
Smurfit Westrock
SW
$25.5B
| $2.18M | ﹤0.01% |
51,300
+29,300
| +133% | +$1.33M |
|
2238
SentinelOne
S
$6.22B
| $2.18M | ﹤0.01% |
123,899
+83,790
| +209% | +$1.5M |
|
|
PPLC
2239
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $2.18M | ﹤0.01% |
43,300
-86,000
| -67% | -$4.33M |
|
2240
Ouster
OUST
$2.29B
| $2.18M | ﹤0.01% |
80,450
+78,433
| +3,889% | +$2.19M |
|
|
AMTM
2241
CALL
Amentum Holdings
AMTM
$5.51B
| $2.17M | ﹤0.01% |
90,800
-7,900
| -8% | -$192K |
|
2242
CALL
Sterling Infrastructure
STRL
$20.3B
| $2.17M | ﹤0.01% |
6,400
+4,100
| +178% | +$1.16M |
|
2243
CALL
Telus
TU
$16B
| $2.17M | ﹤0.01% |
137,800
+60,100
| +77% | +$975K |
|
2244
PUT
Arcturus Therapeutics
ARCT
$157M
| $2.17M | ﹤0.01% |
117,900
+100,700
| +585% | +$1.62M |
|
2245
Antero Resources
AR
$10.9B
| $2.17M | ﹤0.01% |
64,616
+31,190
| +93% | +$1.04M |
|
2246
Dell
DELL
$283B
| $2.17M | ﹤0.01% |
15,296
-49,178
| -76% | -$6.38M |
|
2247
PUT
Polaris
PII
$4.15B
| $2.17M | ﹤0.01% |
37,300
-14,200
| -28% | -$766K |
|
|
HIVE
2248
PUT
HIVE Digital Technologies
HIVE
$792M
| $2.17M | ﹤0.01% |
537,900
+462,200
| +611% | +$1.24M |
|
2249
CALL
F5
FFIV
$22.1B
| $2.17M | ﹤0.01% |
6,700
-9,600
| -59% | -$3.01M |
|
2250
CALL
Cheesecake Factory
CAKE
$4.21B
| $2.16M | ﹤0.01% |
39,600
+23,600
| +148% | +$1.44M |
|
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.