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 | |
|---|---|---|---|---|---|---|
2376
AAR Corp
AIR
$5.15B
| $1.9M | ﹤0.01% |
21,207
+19,696
| +1,304% | +$1.5M |
|
2377
PUT
Mattel
MAT
$4.17B
| $1.9M | ﹤0.01% |
113,000
+55,300
| +96% | +$1.01M |
|
2378
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$90.3M
| $1.9M | ﹤0.01% |
+91,839
| New | +$1.61M |
|
2379
Rithm Capital
RITM
$5.09B
| $1.9M | ﹤0.01% |
166,852
+45,311
| +37% | +$549K |
|
2380
PUT
Arvinas
ARVN
$518M
| $1.9M | ﹤0.01% |
222,900
+36,200
| +19% | +$275K |
|
2381
CALL
UroGen Pharma
URGN
$2B
| $1.9M | ﹤0.01% |
95,100
-89,800
| -49% | -$1.61M |
|
2382
PUT
Host Hotels & Resorts
HST
$16.8B
| $1.89M | ﹤0.01% |
111,200
-62,900
| -36% | -$1.04M |
|
|
CGAU
2383
Centerra Gold
CGAU
$3.22B
| $1.89M | ﹤0.01% |
176,313
+109,617
| +164% | +$874K |
|
2384
CALL
Alight
ALIT
$497M
| $1.89M | ﹤0.01% |
29,000
+7,930
| +38% | +$701K |
|
2385
Sphere Entertainment
SPHR
$4.88B
| $1.89M | ﹤0.01% |
30,419
+28,637
| +1,607% | +$1.35M |
|
2386
CALL
SGHC Ltd
SGHC
$7.3B
| $1.89M | ﹤0.01% |
143,000
+142,800
| +71,400% | +$1.68M |
|
2387
PUT
NCR Voyix
VYX
$1.06B
| $1.89M | ﹤0.01% |
150,400
-18,100
| -11% | -$239K |
|
|
VG
2388
CALL
Venture Global Inc
VG
$35.6B
| $1.89M | ﹤0.01% |
133,000
-175,800
| -57% | -$2.51M |
|
2389
Humana
HUM
$46.7B
| $1.89M | ﹤0.01% |
7,251
-37,386
| -84% | -$9.83M |
|
|
GTM
2390
CALL
ZoomInfo Technologies
GTM
$861M
| $1.89M | ﹤0.01% |
172,900
+29,700
| +21% | +$318K |
|
2391
CALL
Halozyme
HALO
$9.72B
| $1.88M | ﹤0.01% |
25,700
-5,300
| -17% | -$352K |
|
2392
PUT
Equinox Gold
EQX
$7.32B
| $1.88M | ﹤0.01% |
167,700
-69,400
| -29% | -$552K |
|
2393
CALL
Camtek
CAMT
$6.9B
| $1.88M | ﹤0.01% |
17,900
-6,500
| -27% | -$582K |
|
2394
PUT
Lightbridge
LTBR
$246M
| $1.88M | ﹤0.01% |
88,600
+35,900
| +68% | +$540K |
|
2395
CALL
ING
ING
$93.8B
| $1.88M | ﹤0.01% |
72,000
+33,500
| +87% | +$807K |
|
2396
PUT
Brown-Forman Class B
BF.B
$12B
| $1.88M | ﹤0.01% |
69,300
-59,500
| -46% | -$1.72M |
|
2397
PUT
Molina Healthcare
MOH
$10.3B
| $1.88M | ﹤0.01% |
9,800
+3,400
| +53% | +$626K |
|
2398
PUT
Franco-Nevada
FNV
$41.4B
| $1.87M | ﹤0.01% |
8,400
-1,200
| -13% | -$216K |
|
2399
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$293M
| $1.87M | ﹤0.01% |
55,425
+55,163
| +21,055% | +$1.96M |
|
2400
CALL
Carpenter Technology
CRS
$30B
| $1.87M | ﹤0.01% |
7,600
+2,700
| +55% | +$690K |
|
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.