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 | |
|---|---|---|---|---|---|---|
5951
CALL
CRA International
CRAI
$1.17B
| $83K | ﹤0.01% |
+400
| New | +$76.8K |
|
5952
eBay
EBAY
$50.1B
| $83K | ﹤0.01% |
+923
| New | +$81.6K |
|
5953
Eagle Bancorp
EGBN
$834M
| $83K | ﹤0.01% |
+4,123
| New | +$79.9K |
|
5954
CALL
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$551M
| $83K | ﹤0.01% |
1,200
+1,000
| +500% | +$66.8K |
|
5955
PUT
IHS Holding
IHS
$2.76B
| $83K | ﹤0.01% |
12,300
-1,200
| -9% | -$8.02K |
|
5956
Lands' End
LE
$369M
| $83K | ﹤0.01% |
5,915
-32,147
| -84% | -$428K |
|
|
MTLS
5957
Materialise
MTLS
$368M
| $83K | ﹤0.01% |
+14,969
| New | +$80.2K |
|
|
PMT
5958
PUT
PennyMac Mortgage Investment
PMT
$808M
| $83K | ﹤0.01% |
6,800
-15,900
| -70% | -$196K |
|
|
EMA
5959
Emera Inc
EMA
$16.5B
| $83K | ﹤0.01% |
+1,739
| New | +$81.4K |
|
|
RAL
5960
CALL
Ralliant Corp
RAL
$7.37B
| $83K | ﹤0.01% |
+1,900
| New | +$84.5K |
|
|
CADE
5961
CALL
DELISTED
Cadence Bank
CADE
| $82K | ﹤0.01% |
2,200
-5,300
| -71% | -$191K |
|
5962
CALL
Douglas Emmett
DEI
$2B
| $82K | ﹤0.01% |
5,300
-48,500
| -90% | -$758K |
|
5963
CALL
Ethan Allen Interiors
ETD
$571M
| $82K | ﹤0.01% |
2,800
-1,200
| -30% | -$35.4K |
|
5964
PUT
Golub Capital BDC
GBDC
$3.32B
| $82K | ﹤0.01% |
6,000
+4,400
| +275% | +$64.8K |
|
5965
Idacorp
IDA
$8B
| $82K | ﹤0.01% |
622
+421
| +209% | +$52.1K |
|
5966
CALL
Ituran Location and Control
ITRN
$1.09B
| $82K | ﹤0.01% |
2,300
+300
| +15% | +$11.3K |
|
5967
PUT
KB Financial Group
KB
$41.5B
| $82K | ﹤0.01% |
1,000
+900
| +900% | +$73.8K |
|
|
LAND
5968
PUT
Gladstone Land Corp
LAND
$355M
| $82K | ﹤0.01% |
9,000
-2,500
| -22% | -$23.6K |
|
5969
PUT
QuidelOrtho
QDEL
$1.1B
| $82K | ﹤0.01% |
2,800
+2,500
| +833% | +$68.4K |
|
5970
CALL
SEACOR Marine Holdings
SMHI
$253M
| $82K | ﹤0.01% |
12,700
+11,400
| +877% | +$69.1K |
|
5971
ProShares VIX Mid-Term Futures ETF
VIXM
$56.4M
| $82K | ﹤0.01% |
5,202
+1,413
| +37% | +$23.3K |
|
|
SMC
5972
PUT
Summit Midstream
SMC
$427M
| $82K | ﹤0.01% |
+4,000
| New | +$92.9K |
|
|
FLD
5973
Fold Holdings
FLD
$23.1M
| $82K | ﹤0.01% |
+21,433
| New | +$84.3K |
|
5974
CALL
Agilon Health
AGL
$1.58B
| $81K | ﹤0.01% |
3,152
-480
| -13% | -$18.1K |
|
5975
Federal Agricultural Mortgage
AGM
$2.43B
| $81K | ﹤0.01% |
+488
| New | +$91.4K |
|
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.