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 | |
|---|---|---|---|---|---|---|
|
AIFC
4926
PUT
AI Financial Corp
AIFC
$52.1M
| $202K | ﹤0.01% |
75,400
+75,100
| +25,033% | +$449K |
|
4927
CALL
Federal Agricultural Mortgage Class A
AGM.A
$1.67B
| $201K | ﹤0.01% |
1,200
-400
| -25% | -$54.1K |
|
4928
Arcturus Therapeutics
ARCT
$168M
| $201K | ﹤0.01% |
10,916
+7,596
| +229% | +$122K |
|
4929
Fortress Biotech
FBIO
$109M
| $201K | ﹤0.01% |
+54,453
| New | +$138K |
|
4930
PUT
Kimbell Royalty Partners
KRP
$1.46B
| $201K | ﹤0.01% |
14,900
+2,300
| +18% | +$32.3K |
|
|
LAND
4931
Gladstone Land Corp
LAND
$357M
| $201K | ﹤0.01% |
21,952
+7,833
| +55% | +$74.1K |
|
4932
Lantronix
LTRX
$239M
| $201K | ﹤0.01% |
44,059
+30,941
| +236% | +$114K |
|
4933
Xperi
XPER
$364M
| $201K | ﹤0.01% |
31,093
+12,621
| +68% | +$83.3K |
|
4934
iShares MSCI Spain ETF
EWP
$2.11B
| $200K | ﹤0.01% |
+4,048
| New | +$190K |
|
4935
PUT
Ovid Therapeutics
OVID
$442M
| $200K | ﹤0.01% |
+154,200
| New | +$134K |
|
|
SNCY
4936
CALL
DELISTED
Sun Country Airlines
SNCY
| $200K | ﹤0.01% |
17,000
-400
| -2% | -$4.95K |
|
4937
AMC Global Media
AMCX
$427M
| $199K | ﹤0.01% |
24,260
-78,745
| -76% | -$546K |
|
4938
Fennec Pharmaceuticals
FENC
$344M
| $199K | ﹤0.01% |
21,270
-1,440
| -6% | -$12.5K |
|
4939
Hartford Financial Services
HIG
$39.2B
| $199K | ﹤0.01% |
1,498
+916
| +157% | +$117K |
|
4940
CALL
Middleby
MIDD
$6.03B
| $199K | ﹤0.01% |
1,500
-13,800
| -90% | -$1.92M |
|
4941
Atlanta Braves Holdings Series B
BATRK
$3.26B
| $198K | ﹤0.01% |
4,761
+3,961
| +495% | +$175K |
|
4942
Kaspi.kz JSC
KSPI
$16.9B
| $198K | ﹤0.01% |
2,427
+1,428
| +143% | +$125K |
|
4943
PUT
Rigel Pharmaceuticals
RIGL
$704M
| $198K | ﹤0.01% |
+7,000
| New | +$209K |
|
|
TUZ
4944
PUT
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $198K | ﹤0.01% |
3,100
-4,600
| -60% | -$294K |
|
4945
CALL
Americold
COLD
$4.13B
| $197K | ﹤0.01% |
16,100
-45,200
| -74% | -$673K |
|
4946
GeoPark
GPRK
$622M
| $197K | ﹤0.01% |
31,055
-31,215
| -50% | -$206K |
|
4947
CALL
Quaker Houghton
KWR
$2.69B
| $197K | ﹤0.01% |
1,500
| – | – |
|
4948
PUT
Grupo Aeroportuario Centro Norte
OMAB
$5.22B
| $197K | ﹤0.01% |
1,900
| – | – |
|
4949
CALL
Robert Half
RHI
$3.81B
| $197K | ﹤0.01% |
5,800
-6,500
| -53% | -$244K |
|
|
AIV
4950
CALL
Aimco
AIV
$383M
| $196K | ﹤0.01% |
24,800
+17,500
| +240% | +$142K |
|
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.