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 | |
|---|---|---|---|---|---|---|
5876
CALL
Stereotaxis
STXS
$127M
| $90K | ﹤0.01% |
29,000
+10,900
| +60% | +$28.2K |
|
5877
PUT
Vera Therapeutics
VERA
$2.31B
| $90K | ﹤0.01% |
3,100
-41,700
| -93% | -$964K |
|
|
ZH
5878
Zhihu
ZH
$280M
| $90K | ﹤0.01% |
17,947
-17,635
| -50% | -$83.4K |
|
|
ZENA
5879
ZenaTech Inc
ZENA
$114M
| $90K | ﹤0.01% |
18,761
+690
| +4% | +$3.44K |
|
5880
PUT
Broadstone Net Lease
BNL
$4.11B
| $89K | ﹤0.01% |
5,000
+3,200
| +178% | +$55K |
|
5881
Huazhu Hotels Group
HTHT
$13.1B
| $89K | ﹤0.01% |
2,289
+418
| +22% | +$14.6K |
|
5882
PUT
Jones Lang LaSalle
JLL
$16.6B
| $89K | ﹤0.01% |
300
+100
| +50% | +$28.6K |
|
5883
CALL
St. Joe Company
JOE
$3.51B
| $89K | ﹤0.01% |
1,800
+300
| +20% | +$15.1K |
|
5884
CALL
Oceaneering
OII
$4.86B
| $89K | ﹤0.01% |
3,600
-2,100
| -37% | -$48.2K |
|
5885
CALL
Fidelity Nasdaq Composite Index ETF
ONEQ
$10.3B
| $89K | ﹤0.01% |
1,000
+700
| +233% | +$59.1K |
|
5886
CALL
Rimini Street
RMNI
$436M
| $89K | ﹤0.01% |
19,100
+17,200
| +905% | +$76.4K |
|
5887
Sabre
SABR
$727M
| $89K | ﹤0.01% |
49,060
+31,363
| +177% | +$74K |
|
5888
ZipRecruiter
ZIP
$316M
| $89K | ﹤0.01% |
21,174
+19,778
| +1,417% | +$92.5K |
|
5889
PUT
Ibotta
IBTA
$567M
| $89K | ﹤0.01% |
3,200
+100
| +3% | +$3.13K |
|
|
TOPW
5890
Roundhill Top WeeklyPay ETF
TOPW
$143M
| $89K | ﹤0.01% |
+1,679
| New | +$89.4K |
|
5891
PUT
Arbutus Biopharma
ABUS
$847M
| $88K | ﹤0.01% |
19,600
-9,000
| -31% | -$33.1K |
|
|
AEVA
5892
PUT
Aeva Technologies
AEVA
$1.21B
| $88K | ﹤0.01% |
6,100
-146,600
| -96% | -$2.78M |
|
|
AGEN
5893
Agenus
AGEN
$306M
| $88K | ﹤0.01% |
+23,075
| New | +$116K |
|
|
BLCN
5894
CALL
DELISTED
Siren ETF Trust Siren NexGen Economy ETF
BLCN
| $88K | ﹤0.01% |
3,200
+100
| +3% | +$2.48K |
|
|
BORR
5895
PUT
Borr Drilling
BORR
$1.24B
| $88K | ﹤0.01% |
33,000
+23,400
| +244% | +$58.2K |
|
|
NOAH
5896
CALL
Noah Holdings
NOAH
$579M
| $88K | ﹤0.01% |
7,600
+500
| +7% | +$5.98K |
|
5897
Ocean Power Technologies
OPTT
$50.2M
| $88K | ﹤0.01% |
174,916
-29,600
| -14% | -$16.2K |
|
5898
CALL
Rollins
ROL
$18.1B
| $88K | ﹤0.01% |
1,500
-14,300
| -91% | -$813K |
|
5899
PUT
Simmons First National
SFNC
$3.4B
| $88K | ﹤0.01% |
4,600
-9,100
| -66% | -$182K |
|
5900
CALL
Sasol
SSL
$7.48B
| $88K | ﹤0.01% |
14,300
-2,300
| -14% | -$13.4K |
|
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.